Search

Your search keyword '"Cortesi, U."' showing total 176 results
Start Over Author "Cortesi, U."
176 results on '"Cortesi, U."'

52. Validation of MIPAS N2O profiles by stratospheric balloon, aircraft and ground based measurements

Author

Camy-Peyret, Claude, Dufour, G., Payan, Sébastien, Oelhaf, H., Wetzel, G., Stiller, G., Blumenstock, Th., Blom, C.E., Gulde, T., Glatthor, N., Engel, A., Pirre, Michel, Catoire, Valéry, Moreau, G., Mazière De, M., Vigouroux, C., Mahieu, E., Cortesi, U., Mencaraglia, F., Laboratoire de Physique Moleculaire pour l'Atmosphere et l'Astrophysique (LPMAA), Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS), Institute for Meteorology and Climate Research (IMK), Karlsruhe Institute of Technology (KIT), Institut für Meteorologie und Geophysik [Frankfurt], Goethe-Universität Frankfurt am Main, Laboratoire de physique et chimie de l'environnement (LPCE), Université d'Orléans (UO)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Belgian Institute for Space Aeronomy / Institut d'Aéronomie Spatiale de Belgique (BIRA-IASB), Institut d'Astrophysique et de Géophysique [Liège], Université de Liège, Istituto di Fisica Applicata 'Nello Carrara' (IFAC), Consiglio Nazionale delle Ricerche [Roma] (CNR), Institut national des sciences de l'Univers (INSU - CNRS)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS), and National Research Council of Italy | Consiglio Nazionale delle Ricerche (CNR)

Subjects
[PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph]
Abstract

The ENVISAT validation programme for the atmospheric instruments MIPAS, SCIAMACHY and GOMOS is based on a number of balloon-bone, aircraft and ground-based correlative measurements. In particular the activities of validation scientists were coordinated by ESA within the ENVISAT Stratospheric Aircraft and Balloon Campaign or ESABC. As a companion to a similar paper on CH4 and in parallel to the contribution of the individual validation teams, the present paper provides a synthesis of comparisons performed between MIPAS N2O profiles produced by the current ESA operational software (Instrument Processing Facility version 4.61 or IPF v4.61) or by the IMK-FZK scientific processor and correlative measurements obtained from balloon and aircraft experiments as well as from ground-based instruments.

Published
2004

63. Validation and data characteristics of methane and nitrous oxide profiles observed by MIPAS and processed with Version 4.61 algorithm.

Author

Payan, S., Camy-Peyret, C., Oelhaf, H., Wetzel, G., Maucher, G., Kleim, C., Pirre, M., Huret, N., Engel, Anja, Volk, M. C., Kuellmann, H., Kuttippurath, J., Cortesi, U., Bianchini, G., Mencaraglia, F., Raspollini, P., Redaelli, G., Vigouroux, C., De Maziere, M., Mikuteit, S., Blumenstock, T., Velazco, V., Notholt, Justus, Mahieu, M., Duchatelet, P., Smale, D., Wood, S., Jones, N., Piccolo, C., Payne, V., Bracher, Astrid, Glatthor, N., Stiller, G., Grunow, K., Jeseck, P., Te, Y., Butz, A., Payan, S., Camy-Peyret, C., Oelhaf, H., Wetzel, G., Maucher, G., Kleim, C., Pirre, M., Huret, N., Engel, Anja, Volk, M. C., Kuellmann, H., Kuttippurath, J., Cortesi, U., Bianchini, G., Mencaraglia, F., Raspollini, P., Redaelli, G., Vigouroux, C., De Maziere, M., Mikuteit, S., Blumenstock, T., Velazco, V., Notholt, Justus, Mahieu, M., Duchatelet, P., Smale, D., Wood, S., Jones, N., Piccolo, C., Payne, V., Bracher, Astrid, Glatthor, N., Stiller, G., Grunow, K., Jeseck, P., Te, Y., and Butz, A.

Abstract

The ENVISAT validation programme for the atmospheric instruments MIPAS, SCIAMACHY and GOMOS is based on a number of balloon-borne, aircraft, satellite and ground-based correlative measurements. In particular the activities of validation scientists were coordinated by ESA within the ENVISAT Stratospheric Aircraft and Balloon Campaign or ESABC. As part of a series of similar papers on other species [this issue] and in parallel to the contribution of the individual validation teams, the present paper provides a synthesis of comparisons performed between MIPAS CH4 and N2O profiles produced by the current ESA operational software (Instrument Processing Facility version 4.61 or IPF v4.61, full resolution MIPAS data covering the period 9 July 2002 to 26 March 2004) and correlative measurements obtained from balloon and aircraft experiments as well as from satellite sensors or from ground-based instruments. In the middle stratosphere, no significant bias is observed between MIPAS and correlative measurements, and MIPAS is providing a very consistent and global picture of the distribution of CH4 and N2O in this region. In average, the MIPAS CH4 values show a small positive bias in the lower stratosphere of about 5%. A similar situation is observed for N2O with a positive bias of 4%. In the lower stratosphere/upper troposphere (UT/LS) the individual used MIPAS data version 4.61 still exhibits some unphysical oscillations in individual CH4 and N2O profiles caused by the processing algorithm (with almost no regularization). Taking these problems into account, the MIPAS CH4 and N2O profiles are behaving as expected from the internal error estimation of IPF v4.61 and the estimated errors of the correlative measurements.

