19 results on '"Huey, L.G."'
Search Results
2. An assessment of the polar HO x photochemical budget based on 2003 Summit Greenland field observations
- Author
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Chen, G., Huey, L.G., Crawford, J.H., Olson, J.R., Hutterli, M.A., Sjostedt, S., Tanner, D., Dibb, J., Lefer, B., Blake, N., Davis, Douglas, and Stohl, A.
- Published
- 2007
- Full Text
- View/download PDF
3. Observations of hydroxyl and the sum of peroxy radicals at Summit, Greenland during summer 2003
- Author
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Sjostedt, S.J., Huey, L.G., Tanner, D.J., Peischl, J., Chen, G., Dibb, J.E., Lefer, B., Hutterli, M.A., Beyersdorf, A.J., Blake, N.J., Blake, D.R., Sueper, D., Ryerson, T., Burkhart, J., and Stohl, A.
- Published
- 2007
- Full Text
- View/download PDF
4. CIMS measurements of HNO3 and SO2 at the South Pole during ISCAT 2000
- Author
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Huey, L.G., Tanner, D.J., Slusher, D.L., Dibb, J.E., Arimoto, R., Chen, G., Davis, D., Buhr, M.P., Nowak, J.B., Mauldin, R.L., III, Eisele, F.L., and Kosciuch, E.
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- 2004
- Full Text
- View/download PDF
5. A reassessment of HOx South Pole chemistry based on observations recorded during ISCAT 2000
- Author
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Chen, G., Davis, D., Crawford, J., Hutterli, L.M., Huey, L.G., Slusher, D., Mauldin, L., Eisele, F., Tanner, D., Dibb, J., Buhr, M., McConnell, J., Lefer, B., Shetter, R., Blake, D., Song, C.H., Lombardi, K., and Arnoldy, J.
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- 2004
- Full Text
- View/download PDF
6. Stratospheric Injection of Brominated Very Short-Lived Substances: Aircraft Observations in the Western Pacific and Representation in Global Models
- Author
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National Science Foundation (US), National Aeronautics and Space Administration (US), National Center for Atmospheric Research (US), British Atmospheric Data Centre, Australian Research Council, Australian Antarctic Division, German Climate Computing Center, Federal Ministry of Education and Research (Germany), Wales, P. A., Salawitch, R. J., Nicely, J. M., Anderson, D. C., Canty, T. P., Baidar, S., Dix, B., Koenig, T.K., Volkamer, R., Chen, D., Huey, L.G., Tanner, D. J., Cuevas, Carlos A., Fernández, Rafael P., Kinnison, Douglas E., Lamarque, Jean-François, Saiz-Lopez, A., Atlas, Elliot L., Hall, S.R., Navarro, M. A., Pan, L.L., Schauffler, S. M., Stell, M., Tilmes, S., Ullmann, K., Weinheimer, A. J., Akiyoshi, Hideharu, Chipperfield, M.P., Deushi, Makoto, Dhomse, S. S., Feng, W., Graf, P., Hossaini, R., Jöckel, P., Mancini, E., Michou, M., Morgenstern, O., Oman, L. D., Pitari, G., Plummer, David A., Revell, L. E., Rozanov, E., Saint-Martin, D., Schofield, R., Stenke, A., Stone, K. A., Visioni, D., Yamashita, Y., Zeng, G., National Science Foundation (US), National Aeronautics and Space Administration (US), National Center for Atmospheric Research (US), British Atmospheric Data Centre, Australian Research Council, Australian Antarctic Division, German Climate Computing Center, Federal Ministry of Education and Research (Germany), Wales, P. A., Salawitch, R. J., Nicely, J. M., Anderson, D. C., Canty, T. P., Baidar, S., Dix, B., Koenig, T.K., Volkamer, R., Chen, D., Huey, L.G., Tanner, D. J., Cuevas, Carlos A., Fernández, Rafael P., Kinnison, Douglas E., Lamarque, Jean-François, Saiz-Lopez, A., Atlas, Elliot L., Hall, S.R., Navarro, M. A., Pan, L.L., Schauffler, S. M., Stell, M., Tilmes, S., Ullmann, K., Weinheimer, A. J., Akiyoshi, Hideharu, Chipperfield, M.P., Deushi, Makoto, Dhomse, S. S., Feng, W., Graf, P., Hossaini, R., Jöckel, P., Mancini, E., Michou, M., Morgenstern, O., Oman, L. D., Pitari, G., Plummer, David A., Revell, L. E., Rozanov, E., Saint-Martin, D., Schofield, R., Stenke, A., Stone, K. A., Visioni, D., Yamashita, Y., and Zeng, G.
