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32 results on '"Hendrick, F."'

1. Ground-based validation of the MetOp-A and MetOp-B GOME-2 OClO measurements

Author

Pinardi, G., Roozendael, M., Hendrick, F., Richter, A., Valks, P., Alwarda, R., Bognar, K., a, Frieß, U., Granville, J., Gu, M., Johnston, P., Prados-Roman, C., Querel, R., Strong, K., Wagner, T., Wittrock, F., and Gonzalez, M.

Subjects
atmospheric OClO, Atmospheric Science, GOME-2, satellite, ground-based validation
Abstract

This paper reports on ground-based validation of the atmospheric OClO data record produced within the framework of EUMETSAT's Satellite Application Facility on Atmospheric Chemistry Monitoring (AC SAF) using the Global Ozone Monitoring Experiment (GOME)-2A and GOME-2B instrument measurements, covering the 2007–2016 and 2013–2016 periods, respectively. OClO slant column densities are compared to correlative measurements collected from nine Zenith-Scattered-Light Differential Optical Absorption Spectroscopy (ZSL-DOAS) instruments from the Network for the Detection of Atmospheric Composition Change (NDACC) distributed in both the Arctic and Antarctic. Sensitivity tests are performed on the ground-based data to estimate the impact of the different OClO DOAS analysis settings. On this basis, we infer systematic uncertainties of about 25 % (i.e., about 3.75×1013 molec. cm−2) between the different ground-based data analyses, reaching total uncertainties ranging from about 26 % to 33 % for the different stations (i.e., around 4 to 5×1013 molec. cm−2). Time series at the different sites show good agreement between satellite and ground-based data for both the inter-annual variability and the overall OClO seasonal behavior. GOME-2A results are found to be noisier than those of GOME-2B, especially after 2011, probably due to instrumental degradation effects. Daily linear regression analysis for OClO-activated periods yield correlation coefficients of 0.8 for GOME-2A and 0.87 for GOME-2B, with slopes with respect to the ground-based data ensemble of 0.64 and 0.72, respectively. Satellite minus ground-based offsets are within 8×1013 molec. cm−2, with some differences between GOME-2A and GOME-2B depending on the station. Overall, considering all the stations, a median offset of about -2.2×1013 molec. cm−2 is found for both GOME-2 instruments.

Published
2022
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3. Validation of CAMS regional services: concentrations above the surface - status update for March - May 2021

Author

Douros, J., Eskes, H.J., Akritidis, D., Antonakaki, T., Bennouna, Y., Blechschmidt, A.-M., Bösch, T., Clark, H., Frietzsche, P., Gielen, C., Hendrick, F., Kapsomenakis, J., Kartsios, S., Katragkou, E., Melas, D., Mortier, A., Peters, E., Petersen, K., Piters, A., Richter, A., van Roozendael, M., Schulz, M., Sudarchikova, N., Wagner, A., Zanis, P., and Zerefos, C.

Published
2021
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4. Validation of CAMS regional services: concentrations above the surface - status update for September - November 2020

Author

Douros, J., Eskes, H.J., Akritidis, D., Antonakaki, T., Bennouna, Y., Blechschmidt, A.-M., Bösch, T., Clark, H., Gielen, C., Hendrick, F., Kapsomenakis, J., Kartsios, S., Katragkou, E., Melas, D., Mortier, A., Peters, E., Petersen, K., Piters, A., Richter, A., van Roozendael, M., Schulz, M., Sudarchikova, N., Wagner, A., Zanis, P., and Zerefos, C.

Published
2021
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5. Validation of CAMS regional services: concentrations above the surface - status update for December 2020 - February 2021

Author

Douros, J., Eskes, H.J., Akritidis, D., Antonakaki, T., Bennouna, Y., Blechschmidt, A.-M., Bösch, T., Clark, H., Gielen, C., Hendrick, F., Kapsomenakis, J., Kartsios, S., Katragkou, E., Melas, D., Mortier, A., Peters, E., Petersen, K., Piters, A., Richter, A., van Roozendael, M., Schulz, M., Sudarchikova, N., Wagner, A., Zanis, P., and Zerefos, C.

