Analysis of the latitudinal variability of tropospheric ozone in the Arctic using the large number of aircraft and ozonesonde observations in early summer 2008
During the 2008 International Polar Year, the POLARCAT (Polar Study using Aircraft, Remote Sensing, Surface Measurements, and Models of Climate Chemistry, Aerosols, and Transport) campaign, conducted in summer over Greenland and Canada, produced a large number of measurements from three aircraft and...
Published in: | Atmospheric Chemistry and Physics |
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Online Access: | https://doi.org/10.5194/acp-16-13341-2016 https://www.atmos-chem-phys.net/16/13341/2016/ |
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ftcopernicus:oai:publications.copernicus.org:acp51449 2023-05-15T15:05:52+02:00 Analysis of the latitudinal variability of tropospheric ozone in the Arctic using the large number of aircraft and ozonesonde observations in early summer 2008 Ancellet, Gerard Daskalakis, Nikos Raut, Jean Christophe Tarasick, David Hair, Jonathan Quennehen, Boris Ravetta, François Schlager, Hans Weinheimer, Andrew J. Thompson, Anne M. Johnson, Bryan Thomas, Jennie L. Law, Katharine S. 2018-09-17 info:eu-repo/semantics/application/pdf https://doi.org/10.5194/acp-16-13341-2016 https://www.atmos-chem-phys.net/16/13341/2016/ eng eng info:eu-repo/grantAgreement/EC/FP7/603887 doi:10.5194/acp-16-13341-2016 https://www.atmos-chem-phys.net/16/13341/2016/ info:eu-repo/semantics/openAccess eISSN: 1680-7324 info:eu-repo/semantics/Text 2018 ftcopernicus https://doi.org/10.5194/acp-16-13341-2016 2019-12-24T09:51:52Z During the 2008 International Polar Year, the POLARCAT (Polar Study using Aircraft, Remote Sensing, Surface Measurements, and Models of Climate Chemistry, Aerosols, and Transport) campaign, conducted in summer over Greenland and Canada, produced a large number of measurements from three aircraft and seven ozonesonde stations. Here we present an observation-integrated analysis based on three different types of O 3 measurements: airborne lidar, airborne UV absorption or chemiluminescence measurement, and intensified electrochemical concentration cell (ECC) ozonesonde profiles. Discussion of the latitudinal and vertical variability of tropospheric ozone north of 55° N during this period is performed with the aid of a regional model (WFR-Chem). The model is able to reproduce the O 3 latitudinal and vertical variability but with a negative O 3 bias of 6–15 ppbv in the free troposphere above 4 km, especially over Canada. For Canada, large average CO concentrations in the free troposphere above 4 km ( > 130 ppbv) and the weak correlation (< 30 %) of O 3 and PV suggest that stratosphere–troposphere exchange (STE) is not the major contributor to average tropospheric ozone at latitudes less than 70° N, due to the fact that local biomass burning (BB) emissions were significant during the 2008 summer period. Conversely, significant STE is found over Greenland according to the better O 3 vs. PV correlation ( > 40 %) and the higher values of the 75th PV percentile. It is related to the persistence of cyclonic activity during the summer over Baffin Bay. Using differences between average concentration above Northern and Southern Canada, a weak negative latitudinal summer ozone gradient of −6 to −8 ppbv is found in the mid-troposphere between 4 and 8 km. This is attributed to an efficient O 3 photochemical production from BB emissions at latitudes less than 65° N, while the STE contribution is more homogeneous in the latitude range 55–70° N. A positive ozone latitudinal gradient of 12 ppbv is observed in the same altitude range over Greenland not because of an increasing latitudinal influence of STE, but because of different long-range transport from multiple mid-latitude sources (North America, Europe, and even Asia for latitudes higher than 77° N). For the Arctic latitudes (> 80° N), free tropospheric O 3 concentrations during summer 2008 are related to a mixture of Asian pollution and stratospheric O 3 transport across the tropopause. Other/Unknown Material Arctic Baffin Bay Baffin Bay Baffin Greenland International Polar Year Copernicus Publications: E-Journals Arctic Baffin Bay Canada Greenland Atmospheric Chemistry and Physics 16 20 13341 13358 |
institution |
Open Polar |
collection |
Copernicus Publications: E-Journals |
op_collection_id |
ftcopernicus |
language |
English |
description |
