Meteorological conditions in the central Arctic summer during the Arctic Summer Cloud Ocean Study (ASCOS)
Understanding the rapidly changing climate in the Arctic is limited by a lack of understanding of underlying strong feedback mechanisms that are specific to the Arctic. Progress in this field can only be obtained by process-level observations; this is the motivation for intensive ice-breaker-based c...
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European Geosciences Union
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Online Access: | https://eprints.whiterose.ac.uk/77215/ https://eprints.whiterose.ac.uk/77215/9/Tjernstrom_2012_acp-12-6863-2012_with_coversheet.pdf https://doi.org/10.5194/acp-12-6863-2012 |
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ftleedsuniv:oai:eprints.whiterose.ac.uk:77215 2024-06-02T07:59:37+00:00 Meteorological conditions in the central Arctic summer during the Arctic Summer Cloud Ocean Study (ASCOS) Tjernström, M Leck, C Birch, CE Brooks, IM Shupe, MD Persson, POG Wheeler, CR Sedlar, J Mauritsen, T Paatero, J Szczodrak, M 2012 text https://eprints.whiterose.ac.uk/77215/ https://eprints.whiterose.ac.uk/77215/9/Tjernstrom_2012_acp-12-6863-2012_with_coversheet.pdf https://doi.org/10.5194/acp-12-6863-2012 en eng European Geosciences Union https://eprints.whiterose.ac.uk/77215/9/Tjernstrom_2012_acp-12-6863-2012_with_coversheet.pdf Tjernström, M, Leck, C, Birch, CE et al. (10 more authors) (2012) Meteorological conditions in the central Arctic summer during the Arctic Summer Cloud Ocean Study (ASCOS). Atmospheric Chemistry and Physics, 12 (15). 6863 - 6889. ISSN 1680-7316 Article NonPeerReviewed 2012 ftleedsuniv https://doi.org/10.5194/acp-12-6863-2012 2024-05-06T12:40:54Z Understanding the rapidly changing climate in the Arctic is limited by a lack of understanding of underlying strong feedback mechanisms that are specific to the Arctic. Progress in this field can only be obtained by process-level observations; this is the motivation for intensive ice-breaker-based campaigns such as the Arctic Summer Cloud-Ocean Study (ASCOS), described here. However, detailed field observations also have to be put in the context of the larger-scale meteorology, and short field campaigns have to be analysed within the context of the underlying climate state and temporal anomalies from this. To aid in the analysis of other parameters or processes observed during this campaign, this paper provides an overview of the synoptic-scale meteorology and its climatic anomaly during the ASCOS field deployment. It also provides a statistical analysis of key features during the campaign, such as key meteorological variables, the vertical structure of the lower troposphere and clouds, and energy fluxes at the surface. In order to assess the representativity of the ASCOS results, we also compare these features to similar observations obtained during three earlier summer experiments in the Arctic Ocean: the AOE-96, SHEBA and AOE-2001 expeditions. We find that these expeditions share many key features of the summertime lower troposphere. Taking ASCOS and the previous expeditions together, a common picture emerges with a large amount of low-level cloud in a well-mixed shallow boundary layer, capped by a weak to moderately strong inversion where moisture, and sometimes also cloud top, penetrate into the lower parts of the inversion. Much of the boundary-layer mixing is due to cloud-top cooling and subsequent buoyant overturning of the cloud. The cloud layer may, or may not, be connected with surface processes depending on the depths of the cloud and surface-based boundary layers and on the relative strengths of surface-shear and cloud-generated turbulence. The latter also implies a connection between the cloud ... Article in Journal/Newspaper Arctic Arctic Arctic Ocean White Rose Research Online (Universities of Leeds, Sheffield & York) Arctic Arctic Ocean Breaker ENVELOPE(-67.257,-67.257,-67.874,-67.874) Atmospheric Chemistry and Physics 12 15 6863 6889 |
institution |
Open Polar |
collection |
White Rose Research Online (Universities of Leeds, Sheffield & York) |
op_collection_id |
ftleedsuniv |
language |
English |
description |