- Abstract
We quantify the stratospheric injection of brominated very short-lived substances (VSLS) based on aircraft observations acquired in winter 2014 above the Tropical Western Pacific during the CONvective TRansport of Active Species in the Tropics (CONTRAST) and the Airborne Tropical TRopopause EXperiment (ATTREX) campaigns. The overall contribution of VSLS to stratospheric bromine was determined to be 5.0 ± 2.1 ppt, in agreement with the 5 ± 3 ppt estimate provided in the 2014 World Meteorological Organization (WMO) Ozone Assessment report (WMO 2014), but with lower uncertainty. Measurements of organic bromine compounds, including VSLS, were analyzed using CFC-11 as a reference stratospheric tracer. From this analysis, 2.9 ± 0.6 ppt of bromine enters the stratosphere via organic source gas injection of VSLS. This value is two times the mean bromine content of VSLS measured at the tropical tropopause, for regions outside of the Tropical Western Pacific, summarized in WMO 2014. A photochemical box model, constrained to CONTRAST observations, was used to estimate inorganic bromine from measurements of BrO collected by two instruments. The analysis indicates that 2.1 ± 2.1 ppt of bromine enters the stratosphere via inorganic product gas injection. We also examine the representation of brominated VSLS within 14 global models that participated in the Chemistry-Climate Model Initiative. The representation of stratospheric bromine in these models generally lies within the range of our empirical estimate. Models that include explicit representations of VSLS compare better with bromine observations in the lower stratosphere than models that utilize longer-lived chemicals as a surrogate for VSLS.
- Published
- 2018
7. High temporal resolution Br2, BrCl and BrO observations in coastal Antarctica
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Buys, Z., Brough, N., Huey, L.G., Tanner, D.J., von Glasow, R., and Jones, A.E.
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lcsh:Chemistry ,lcsh:QD1-999 ,lcsh:Physics ,lcsh:QC1-999 - Abstract
There are few observations of speciated inorganic bromine in polar regions against which to test current theory. Here we report the first high temporal resolution measurements of Br2, BrCl and BrO in coastal Antarctica, made at Halley during spring 2007 using a Chemical Ionisation Mass Spectrometer (CIMS). We find indications for an artefact in daytime BrCl measurements arising from conversion of HOBr, similar to that already identified for observations of Br2 made using a similar CIMS method. Using the MISTRA model, we estimate that the artefact represents a conversion of HOBr to Br2 of the order of several tens of percent, while that for HOBr to BrCl is less but non-negligible. If the artefact is indeed due to HOBr conversion, then nighttime observations were unaffected. It also appears that all daytime BrO observations were artefact-free. Mixing ratios of BrO, Br2 and BrCl ranged from instrumental detection limits to 13 pptv (daytime), 45 pptv (nighttime), and 6 pptv (nighttime), respectively. We see considerable variability in the Br2 and BrCl observations over the measurement period which is strongly linked to the prevailing meteorology, and thus air mass origin. Higher mixing ratios of these species were generally observed when air had passed over the sea-ice zone prior to arrival at Halley, than from over the continent. Variation in the diurnal structure of BrO is linked to previous model work where differences in the photolysis spectra of Br2 and O3 is suggested to lead to a BrO maximum at sunrise and sunset, rather than a noon-time maxima. This suite of Antarctic data provides the first analogue to similar measurements made in the Arctic, and of note is that our maximum measured BrCl (nighttime) is less than half of the maximum measured during a similar period (spring-time) in the Arctic (also nighttime). This difference in maximum measured BrCl may also be the cause of a difference in the Br2 : BrCl ratio between the Arctic and Antarctic. An unusual event of trans-continental air mass transport appears to have been responsible for severe surface ozone depletion observed at Halley over a 2-day period. The halogen source region appears to be the Bellingshausen Sea, to the west of the Antarctic Peninsula, with the air mass having spent 3 1/2 days in complete darkness crossing the continent prior to arrival at Halley.
