Enhanced tropospheric BrO over Antarctic sea ice in mid winter observed by MAX-DOAS on board the research vessel Polarstern
International audience We present Multi AXis-Differential Optical Absorption Spectroscopy (MAX-DOAS) observations of tropospheric BrO carried out on board the German research vessel Polarstern during the Antarctic winter 2006. Polarstern entered the area of first year sea ice around Antarctica on 24...
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ftinsu:oai:HAL:hal-00296258v1 2023-11-12T04:06:23+01:00 Enhanced tropospheric BrO over Antarctic sea ice in mid winter observed by MAX-DOAS on board the research vessel Polarstern Wagner, T. Ibrahim, O. Sinreich, R. Friess, U. von Glasow, R. Platt, U. Atmospheric Chemistry Department MPIC Max Planck Institute for Chemistry (MPIC) Max-Planck-Gesellschaft-Max-Planck-Gesellschaft Institut für Umweltphysik Heidelberg Universität Heidelberg Heidelberg = Heidelberg University School of Environmental Sciences Norwich University of East Anglia Norwich (UEA) 2007-06-19 https://hal.science/hal-00296258 https://hal.science/hal-00296258/document https://hal.science/hal-00296258/file/acp-7-3129-2007.pdf en eng HAL CCSD European Geosciences Union hal-00296258 https://hal.science/hal-00296258 https://hal.science/hal-00296258/document https://hal.science/hal-00296258/file/acp-7-3129-2007.pdf info:eu-repo/semantics/OpenAccess ISSN: 1680-7316 EISSN: 1680-7324 Atmospheric Chemistry and Physics https://hal.science/hal-00296258 Atmospheric Chemistry and Physics, 2007, 7 (12), pp.3129-3142 [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere info:eu-repo/semantics/article Journal articles 2007 ftinsu 2023-10-25T16:29:29Z International audience We present Multi AXis-Differential Optical Absorption Spectroscopy (MAX-DOAS) observations of tropospheric BrO carried out on board the German research vessel Polarstern during the Antarctic winter 2006. Polarstern entered the area of first year sea ice around Antarctica on 24 June 2006 and stayed within this area until 15 August 2006. For the period when the ship cruised inside the first year sea ice belt, enhanced BrO concentrations were almost continuously observed. Outside the first year sea ice belt, typically low BrO concentrations were found. Based on back trajectory calculations we find a positive correlation between the observed BrO differential slant column densities (?SCDs) and the duration for which the air masses had been in contact with the sea ice surface prior to the measurement. While we can not completely rule out that in several cases the highest BrO concentrations might be located close to the ground, our observations indicate that the maximum BrO concentrations might typically exist in a (possibly extended) layer around the upper edge of the boundary layer. Besides the effect of a decreasing pH of sea salt aerosol with altitude and therefore an increase of BrO with height, this finding might be also related to vertical mixing of air from the free troposphere with the boundary layer, probably caused by convection over the warm ocean surface at polynyas and cracks in the ice. Strong vertical gradients of BrO and O 3 could also explain why we found enhanced BrO levels almost continuously for the observations within the sea ice. Based on our estimated BrO profiles we derive BrO mixing ratios of several ten ppt, which is slightly higher than many existing observations. Our observations indicate that enhanced BrO concentrations around Antarctica exist about one month earlier than observed by satellite instruments. From detailed radiative transfer simulations we find that MAX-DOAS observations are up to about one order of magnitude more sensitive to near-surface BrO than ... Article in Journal/Newspaper Antarc* Antarctic Antarctica Sea ice Institut national des sciences de l'Univers: HAL-INSU Antarctic The Antarctic |
institution |
Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
spellingShingle |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere Wagner, T. Ibrahim, O. Sinreich, R. Friess, U. von Glasow, R. Platt, U. Enhanced tropospheric BrO over Antarctic sea ice in mid winter observed by MAX-DOAS on board the research vessel Polarstern |
