Polar boundary layer bromine explosion and ozone depletion events in the chemistry–climate model EMAC v2.52: implementation and evaluation of AirSnow algorithm
Ozone depletion events (ODEs) in the polar boundary layer have been observed frequently during springtime. They are related to events of boundary layer enhancement of bromine. Consequently, increased amounts of boundary layer volume mixing ratio (VMR) and vertical column densities (VCDs) of BrO have...
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Online Access: | https://doi.org/10.5194/gmd-11-1115-2018 https://gmd.copernicus.org/articles/11/1115/2018/ |
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ftcopernicus:oai:publications.copernicus.org:gmd59226 2023-05-15T13:55:28+02:00 Polar boundary layer bromine explosion and ozone depletion events in the chemistry–climate model EMAC v2.52: implementation and evaluation of AirSnow algorithm Falk, Stefanie Sinnhuber, Björn-Martin 2019-03-26 application/pdf https://doi.org/10.5194/gmd-11-1115-2018 https://gmd.copernicus.org/articles/11/1115/2018/ eng eng doi:10.5194/gmd-11-1115-2018 https://gmd.copernicus.org/articles/11/1115/2018/ eISSN: 1991-9603 Text 2019 ftcopernicus https://doi.org/10.5194/gmd-11-1115-2018 2020-07-20T16:23:22Z Ozone depletion events (ODEs) in the polar boundary layer have been observed frequently during springtime. They are related to events of boundary layer enhancement of bromine. Consequently, increased amounts of boundary layer volume mixing ratio (VMR) and vertical column densities (VCDs) of BrO have been observed by in situ observation, ground-based as well as airborne remote sensing, and from satellites. These so-called bromine explosion (BE) events have been discussed serving as a source of tropospheric BrO at high latitudes, which has been underestimated in global models so far. We have implemented a treatment of bromine release and recycling on sea-ice- and snow-covered surfaces in the global chemistry–climate model EMAC (ECHAM/MESSy Atmospheric Chemistry) based on the scheme of Toyota et al. ( 2011 ) . In this scheme, dry deposition fluxes of HBr , HOBr , and BrNO 3 over ice- and snow-covered surfaces are recycled into Br 2 fluxes. In addition, dry deposition of O 3 , dependent on temperature and sunlight, triggers a Br 2 release from surfaces associated with first-year sea ice. Many aspects of observed bromine enhancements and associated episodes of near-complete depletion of boundary layer ozone, both in the Arctic and in the Antarctic, are reproduced by this relatively simple approach. We present first results from our global model studies extending over a full annual cycle, including comparisons with Global Ozone Monitoring Experiment (GOME) satellite BrO VCDs and surface ozone observations. Text Antarc* Antarctic Arctic Sea ice Copernicus Publications: E-Journals Antarctic Arctic The Antarctic Geoscientific Model Development 11 3 1115 1131 |
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Open Polar |
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Copernicus Publications: E-Journals |
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ftcopernicus |
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English |
description |
Ozone depletion events (ODEs) in the polar boundary layer have been observed frequently during springtime. They are related to events of boundary layer enhancement of bromine. Consequently, increased amounts of boundary layer volume mixing ratio (VMR) and vertical column densities (VCDs) of BrO have been observed by in situ observation, ground-based as well as airborne remote sensing, and from satellites. These so-called bromine explosion (BE) events have been discussed serving as a source of tropospheric BrO at high latitudes, which has been underestimated in global models so far. We have implemented a treatment of bromine release and recycling on sea-ice- and snow-covered surfaces in the global chemistry–climate model EMAC (ECHAM/MESSy Atmospheric Chemistry) based on the scheme of Toyota et al. ( 2011 ) . In this scheme, dry deposition fluxes of HBr , HOBr , and BrNO 3 over ice- and snow-covered surfaces are recycled into Br 2 fluxes. In addition, dry deposition of O 3 , dependent on temperature and sunlight, triggers a Br 2 release from surfaces associated with first-year sea ice. Many aspects of observed bromine enhancements and associated episodes of near-complete depletion of boundary layer ozone, both in the Arctic and in the Antarctic, are reproduced by this relatively simple approach. We present first results from our global model studies extending over a full annual cycle, including comparisons with Global Ozone Monitoring Experiment (GOME) satellite BrO VCDs and surface ozone observations. |
format |
Text |
author |
Falk, Stefanie Sinnhuber, Björn-Martin |
spellingShingle |
Falk, Stefanie Sinnhuber, Björn-Martin Polar boundary layer bromine explosion and ozone depletion events in the chemistry–climate model EMAC v2.52: implementation and evaluation of AirSnow algorithm |
author_facet |
Falk, Stefanie Sinnhuber, Björn-Martin |
author_sort |
Falk, Stefanie |
title |
Polar boundary layer bromine explosion and ozone depletion events in the chemistry–climate model EMAC v2.52: implementation and evaluation of AirSnow algorithm |
title_short |
Polar boundary layer bromine explosion and ozone depletion events in the chemistry–climate model EMAC v2.52: implementation and evaluation of AirSnow algorithm |
title_full |
Polar boundary layer bromine explosion and ozone depletion events in the chemistry–climate model EMAC v2.52: implementation and evaluation of AirSnow algorithm |
title_fullStr |
Polar boundary layer bromine explosion and ozone depletion events in the chemistry–climate model EMAC v2.52: implementation and evaluation of AirSnow algorithm |
title_full_unstemmed |
Polar boundary layer bromine explosion and ozone depletion events in the chemistry–climate model EMAC v2.52: implementation and evaluation of AirSnow algorithm |
title_sort |
polar boundary layer bromine explosion and ozone depletion events in the chemistry–climate model emac v2.52: implementation and evaluation of airsnow algorithm |
publishDate |
2019 |
url |
https://doi.org/10.5194/gmd-11-1115-2018 https://gmd.copernicus.org/articles/11/1115/2018/ |
geographic |
Antarctic Arctic The Antarctic |
geographic_facet |
Antarctic Arctic The Antarctic |
genre |
Antarc* Antarctic Arctic Sea ice |
genre_facet |
Antarc* Antarctic Arctic Sea ice |
op_source |
eISSN: 1991-9603 |
op_relation |
doi:10.5194/gmd-11-1115-2018 https://gmd.copernicus.org/articles/11/1115/2018/ |
op_doi |
https://doi.org/10.5194/gmd-11-1115-2018 |
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Geoscientific Model Development |
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11 |
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3 |
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1115 |
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1131 |
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