- Published
- 2013
8. The convective transport of active species in the tropics (Contrast) experiment
- Author
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European Commission, Pan, L.L., Atlas, Elliot L., Salawitch, R.J., Honomichl, S.B., Bresch, J.F., Randel, W.J., Apel, E.C., Hornbrook, Rebecca S., Weinheimer, A.J., Anderson, D.C., Andrews, S.J., Baidar, S., Beaton, S.P., Campos, T.L., Carpenter, L.J., Chen, D., Dix, B., Donets, V., Hall, S.R., Hanisco, T.F., Homeyer, C.R., Huey, L.G., Jensen, J.B., Kaser, L., Kinnison, Douglas E., Koenig, T.K., Lamarque, Jean-François, Liu, C., Luo, J., Luo, Z.J., Montzka, D.D., Nicely, J.M., Pierce, Robert Bradley, Riemer, D.D., Robinson, T., Romashkin, P., Saiz-Lopez, A., Schauffler, S., Shieh, O., Stell, M.H., Ullmann, K., Vaughan, G., Volkamer, R., Wolfe, G., European Commission, Pan, L.L., Atlas, Elliot L., Salawitch, R.J., Honomichl, S.B., Bresch, J.F., Randel, W.J., Apel, E.C., Hornbrook, Rebecca S., Weinheimer, A.J., Anderson, D.C., Andrews, S.J., Baidar, S., Beaton, S.P., Campos, T.L., Carpenter, L.J., Chen, D., Dix, B., Donets, V., Hall, S.R., Hanisco, T.F., Homeyer, C.R., Huey, L.G., Jensen, J.B., Kaser, L., Kinnison, Douglas E., Koenig, T.K., Lamarque, Jean-François, Liu, C., Luo, J., Luo, Z.J., Montzka, D.D., Nicely, J.M., Pierce, Robert Bradley, Riemer, D.D., Robinson, T., Romashkin, P., Saiz-Lopez, A., Schauffler, S., Shieh, O., Stell, M.H., Ullmann, K., Vaughan, G., Volkamer, R., and Wolfe, G.
- Abstract
descripción no proporcionada por scopus
- Published
- 2017
9. On the formation of sulphuric acid – Amine clusters in varying atmospheric conditions and its influence on atmospheric new particle formation
- Author
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Paasonen, P., Olenius, T., Kupiainen, O., Kurtén, T., Petäjä, T., Birmili, W., Hamed, A., Hu, M., Huey, L.G., Plass-Duelmer, C., Smith, J.N., Wiedensohler, A., Loukonen, V., McGrath, M.J., Ortega, I.K., Laaksonen, A., Vehkamäki, H., Kerminen, V.-M., and Kulmala, M.
- Subjects
air temperature ,atmospheric chemistry ,concentration (composition) ,sulfuric acid ,modeling ,relative humidity - Abstract
Sulphuric acid is a key component in atmospheric new particle formation. However, sulphuric acid alone does not form stable enough clusters to initiate particle formation in atmospheric conditions. Strong bases, such as amines, have been suggested to stabilize sulphuric acid clusters and thus participate in particle formation. We modelled the formation rate of clusters with two sulphuric acid and two amine molecules (JA2B2) at varying atmospherically relevant conditions with respect to concentrations of sulphuric acid ([H2SO4]), dimethylamine ([DMA]) and trimethylamine ([TMA]), temperature and relative humidity (RH). We also tested how the model results change if we assume that the clusters with two sulphuric acid and two amine molecules would act as seeds for heterogeneous nucleation of organic vapours (other than amines) with higher atmospheric concentrations than sulphuric acid. The modelled formation rates JA2B2 were functions of sulphuric acid concentration with close to quadratic dependence, which is in good agreement with atmospheric observations of the connection between the particle formation rate and sulphuric acid concentration. The coefficients KA2B2 connecting the cluster formation rate and sulphuric acid concentrations as JA2B2=KA2B2[H2SO4]2 turned out to depend also on amine concentrations, temperature and relative humidity. We compared the modelled coefficients KA2B2 with the corresponding coefficients calculated from the atmospheric observations (Kobs) from environments with varying temperatures and levels of anthropogenic influence. By taking into account the modelled behaviour of JA2B2 as a function of [H2SO4], temperature and RH, the atmospheric particle formation rate was reproduced more closely than with the traditional semi-empirical formulae based on sulphuric acid concentration only. The formation rates of clusters with two sulphuric acid and two amine molecules with different amine compositions (DMA or TMA or one of both) had different responses to varying meteorological conditions and concentrations of vapours participating in particle formation. The observed inverse proportionality of the coefficient Kobs with RH and temperature agreed best with the modelled coefficient KA2B2 related to formation of a cluster with two H2SO4 and one or two TMA molecules, assuming that these clusters can grow in collisions with abundant organic vapour molecules. In case this assumption is valid, our results suggest that the formation rate of clusters with at least two of both sulphuric acid and amine molecules might be the rate-limiting step for atmospheric particle formation. More generally, our analysis elucidates the sensitivity of the atmospheric particle formation rate to meteorological variables and concentrations of vapours participating in particle formation (also other than H2SO4).