topic_facet |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
description |
International audience We present Multi AXis-Differential Optical Absorption Spectroscopy (MAX-DOAS) observations of tropospheric BrO carried out on board the German research vessel Polarstern during the Antarctic winter 2006. Polarstern entered the area of first year sea ice around Antarctica on 24 June 2006 and stayed within this area until 15 August 2006. For the period when the ship cruised inside the first year sea ice belt, enhanced BrO concentrations were almost continuously observed. Outside the first year sea ice belt, typically low BrO concentrations were found. Based on back trajectory calculations we find a positive correlation between the observed BrO differential slant column densities (?SCDs) and the duration for which the air masses had been in contact with the sea ice surface prior to the measurement. While we can not completely rule out that in several cases the highest BrO concentrations might be located close to the ground, our observations indicate that the maximum BrO concentrations might typically exist in a (possibly extended) layer around the upper edge of the boundary layer. Besides the effect of a decreasing pH of sea salt aerosol with altitude and therefore an increase of BrO with height, this finding might be also related to vertical mixing of air from the free troposphere with the boundary layer, probably caused by convection over the warm ocean surface at polynyas and cracks in the ice. Strong vertical gradients of BrO and O 3 could also explain why we found enhanced BrO levels almost continuously for the observations within the sea ice. Based on our estimated BrO profiles we derive BrO mixing ratios of several ten ppt, which is slightly higher than many existing observations. Our observations indicate that enhanced BrO concentrations around Antarctica exist about one month earlier than observed by satellite instruments. From detailed radiative transfer simulations we find that MAX-DOAS observations are up to about one order of magnitude more sensitive to near-surface BrO than ... |
author2 |
Atmospheric Chemistry Department MPIC Max Planck Institute for Chemistry (MPIC) Max-Planck-Gesellschaft-Max-Planck-Gesellschaft Institut für Umweltphysik Heidelberg Universität Heidelberg Heidelberg = Heidelberg University School of Environmental Sciences Norwich University of East Anglia Norwich (UEA) |
format |
Article in Journal/Newspaper |
author |
Wagner, T. Ibrahim, O. Sinreich, R. Friess, U. von Glasow, R. Platt, U. |
author_facet |
Wagner, T. Ibrahim, O. Sinreich, R. Friess, U. von Glasow, R. Platt, U. |
author_sort |
Wagner, T. |
title |
Enhanced tropospheric BrO over Antarctic sea ice in mid winter observed by MAX-DOAS on board the research vessel Polarstern |
title_short |
Enhanced tropospheric BrO over Antarctic sea ice in mid winter observed by MAX-DOAS on board the research vessel Polarstern |
title_full |
Enhanced tropospheric BrO over Antarctic sea ice in mid winter observed by MAX-DOAS on board the research vessel Polarstern |
title_fullStr |
Enhanced tropospheric BrO over Antarctic sea ice in mid winter observed by MAX-DOAS on board the research vessel Polarstern |
title_full_unstemmed |
Enhanced tropospheric BrO over Antarctic sea ice in mid winter observed by MAX-DOAS on board the research vessel Polarstern |
title_sort |
enhanced tropospheric bro over antarctic sea ice in mid winter observed by max-doas on board the research vessel polarstern |
publisher |
HAL CCSD |
publishDate |
2007 |
url |
https://hal.science/hal-00296258 https://hal.science/hal-00296258/document https://hal.science/hal-00296258/file/acp-7-3129-2007.pdf |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Antarc* Antarctic Antarctica Sea ice |
genre_facet |
Antarc* Antarctic Antarctica Sea ice |
op_source |
ISSN: 1680-7316 EISSN: 1680-7324 Atmospheric Chemistry and Physics https://hal.science/hal-00296258 Atmospheric Chemistry and Physics, 2007, 7 (12), pp.3129-3142 |
op_relation |
hal-00296258 https://hal.science/hal-00296258 https://hal.science/hal-00296258/document https://hal.science/hal-00296258/file/acp-7-3129-2007.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1782327470603632640 |