Late summer transition from a free-tropospheric to boundary layer source of Aitken mode aerosol in the high Arctic
In the Arctic, the aerosol budget plays a particular role in determining the behaviour of clouds, which are important for the surface energy balance and thus for the region’s climate. A key question is the extent to which cloud condensation nuclei in the high Arctic summertime boundary layer are con...
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00063273 2023-05-15T14:36:55+02:00 Late summer transition from a free-tropospheric to boundary layer source of Aitken mode aerosol in the high Arctic Price, Ruth Baccarini, Andrea Schmale, Julia Zieger, Paul Brooks, Ian M. Field, Paul Carslaw, Ken S. 2022-11 electronic https://doi.org/10.5194/egusphere-2022-1079 https://noa.gwlb.de/receive/cop_mods_00063273 https://egusphere.copernicus.org/preprints/egusphere-2022-1079/egusphere-2022-1079.pdf eng eng Copernicus Publications https://doi.org/10.5194/egusphere-2022-1079 https://noa.gwlb.de/receive/cop_mods_00063273 https://egusphere.copernicus.org/preprints/egusphere-2022-1079/egusphere-2022-1079.pdf https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/restrictedAccess CC-BY article Verlagsveröffentlichung article Text doc-type:article 2022 ftnonlinearchiv https://doi.org/10.5194/egusphere-2022-1079 2022-11-07T00:12:05Z In the Arctic, the aerosol budget plays a particular role in determining the behaviour of clouds, which are important for the surface energy balance and thus for the region’s climate. A key question is the extent to which cloud condensation nuclei in the high Arctic summertime boundary layer are controlled by local emission and formation processes as opposed to transport from outside. Each of these sources is likely to respond differently to future changes in ice cover. Here we use a global model and observations from ship and aircraft field campaigns to understand the source of high Arctic aerosol in late summer. We find that particles formed remotely, i.e. at lower latitudes, outside the Arctic, are the dominant source of boundary layer Aitken mode particles during the sea ice melt period up to the end of August. Particles from such remote sources, entrained into the boundary layer from the free troposphere, account for nucleation and Aitken mode particle concentrations that are otherwise underestimated by the model. This source from outside the high Arctic declines as photochemical rates decrease towards the end of summer, and is largely replaced by local new particle formation driven by iodic acid emitted from the surface and associated with freeze-up. Such a local source is consistent with strong fluctuations in nucleation mode concentrations that occur in September. Our results suggest a high-Arctic aerosol regime shift in late summer, and only after this shift do cloud condensation nuclei become sensitive to local aerosol processes. Article in Journal/Newspaper Arctic Sea ice Niedersächsisches Online-Archiv NOA Aitken ENVELOPE(-44.516,-44.516,-60.733,-60.733) Arctic |
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Open Polar |
collection |
Niedersächsisches Online-Archiv NOA |
op_collection_id |
ftnonlinearchiv |
language |
English |
topic |
article Verlagsveröffentlichung |
spellingShingle |
article Verlagsveröffentlichung Price, Ruth Baccarini, Andrea Schmale, Julia Zieger, Paul Brooks, Ian M. Field, Paul Carslaw, Ken S. Late summer transition from a free-tropospheric to boundary layer source of Aitken mode aerosol in the high Arctic |
topic_facet |
article Verlagsveröffentlichung |
description |
In the Arctic, the aerosol budget plays a particular role in determining the behaviour of clouds, which are important for the surface energy balance and thus for the region’s climate. A key question is the extent to which cloud condensation nuclei in the high Arctic summertime boundary layer are controlled by local emission and formation processes as opposed to transport from outside. Each of these sources is likely to respond differently to future changes in ice cover. Here we use a global model and observations from ship and aircraft field campaigns to understand the source of high Arctic aerosol in late summer. We find that particles formed remotely, i.e. at lower latitudes, outside the Arctic, are the dominant source of boundary layer Aitken mode particles during the sea ice melt period up to the end of August. Particles from such remote sources, entrained into the boundary layer from the free troposphere, account for nucleation and Aitken mode particle concentrations that are otherwise underestimated by the model. This source from outside the high Arctic declines as photochemical rates decrease towards the end of summer, and is largely replaced by local new particle formation driven by iodic acid emitted from the surface and associated with freeze-up. Such a local source is consistent with strong fluctuations in nucleation mode concentrations that occur in September. Our results suggest a high-Arctic aerosol regime shift in late summer, and only after this shift do cloud condensation nuclei become sensitive to local aerosol processes. |
format |
Article in Journal/Newspaper |
author |
Price, Ruth Baccarini, Andrea Schmale, Julia Zieger, Paul Brooks, Ian M. Field, Paul Carslaw, Ken S. |
author_facet |
Price, Ruth Baccarini, Andrea Schmale, Julia Zieger, Paul Brooks, Ian M. Field, Paul Carslaw, Ken S. |
author_sort |
Price, Ruth |
title |
Late summer transition from a free-tropospheric to boundary layer source of Aitken mode aerosol in the high Arctic |
title_short |
Late summer transition from a free-tropospheric to boundary layer source of Aitken mode aerosol in the high Arctic |
title_full |
Late summer transition from a free-tropospheric to boundary layer source of Aitken mode aerosol in the high Arctic |
title_fullStr |
Late summer transition from a free-tropospheric to boundary layer source of Aitken mode aerosol in the high Arctic |
title_full_unstemmed |
Late summer transition from a free-tropospheric to boundary layer source of Aitken mode aerosol in the high Arctic |
title_sort |
late summer transition from a free-tropospheric to boundary layer source of aitken mode aerosol in the high arctic |
publisher |
Copernicus Publications |
publishDate |
2022 |
url |
https://doi.org/10.5194/egusphere-2022-1079 https://noa.gwlb.de/receive/cop_mods_00063273 https://egusphere.copernicus.org/preprints/egusphere-2022-1079/egusphere-2022-1079.pdf |
long_lat |
ENVELOPE(-44.516,-44.516,-60.733,-60.733) |
geographic |
Aitken Arctic |
geographic_facet |
Aitken Arctic |
genre |
Arctic Sea ice |
genre_facet |
Arctic Sea ice |
op_relation |
https://doi.org/10.5194/egusphere-2022-1079 https://noa.gwlb.de/receive/cop_mods_00063273 https://egusphere.copernicus.org/preprints/egusphere-2022-1079/egusphere-2022-1079.pdf |
op_rights |
https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/restrictedAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.5194/egusphere-2022-1079 |
_version_ |
1766309449449865216 |