Published
2009

64. Validation of ozone measurements from the Atmospheric Chemistry Experiment (ACE)

Author

Burrows, J. P., Christensen, T., Dupuy, E., Walker, K. A., Kar, J., Boone, C. D., McElroy, C. T., Bernath, P. F., Drummond, J. R., Skelton, R., McLeod, S. D., Hughes, R. C., Nowlan, C. R., Dufour, D. G., Zou, J., Nichitiu, F., Strong, K., Baron, P., Bevilacqua, R. M., Blumenstock, T., Bodeker, G. E., Borsdorff, T., Bourassa, A. E., Bovensmann, H., Boyd, I. S., Bracher, Astrid, Brogniez, C., Catoire, V., Ceccherini, S., Chabrillat, S., Coffey, M. T., Cortesi, U., Davies, J., De Clercq, C., Degenstein, D. A., De Maziere, M., Demoulin, P., Dodion, J., Firanski, B., Fischer, Hubertus, Forbes, G., Froidevaux, L., Fussen, D., Gerard, P., Godin-Beekmann, S., Goutail, F., Granville, J., Griffith, D., Haley, C. S., Hannigan, J. W., Höpfner, M., Jin, J. J., Jones, A., Jones, N. B., Jucks, K., Kagawa, A., Kasai, Y., Kerzenmacher, T. E., Kleinböhl, A., Klekociuk, A. R., Kramer, I., Küllmann, H., Kuttippurath, J., Kyrölä, E., Lambert, J. C., Livesey, N. J., Llewellyn, E. J., Lloyd, N. D., Mahieu, E., Manney, G. L., Marshall, B. T., McConnell, J. C., McCormick, M. P., McDermid, I. S., McHugh, M., McLinden, C. A., Mellqvist, J., Mizutani, K., Murayama, Y., Murtagh, D. P., Oelhaf, H., Parrish, A., Petelina, S. V., Piccolo, C., Pommereau, J.-P., Randall, C. E., Robert, C., Roth, C., Russell III, J. M., Schneider, M., Senten, C., Steck, T., Strandberg, A., Strawbridge, K. B., Sussmann, R., Swart, D. P. J., Tarasick, D. W., Taylor, James, Tétard, C., Thomason, L. W., Thompson, A. M., Tully, M. B., Urban, J., Vanhellemont, F., von Clarmann, T., von der Gathen, Peter, von Savigny, C., Waters, J. W., Witte, J. C., Wolff, Martha Maria, Zawodny, J. M., Burrows, J. P., Christensen, T., Dupuy, E., Walker, K. A., Kar, J., Boone, C. D., McElroy, C. T., Bernath, P. F., Drummond, J. R., Skelton, R., McLeod, S. D., Hughes, R. C., Nowlan, C. R., Dufour, D. G., Zou, J., Nichitiu, F., Strong, K., Baron, P., Bevilacqua, R. M., Blumenstock, T., Bodeker, G. E., Borsdorff, T., Bourassa, A. E., Bovensmann, H., Boyd, I. S., Bracher, Astrid, Brogniez, C., Catoire, V., Ceccherini, S., Chabrillat, S., Coffey, M. T., Cortesi, U., Davies, J., De Clercq, C., Degenstein, D. A., De Maziere, M., Demoulin, P., Dodion, J., Firanski, B., Fischer, Hubertus, Forbes, G., Froidevaux, L., Fussen, D., Gerard, P., Godin-Beekmann, S., Goutail, F., Granville, J., Griffith, D., Haley, C. S., Hannigan, J. W., Höpfner, M., Jin, J. J., Jones, A., Jones, N. B., Jucks, K., Kagawa, A., Kasai, Y., Kerzenmacher, T. E., Kleinböhl, A., Klekociuk, A. R., Kramer, I., Küllmann, H., Kuttippurath, J., Kyrölä, E., Lambert, J. C., Livesey, N. J., Llewellyn, E. J., Lloyd, N. D., Mahieu, E., Manney, G. L., Marshall, B. T., McConnell, J. C., McCormick, M. P., McDermid, I. S., McHugh, M., McLinden, C. A., Mellqvist, J., Mizutani, K., Murayama, Y., Murtagh, D. P., Oelhaf, H., Parrish, A., Petelina, S. V., Piccolo, C., Pommereau, J.-P., Randall, C. E., Robert, C., Roth, C., Russell III, J. M., Schneider, M., Senten, C., Steck, T., Strandberg, A., Strawbridge, K. B., Sussmann, R., Swart, D. P. J., Tarasick, D. W., Taylor, James, Tétard, C., Thomason, L. W., Thompson, A. M., Tully, M. B., Urban, J., Vanhellemont, F., von Clarmann, T., von der Gathen, Peter, von Savigny, C., Waters, J. W., Witte, J. C., Wolff, Martha Maria, and Zawodny, J. M.

Abstract

This paper presents extensive {bias determination} analyses of ozone observations from the Atmospheric Chemistry Experiment (ACE) satellite instruments: the ACE Fourier Transform Spectrometer (ACE-FTS) and the Measurement of Aerosol Extinction in the Stratosphere and Troposphere Retrieved by Occultation (ACE-MAESTRO) instrument. Here we compare the latest ozone data products from ACE-FTS and ACE-MAESTRO with coincident observations from nearly 20 satellite-borne, airborne, balloon-borne and ground-based instruments, by analysing volume mixing ratio profiles and partial column densities. The ACE-FTS version 2.2 Ozone Update product reports more ozone than most correlative measurements from the upper troposphere to the lower mesosphere. At altitude levels from 16 to 44 km, the average values of the mean relative differences are nearly all within +1 to +8%. At higher altitudes (4560 km), the ACE-FTS ozone amounts are significantly larger than those of the comparison instruments, with mean relative differences of up to +40% (about +20% on average). For the ACE-MAESTRO version 1.2 ozone data product, mean relative differences are within ±10% (average values within ±6%) between 18 and 40 km for both the sunrise and sunset measurements. At higher altitudes (~3555 km), systematic biases of opposite sign are found between the ACE-MAESTRO sunrise and sunset observations. While ozone amounts derived from the ACE-MAESTRO sunrise occultation data are often smaller than the coincident observations (with mean relative differences down to −10%), the sunset occultation profiles for ACE-MAESTRO show results that are qualitatively similar to ACE-FTS, indicating a large positive bias (mean relative differences within +10 to +30%) in the 4555 km altitude range. In contrast, there is no significant systematic difference in bias found for the ACE-FTS sunrise and sunset measurements.

Published
2009

65. Validation of version-4.61 methane and nitrous oxide observed by MIPAS

Author

Payan, S, Camy-Peyret, C, Oelhaf, H, Wetzel, G, Maucher, G, Keim, C, Pirre, M, Huret, N, Engel, A, Volk, M C, Kuellmann, H, Kuttippurath, J, Cortesi, U, Bianchini, G, Mencaraglia, F, Raspollini, P, Redaelli, G, Vigouroux, C, De Maziere, M, Mikuteit, S, Blumenstock, T, Velazco, Voltaire A, Notholt, J, Mahieu, E, Duchatelet, P, Smale, D, Wood, S, Jones, N, Piccolo, C, Payne, V, Bracher, A, Glatthor, N, Stiller, G P, Grunow, K, Jeseck, P, Te, Y, Butz, A, Payan, S, Camy-Peyret, C, Oelhaf, H, Wetzel, G, Maucher, G, Keim, C, Pirre, M, Huret, N, Engel, A, Volk, M C, Kuellmann, H, Kuttippurath, J, Cortesi, U, Bianchini, G, Mencaraglia, F, Raspollini, P, Redaelli, G, Vigouroux, C, De Maziere, M, Mikuteit, S, Blumenstock, T, Velazco, Voltaire A, Notholt, J, Mahieu, E, Duchatelet, P, Smale, D, Wood, S, Jones, N, Piccolo, C, Payne, V, Bracher, A, Glatthor, N, Stiller, G P, Grunow, K, Jeseck, P, Te, Y, and Butz, A

Abstract

The ENVISAT validation programme for the atmospheric instruments MIPAS, SCIAMACHY and GOMOS is based on a number of balloon-borne, aircraft, satellite and ground-based correlative measurements. In particular the activities of validation scientists were coordinated by ESA within the ENVISAT Stratospheric Aircraft and Balloon Campaign or ESABC.

Published
2009

66. Validation of version-4.61 methane and nitrous oxide observed by MIPAS

Author

Payan, S., Camy-Peyret, C., Oelhaf, H., Wetzel, G., Maucher, G., Keim, C., Pirre, M., Huret, N., Engel, Anja, Volk, M. C., Kuellmann, H., Kuttippurath, J., Cortesi, U., Bianchini, G., Mencaraglia, F., Raspollini, P., Redaelli, G., Vigouroux, C., De Mazière, M., Mikuteit, S., Blumenstock, T., Velazco, V., Notholt, J., Mahieu, E., Duchatelet, P., Smale, D., Wood, S., Jones, N., Piccolo, C., Payne, V., Bracher, A., Glatthor, N., Stiller, G., Grunow, K., Jeseck, P., Te, Y., Butz, A., Payan, S., Camy-Peyret, C., Oelhaf, H., Wetzel, G., Maucher, G., Keim, C., Pirre, M., Huret, N., Engel, Anja, Volk, M. C., Kuellmann, H., Kuttippurath, J., Cortesi, U., Bianchini, G., Mencaraglia, F., Raspollini, P., Redaelli, G., Vigouroux, C., De Mazière, M., Mikuteit, S., Blumenstock, T., Velazco, V., Notholt, J., Mahieu, E., Duchatelet, P., Smale, D., Wood, S., Jones, N., Piccolo, C., Payne, V., Bracher, A., Glatthor, N., Stiller, G., Grunow, K., Jeseck, P., Te, Y., and Butz, A.