Published
2021
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6. Validation of CAMS regional services: concentrations above the surface - status update for March - May 2020

Author

Douros, J., Eskes, H.J., Akritidis, D., Antonakaki, T., Bennouna, Y., Blechschmidt, A.-M., Bösch, T., Clark, H., Gielen, C., Hendrick, F., Kapsomenakis, J., Kartsios, S., Katragkou, E., Melas, D., Mortier, A., Peters, E., Petersen, K., Piters, A., Richter, A., van Roozendael, M., Schulz, M., Sudarchikova, N., Wagner, A., Zanis, P., and Zerefos, C.

Published
2020
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7. Validation of CAMS regional services: concentrations above the surface - status update for September - November 2019

Author

Douros, J., Eskes, H.J., Akritidis, D., Antonakaki, T., Bennouna, Y., Blechschmidt, A.-M., Bösch, T., Clark, H., Gielen, C., Hendrick, F., Kapsomenakis, J., Kartsios, S., Katragkou, E., Melas, D., Mortier, A., Peters, E., Petersen, K., Piters, A., Richter, A., van Roozendael, M., Schulz, M., Sudarchikova, N., Wagner, A., Zanis, P., and Zerefos, C.

Published
2020
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8. Validation of CAMS regional services: concentrations above the surface - status update for December 2019 - February 2020

Author

Douros, J., Eskes, H.J., Akritidis, D., Antonakaki, T., Bennouna, Y., Blechschmidt, A.-M., Bösch, T., Clark, H., Gielen, C., Hendrick, F., Kapsomenakis, J., Kartsios, S., Katragkou, E., Melas, D., Mortier, A., Peters, E., Petersen, K., Piters, A., Richter, A., van Roozendael, M., Schulz, M., Sudarchikova, N., Wagner, A., Zanis, P., and Zerefos, C.

Published
2020
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9. Validation of CAMS regional services: concentrations above the surface - status update for June - August 2020

Author

Douros, J., Eskes, H.J., Akritidis, D., Antonakaki, T., Bennouna, Y., Blechschmidt, A.-M., Bösch, T., Clark, H., Gielen, C., Hendrick, F., Kapsomenakis, J., Kartsios, S., Katragkou, E., Melas, D., Mortier, A., Peters, E., Petersen, K., Piters, A., Richter, A., van Roozendael, M., Schulz, M., Sudarchikova, N., Wagner, A., Zanis, P., and Zerefos, C.

Published
2020
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10. Resolution of the Identity of 'Candidatus Liberibacter' Species From Huanglongbing-Affected Citrus in East Africa

Author

Zuberi S. Seguni, Hendrick F le Roux, Sunday Ekesi, Chanel Steyn, Gerhard Pietersen, Ivan Rwomushana, Glynnis Cook, Peterson W. Nderitu, Fathiya M. Khamis, T. G. Grout, Ronel Roberts, and Christopher L. Materu

Subjects
0106 biological sciences, 0301 basic medicine, Citrus, Candidatus Liberibacter, Diaphorina citri, Plant Science, Subspecies, Real-Time Polymerase Chain Reaction, 01 natural sciences, 03 medical and health sciences, South Africa, Rhizobiaceae, parasitic diseases, Botany, Animals, Ribosomal DNA, biology, Host (biology), Africa, Eastern, biology.organism_classification, 16S ribosomal RNA, Trioza erytreae, 030104 developmental biology, Rutaceae, Genes, Bacterial, Agronomy and Crop Science, 010606 plant biology & botany
Abstract