- Published
- 2012
- Full Text
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10. Observations of hydroxyl and peroxy radicals and the impact of Br0 at Summit, Greenland in 2007 and 2008
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Liao, J., Huey, L.G., Tanner, D.J., Brough, Neil, Brooks, S., Dibb, J.E., Stutz, J., Thomas, J.L., Lefer, B., Haman, C., and Gorham, K.
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Atmospheric Sciences - Abstract
The Greenland Summit Halogen-HO(x) (GSHOX) Campaign was performed in spring 2007 and summer 2008 to investigate the impact of halogens on HO(x) (= OH+HO(2)) cycling above the Greenland Ice Sheet. Chemical species including hydroxyl and peroxy radicals (OH and HO(2) + RO(2)), ozone (O(3)), nitrogen oxide (NO), nitric acid (HNO(3)), nitrous acid (HONO), reactive gaseous mercury (RGM), and bromine oxide (BrO) were measured during the campaign. The median midday values of HO(2) + RO(2) and OH concentrations observed by chemical ionization mass spectrometry (CIMS) were 2.7x10(8) molec cm(-3) and 3.0x10(6) molec cm(-3) in spring 2007, and 4.2x10(8) molec cm(-3) and 4.1x10(6) molec cm(-3) in summer 2008. A basic photochemical 0-D box model highly constrained by observations of H(2)O, O(3), CO, CH(4), NO, and J values predicted HO(2) + RO(2) (R = 0.90, slope = 0.87 in 2007; R = 0.79, slope = 0.96 in 2008) reasonably well and under predicted OH (R = 0.83, slope = 0.72 in 2007; R = 0.76, slope = 0.54 in 2008). Constraining the model to HONO observations did not significantly improve the ratio of OH to HO(2) + RO(2) and the correlation between predictions and observations. Including bromine chemistry in the model constrained by observations of BrO improved the correlation between observed and predicted HO(2) + RO(2) and OH, and brought the average hourly OH and HO(2) + RO(2) predictions closer to the observations. These model comparisons confirmed our understanding of the dominant HO(x) sources and sinks in this environment and indicated that BrO impacted the OH levels at Summit. Although, significant discrepancies between observed and predicted OH could not be explained by the measured BrO. Finally, observations of enhanced RGM were found to be coincident with under prediction of OH.
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- 2011
11. Analysis of satellite-derived Arctic tropospheric BrO columns in conjunction with aircraft measurements during ARCTAS and ARCPAC
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Choi, S., Wang, Y., Salawitch, R.J., Canty, T., Joiner, J., Zeng, T., Kurosu, T.P., Chance, K., Richter, A., Huey, L.G., Liao, J., Neuman, J.A., Nowak, J.B., Dibb, J.E., Weinheimer, A.J., Diskin, G., Ryerson, T.B., Silva, da, A., Curry, J., Kinnison, D., Tilmes, S., Levelt, P.F., Choi, S., Wang, Y., Salawitch, R.J., Canty, T., Joiner, J., Zeng, T., Kurosu, T.P., Chance, K., Richter, A., Huey, L.G., Liao, J., Neuman, J.A., Nowak, J.B., Dibb, J.E., Weinheimer, A.J., Diskin, G., Ryerson, T.B., Silva, da, A., Curry, J., Kinnison, D., Tilmes, S., and Levelt, P.F.