Abstract

The ENVISAT validation programme for the atmospheric instruments MIPAS, SCIAMACHY and GOMOS is based on a number of balloon-borne, aircraft, satellite and ground-based correlative measurements. In particular the activities of validation scientists were coordinated by ESA within the ENVISAT Stratospheric Aircraft and Balloon Campaign or ESABC. As part of a series of similar papers on other species [this issue] and in parallel to the contribution of the individual validation teams, the present paper provides a synthesis of comparisons performed between MIPAS CH4 and N2O profiles produced by the current ESA operational software (Instrument Processing Facility version 4.61 or IPF v4.61, full resolution MIPAS data covering the period 9 July 2002 to 26 March 2004) and correlative measurements obtained from balloon and aircraft experiments as well as from satellite sensors or from ground-based instruments. In the middle stratosphere, no significant bias is observed between MIPAS and correlative measurements, and MIPAS is providing a very consistent and global picture of the distribution of CH4 and N2O in this region. In average, the MIPAS CH4 values show a small positive bias in the lower stratosphere of about 5%. A similar situation is observed for N2O with a positive bias of 4%. In the lower stratosphere/upper troposphere (UT/LS) the individual used MIPAS data version 4.61 still exhibits some unphysical oscillations in individual CH4 and N2O profiles caused by the processing algorithm (with almost no regularization). Taking these problems into account, the MIPAS CH4 and N2O profiles are behaving as expected from the internal error estimation of IPF v4.61 and the estimated errors of the correlative measurements.

Published
2009
Full Text
View/download PDF

67. Validation of ozone measurements from the Atmospheric Chemistry Experiment (ACE)

Author

Jones, Nicholas B, Griffith, David W, Wolff, M, Mahieu, E, Bodeker, G, Boyd, I, De Maziere, M, Demoulin, P, Blumenstock, T, Murayama, Y., Kagawa, A., Jin, J, McElroy, Christopher, Hannigan, J, Coffey, M, Hopfner, M, Fischer, H W, Kerzenmacher, T, Kramer, I, Mellqvist, J, Sussmann, R, Strong, K, Taylor, J R, Mizutani, K, Kasai, Y, Urban, J, Murtagh, D, Dupuy, E, Catoire, V, Chabrillat, S, Baron, P, Brogniez, C, Manney, G L, Piccolo, C, Randall, C, Robert, C, Senten, C, Tetard, C, Livesey, N J, Kleinbohl, A, Godin-Beekmann, S, Borsdorff, T, Drummond, James, De Clercq, C, Lambert, J C, Cortesi, U, Jucks, K W, Boone, C, Oelhaf, H, Schneider, M, Steck, T, Walker, K A, Bernath, P, von Clarmann, T, Hughes, R, Vigouroux, C, Kuttippurath, J, Bracher, A, McConnell, J, McLinden, C, Kullmann, H, Froidevaux, L, Dodion, J, Vanhellemont, F, Burrows, J P, kar, J, Goutail, F, Dufour, D G, Zawodny, J M, Nichitiu, F, Pommereau, J-P, Nowlan, C, Fussen, D, Zou, J, Klekociuk, A R, Forbes, G, Bovensmann, H, Bevilacqua, R M, Haley, C, Ceccherini, S, McLeod, S D, Gerard, P, Skelton, R, Firanski, B, Bourassa, A E, Degenstein, D A, Davies, J, Christensen, T, Granville, J, Parrish, A, Roth, C, Waters, J W, von Savigny, C, Standberg, A, McHugh, M, Thompson, A M, Llewellyn, E J, von der Gathen, P, Tully, M B, Witte, J C, Marshall, B T, Strawbridge, K B, Kyrola, E, McCormick, M P, Swart, D P J, Lloyd, N D, Tarasick, D W, Petelina, S V, Thomason, L W, Jones, A, McDermid, I S, Jones, Nicholas B, Griffith, David W, Wolff, M, Mahieu, E, Bodeker, G, Boyd, I, De Maziere, M, Demoulin, P, Blumenstock, T, Murayama, Y., Kagawa, A., Jin, J, McElroy, Christopher, Hannigan, J, Coffey, M, Hopfner, M, Fischer, H W, Kerzenmacher, T, Kramer, I, Mellqvist, J, Sussmann, R, Strong, K, Taylor, J R, Mizutani, K, Kasai, Y, Urban, J, Murtagh, D, Dupuy, E, Catoire, V, Chabrillat, S, Baron, P, Brogniez, C, Manney, G L, Piccolo, C, Randall, C, Robert, C, Senten, C, Tetard, C, Livesey, N J, Kleinbohl, A, Godin-Beekmann, S, Borsdorff, T, Drummond, James, De Clercq, C, Lambert, J C, Cortesi, U, Jucks, K W, Boone, C, Oelhaf, H, Schneider, M, Steck, T, Walker, K A, Bernath, P, von Clarmann, T, Hughes, R, Vigouroux, C, Kuttippurath, J, Bracher, A, McConnell, J, McLinden, C, Kullmann, H, Froidevaux, L, Dodion, J, Vanhellemont, F, Burrows, J P, kar, J, Goutail, F, Dufour, D G, Zawodny, J M, Nichitiu, F, Pommereau, J-P, Nowlan, C, Fussen, D, Zou, J, Klekociuk, A R, Forbes, G, Bovensmann, H, Bevilacqua, R M, Haley, C, Ceccherini, S, McLeod, S D, Gerard, P, Skelton, R, Firanski, B, Bourassa, A E, Degenstein, D A, Davies, J, Christensen, T, Granville, J, Parrish, A, Roth, C, Waters, J W, von Savigny, C, Standberg, A, McHugh, M, Thompson, A M, Llewellyn, E J, von der Gathen, P, Tully, M B, Witte, J C, Marshall, B T, Strawbridge, K B, Kyrola, E, McCormick, M P, Swart, D P J, Lloyd, N D, Tarasick, D W, Petelina, S V, Thomason, L W, Jones, A, and McDermid, I S

Abstract

This paper presents extensive bias determination analyses of ozone observations from the Atmospheric Chemistry Experiment (ACE) satellite instruments: the ACE Fourier Transform Spectrometer (ACE-FTS) and the Measurement of Aerosol Extinction in the Stratosphere and Troposphere Retrieved by Occultation (ACE-MAESTRO) instrument. Here we compare the latest ozone data products from ACE-FTS and ACE-MAESTRO with coincident observations from nearly 20 satellite-borne, airborne, balloonborne and ground-based instruments, by analysing volume mixing ratio profiles and partial column densities. The ACEFTS version 2.2 Ozone Update product reports more ozone than most correlative measurements from the upper troposphere to the lower mesosphere. At altitude levels from 16 to 44 km, the average values of the mean relative differences are nearly all within +1 to +8%. At higher altitudes (45¿60 km), the ACE-FTS ozone amounts are significantly larger than those of the comparison instruments, with mean relative differences of up to +40% (about +20% on average). For the ACE-MAESTRO version 1.2 ozone data product, mean relative differences are within +10% (average values within +6%) between 18 and 40 km for both the sunrise and sunset measurements. At higher altitudes (35¿55 km), systematic biases of opposite sign are found between the ACEMAESTRO sunrise and sunset observations. While ozone amounts derived from the ACE-MAESTRO sunrise occultation data are often smaller than the coincident observations (with mean relative differences down to ¿10%), the sunset occultation profiles for ACE-MAESTRO show results that are qualitatively similar to ACE-FTS, indicating a large positive bias (mean relative differences within +10 to +30%) in the 45¿55 km altitude range. In contrast, there is no significant systematic difference in bias found for the ACE-FTS sunrise and sunset measurements.