‘Candidatus Liberibacter asiaticus’, the bacterium associated with citrus Huanglongbing (HLB), was reported from Uganda and tentatively from Tanzania, posing a threat to citriculture in Africa. Two surveys of citrus expressing typical HLB symptoms were conducted in Uganda, Kenya, and Tanzania to verify reports of ‘Ca. L. asiaticus’ and to assess the overall threat of HLB to eastern and southern African citrus production. Samples were analyzed for the presence of ‘Candidatus Liberibacter’ species by real-time PCR and partial sequencing of three housekeeping genes, 16S rDNA, rplJ, and omp. ‘Ca. L. africanus’, the bacterium historically associated with HLB symptoms in Africa, was detected in several samples. However, samples positive in real-time PCR for ‘Ca. L. asiaticus’ were shown not to contain ‘Ca. L. asiaticus’ by sequencing. Sequences obtained from these samples were analogous to ‘Ca. L. africanus subsp. clausenae’, identified from an indigenous Rutaceae species in South Africa, and not to ‘Ca. L. asiaticus’. Results indicate a nontarget amplification of the real-time assay and suggest that previous reports of ‘Ca. L. asiaticus’ from Uganda and Tanzania may be mis-identifications of ‘Ca. L. africanus subsp. clausenae’. This subspecies was additionally detected in individual Diaphorina citri and Trioza erytreae specimens recovered from collection sites. This is the first report of ‘Ca. L. africanus subsp. clausenae’ infecting citrus and being associated with HLB symptoms in this host.

Published
2019

11. Validation of CAMS regional services: concentrations above the surface - status update for June - August 2019

Author

Douros, J., Eskes, H.J., Akritidis, D., Antonakaki, T., Bennouna, Y., Blechschmidt, A.-M., Bösch, T., Clark, H., Gielen, C., Hendrick, F., Kapsomenakis, J., Kartsios, S., Katragkou, E., Melas, D., Mortier, A., Peters, E., Petersen, K., Piters, A., Richter, A., van Roozendael, M., Schulz, M., Sudarchikova, N., Wagner, A., Zanis, P., and Zerefos, C.

Published
2019
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15. Metrology of ground-based satellite validation: co-location mismatch and smoothing issues of total ozone comparisons [Discussion paper]

Author

Verhoelst, T., Granville, Jose, Hendrick, F., Köhler, Ulf, Lerot, Christophe, Pommereau, Jean-Pierre, Redondas, Alberto, Roozendael, Michel Van, and Lambert, Jean-Christopher

Subjects
Observing System Simulation Experiments, Datos de satélite, Composición de la atmósfera, Validación de datos, Atmospheric composition, Satellite data, Validation
Abstract

Comparisons between satellite and ground-based measurements of the atmosphere are inevitably affected by natural variability due to mismatches in spatial and temporal co-location. These additional terms in the comparison error budget are quantified here for total ozone column comparisons using an Observing System Simulation Experiment. Even when using tight co-location criteria, atmospheric variability is found to impact the comparisons significantly. Part of this work was funded by the Belgian Science Policy O ce (BELSPO) and ESA via the ProDEx projects A3C and ACROSAT, and by the EU H2020 project GAIA-CLIM (Ares(2014)3708963/Project 640276). Finally, the 20 authors acknowledge the pioneering research carried out in 2008–2012 by C. De Clercq and S. Vandenbussche and funded by the EU FP6 project GEOmon (FP6-2005-Global-4-036677) and ProDEx project SECPEA.

Published
2015

16. CEOS Intercalibration of Ground-Based Spectrometers and Lidars: Contract Change Notice 2012-2013: Final Report

Author

Roozendael, Michel Van, Kyrö, Esko, Karppinen, Tomi, Redondas, Alberto, Cede, Alexander, and Hendrick, F.

Subjects
Ozone measurements, Brewer spectrophotometers, Calibration, Ozone spectrophotometers, Dobson spectrophotometers
Abstract

This document is the final report of the Intercalibration of ground-based spectrometers and Lidars - Extension 2012-2013. It summarizes the activities performed in the period from November 2012 until December 2013 and the main results obtained.

Published
2014

17. ChemInform Abstract: Base-Free Dehydrogenative Coupling of Enolizable Carbonyl Compounds with Silanes

Author

Kazuyuki Tatsumi, Yasuhiro Ohki, Hendrick F. T. Klare, C. David F. Koenigs, and Martin Oestreich

Subjects
Coupling (electronics), chemistry.chemical_compound, Silanes, chemistry, Base free, Polymer chemistry, General Medicine, Catalysis
Abstract

The catalysis with complex (I) proceeds mostly chemoselectively for a wide range of linear or cyclic, aromatic or aliphatic ketones.

