Role of sea surface temperature, Arctic sea ice and Siberian snow in forcing the atmospheric circulation in winter of 2012–2013
During the 2012–2013 winter, the negative phase of the North Atlantic Oscillation (NAO) predominated, resulting in a cold winter over Europe and northern Asia punctuated by episodes of frigid weather. This climate anomaly is part of a recent trend towards negative values of the NAO index that has oc...
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ftcdlib:oai:escholarship.org:ark:/13030/qt367532h7 2024-09-15T18:21:40+00:00 Role of sea surface temperature, Arctic sea ice and Siberian snow in forcing the atmospheric circulation in winter of 2012–2013 Peings, Y Magnusdottir, G 1181 - 1206 2015-09-01 https://escholarship.org/uc/item/367532h7 https://doi.org/10.1007/s00382-014-2368-1 unknown eScholarship, University of California qt367532h7 https://escholarship.org/uc/item/367532h7 doi:10.1007/s00382-014-2368-1 public Climate Dynamics, vol 45, iss 5-6 Atmospheric Sciences Oceanography Physical Geography and Environmental Geoscience Meteorology & Atmospheric Sciences multimedia 2015 ftcdlib https://doi.org/10.1007/s00382-014-2368-1 2024-06-28T06:28:21Z During the 2012–2013 winter, the negative phase of the North Atlantic Oscillation (NAO) predominated, resulting in a cold winter over Europe and northern Asia punctuated by episodes of frigid weather. This climate anomaly is part of a recent trend towards negative values of the NAO index that has occurred over recent winters. The negative trend of the NAO may be related to atmospheric internal variability butit may also be partly forced by slowly varying components of the climate system. In the present study, we investigate the influence of surface conditions on the atmospheric circulation for the 2012–2013 winter using an atmospheric global climate model. In particular, the role of low Arctic sea ice concentration, warm tropical/North Atlantic sea surface temperature and positive Siberian snow cover anomalies are isolated by prescribing them in a set of different numerical experiments. Our simulations suggest that each of these surface forcings favored a negative NAO during the 2012–2013 winter. In our model, the combined NAO response to tropical/North Atlantic SST, Arctic sea ice and Siberian snow anomalies accounts for about 30% of the observed NAO anomaly. Different physical mechanisms are explored to elucidate the atmospheric responses and are shown to involve both tropical and extratropical processes. Software North Atlantic North Atlantic oscillation Sea ice University of California: eScholarship Climate Dynamics 45 5-6 1181 1206 |
institution |
Open Polar |
collection |
University of California: eScholarship |
op_collection_id |
ftcdlib |
language |
unknown |
topic |
Atmospheric Sciences Oceanography Physical Geography and Environmental Geoscience Meteorology & Atmospheric Sciences |
spellingShingle |
Atmospheric Sciences Oceanography Physical Geography and Environmental Geoscience Meteorology & Atmospheric Sciences Peings, Y Magnusdottir, G Role of sea surface temperature, Arctic sea ice and Siberian snow in forcing the atmospheric circulation in winter of 2012–2013 |
topic_facet |
Atmospheric Sciences Oceanography Physical Geography and Environmental Geoscience Meteorology & Atmospheric Sciences |
description |
During the 2012–2013 winter, the negative phase of the North Atlantic Oscillation (NAO) predominated, resulting in a cold winter over Europe and northern Asia punctuated by episodes of frigid weather. This climate anomaly is part of a recent trend towards negative values of the NAO index that has occurred over recent winters. The negative trend of the NAO may be related to atmospheric internal variability butit may also be partly forced by slowly varying components of the climate system. In the present study, we investigate the influence of surface conditions on the atmospheric circulation for the 2012–2013 winter using an atmospheric global climate model. In particular, the role of low Arctic sea ice concentration, warm tropical/North Atlantic sea surface temperature and positive Siberian snow cover anomalies are isolated by prescribing them in a set of different numerical experiments. Our simulations suggest that each of these surface forcings favored a negative NAO during the 2012–2013 winter. In our model, the combined NAO response to tropical/North Atlantic SST, Arctic sea ice and Siberian snow anomalies accounts for about 30% of the observed NAO anomaly. Different physical mechanisms are explored to elucidate the atmospheric responses and are shown to involve both tropical and extratropical processes. |
format |
Software |
author |
Peings, Y Magnusdottir, G |
author_facet |
Peings, Y Magnusdottir, G |
author_sort |
Peings, Y |
title |
Role of sea surface temperature, Arctic sea ice and Siberian snow in forcing the atmospheric circulation in winter of 2012–2013 |
title_short |
Role of sea surface temperature, Arctic sea ice and Siberian snow in forcing the atmospheric circulation in winter of 2012–2013 |
title_full |
Role of sea surface temperature, Arctic sea ice and Siberian snow in forcing the atmospheric circulation in winter of 2012–2013 |
title_fullStr |
Role of sea surface temperature, Arctic sea ice and Siberian snow in forcing the atmospheric circulation in winter of 2012–2013 |
title_full_unstemmed |
Role of sea surface temperature, Arctic sea ice and Siberian snow in forcing the atmospheric circulation in winter of 2012–2013 |
title_sort |
role of sea surface temperature, arctic sea ice and siberian snow in forcing the atmospheric circulation in winter of 2012–2013 |
publisher |
eScholarship, University of California |
publishDate |
2015 |
url |
https://escholarship.org/uc/item/367532h7 https://doi.org/10.1007/s00382-014-2368-1 |
op_coverage |
1181 - 1206 |
genre |
North Atlantic North Atlantic oscillation Sea ice |
genre_facet |
North Atlantic North Atlantic oscillation Sea ice |
op_source |
Climate Dynamics, vol 45, iss 5-6 |
op_relation |
qt367532h7 https://escholarship.org/uc/item/367532h7 doi:10.1007/s00382-014-2368-1 |
op_rights |
public |
op_doi |
https://doi.org/10.1007/s00382-014-2368-1 |
container_title |
Climate Dynamics |
container_volume |
45 |
container_issue |
5-6 |
container_start_page |
1181 |
op_container_end_page |
1206 |
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1810460402385944576 |