Published
2009

70. Validation of MIPAS HNO3 operational data

Author

Wang, D Y, Hopfner, M, Blom, C E, Ward, W E, Jones, Nicholas B, Toon, G C, Mahieu, E, Wood, S, De Maziere, M, Demoulin, P, Blumenstock, T, Hase, F, Fischer, H W, Smale, D, Bianchini, G, Redaelli, G, Mencaraglia, F, Urban, J, Murtagh, D, Pirre, M, Catoire, V, Huret, N, Nakajima, H, Piccolo, C, Sugita, T, Kleinbohl, A, Cortesi, U, Boone, C, Oelhaf, H, Keim, C, Liu, G Y, Wetzel, G, Mikuteit, S, Walker, K A, Bernath, P, Vigouroux, C, Kuttippurath, J, Wang, D Y, Hopfner, M, Blom, C E, Ward, W E, Jones, Nicholas B, Toon, G C, Mahieu, E, Wood, S, De Maziere, M, Demoulin, P, Blumenstock, T, Hase, F, Fischer, H W, Smale, D, Bianchini, G, Redaelli, G, Mencaraglia, F, Urban, J, Murtagh, D, Pirre, M, Catoire, V, Huret, N, Nakajima, H, Piccolo, C, Sugita, T, Kleinbohl, A, Cortesi, U, Boone, C, Oelhaf, H, Keim, C, Liu, G Y, Wetzel, G, Mikuteit, S, Walker, K A, Bernath, P, Vigouroux, C, and Kuttippurath, J

Abstract

Nitric acid (HNO3) is one of the key products that are operationally retrieved by the European Space Agency (ESA) from the emission spectra measured by the Michelson Interferometer for Passive Atmospheric Sounding (MIPAS) onboard ENVISAT. The product version 4.61/4.62 for the observation period between July 2002 and March 2004 is validated by comparisons with a number of independent observations from ground-based stations, aircraft/balloon campaigns, and satellites. Individual HNO3 profiles of the ESA MIPAS level-2 product show good agreement with those of MIPAS-B and MIPAS-STR (the balloon and aircraft version of MIPAS, respectively), and the balloon-borne infrared spectrometers MkIV and SPIRALE, mostly matching the reference data within the combined instrument error bars. In most cases differences between the correlative measurement pairs are less than 1 ppbv (510%) throughout the entire altitude range up to about 38 km (~6 hPa), and below 0.5 ppbv (1520% or more) above 30 km (~17 hPa). However, differences up to 4 ppbv compared to MkIV have been found at high latitudes in December 2002 in the presence of polar stratospheric clouds. The degree of consistency is further largely affected by the temporal and spatial coincidence, and differences of 2 ppbv may be observed between 22 and 26 km (~50 and 30 hPa) at high latitudes near the vortex boundary, due to large horizontal inhomogeneity of HNO3. Similar features are also observed in the mean differences of the MIPAS ESA HNO3 VMRs with respect to the ground-based FTIR measurements at five stations, aircraft-based SAFIRE-A and ASUR, and the balloon campaign IBEX. The mean relative differences between the MIPAS and FTIR HNO3 partial columns are within +2%, comparable to the MIPAS systematic error of ~2%. For the vertical profiles, the biases between the MIPAS and FTIR data are generally below 10% in the altitudes of 10 to 30 km. The MIPAS and SAFIRE HNO3 data generally match within their total error bars for the mid an

Published
2007

71. Geophysical validation of MIPAS-ENVISAT operational ozone data

Author

Cortesi, U, Lambert, J C, De Clercq, C, Bianchini, G., Blumenstock, T, Bracher, A., Castelli, E., Catoire, V., Chance, K. V., De Maziere, M., Demoulin, P., Godin-Beekmann, S., Jones, N. B., Jucks, K., Keim, C., Kerzenmacher, T., Kuellmann, H., Kuttippurath, J., Iarlori, M., Liu, G. Y., Liu, Y., McDermid, I. S., Meijer, Y. J., Mencaraglia, F., Mikuteit, S., Oelhaf, H., Piccolo, C., Pirre, M., Raspollini, P., Ravegnani, F., Reburn, W. J., Redaelli, G., Remedios, J. J., Sembhi, H., Smale, D., Steck, T., Taddei, A., Varotsos, C., Vigouroux, C., Waterfall, A., Wetzel, G., Wood, S., Cortesi, U, Lambert, J C, De Clercq, C, Bianchini, G., Blumenstock, T, Bracher, A., Castelli, E., Catoire, V., Chance, K. V., De Maziere, M., Demoulin, P., Godin-Beekmann, S., Jones, N. B., Jucks, K., Keim, C., Kerzenmacher, T., Kuellmann, H., Kuttippurath, J., Iarlori, M., Liu, G. Y., Liu, Y., McDermid, I. S., Meijer, Y. J., Mencaraglia, F., Mikuteit, S., Oelhaf, H., Piccolo, C., Pirre, M., Raspollini, P., Ravegnani, F., Reburn, W. J., Redaelli, G., Remedios, J. J., Sembhi, H., Smale, D., Steck, T., Taddei, A., Varotsos, C., Vigouroux, C., Waterfall, A., Wetzel, G., and Wood, S.

Abstract

The Michelson Interferometer for Passive Atmospheric Sounding (MIPAS), on-board the European ENVIronmental SATellite (ENVISAT) launched on 1 March 2002, is a middle infrared Fourier Transform spectrometer measuring the atmospheric emission spectrum in limb sounding geometry. The instrument is capable to retrieve the vertical distribution of temperature and trace gases, aiming at the study of climate and atmospheric chemistry and dynamics, and at applications to data assimilation and weather forecasting.

Published
2007

72. Validation and data characteristics of methane and nitrous oxide profiles observed by MIPAS and processed with Version 4.61 algorithm

Author

Payan, S, Camy-Peyret, C, Oelhaf, H, Wetzel, G, Maucher, G, Jones, Nicholas B, Wood, S, De Maziere, M, Blumenstock, T, Duchatelet, P, Smale, D, Bianchini, G, Redaelli, G, Mencaraglia, F, Pirre, M, Huret, N, Piccolo, C, Cortesi, U, Keim, C, Glatthor, N, Mikuteit, S, Stiller, G P, Vigouroux, C, Engel, A, Volk, M C, Kuttippurath, J, Kuellmann, H, Raspollini, P, Mahieu, M, Payne, V, Bracher, A, Grunow, K, Jeseck, P, Te, Y, Pfeilsticker, K, Butz, A, Notholt, Justus, Velazco, Voltaire A, Payan, S, Camy-Peyret, C, Oelhaf, H, Wetzel, G, Maucher, G, Jones, Nicholas B, Wood, S, De Maziere, M, Blumenstock, T, Duchatelet, P, Smale, D, Bianchini, G, Redaelli, G, Mencaraglia, F, Pirre, M, Huret, N, Piccolo, C, Cortesi, U, Keim, C, Glatthor, N, Mikuteit, S, Stiller, G P, Vigouroux, C, Engel, A, Volk, M C, Kuttippurath, J, Kuellmann, H, Raspollini, P, Mahieu, M, Payne, V, Bracher, A, Grunow, K, Jeseck, P, Te, Y, Pfeilsticker, K, Butz, A, Notholt, Justus, and Velazco, Voltaire A

Abstract

The ENVISAT validation programme for the atmospheric instruments MIPAS, SCIAMACHY and GOMOS is based on a number of balloon-bone, aircraft and ground-based correlative measurements. In particular the activities of validation scientists were coordinated by ESA within the ENVISAT Stratospheric Aircraft and Balloon Campaign of ESABC. As part of a series of similar papers on other species [this issue] and in parallel to the contribution of the individual validation teams, the present paper provides a synthesis of comparisons performed between MIPAS CH4 and N2O profiles produced by the current ESA operational software (Instrument Processing Facility version 4.61 or IPF v4.61) and correlative measurements obtained from balloon and aircraft experiments as well as from satellite sensors or from ground-based instruments. The MIPAS-E CH4 values show a positive bias in the lower stratosphere of about 10%. In case of N2O no systematic deviation with respect to the validation experiments could be identified. The individual used MIPAS data version 4.61 still exhibits some unphysical oscillations in individual CH4 and N2O profiles caused by the processing algorithm (with almost no regularization). Taking these problems into account, the MIPAS CH4 and N2O profiles are behaving as expected from the internal error estimation of IPF v4.61.

