Meteorological mechanisms for transporting O3 over the western North Atlantic Ocean: A case study for August 24-29, 1993
A large-scale view of O3 transport over the western North Atlantic Ocean (WNAO) in summer illustrates distinct sources of O3, and separate transport mechanisms are important at different vertical levels in the troposphere. The week-long period presented covers a sequence of O3 sondes released from B...
Published in: | Journal of Geophysical Research: Atmospheres |
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ftunivrhodeislan:oai:digitalcommons.uri.edu:gsofacpubs-2894 2024-02-04T10:02:28+01:00 Meteorological mechanisms for transporting O3 over the western North Atlantic Ocean: A case study for August 24-29, 1993 Moody, J. L. Davenport, J. C. Merrill, J. T. Oltmans, S. J. Parrish, D. D. Holloway, J. S. Levy, H. Forbes, G. L. Trainer, M. Buhr, M. 1996-12-20T08:00:00Z https://digitalcommons.uri.edu/gsofacpubs/1925 https://doi.org/10.1029/96jd00885 unknown DigitalCommons@URI https://digitalcommons.uri.edu/gsofacpubs/1925 doi:10.1029/96jd00885 https://doi.org/10.1029/96jd00885 Graduate School of Oceanography Faculty Publications text 1996 ftunivrhodeislan https://doi.org/10.1029/96jd00885 2024-01-08T19:09:55Z A large-scale view of O3 transport over the western North Atlantic Ocean (WNAO) in summer illustrates distinct sources of O3, and separate transport mechanisms are important at different vertical levels in the troposphere. The week-long period presented covers a sequence of O3 sondes released from Bermuda and encompasses two surface O3 events in the month-long NARE intensive. O3 and CO peaked at Chebogue Point on the evening of August 25 and after midnight on the morning of August 28. At Sable Island, peaks occurred during early morning of August 26 and late morning of August 28. These events occurred under W-SW winds associated with advancing low-pressure systems that transported anthropogenic pollutants over the WNAO. The concentrations dropped with the passage of a trough or a cold front. Evidence suggests the surface was occasionally isolated from polluted air during favorable transport with pollutants lifted in warm sector flow riding over a wedge of cool, thermodynamically stable air. In addition to surface O3, the O3-sonde profile over Bermuda on the morning of August 27 showed a deep layer of O3 from 6 to 12 km. Using back trajectories and two tracers (isentropic potential vorticity and water vapor), we illustrate that stratospheric ozone exchanged into the upper troposphere in conjunction with surface cyclogenesis was advected through the middle to upper troposphere over the midlatitudes with the potential to reach lower altitudes through subsidence in regions of anticyclonic motion. Text North Atlantic University of Rhode Island: DigitalCommons@URI Journal of Geophysical Research: Atmospheres 101 D22 29213 29227 |
institution |
Open Polar |
collection |
University of Rhode Island: DigitalCommons@URI |
op_collection_id |
ftunivrhodeislan |
language |
unknown |
description |
A large-scale view of O3 transport over the western North Atlantic Ocean (WNAO) in summer illustrates distinct sources of O3, and separate transport mechanisms are important at different vertical levels in the troposphere. The week-long period presented covers a sequence of O3 sondes released from Bermuda and encompasses two surface O3 events in the month-long NARE intensive. O3 and CO peaked at Chebogue Point on the evening of August 25 and after midnight on the morning of August 28. At Sable Island, peaks occurred during early morning of August 26 and late morning of August 28. These events occurred under W-SW winds associated with advancing low-pressure systems that transported anthropogenic pollutants over the WNAO. The concentrations dropped with the passage of a trough or a cold front. Evidence suggests the surface was occasionally isolated from polluted air during favorable transport with pollutants lifted in warm sector flow riding over a wedge of cool, thermodynamically stable air. In addition to surface O3, the O3-sonde profile over Bermuda on the morning of August 27 showed a deep layer of O3 from 6 to 12 km. Using back trajectories and two tracers (isentropic potential vorticity and water vapor), we illustrate that stratospheric ozone exchanged into the upper troposphere in conjunction with surface cyclogenesis was advected through the middle to upper troposphere over the midlatitudes with the potential to reach lower altitudes through subsidence in regions of anticyclonic motion. |
format |
Text |
author |
Moody, J. L. Davenport, J. C. Merrill, J. T. Oltmans, S. J. Parrish, D. D. Holloway, J. S. Levy, H. Forbes, G. L. Trainer, M. Buhr, M. |
spellingShingle |
Moody, J. L. Davenport, J. C. Merrill, J. T. Oltmans, S. J. Parrish, D. D. Holloway, J. S. Levy, H. Forbes, G. L. Trainer, M. Buhr, M. Meteorological mechanisms for transporting O3 over the western North Atlantic Ocean: A case study for August 24-29, 1993 |
author_facet |
Moody, J. L. Davenport, J. C. Merrill, J. T. Oltmans, S. J. Parrish, D. D. Holloway, J. S. Levy, H. Forbes, G. L. Trainer, M. Buhr, M. |
author_sort |
Moody, J. L. |
title |
Meteorological mechanisms for transporting O3 over the western North Atlantic Ocean: A case study for August 24-29, 1993 |
title_short |
Meteorological mechanisms for transporting O3 over the western North Atlantic Ocean: A case study for August 24-29, 1993 |
title_full |
Meteorological mechanisms for transporting O3 over the western North Atlantic Ocean: A case study for August 24-29, 1993 |
title_fullStr |
Meteorological mechanisms for transporting O3 over the western North Atlantic Ocean: A case study for August 24-29, 1993 |
title_full_unstemmed |
Meteorological mechanisms for transporting O3 over the western North Atlantic Ocean: A case study for August 24-29, 1993 |
title_sort |
meteorological mechanisms for transporting o3 over the western north atlantic ocean: a case study for august 24-29, 1993 |
publisher |
DigitalCommons@URI |
publishDate |
1996 |
url |
https://digitalcommons.uri.edu/gsofacpubs/1925 https://doi.org/10.1029/96jd00885 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Graduate School of Oceanography Faculty Publications |
op_relation |
https://digitalcommons.uri.edu/gsofacpubs/1925 doi:10.1029/96jd00885 https://doi.org/10.1029/96jd00885 |
op_doi |
https://doi.org/10.1029/96jd00885 |
container_title |
Journal of Geophysical Research: Atmospheres |
container_volume |
101 |
container_issue |
D22 |
container_start_page |
29213 |
op_container_end_page |
29227 |
_version_ |
1789969176580849664 |