Springtime photochemistry at northern mid and high latitudes
Physical and chemical properties of the atmosphere at 0–8 km were measured during the Tropospheric Ozone Production about the Spring Equinox (TOPSE) experiments from February to May 2000 at mid (40°–60°N) and high latitudes (60°–80°N). The observations were analyzed using a diel steady state box mod...
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ftunivrhodeislan:oai:digitalcommons.uri.edu:gsofacpubs-1365 2023-07-30T04:07:19+02:00 Springtime photochemistry at northern mid and high latitudes Wang, Yuhang Ridley, Brian Fried, Alan Cantrell, Christopher Davis, Douglas Chen, Gao Snow, Julie Heikes, Brian G. Talbot, Robert Dibb, Jack Flocke, Frank Weinheimer, Andrew Blake, Nicola Blake, Donald Shetter, Richard Lefer, Barry Atlas, Elliot Coffey, Michael Walega, Jim Wert, Brian 2003-01-01T08:00:00Z application/pdf https://digitalcommons.uri.edu/gsofacpubs/353 https://doi.org/10.1029/2002JD002227 https://digitalcommons.uri.edu/context/gsofacpubs/article/1365/viewcontent/Snow_Heikes_Springtime_2003.pdf unknown DigitalCommons@URI https://digitalcommons.uri.edu/gsofacpubs/353 doi:10.1029/2002JD002227 https://digitalcommons.uri.edu/context/gsofacpubs/article/1365/viewcontent/Snow_Heikes_Springtime_2003.pdf Graduate School of Oceanography Faculty Publications text 2003 ftunivrhodeislan https://doi.org/10.1029/2002JD002227 2023-07-17T18:56:45Z Physical and chemical properties of the atmosphere at 0–8 km were measured during the Tropospheric Ozone Production about the Spring Equinox (TOPSE) experiments from February to May 2000 at mid (40°–60°N) and high latitudes (60°–80°N). The observations were analyzed using a diel steady state box model to examine HOx and O3 photochemistry during the spring transition period. The radical chemistry is driven primarily by photolysis of O3 and the subsequent reaction of O(1D) and H2O, the rate of which increases rapidly during spring. Unlike in other tropospheric experiments, observed H2O2 concentrations are a factor of 2–10 lower than those simulated by the model. The required scavenging timescale to reconcile the model overestimates shows a rapid seasonal decrease down to 0.5–1 day in May, which cannot be explained by known mechanisms. This loss of H2O2 implies a large loss of HOx resulting in decreases in O3 production (10–20%) and OH concentrations (20–30%). Photolysis of CH2O, either transported into the region or produced by unknown chemical pathways, appears to provide a significant HOx source at 6–8 km at high latitudes. The rapid increase of in situ O3 production in spring is fueled by concurrent increases of the primary HOx production and NO concentrations. Long‐lived reactive nitrogen species continue to accumulate at mid and high latitudes in spring. There is a net loss of NOx to HNO3 and PAN throughout the spring, suggesting that these long‐term NOx reservoirs do not provide a net source for NOx in the region. In situ O3 chemical loss is dominated by the reaction of O3 and HO2, and not that of O(1D) and H2O. At midlatitudes, there is net in situ chemical production of O3 from February to May. The lower free troposphere (1–4 km) is a region of significant net O3 production. The net production peaks in April coinciding with the observed peak of column O3 (0–8 km). The net in situ O3 production at midlatitudes can explain much of the observed column O3 increase, although it alone cannot explain the observed ... Text Tropospheric Ozone Production About the Spring Equinox University of Rhode Island: DigitalCommons@URI Journal of Geophysical Research 108 D4 |
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Open Polar |
collection |
University of Rhode Island: DigitalCommons@URI |
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ftunivrhodeislan |
language |
unknown |
description |