Published
2007

75. Validation of version-4.61 methane and nitrous oxide observed by MIPAS

Author

Payan, S., primary, Camy-Peyret, C., additional, Oelhaf, H., additional, Wetzel, G., additional, Maucher, G., additional, Keim, C., additional, Pirre, M., additional, Huret, N., additional, Engel, A., additional, Volk, M. C., additional, Kuellmann, H., additional, Kuttippurath, J., additional, Cortesi, U., additional, Bianchini, G., additional, Mencaraglia, F., additional, Raspollini, P., additional, Redaelli, G., additional, Vigouroux, C., additional, De Mazière, M., additional, Mikuteit, S., additional, Blumenstock, T., additional, Velazco, V., additional, Notholt, J., additional, Mahieu, E., additional, Duchatelet, P., additional, Smale, D., additional, Wood, S., additional, Jones, N., additional, Piccolo, C., additional, Payne, V., additional, Bracher, A., additional, Glatthor, N., additional, Stiller, G., additional, Grunow, K., additional, Jeseck, P., additional, Te, Y., additional, and Butz, A., additional

Published
2009
Full Text
View/download PDF

76. Validation of ozone measurements from the Atmospheric Chemistry Experiment (ACE)

Author

Dupuy, E., primary, Walker, K. A., additional, Kar, J., additional, Boone, C. D., additional, McElroy, C. T., additional, Bernath, P. F., additional, Drummond, J. R., additional, Skelton, R., additional, McLeod, S. D., additional, Hughes, R. C., additional, Nowlan, C. R., additional, Dufour, D. G., additional, Zou, J., additional, Nichitiu, F., additional, Strong, K., additional, Baron, P., additional, Bevilacqua, R. M., additional, Blumenstock, T., additional, Bodeker, G. E., additional, Borsdorff, T., additional, Bourassa, A. E., additional, Bovensmann, H., additional, Boyd, I. S., additional, Bracher, A., additional, Brogniez, C., additional, Burrows, J. P., additional, Catoire, V., additional, Ceccherini, S., additional, Chabrillat, S., additional, Christensen, T., additional, Coffey, M. T., additional, Cortesi, U., additional, Davies, J., additional, De Clercq, C., additional, Degenstein, D. A., additional, De Mazière, M., additional, Demoulin, P., additional, Dodion, J., additional, Firanski, B., additional, Fischer, H., additional, Forbes, G., additional, Froidevaux, L., additional, Fussen, D., additional, Gerard, P., additional, Godin-Beekmann, S., additional, Goutail, F., additional, Granville, J., additional, Griffith, D., additional, Haley, C. S., additional, Hannigan, J. W., additional, Höpfner, M., additional, Jin, J. J., additional, Jones, A., additional, Jones, N. B., additional, Jucks, K., additional, Kagawa, A., additional, Kasai, Y., additional, Kerzenmacher, T. E., additional, Kleinböhl, A., additional, Klekociuk, A. R., additional, Kramer, I., additional, Küllmann, H., additional, Kuttippurath, J., additional, Kyrölä, E., additional, Lambert, J.-C., additional, Livesey, N. J., additional, Llewellyn, E. J., additional, Lloyd, N. D., additional, Mahieu, E., additional, Manney, G. L., additional, Marshall, B. T., additional, McConnell, J. C., additional, McCormick, M. P., additional, McDermid, I. S., additional, McHugh, M., additional, McLinden, C. A., additional, Mellqvist, J., additional, Mizutani, K., additional, Murayama, Y., additional, Murtagh, D. P., additional, Oelhaf, H., additional, Parrish, A., additional, Petelina, S. V., additional, Piccolo, C., additional, Pommereau, J.-P., additional, Randall, C. E., additional, Robert, C., additional, Roth, C., additional, Schneider, M., additional, Senten, C., additional, Steck, T., additional, Strandberg, A., additional, Strawbridge, K. B., additional, Sussmann, R., additional, Swart, D. P. J., additional, Tarasick, D. W., additional, Taylor, J. R., additional, Tétard, C., additional, Thomason, L. W., additional, Thompson, A. M., additional, Tully, M. B., additional, Urban, J., additional, Vanhellemont, F., additional, Vigouroux, C., additional, von Clarmann, T., additional, von der Gathen, P., additional, von Savigny, C., additional, Waters, J. W., additional, Witte, J. C., additional, Wolff, M., additional, and Zawodny, J. M., additional

Published
2009
Full Text
View/download PDF

79. Validation of ozone measurements from the Atmospheric Chemistry Experiment (ACE)

Author

Dupuy, E., primary, Walker, K. A., additional, Kar, J., additional, Boone, C. D., additional, McElroy, C. T., additional, Bernath, P. F., additional, Drummond, J. R., additional, Skelton, R., additional, McLeod, S. D., additional, Hughes, R. C., additional, Nowlan, C. R., additional, Dufour, D. G., additional, Zou, J., additional, Nichitiu, F., additional, Strong, K., additional, Baron, P., additional, Bevilacqua, R. M., additional, Blumenstock, T., additional, Bodeker, G. E., additional, Borsdorff, T., additional, Bourassa, A. E., additional, Bovensmann, H., additional, Boyd, I. S., additional, Bracher, A., additional, Brogniez, C., additional, Burrows, J. P., additional, Catoire, V., additional, Ceccherini, S., additional, Chabrillat, S., additional, Christensen, T., additional, Coffey, M. T., additional, Cortesi, U., additional, Davies, J., additional, De Clercq, C., additional, Degenstein, D. A., additional, De Mazière, M., additional, Demoulin, P., additional, Dodion, J., additional, Firanski, B., additional, Fischer, H., additional, Forbes, G., additional, Froidevaux, L., additional, Fussen, D., additional, Gerard, P., additional, Godin-Beekman, S., additional, Goutail, F., additional, Granville, J., additional, Griffith, D., additional, Haley, C. S., additional, Hannigan, J. W., additional, Höpfner, M., additional, Jin, J. J., additional, Jones, A., additional, Jones, N. B., additional, Jucks, K., additional, Kagawa, A., additional, Kasai, Y., additional, Kerzenmacher, T. E., additional, Kleinböhl, A., additional, Klekociuk, A. R., additional, Kramer, I., additional, Küllmann, H., additional, Kuttippurath, J., additional, Kyrölä, E., additional, Lambert, J.-C., additional, Livesey, N. J., additional, Llewellyn, E. J., additional, Lloyd, N. D., additional, Mahieu, E., additional, Manney, G. L., additional, Marshall, B. T., additional, McConnell, J. C., additional, McCormick, M. P., additional, McDermid, I. S., additional, McHugh, M., additional, McLinden, C. A., additional, Mellqvist, J., additional, Mizutani, K., additional, Murayama, Y., additional, Murtagh, D. P., additional, Oelhaf, H., additional, Parrish, A., additional, Petelina, S. V., additional, Piccolo, C., additional, Pommereau, J.-P., additional, Randall, C. E., additional, Robert, C., additional, Roth, C., additional, Schneider, M., additional, Senten, C., additional, Steck, T., additional, Strandberg, A., additional, Strawbridge, K. B., additional, Sussmann, R., additional, Swart, D. P. J., additional, Tarasick, D. W., additional, Taylor, J. R., additional, Tétard, C., additional, Thomason, L. W., additional, Thompson, A. M., additional, Tully, M. B., additional, Urban, J., additional, Vanhellemont, F., additional, von Clarmann, T., additional, von der Gathen, P., additional, von Savigny, C., additional, Waters, J. W., additional, Witte, J. C., additional, Wolff, M., additional, and Zawodny, J. M., additional