Published
2012
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20. The SHIVA Western Pacific campaign in fall 2011

Author

Pfeilsticker, K., Dorf, M., Sturges, B., Oram, D., Engel, A., Markus Rex, Bracher, A., Roozendael, M., Hendrick, F., Theys, N., Krüger, K., Quack, B., Wallace, D., Fueglistaler, S., Pyle, J., Marecal, V., Catoire, V., Pirre, M., Chipperfield, M., Heard, D., Stohl, A., Eckhardt, S., Sinnhuber, B. -M, Rozanov, A., Wittrock, F., Schlager, H., Samah, A. A., Phang, S. M., Anton, A., Sentian, J., Lim, P. T., Mujahid, A., Abdullah, N. A., Maznorizan, and Mokhtar, N. A. B. H.

21. GDP 4.0 transfer to SGP 3.0 for SCIAMACHY no2 column processing: Verification with SDOAS / GDOAS prototype algorithms and delta-validation with NDACC / UV-visible network data

Author

Lambert, J. -C, Granville, J., Lerot, C., Hendrick, F., Roozendael, M., Andersen, S. B., Dorokhov, V., Gerard, P., Gil, M., Goutail, F., Gruzdev, A. N., Held, G., Ionov, D. V., Johnston, P. V., Kostadinov, I., Kreher, K., Kyrö, E., Leveau, J., Mónica Navarro-Comas, Petritoli, A., Pommereau, J. -P, Richter, A., Roscoe, H. K., Semenov, V. K., Stebel, K., Vaughan, G., Wagner, T., Wittrock, F., and Yela, M.

22. End-to-end validation of EPS / MetOp GOME-2 trace gas data

Author

Lambert, J. -C, Roozendael, M., Andersen, S. B., Burrows, J. P., Clercq, C., Smedt, I., Dorokhov, V., Elansky, N. F., Gil, M., Goutail, F., Held, G., Hendrick, F., Høiskar, B. A. K., Dmitry Ionov, Johnston, P. V., Kostadinov, I., Kreher, K., Kyrö, E., Leveau, J., Loyola, D., Müller, J. -F, Petritoli, A., Pinardi, G., Platt, U., Pommereau, J. -P, Puentedura, O., Richter, A., Roscoe, H. K., Semenov, V., Slijkhuis, S., Spurr, R. J. D., Timofeyev, Yu M., Tørnkvist, K. K., Vaughan, G., Wagner, T., Wahl, S., Wittrock, F., and Yela, M.

25. Improved mapping of formaldehyde and glyoxal emission sources using S5P/TROPOMI

Author

Van Roozendael, Michel, Lerot, Christophe, De Smedt, Isabelle, Theys, Nicolas, Bauwens, Maite, Cheng, Zhibin, Friedrich, Martina M., Hedelt, Pascal, Hendrick, F., Loyola, Diego, Muller, J.F., Pinardi, Gaia, Stavrakou, Trissevgeni, Vigouroux, Corinne, Vlietinck, Jonas, and Yu, Huan

Subjects
S5P, Formaldehyde, Glyoxal, TROPOMI

26. Geophysical validation of sciamachy NO2 vertical columns: Overview of early 2004 results

Author

Lambert, J. -C, Blumenstock, T., Boersma, F., Bracher, A., Mazière, M., Demoulin, P., Smedt, I., Eskes, H., Gil, M., Goutai, F., Granville, J., Hendrick, F., Ionov, D. V., Johnston, P. V., Kostadinov, I., Kreher, K., Kyrö, E., Martin, R., Meier, A., Mónica Navarro-Comas, Petritoli, A., Pommereau, J. -P, Richter, A., Roscoe, H. K., Sioris, C., Sussmann, R., Roozendael, M., Wagner, T., Wood, S., and Yela, M.