Physical and chemical properties of the atmosphere at 0–8 km were measured during the Tropospheric Ozone Production about the Spring Equinox (TOPSE) experiments from February to May 2000 at mid (40°–60°N) and high latitudes (60°–80°N). The observations were analyzed using a diel steady state box model to examine HOx and O3 photochemistry during the spring transition period. The radical chemistry is driven primarily by photolysis of O3 and the subsequent reaction of O(1D) and H2O, the rate of which increases rapidly during spring. Unlike in other tropospheric experiments, observed H2O2 concentrations are a factor of 2–10 lower than those simulated by the model. The required scavenging timescale to reconcile the model overestimates shows a rapid seasonal decrease down to 0.5–1 day in May, which cannot be explained by known mechanisms. This loss of H2O2 implies a large loss of HOx resulting in decreases in O3 production (10–20%) and OH concentrations (20–30%). Photolysis of CH2O, either transported into the region or produced by unknown chemical pathways, appears to provide a significant HOx source at 6–8 km at high latitudes. The rapid increase of in situ O3 production in spring is fueled by concurrent increases of the primary HOx production and NO concentrations. Long‐lived reactive nitrogen species continue to accumulate at mid and high latitudes in spring. There is a net loss of NOx to HNO3 and PAN throughout the spring, suggesting that these long‐term NOx reservoirs do not provide a net source for NOx in the region. In situ O3 chemical loss is dominated by the reaction of O3 and HO2, and not that of O(1D) and H2O. At midlatitudes, there is net in situ chemical production of O3 from February to May. The lower free troposphere (1–4 km) is a region of significant net O3 production. The net production peaks in April coinciding with the observed peak of column O3 (0–8 km). The net in situ O3 production at midlatitudes can explain much of the observed column O3 increase, although it alone cannot explain the observed ... |
format |
Text |
author |
Wang, Yuhang Ridley, Brian Fried, Alan Cantrell, Christopher Davis, Douglas Chen, Gao Snow, Julie Heikes, Brian G. Talbot, Robert Dibb, Jack Flocke, Frank Weinheimer, Andrew Blake, Nicola Blake, Donald Shetter, Richard Lefer, Barry Atlas, Elliot Coffey, Michael Walega, Jim Wert, Brian |
spellingShingle |
Wang, Yuhang Ridley, Brian Fried, Alan Cantrell, Christopher Davis, Douglas Chen, Gao Snow, Julie Heikes, Brian G. Talbot, Robert Dibb, Jack Flocke, Frank Weinheimer, Andrew Blake, Nicola Blake, Donald Shetter, Richard Lefer, Barry Atlas, Elliot Coffey, Michael Walega, Jim Wert, Brian Springtime photochemistry at northern mid and high latitudes |
author_facet |
Wang, Yuhang Ridley, Brian Fried, Alan Cantrell, Christopher Davis, Douglas Chen, Gao Snow, Julie Heikes, Brian G. Talbot, Robert Dibb, Jack Flocke, Frank Weinheimer, Andrew Blake, Nicola Blake, Donald Shetter, Richard Lefer, Barry Atlas, Elliot Coffey, Michael Walega, Jim Wert, Brian |
author_sort |
Wang, Yuhang |
title |
Springtime photochemistry at northern mid and high latitudes |
title_short |
Springtime photochemistry at northern mid and high latitudes |
title_full |
Springtime photochemistry at northern mid and high latitudes |
title_fullStr |
Springtime photochemistry at northern mid and high latitudes |
title_full_unstemmed |
Springtime photochemistry at northern mid and high latitudes |
title_sort |
springtime photochemistry at northern mid and high latitudes |
publisher |
DigitalCommons@URI |
publishDate |
2003 |
url |
https://digitalcommons.uri.edu/gsofacpubs/353 https://doi.org/10.1029/2002JD002227 https://digitalcommons.uri.edu/context/gsofacpubs/article/1365/viewcontent/Snow_Heikes_Springtime_2003.pdf |
genre |
Tropospheric Ozone Production About the Spring Equinox |
genre_facet |
Tropospheric Ozone Production About the Spring Equinox |
op_source |
Graduate School of Oceanography Faculty Publications |
op_relation |
https://digitalcommons.uri.edu/gsofacpubs/353 doi:10.1029/2002JD002227 https://digitalcommons.uri.edu/context/gsofacpubs/article/1365/viewcontent/Snow_Heikes_Springtime_2003.pdf |
op_doi |
https://doi.org/10.1029/2002JD002227 |
container_title |
Journal of Geophysical Research |
container_volume |
108 |
container_issue |
D4 |
_version_ |
1772820556101451776 |