Unexplained enhancements of CH3Br in the Arctic and sub-Arctic lower troposphere during TOPSE spring 2000
Elevated concentrations of methyl bromide (CH3Br) were observed in the Arctic atmospheric boundary layer (BL) during periods of widespread BL ozone (O3) depletion episodes (ODEs: O3 mixing ratios < 20 × 10-9 or parts per billion by volume, ppbv) particularly during major ODEs (MODES: O3 < 4 pp...
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ftcdlib:oai:escholarship.org/ark:/13030/qt5606t08j 2023-05-15T14:47:03+02:00 Unexplained enhancements of CH3Br in the Arctic and sub-Arctic lower troposphere during TOPSE spring 2000 Wingenter, OW Sive, BC Blake, DR Rowland, FS Ridley, BA 2003-11-15 application/pdf https://escholarship.org/uc/item/5606t08j unknown eScholarship, University of California qt5606t08j https://escholarship.org/uc/item/5606t08j CC-BY CC-BY Geophysical Research Letters, vol 30, iss 22 Meteorology & Atmospheric Sciences article 2003 ftcdlib 2021-06-20T14:23:05Z Elevated concentrations of methyl bromide (CH3Br) were observed in the Arctic atmospheric boundary layer (BL) during periods of widespread BL ozone (O3) depletion episodes (ODEs: O3 mixing ratios < 20 × 10-9 or parts per billion by volume, ppbv) particularly during major ODEs (MODES: O3 < 4 ppbv). No other organic gases measured during TOPSE (Tropospheric Ozone Production about the Spring Equinox) exhibited anti-correlations with O3 during these ODEs. Methyl bromide has both natural and anthropogenic sources and contributes ∼ half of the bromine (Br) to the stratosphere, where it can catalytically destroy O3. Several known CH3Br sources are evaluated, but the current knowledge cannot explain the observed enhancements. If the mechanism is direct gasphase photochemical production, a significant portion of the unknown CH3Br source may be found. Article in Journal/Newspaper Arctic Tropospheric Ozone Production About the Spring Equinox University of California: eScholarship Arctic |
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University of California: eScholarship |
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ftcdlib |
language |
unknown |
topic |
Meteorology & Atmospheric Sciences |
spellingShingle |
Meteorology & Atmospheric Sciences Wingenter, OW Sive, BC Blake, DR Rowland, FS Ridley, BA Unexplained enhancements of CH3Br in the Arctic and sub-Arctic lower troposphere during TOPSE spring 2000 |
topic_facet |
Meteorology & Atmospheric Sciences |
description |
Elevated concentrations of methyl bromide (CH3Br) were observed in the Arctic atmospheric boundary layer (BL) during periods of widespread BL ozone (O3) depletion episodes (ODEs: O3 mixing ratios < 20 × 10-9 or parts per billion by volume, ppbv) particularly during major ODEs (MODES: O3 < 4 ppbv). No other organic gases measured during TOPSE (Tropospheric Ozone Production about the Spring Equinox) exhibited anti-correlations with O3 during these ODEs. Methyl bromide has both natural and anthropogenic sources and contributes ∼ half of the bromine (Br) to the stratosphere, where it can catalytically destroy O3. Several known CH3Br sources are evaluated, but the current knowledge cannot explain the observed enhancements. If the mechanism is direct gasphase photochemical production, a significant portion of the unknown CH3Br source may be found. |
format |
Article in Journal/Newspaper |
author |
Wingenter, OW Sive, BC Blake, DR Rowland, FS Ridley, BA |
author_facet |
Wingenter, OW Sive, BC Blake, DR Rowland, FS Ridley, BA |
author_sort |
Wingenter, OW |
title |
Unexplained enhancements of CH3Br in the Arctic and sub-Arctic lower troposphere during TOPSE spring 2000 |
title_short |
Unexplained enhancements of CH3Br in the Arctic and sub-Arctic lower troposphere during TOPSE spring 2000 |
title_full |
Unexplained enhancements of CH3Br in the Arctic and sub-Arctic lower troposphere during TOPSE spring 2000 |
title_fullStr |
Unexplained enhancements of CH3Br in the Arctic and sub-Arctic lower troposphere during TOPSE spring 2000 |
title_full_unstemmed |
Unexplained enhancements of CH3Br in the Arctic and sub-Arctic lower troposphere during TOPSE spring 2000 |
title_sort |
unexplained enhancements of ch3br in the arctic and sub-arctic lower troposphere during topse spring 2000 |
publisher |
eScholarship, University of California |
publishDate |
2003 |
url |
https://escholarship.org/uc/item/5606t08j |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Tropospheric Ozone Production About the Spring Equinox |
genre_facet |
Arctic Tropospheric Ozone Production About the Spring Equinox |
op_source |
Geophysical Research Letters, vol 30, iss 22 |
op_relation |
qt5606t08j https://escholarship.org/uc/item/5606t08j |
op_rights |
CC-BY |
op_rightsnorm |
CC-BY |
_version_ |
1766318190587019264 |