- Abstract
We derive tropospheric column BrO during the ARCTAS and ARCPAC field campaigns in spring 2008 using retrievals of total column BrO from the satellite UV nadir sensors OMI and GOME-2 using a radiative transfer model and stratospheric column BrO from a photochemical simulation. We conduct a comprehensive comparison of satellite-derived tropospheric BrO column to aircraft in-situ observations of BrO and related species. The aircraft profiles reveal that tropospheric BrO, when present during April 2008, was distributed over a broad range of altitudes rather than being confined to the planetary boundary layer (PBL). Perturbations to the total column resulting from tropospheric BrO are the same magnitude as perturbations due to longitudinal variations in the stratospheric component, so proper accounting of the stratospheric signal is essential for accurate determination of satellite-derived tropospheric BrO. We find reasonably good agreement between satellite-derived tropospheric BrO and columns found using aircraft in-situ BrO profiles, particularly when satellite radiances were obtained over bright surfaces (albedo >0.7), for solar zenith angle
- Published
- 2012
12. Evaluation and improvements of two community models in simulating dry deposition velocities for peroxyacetyl nitrate (PAN) over a coniferous forest
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Wu, Zhiyong, Wang, Xuemei, Turnipseed, Andrew A., Chen, Fei, Zhang, Leiming, Guenther, Alex B., Karl, Thomas, Huey, L.G., Niyogi, Dev, Xia, Beicheng, Alapaty, Kiran, Wu, Zhiyong, Wang, Xuemei, Turnipseed, Andrew A., Chen, Fei, Zhang, Leiming, Guenther, Alex B., Karl, Thomas, Huey, L.G., Niyogi, Dev, Xia, Beicheng, and Alapaty, Kiran
- Abstract
Dry deposition velocities (Vd) for peroxyacetyl nitrate (PAN) calculated using two community dry deposition models with different treatments of both stomatal and nonstomatal uptakes were evaluated using measurements of PAN eddy covariance fluxes over a Loblolly pine forest in July 2003. The observed daytime maximum of Vd(PAN) was ∼1.0 cm s-1 on average, while the estimates by the WRF-Chem dry deposition module (WDDM) and the Noah land surface model coupled with a photosynthesis-based Gas Exchange Model (Noah-GEM) were only 0.2 cm s-1 and 0.6 cm s-1, respectively. The observations also showed considerable PAN deposition at night with typical Vd values of 0.2-0.6 cm s-1, while the estimated values from both models were less than 0.1 cm s-1. Noah-GEM modeled more realistic stomatal resistance (Rs) than WDDM, as compared with observations of water vapor exchange fluxes. The poor performance of WDDM for stomatal uptake is mainly due to its lack of dependence on leaf area index. Thermal decomposition was found to be relatively unimportant for measured PAN fluxes as shown by the lack of a relationship between measured total surface conductance and temperature. Thus, a large part of the underprediction in Vd from both models should be caused by the underestimation of nonstomatal uptake, in particular, the cuticle uptake. Sensitivity tests on both stomatal and nonstomatal resistances terms were conducted and some recommendations were provided. Copyright 2012 by the American Geophysical Union.
- Published
- 2012
13. An assessment of the polar HOx photochemical budget based on 2003 Summit Greenland field observations
- Author
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Chen, G., Huey, L.G., Crawford, J.H., Olson, J.R., Hutterli, Manuel, Sjostedt, S., Tanner, D., Dibb, J., Lefer, B., Blake, N., Davis, Douglas, Stohl, A., Chen, G., Huey, L.G., Crawford, J.H., Olson, J.R., Hutterli, Manuel, Sjostedt, S., Tanner, D., Dibb, J., Lefer, B., Blake, N., Davis, Douglas, and Stohl, A.