During the 2008 International Polar Year, the POLARCAT (Polar Study using Aircraft, Remote Sensing, Surface Measurements, and Models of Climate Chemistry, Aerosols, and Transport) campaign, conducted in summer over Greenland and Canada, produced a large number of measurements from three aircraft and seven ozonesonde stations. Here we present an observation-integrated analysis based on three different types of O 3 measurements: airborne lidar, airborne UV absorption or chemiluminescence measurement, and intensified electrochemical concentration cell (ECC) ozonesonde profiles. Discussion of the latitudinal and vertical variability of tropospheric ozone north of 55° N during this period is performed with the aid of a regional model (WFR-Chem). The model is able to reproduce the O 3 latitudinal and vertical variability but with a negative O 3 bias of 6–15 ppbv in the free troposphere above 4 km, especially over Canada. For Canada, large average CO concentrations in the free troposphere above 4 km ( > 130 ppbv) and the weak correlation (< 30 %) of O 3 and PV suggest that stratosphere–troposphere exchange (STE) is not the major contributor to average tropospheric ozone at latitudes less than 70° N, due to the fact that local biomass burning (BB) emissions were significant during the 2008 summer period. Conversely, significant STE is found over Greenland according to the better O 3 vs. PV correlation ( > 40 %) and the higher values of the 75th PV percentile. It is related to the persistence of cyclonic activity during the summer over Baffin Bay. Using differences between average concentration above Northern and Southern Canada, a weak negative latitudinal summer ozone gradient of −6 to −8 ppbv is found in the mid-troposphere between 4 and 8 km. This is attributed to an efficient O 3 photochemical production from BB emissions at latitudes less than 65° N, while the STE contribution is more homogeneous in the latitude range 55–70° N. A positive ozone latitudinal gradient of 12 ppbv is observed in the same altitude range over Greenland not because of an increasing latitudinal influence of STE, but because of different long-range transport from multiple mid-latitude sources (North America, Europe, and even Asia for latitudes higher than 77° N). For the Arctic latitudes (> 80° N), free tropospheric O 3 concentrations during summer 2008 are related to a mixture of Asian pollution and stratospheric O 3 transport across the tropopause. |
format |
Other/Unknown Material |
author |
Ancellet, Gerard Daskalakis, Nikos Raut, Jean Christophe Tarasick, David Hair, Jonathan Quennehen, Boris Ravetta, François Schlager, Hans Weinheimer, Andrew J. Thompson, Anne M. Johnson, Bryan Thomas, Jennie L. Law, Katharine S. |
spellingShingle |
Ancellet, Gerard Daskalakis, Nikos Raut, Jean Christophe Tarasick, David Hair, Jonathan Quennehen, Boris Ravetta, François Schlager, Hans Weinheimer, Andrew J. Thompson, Anne M. Johnson, Bryan Thomas, Jennie L. Law, Katharine S. Analysis of the latitudinal variability of tropospheric ozone in the Arctic using the large number of aircraft and ozonesonde observations in early summer 2008 |
author_facet |
Ancellet, Gerard Daskalakis, Nikos Raut, Jean Christophe Tarasick, David Hair, Jonathan Quennehen, Boris Ravetta, François Schlager, Hans Weinheimer, Andrew J. Thompson, Anne M. Johnson, Bryan Thomas, Jennie L. Law, Katharine S. |
author_sort |
Ancellet, Gerard |
title |
Analysis of the latitudinal variability of tropospheric ozone in the Arctic using the large number of aircraft and ozonesonde observations in early summer 2008 |
title_short |
Analysis of the latitudinal variability of tropospheric ozone in the Arctic using the large number of aircraft and ozonesonde observations in early summer 2008 |
title_full |
Analysis of the latitudinal variability of tropospheric ozone in the Arctic using the large number of aircraft and ozonesonde observations in early summer 2008 |
title_fullStr |
Analysis of the latitudinal variability of tropospheric ozone in the Arctic using the large number of aircraft and ozonesonde observations in early summer 2008 |
title_full_unstemmed |
Analysis of the latitudinal variability of tropospheric ozone in the Arctic using the large number of aircraft and ozonesonde observations in early summer 2008 |
title_sort |
analysis of the latitudinal variability of tropospheric ozone in the arctic using the large number of aircraft and ozonesonde observations in early summer 2008 |
publishDate |
2018 |
url |
https://doi.org/10.5194/acp-16-13341-2016 https://www.atmos-chem-phys.net/16/13341/2016/ |
geographic |
Arctic Baffin Bay Canada Greenland |
geographic_facet |
Arctic Baffin Bay Canada Greenland |
genre |
Arctic Baffin Bay Baffin Bay Baffin Greenland International Polar Year |
genre_facet |
Arctic Baffin Bay Baffin Bay Baffin Greenland International Polar Year |
op_source |
eISSN: 1680-7324 |
op_relation |
info:eu-repo/grantAgreement/EC/FP7/603887 doi:10.5194/acp-16-13341-2016 https://www.atmos-chem-phys.net/16/13341/2016/ |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/acp-16-13341-2016 |
container_title |
Atmospheric Chemistry and Physics |
container_volume |
16 |
container_issue |
20 |
container_start_page |
13341 |
op_container_end_page |
13358 |
_version_ |
1766337544377597952 |