Published
2008
Full Text
View/download PDF

81. Validation and data characteristics of methane and nitrous oxide profiles observed by MIPAS and processed with Version 4.61 algorithm

Author

Payan, S., primary, Camy-Peyret, C., additional, Oelhaf, H., additional, Wetzel, G., additional, Maucher, G., additional, Keim, C., additional, Pirre, M., additional, Huret, N., additional, Engel, A., additional, Volk, M. C., additional, Kuellmann, H., additional, Kuttippurath, J., additional, Cortesi, U., additional, Bianchini, G., additional, Mencaraglia, F., additional, Raspollini, P., additional, Redaelli, G., additional, Vigouroux, C., additional, De Mazière, M., additional, Mikuteit, S., additional, Blumenstock, T., additional, Velazco, V., additional, Notholt, J., additional, Mahieu, M., additional, Duchatelet, P., additional, Smale, D., additional, Wood, S., additional, Jones, N., additional, Piccolo, C., additional, Payne, V., additional, Bracher, A., additional, Glatthor, N., additional, Stiller, G., additional, Grunow, K., additional, Jeseck, P., additional, Te, Y., additional, Pfeilsticker, K., additional, and Butz, A., additional

Published
2007
Full Text
View/download PDF

83. Validation of MIPAS HNO<sub>3</sub> operational data

Author

Wang, D. Y., primary, Höpfner, M., additional, Blom, C. E., additional, Ward, W. E., additional, Fischer, H., additional, Blumenstock, T., additional, Hase, F., additional, Keim, C., additional, Liu, G. Y., additional, Mikuteit, S., additional, Oelhaf, H., additional, Wetzel, G., additional, Cortesi, U., additional, Mencaraglia, F., additional, Bianchini, G., additional, Redaelli, G., additional, Pirre, M., additional, Catoire, V., additional, Huret, N., additional, Vigouroux, C., additional, De Mazière, M., additional, Mahieu, E., additional, Demoulin, P., additional, Wood, S., additional, Smale, D., additional, Jones, N., additional, Nakajima, H., additional, Sugita, T., additional, Urban, J., additional, Murtagh, D., additional, Boone, C. D., additional, Bernath, P. F., additional, Walker, K. A., additional, Kuttippurath, J., additional, Kleinböhl, A., additional, Toon, G., additional, and Piccolo, C., additional

Published
2007
Full Text
View/download PDF

84. Geophysical validation of MIPAS-ENVISAT operational ozone data

Author

Cortesi, U., primary, Lambert, J. C., additional, De Clercq, C., additional, Bianchini, G., additional, Blumenstock, T., additional, Bracher, A., additional, Castelli, E., additional, Catoire, V., additional, Chance, K. V., additional, De Mazière, M., additional, Demoulin, P., additional, Godin-Beekmann, S., additional, Jones, N., additional, Jucks, K., additional, Keim, C., additional, Kerzenmacher, T., additional, Kuellmann, H., additional, Kuttippurath, J., additional, Iarlori, M., additional, Liu, G. Y., additional, Liu, Y., additional, McDermid, I. S., additional, Meijer, Y. J., additional, Mencaraglia, F., additional, Mikuteit, S., additional, Oelhaf, H., additional, Piccolo, C., additional, Pirre, M., additional, Raspollini, P., additional, Ravegnani, F., additional, Reburn, W. J., additional, Redaelli, G., additional, Remedios, J. J., additional, Sembhi, H., additional, Smale, D., additional, Steck, T., additional, Taddei, A., additional, Varotsos, C., additional, Vigouroux, C., additional, Waterfall, A., additional, Wetzel, G., additional, and Wood, S., additional

Published
2007
Full Text
View/download PDF

85. Synergy between middle infrared and millimetre-wave limb sounding of atmospheric temperature and minor constituents.

Author

Cortesi, U., Del Bianco, S., Ceccherini, S., Gai, M., Dinelli, B. M., Castelli, E., Oelhaf, H., Woiwode, W., Höpfner, M., and Gerber, D.

Subjects
*INFRARED radiation, *ATMOSPHERIC temperature
Abstract

Synergistic exploitation of redundant and complementary information from independent observations of the same target remains a major issue in atmospheric remote-sounding and increasing attention is devoted to investigate optimised or innovative methods for the combination of two or more measured data sets. This paper is focusing on the synergy between middle infrared and millimetre-wave limb sounding measurements of atmospheric composition and temperature and reports the results of a study conducted as part of the preparatory activities of the PREMIER (Process Exploration through Measurements of Infrared and millimetre wave Emitted Radiation) mission candidate to the Core Missions of ESA Earth Explorer 7. The activity was based on data acquired by the MIPAS-STR (Michelson Interferometer for Passive Atmospheric Sounding - STRato-spheric aircraft) and MARSCHALS (Millimetre-wave Airborne Receivers for Spectro-scopic CHaracterisation in Atmospheric Limb Sounding) instruments onboard the high altitude research aircraft M-55 Geophysica during the flight of the PremierEx (PREMIER Experiment) campaign on 10 March 2010 from Kiruna, Sweden for observation of the Arctic upper troposphere and lower stratosphere. The cloud coverage observed along the flight provided representative test cases to evaluate the synergy in three different scenarios: low clouds in the first part, no clouds in the central part and high tro-pospheric clouds at the end. The calculation of synergistic profiles of four atmospheric targets (i.e., O2, HNO3, H2O and temperature) was performed using a posteriori combination of individual retrieved profiles, i.e., Level 2 (L2) data rather than simultaneous inverse processing of observed radiances, i.e., Level 1 (L1) data. An innovative method of data fusion, based on the Measurement Space Solution (MSS) was applied along with the standard approach of inverse processing of MARSCHALS spectral radiances using MIPAS-STR retrieval products as a priori information (L1 + L2 method). A quantitative estimate and cross-check of the results of MSS and (L1 + L2) data fusion was achieved based on a specific set of quantifiers including the total retrieval error, the number of degrees of freedom, the relative information distribution and the synergy factor. [ABSTRACT FROM AUTHOR]

Published
2015
Full Text
View/download PDF

86. Ground-based assessment of the bias and long-term stability of fourteen limb and occultation ozone profile data records.

Author

Hubert, D., Lambert, J.-C., Verhoelst, T., Granville, J., Keppens, A., Baray, J.-L., Cortesi, U., Degenstein, D. A., Froidevaux, L., Godin-Beekmann, S., Hoppel, K. W., Kyrölä, E., Leblanc, T., Lichtenberg, G., McElroy, C. T., Murtagh, D., Nakane, H., Russell III, J. M., Salvador, J., and Smit, H. G. J.