Understanding the rapidly changing climate in the Arctic is limited by a lack of understanding of underlying strong feedback mechanisms that are specific to the Arctic. Progress in this field can only be obtained by process-level observations; this is the motivation for intensive ice-breaker-based campaigns such as the Arctic Summer Cloud-Ocean Study (ASCOS), described here. However, detailed field observations also have to be put in the context of the larger-scale meteorology, and short field campaigns have to be analysed within the context of the underlying climate state and temporal anomalies from this. To aid in the analysis of other parameters or processes observed during this campaign, this paper provides an overview of the synoptic-scale meteorology and its climatic anomaly during the ASCOS field deployment. It also provides a statistical analysis of key features during the campaign, such as key meteorological variables, the vertical structure of the lower troposphere and clouds, and energy fluxes at the surface. In order to assess the representativity of the ASCOS results, we also compare these features to similar observations obtained during three earlier summer experiments in the Arctic Ocean: the AOE-96, SHEBA and AOE-2001 expeditions. We find that these expeditions share many key features of the summertime lower troposphere. Taking ASCOS and the previous expeditions together, a common picture emerges with a large amount of low-level cloud in a well-mixed shallow boundary layer, capped by a weak to moderately strong inversion where moisture, and sometimes also cloud top, penetrate into the lower parts of the inversion. Much of the boundary-layer mixing is due to cloud-top cooling and subsequent buoyant overturning of the cloud. The cloud layer may, or may not, be connected with surface processes depending on the depths of the cloud and surface-based boundary layers and on the relative strengths of surface-shear and cloud-generated turbulence. The latter also implies a connection between the cloud ... |
format |
Article in Journal/Newspaper |
author |
Tjernström, M Leck, C Birch, CE Brooks, IM Shupe, MD Persson, POG Wheeler, CR Sedlar, J Mauritsen, T Paatero, J Szczodrak, M |
spellingShingle |
Tjernström, M Leck, C Birch, CE Brooks, IM Shupe, MD Persson, POG Wheeler, CR Sedlar, J Mauritsen, T Paatero, J Szczodrak, M Meteorological conditions in the central Arctic summer during the Arctic Summer Cloud Ocean Study (ASCOS) |
author_facet |
Tjernström, M Leck, C Birch, CE Brooks, IM Shupe, MD Persson, POG Wheeler, CR Sedlar, J Mauritsen, T Paatero, J Szczodrak, M |
author_sort |
Tjernström, M |
title |
Meteorological conditions in the central Arctic summer during the Arctic Summer Cloud Ocean Study (ASCOS) |
title_short |
Meteorological conditions in the central Arctic summer during the Arctic Summer Cloud Ocean Study (ASCOS) |
title_full |
Meteorological conditions in the central Arctic summer during the Arctic Summer Cloud Ocean Study (ASCOS) |
title_fullStr |
Meteorological conditions in the central Arctic summer during the Arctic Summer Cloud Ocean Study (ASCOS) |
title_full_unstemmed |
Meteorological conditions in the central Arctic summer during the Arctic Summer Cloud Ocean Study (ASCOS) |
title_sort |
meteorological conditions in the central arctic summer during the arctic summer cloud ocean study (ascos) |
publisher |
European Geosciences Union |
publishDate |
2012 |
url |
https://eprints.whiterose.ac.uk/77215/ https://eprints.whiterose.ac.uk/77215/9/Tjernstrom_2012_acp-12-6863-2012_with_coversheet.pdf https://doi.org/10.5194/acp-12-6863-2012 |
long_lat |
ENVELOPE(-67.257,-67.257,-67.874,-67.874) |
geographic |
Arctic Arctic Ocean Breaker |
geographic_facet |
Arctic Arctic Ocean Breaker |
genre |
Arctic Arctic Arctic Ocean |
genre_facet |
Arctic Arctic Arctic Ocean |
op_relation |
https://eprints.whiterose.ac.uk/77215/9/Tjernstrom_2012_acp-12-6863-2012_with_coversheet.pdf Tjernström, M, Leck, C, Birch, CE et al. (10 more authors) (2012) Meteorological conditions in the central Arctic summer during the Arctic Summer Cloud Ocean Study (ASCOS). Atmospheric Chemistry and Physics, 12 (15). 6863 - 6889. ISSN 1680-7316 |
op_doi |
https://doi.org/10.5194/acp-12-6863-2012 |
container_title |
Atmospheric Chemistry and Physics |
container_volume |
12 |
container_issue |
15 |
container_start_page |
6863 |
op_container_end_page |
6889 |
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1800743748467949568 |