- Abstract
An interpretative modeling analysis is conducted to simulate the diurnal variations in OH and HO2 + RO2 observed at Summit, Greenland in 2003. The main goal is to assess the HOx budget and to quantify the impact of snow emissions on ambient HOx as well as on CH2O and H2O2. This analysis is based on composite diurnal profiles of HOx precursors recorded during a 3-day period (July 7-9), which were generally compatible with values reported in earlier studies. The model simulations can reproduce the observed diurnal variation in HO2 + RO2 when they are constrained by observations of H2O2 and CH2O. By contrast, model predictions of OH were about factor of 2 higher than the observed values. Modeling analysis of H2O2 suggests that its distinct diurnal variation is likely controlled by snow emissions and loss by deposition and/or scavenging. Similarly, deposition and/or scavenging sinks are needed to reproduce the observed diel profile in CH2O. This study suggests that for the Summit 2003 period snow emissions contribute similar to 25% of the total CH2O production, while photochemical oxidation of hydrocarbon appears to be the dominant source. A budget assessment of HOx radicals shows that primary production from O(D-1) + H2O and photolysis of snow emitted precursors (i.e., H2O2 and CH2O)are the largest primary HOx sources at Summit, contributing 41% and 40%, respectively. The snow contribution to the HOx budget is mostly in the form of emissions of H2O2. The dominant HO, sink involves the HO2 + HO2 reaction forming H2O2, followed by its deposition to snow. These results differ from those previously reported for the South Pole (SP), in that primary production of HOx was shown to be largely driven by both the photolysis of CH2O and H2O2 emissions (46%) with smaller contributions coming from the oxidation of CH4 and the 0(D-1) + H2O reaction (i.e., 27% each). In sharp contrast to the findings at Summit in 2003, due to the much higher levels of NOx the SP HO, sinks are dominat
- Published
- 2007
14. An overview of snow photochemistry: evidence, mechanisms and impacts
- Author
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Grannas, A.M., Jones, Anna E., Dibb, J., Ammann, M., Anastasio, C., Beine, H.J., Bergin, M., Bottenheim, J., Boxe, C.S., Carver, G., Chen, G., Crawford, J.H., Dominé, F., Frey, M.M., Guzmán, M.I., Heard, D.E., Helmig, D., Hoffmann, M.R., Honarth, R.E., Huey, L.G., Hutterli, Manuel, Jacobi, H.W., Klán, P., Lefer, B., McConnell, J., Plane, J., Sander, R., Savarino, J., Shepson, P.B., Simpson, W.R., Sodeau, J.R., von Glasow, R., Weller, R., Wolff, Eric W., Zhu, T., Grannas, A.M., Jones, Anna E., Dibb, J., Ammann, M., Anastasio, C., Beine, H.J., Bergin, M., Bottenheim, J., Boxe, C.S., Carver, G., Chen, G., Crawford, J.H., Dominé, F., Frey, M.M., Guzmán, M.I., Heard, D.E., Helmig, D., Hoffmann, M.R., Honarth, R.E., Huey, L.G., Hutterli, Manuel, Jacobi, H.W., Klán, P., Lefer, B., McConnell, J., Plane, J., Sander, R., Savarino, J., Shepson, P.B., Simpson, W.R., Sodeau, J.R., von Glasow, R., Weller, R., Wolff, Eric W., and Zhu, T.
- Abstract
It has been shown that sunlit snow and ice plays an important role in processing atmospheric species. Photochemical production of a variety of chemicals has recently been reported to occur in snow/ice and the release of these photochemically generated species may significantly impact the chemistry of the overlying atmosphere. Nitrogen oxide and oxidant precursor fluxes have been measured in a number of snow covered environments, where in some cases the emissions significantly impact the overlying boundary layer. For example, photochemical ozone production (such as that occurring in polluted mid-latitudes) of 3–4 ppbv/day has been observed at South Pole, due to high OH and NO levels present in a relatively shallow boundary layer. Field and laboratory experiments have determined that the origin of the observed NOx flux is the photochemistry of nitrate within the snowpack, however some details of the mechanism have not yet been elucidated. A variety of low molecular weight organic compounds have been shown to be emitted from sunlit snowpacks, the source of which has been proposed to be either direct or indirect photo-oxidation of natural organic materials present in the snow. Although myriad studies have observed active processing of species within irradiated snowpacks, the fundamental chemistry occurring remains poorly understood. Here we consider the nature of snow at a fundamental, physical level; photochemical processes within snow and the caveats needed for comparison to atmospheric photochemistry; our current understanding of nitrogen, oxidant, halogen and organic photochemistry within snow; the current limitations faced by the field and implications for the future.