Subjects
STRATOSPHERE, ARTIFICIAL satellites, OZONE layer, OZONESONDES, ATMOSPHERIC research
Abstract

The ozone profile records of a large number of limb and occultation satellite instruments are widely used to address several key questions in ozone research. Further progress in some domains depends on a more detailed understanding of these data sets, especially of their long-term stability and their mutual consistency. To this end, we make a systematic assessment of fourteen limb and occultation sounders that, together, provide more than three decades of global ozone profile measurements. In particular, we consider the latest operational Level-2 records by SAGE II, SAGE III, HALOE, UARS MLS, Aura MLS, POAM II, POAM III, OSIRIS, SMR, GOMOS, MIPAS, SCIAMACHY, ACE-FTS and MAESTRO. Central to our work is a harmonized and robust analysis of the comparisons against the ground-based ozonesonde and stratospheric ozone lidar networks. It allows us to investigate, from the ground up to the stratopause, the following main aspects of data quality: long-term stability, overall bias, and short-term variability, together with their dependence on geophysical parameters and profile representation. In addition, it permits us to quantify the overall consistency between the ozone profilers. Generally, we find that between 20-40 km, the satellite ozone measurement biases are smaller than ±5%, the short-term variabilities are better than 5-12% and the drifts are at most ±5% decade-1 (and ±3% decade-1 for a few records). The agreement with ground-based data degrades somewhat towards the stratopause and especially towards the tropopause, where natural variability and low ozone abundancies impede a more precise analysis. A few records deviate from the preceding general remarks, in part of the stratosphere; we identify biases of 10% and more (POAM II and SCIAMACHY), markedly higher single-profile variability (SMR and SCIAMACHY), and significant long-term drifts (SCIAMACHY, OSIRIS, HALOE, and possibly GOMOS and SMR as well). Furthermore, we reflect on the repercussions of our findings for the construction, analysis and interpretation of merged data records. Most notably, the discrepancies between several recent ozone profile trend assessments can be mostly explained by instrumental drift. This clearly demonstrates the need for systematic comprehensive multi-instrument comparison analyses. [ABSTRACT FROM AUTHOR]

Published
2015
Full Text
View/download PDF

91. Stratospheric HBr concentration profile obtained from far‐infrared emission spectroscopy

Author

Nolt, I. G., primary, Ade, P. A. R., additional, Alboni, F., additional, Carli, B., additional, Carlotti, M., additional, Cortesi, U., additional, Epifani, M., additional, Griffin, M. J., additional, Hamilton, P. A., additional, Lee, C., additional, Lepri, G., additional, Mencaraglia, F., additional, Murray, A. G., additional, Park, J. H., additional, Park, K., additional, Raspollini, P., additional, Ridolfi, M., additional, and Vanek, M. D., additional

Published
1997
Full Text
View/download PDF

93. Validation and data characteristics of methane and nitrous oxide profiles observed by MIPAS and processed with Version 4.61 algorithm.

Author

Payan, S., Camy-Peyret, C., Oelhaf, H., Wetzel, G., Maucher, G., Keim, C., Pirre, M., Huret, N., Engel, A., Volk, M. C., Kuellmann, H., Kuttippurath, J., Cortesi, U., Bianchini, G., Mencaraglia, F., Raspollini, P., Redaelli, G., Vigouroux, C., de Mazière, M., and Mikuteit, S.

Abstract

The ENVISAT validation programme for the atmospheric instruments MIPAS, SCIAMACHY and GOMOS is based on a number of balloon-bone, aircraft and ground-based correlative measurements. In particular the activities of validation scientists were co-ordinated by ESA within the ENVISAT Stratospheric Aircraft and Balloon Campaign of ESABC. As part of a series of similar papers on other species [this issue] and in parallel to the contribution of the individual validation teams, the present paper provides a synthesis of comparisons performed between MIPAS CH4 and N2O profiles produced by the current ESA operational software (Instrument Processing Facility version 4.61 or IPF v4.61) and correlative measurements obtained from balloon and aircraft experiments as well as from satellite sensors or from ground-based instruments. The MIPAS-E CH4 values show a positive bias in the lower stratosphere of about 10%. In case of N2O no systematic deviation with respect to the validation experiments could be identified. The individual used MIPAS data version 4.61 still exhibits some unphysical oscillations in individual CH4 and N2O profiles caused by the processing algorithm (with almost no regularization). Taking these problems into account, the MIPAS CH4 and N2O profiles are behaving as expected from the internal error estimation of IPF v4.61. [ABSTRACT FROM AUTHOR]

Published
2007
Full Text
View/download PDF

94. Measurement of the water vapour vertical profile and of the Earth's outgoing far infrared flux.

Author

Palchetti, L., Bianchini, G., Carli, B., Cortesi, U., and del Bianco, S.

Abstract

Our understanding of global warming depends on the accuracy with which the atmospheric components that modulate the Earth's radiation budget are known. Many uncertainties still exist on the radiative effect of water in the different spectral regions, among which the far infrared where few observations have been made. An assessment is shown of the atmospheric outgoing flux obtained from a balloon-borne platform with wideband spectrally resolved nadir measurements at the top-of-atmosphere over the full spectral range, including the far infrared, from 100 to 1400 cm-1, made by a Fourier transform spectrometer with uncooled detectors. From these measurements, we retrieve 15 pieces of information about water vapour and temperature profiles, and surface temperature, with a precision of 5% for the mean water vapour profile and a major improvement of the upper troposphere-lower stratosphere knowledge. The retrieved atmospheric state makes it possible to calculate the emitted radiance as a function of the zenith angle and to determine the outgoing radiation flux, proving that spectrally resolved observations can be used to derive accurate information on the integrated flux. While the retrieved temperature is in good agreement with ECMWF analysis, the retrieved water vapour profile differs significantly, and, depending on time and location, the derived flux differs in the far infrared (0-600 cm-1) from that derived from ECMWF by 2-3.5 W/m²±0.4 W/m². The observed discrepancy is larger than current estimates of radiative forcing due to CO2 increases since pre-industrial time. The error with which the flux is determined is caused mainly by calibration uncertainties while detector noise has a negligible effect, proving that uncooled detectors are adequate for top of the atmosphere radiometry. [ABSTRACT FROM AUTHOR]

Published
2007
Full Text
View/download PDF

95. Validation of MIPAS HNO3 operational data.

Author

Wang, D. Y., Höpfner, M., Blom, C. E., Ward, W. E., Fischer, H., Blumenstock, T., Hase, F., Keim, C., Liu, G. Y., Mikuteit, S., Oelhaf, H., Wetzel, G., Cortesi, U., Mencaraglia, F., Bianchini, G., Redaelli, G., Pirre, M., Catoire, V., Huret, N., and Vigouroux, C.

Subjects
INTERFEROMETERS, NITRIC acid, ATMOSPHERE, SPECTROMETERS
Abstract

Nitric acid (HNO3) is one of the key products that are operationally retrieved by the European Space Agency (ESA) from the emission spectra measured by the Michelson Interferometer for Passive Atmospheric Sounding (MIPAS) onboard ENVISAT. The product version 4.61/4.62 for the observation period between July 2002 and March 2004 is validated by comparisons with a number of independent observations from ground-based stations, aircraft/balloon campaigns, and satellites. Individual HNO3 profiles of the ESA MIPAS level-2 product show good agreement with those of MIPAS-B and MIPAS-STR (the balloon and aircraft version of MIPAS, respectively), and the balloon-borne infrared spectrometers MkIV and SPIRALE, mostly matching the reference data within the combined instrument error bars. In [ABSTRACT FROM AUTHOR]

Published
2007
Full Text
View/download PDF

96. First spectral measurement of the Earth's upwelling emission using an uncooled wideband Fourier transform spectrometer.

Author

Palchetti, L., Belotti, C., Bianchini, G., Castagnoli, F., Carli, B., Cortesi, U., Pellegrini, M., Camy-Peyret, C., Jeseck, P., and Té, Y.