28. Validation of MIPAS-ENVISAT version 4.61 operational data: NO2

Author

Wetzer, G., Blumenstock, T., Oelhaf, H., Stiller, G. P., Wang, D. -Y, Zhang, G., Pirre, M., Goutail, F., Bazureau, A., Pommereau, J. -P, Bracher, A., Sinnhuber, M., Weber, M., Bramstedt, K., Funke, B., Manuel López-Puertas, Kostadinov, I., Petritoli, A., Alfaro, A., Hendrick, F., Roozendael, M., and Mazière, M.

29. GDP 4.0 transfer to SGP 3.0 for SCIAMACHY no2 column processing: Verification with SDOAS / GDOAS prototype algorithms and delta-validation with NDACC / UV-visible network data

Author

Lambert, J. -C, Granville, J., Lerot, C., Hendrick, F., Roozendael, M., Andersen, S. B., Dorokhov, V., Gerard, P., Gil, M., Goutail, F., Gruzdev, A. N., Held, G., Dmitry Ionov, Johnston, P. V., Kostadinov, I., Kreher, K., Kyrö, E., Leveau, J., Navarro-Comas, M., Petritoli, A., Pommereau, J. -P, Richter, A., Roscoe, H. K., Semenov, V. K., Stebel, K., Vaughan, G., Wagner, T., Wittrock, F., and Yela, M.

30. Validation of NO2 and NO from the Atmospheric Chemistry Experiment (ACE)

Author

Kerzenmacher, T., Wolff, M. A., Strong, K., Dupuy, E., Walker, K. A., Amekudzi, L. K., Batchelor, R. L., Bernath, P. F., Berthet, G., Blumenstock, T., Boone, C. D., Bramstedt, K., Brogniez, C., Brohede, S., John Philip Burrows, Catoire, V., Dodion, J., Drummond, J. R., Dufour, D. G., Funke, B., Fussen, D., Goutail, F., Griffith, D. W. T., Haley, C. S., Hendrick, F., Höpfner, M., Huret, N., Jones, N., Kar, J., Kramer, I., Llewellyn, E. J., López-Puertas, M., Manney, G., Mcelroy, C. T., Mclinden, C. A., Melo, S., Mikuteit, S., Murtagh, D., Nichitiu, F., Notholt, J., Nowlan, C., Piccolo, C., Pommereau, J. -P, Randall, C., Raspollini, P., Ridolfi, M., Richter, A., Schneider, M., Schrems, O., Silicani, M., Stiller, G. P., Taylor, J., Tétard, C., Toohey, M., Vanhellemont, F., Warneke, T., Zawodny, J. M., and Zou, J.

31. Geophysical validation of sciamachy NO2 vertical columns: Overview of early 2004 results

Author

Lambert, J. -C, Blumenstock, T., Boersma, F., Bracher, A., Mazière, M., Demoulin, P., Smedt, I., Eskes, H., Gil, M., Goutai, F., Granville, J., Hendrick, F., Dmitry Ionov, Johnston, P. V., Kostadinov, I., Kreher, K., Kyrö, E., Martin, R., Meier, A., Navarro-Comas, M., Petritoli, A., Pommereau, J. -P, Richter, A., Roscoe, H. K., Sioris, C., Sussmann, R., Roozendael, M., Wagner, T., Wood, S., Yela, M., and Danesy, Dorothea

Subjects
Earth and Related Environmental Sciences
Abstract

Following the recommendations drawn after the Commissioning Phase of the ENVISAT satellite in 2002, SCIAMACHY near real time data processors were upgraded to version 5.01 in early 2004. Before public release of the new SCIAMACHY nitrogen dioxide (NO2) vertical column data product, several validation teams investigated its improvement and assessed its geophysical consistency by means of correlative studies involving NDSC-affiliated ground-based networks of DOAS UV-visible and FTIR spectrometers and the ERS-2 GOME satellite. In parallel, preliminary SCIAMACHY NO2 column data products generated by research processors under development at scientific institutes were also tested,using the same correlative data and validation procedures. Digesting the results obtained by a list of validation teams and SCIAMACHY data processing teams, this overview paper draws a preliminary quality assessment of the SCIAMACHY NO2 column data sets available in spring 2004.

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