- Published
- 2007
15. Kinetics of the HO2 + NO2 Reaction: On the impact of new gas-phase kinetic data for the formation of HO2NO2 on HOx, NOx and HO2NO2 levels in the troposphere
- Author
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Bacak, A., primary, Cooke, M.C., additional, Bardwell, M.W., additional, McGillen, M.R., additional, Archibald, A.T., additional, Huey, L.G., additional, Tanner, D., additional, Utembe, S.R., additional, Jenkin, M.E., additional, Derwent, R.G., additional, Shallcross, D.E., additional, and Percival, C.J., additional
- Published
- 2011
- Full Text
- View/download PDF
16. An assessment of the polar HOx photochemical budget based on 2003 Summit Greenland field observations
- Author
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Chen, G., primary, Huey, L.G., additional, Crawford, J.H., additional, Olson, J.R., additional, Hutterli, M.A., additional, Sjostedt, S., additional, Tanner, D., additional, Dibb, J., additional, Lefer, B., additional, Blake, N., additional, Davis, Douglas, additional, and Stohl, A., additional
- Published
- 2007
- Full Text
- View/download PDF
17. Study of inlet materials for sampling atmospheric nitric acid.
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Neuman, J.A. and Huey, L.G.
- Subjects
- *
ADSORPTION (Chemistry) , *NITRIC acid , *POLYTEF , *MASS spectrometers , *SCIENTIFIC experimentation - Abstract
Analyzes the adsorption of nitric acid from a flowing gas stream for a variety of wall materials to determine its suitability for use in atmospheric sampling instruments. Use of a fast response time chemical ionization mass spectrometer in the experiment; Determination of Teflonas the optimal choice for inlet surfaces used for in situ measurements of nitric acid.
- Published
- 1999
- Full Text
- View/download PDF
18. Transpacific Transport of Ozone Pollution and the Effect of Recent Asian Emission Increases on Air Quality in North America: An Integrated Analysis Using Satellite, Aircraft, Ozonesonde, and Surface Observations
- Author
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Zhang, Lin, Jacob, Daniel, Boersma, K.F., Jaffe, D.A., Olson, J.R., Bowman, K.W., Worden, J.R., Thompson, A.M., Avery, M.A., Cohen, R.C., Dibb, J.E., Flock, F.M., Fuelberg, H.E., Huey, L.G., McMillan, W.W., Singh, H.B., and Weinheimer, A.J.
- Abstract
We use an ensemble of aircraft, satellite, sonde, and surface observations for April–May 2006 (NASA/INTEX-B aircraft campaign) to better understand the mechanisms for transpacific ozone pollution and its implications for North American air quality. The observations are interpreted with a global 3-D chemical transport model (GEOS-Chem). OMI NO2 satellite observations constrain Asian anthropogenic NOx emissions and indicate a factor of 2 increase from 2000 to 2006 in China. Satellite observations of CO from AIRS and TES indicate two major events of Asian transpacific pollution during INTEX-B. Correlation between TES CO and ozone observations shows evidence for transpacific ozone pollution. The semi-permanent Pacific High and Aleutian Low cause splitting of transpacific pollution plumes over the Northeast Pacific. The northern branch circulates around the Aleutian Low and has little impact on North America. The southern branch circulates around the Pacific High and some of that air impacts western North America. Both aircraft measurements and model results show sustained ozone production driven by peroxyacetylnitrate (PAN) decomposition in the southern branch, roughly doubling the transpacific influence from ozone produced in the Asian boundary layer. Model simulation of ozone observations at Mt. Bachelor Observatory in Oregon (2.7 km altitude) indicates a mean Asian ozone pollution contribution of 9±3 ppbv to the mean observed concentration of 54 ppbv, reflecting mostly an enhancement in background ozone rather than episodic Asian plumes. Asian pollution enhanced surface ozone concentrations by 5–7 ppbv over western North America in spring 2006. The 2000–2006 rise in Asian anthropogenic emissions increased this influence by 1–2 ppbv., Earth and Planetary Sciences, Engineering and Applied Sciences, Version of Record
- Published
- 2008
19. Observations of Ozone Formation in Power Plant Plumes and Implications for Ozone Control Strategies.
- Author
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Ryerson, T.B., Trainer, M., Holloway, J.S., Parrish, D.D., Huey, L.G., Sueper, D.T., Frost, G.J., Donnelly, S.G., Schauffler, S., Atlas, E.L., Kuster, W.C., Goldan, P.D., Hubler, G., Meagher, J.F., and Fehsenfeld, F.C.
- Subjects
- *
ATMOSPHERIC ozone , *SMOKE plumes , *COAL-fired power plants , *POLLUTION - Abstract
Examines the nonlinear dependence of tropospheric ozone formation on emission plumes from coal-fired power plants in the United States. Determination of plume concentration; Modulation of ozone production rate and yield; Implications for future ozone control strategies.
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- 2001
- Full Text
- View/download PDF
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