Abstract

The first spectral measurement of Earth's emitted radiation to space in the wideband range from 100 to 1400 cm-1 with 0.5cm-1 spectral resolution is presented. The measurement was performed from a stratospheric balloon in tropical region using a Fourier transform spectrometer, during a field campaign held in Brazil in June 2005. The instrument, which has uncooled components including the detector module, is a prototype developed as part of the study for the REFIR (Radiation Explorer in the Far InfraRed) space mission. This paper shows the results of the field campaign with particular attention to the measurement capabilities of the prototype. The results are compared with measurements taken by IASI-balloon (Infrared Atmospheric Sounding Interferometer -- Balloon version), aboard the same platform, and with forward model estimations. The infrared signature of clouds is observed in the measurements. [ABSTRACT FROM AUTHOR]

Published
2006
Full Text
View/download PDF

99. Validation of version-4.61 methane and nitrous oxide observed by MIPAS

Author

Payan, S., Camy-Peyret, C., Oelhaf, H., Wetzel, G., Maucher, G., Keim, C., Pirre, M., Huret, N., Engel, A., Volk, M.C., Kuellmann, H., Kuttippurath, J., Cortesi, U., Bianchini, G., Mencaraglia, F., Raspollini, P., Redaelli, G., Vigouroux, C., DeMazìere, M., Mikuteit, S., Blumenstock, T., Velazco, V., Notholt, J., Mahieu, E., Duchatelet, P., Smale, D., Wood, S., Jones, N., Piccolo, C., Payne, V., Bracher, A., Glatthor, N., Stiller, G., Grunow, K., Jeseck, P., Te, Y., and Butz, A.

Subjects
13. Climate action

100. Geophysical validation of MIPAS-ENVISAT operational ozone data

Author

Cortesi, U., Lambert, J.C., Clercq, C. De, Bianchini, G., Blumenstock, T., Bracher, A., Castelli, E., Catoire, V., Chance, K.V., Maziere, M. De, Demoulin, P., Godin-Beekmann, S., Jones, N., Jucks, K., Keim, C., Kerzenmacher, T., Kuellmann, H., Kuttippurath, J., Iarlori, M., Liu, G.Y., Liu, Y., McDermid, I.S., Meijer, Y.J., Mencaraglia, F., Mikuteit, S., Oelhaf, H., Piccolo, C., Pirre, M., Raspollini, P., Ravegnani, F., Reburn, W.J., Redaelli, G., Remedios, J.J., Sembhi, H., Smale, D., Steck, T., Taddei, A., Varotsos, C., Vigouroux, C., Waterfall, A., Wetzel, G., and Wood, S.

Subjects
13. Climate action, 7. Clean energy
Abstract

The Michelson Interferometer for Passive Atmospheric Sounding (MIPAS), on-board the European ENVIronmental SATellite (ENVISAT) launched on 1 March 2002, is a middle infrared Fourier Transform spectrometer measuring the atmospheric emission spectrum in limb sounding geometry. The instrument is capable to retrieve the vertical distribution of temperature and trace gases, aiming at the study of climate and atmospheric chemistry and dynamics, and at applications to data assimilation and weather forecasting. MIPAS operated in its standard observation mode for approximately two years, from July 2002 to March 2004, with scans performed at nominal spectral resolution of 0.025 cm−1 and covering the altitude range from the mesosphere to the upper troposphere with relatively high vertical resolution (about 3 km in the stratosphere). Only reduced spectral resolution measurements have been performed subsequently. MIPAS data were re-processed by ESA using updated versions of the Instrument Processing Facility (IPF v4.61 and v4.62) and provided a complete set of level-2 operational products (geolocated vertical profiles of temperature and volume mixing ratio of H2O, O3, HNO3, CH4, N2O and NO2) with quasi continuous and global coverage in the period of MIPAS full spectral resolution mission. In this paper, we report a detailed description of the validation of MIPAS-ENVISAT operational ozone data, that was based on the comparison between MIPAS v4.61 (and, to a lesser extent, v4.62) O3 VMR profiles and a comprehensive set of correlative data, including observations from ozone sondes, ground-based lidar, FTIR and microwave radiometers, remote-sensing and in situ instruments on-board stratospheric aircraft and balloons, concurrent satellite sensors and ozone fields assimilated by the European Center for Medium-range Weather Forecasting. A coordinated effort was carried out, using common criteria for the selection of individual validation data sets, and similar methods for the comparisons. This enabled merging the individual results from a variety of independent reference measurements of proven quality (i.e. well characterized error budget) into an overall evaluation of MIPAS O3 data quality, having both statistical strength and the widest spatial and temporal coverage. Collocated measurements from ozone sondes and ground-based lidar and microwave radiometers of the Network for the Detection Atmospheric Composition Change (NDACC) were selected to carry out comparisons with time series of MIPAS O3 partial columns and to identify groups of stations and time periods with a uniform pattern of ozone differences, that were subsequently used for a vertically resolved statistical analysis. The results of the comparison are classified according to synoptic and regional systems and to altitude intervals, showing a generally good agreement within the comparison error bars in the upper and middle stratosphere. Significant differences emerge in the lower stratosphere and are only partly explained by the larger contributions of horizontal and vertical smoothing differences and of collocation errors to the total uncertainty. Further results obtained from a purely statistical analysis of the same data set from NDACC ground-based lidar stations, as well as from additional ozone soundings at middle latitudes and from NDACC ground-based FTIR measurements, confirm the validity of MIPAS O3 profiles down to the lower stratosphere, with evidence of larger discrepancies at the lowest altitudes. The validation against O3 VMR profiles using collocated observations performed by other satellite sensors (SAGE II, POAM III, ODIN-SMR, ACE-FTS, HALOE, GOME) and ECMWF assimilated ozone fields leads to consistent results, that are to a great extent compatible with those obtained from the comparison with ground-based measurements. Excellent agreement in the full vertical range of the comparison is shown with respect to collocated ozone data from stratospheric aircraft and balloon instruments, that was mostly obtained in very good spatial and temporal coincidence with MIPAS scans. This might suggest that the larger differences observed in the upper troposphere and lowermost stratosphere with respect to collocated ground-based and satellite O3 data are only partly due to a degradation of MIPAS data quality. They should be rather largely ascribed to the natural variability of these altitude regions and to other components of the comparison errors. By combining the results of this large number of validation data sets we derived a general assessment of MIPAS v4.61 and v4.62 ozone data quality. A clear indication of the validity of MIPAS O3 vertical profiles is obtained for most of the stratosphere, where the mean relative difference with the individual correlative data sets is always lower than ±10%. Furthermore, these differences always fall within the combined systematic error (from 1 hPa to 50 hPa) and the standard deviation is fully consistent with the random error of the comparison (from 1 hPa to ~30–40 hPa). A degradation in the quality of the agreement is generally observed in the lower stratosphere and upper troposphere, with biases up to 25% at 100 hPa and standard deviation of the global mean differences up to three times larger than the combined random error in the range 50–100 hPa. The larger differences observed at the bottom end of MIPAS retrieved profiles can be associated, as already noticed, to the effects of stronger atmospheric gradients in the UTLS that are perceived differently by the various measurement techniques. However, further components that may degrade the results of the comparison at lower altitudes can be identified as potentially including cloud contamination, which is likely not to have been fully filtered using the current settings of the MIPAS cloud detection algorithm, and in the linear approximation of the forward model that was used for the a priori estimate of systematic error components. The latter, when affecting systematic contributions with a random variability over the spatial and temporal scales of global averages, might result in an underestimation of the random error of the comparison and add up to other error sources, such as the possible underestimates of the p and T error propagation based on the assumption of a 1K and 2% uncertainties, respectively, on MIPAS temperature and pressure retrievals. At pressure lower than 1 hPa, only a small fraction of the selected validation data set provides correlative ozone data of adequate quality and it is difficult to derive quantitative conclusions about the performance of MIPAS O3 retrieval for the topmost layers.

Catalog

Books, media, physical & digital resources
See catalog results