Understanding of European Cold Extremes, Sudden Stratospheric Warming, and Siberian Snow Accumulation in the Winter of 2017/18
It is unclear whether the Eurasian snow plays a role in the tropospheric driving of sudden stratospheric warming (SSW). The major SSW event of February 2018 is analyzed using reanalysis datasets. Characterized by predominant planetary waves of zonal wave 2, the SSW developed into a vortex split via...
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American Meteorological Society
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ftunivbergen:oai:bora.uib.no:1956/21855 2023-05-15T15:11:17+02:00 Understanding of European Cold Extremes, Sudden Stratospheric Warming, and Siberian Snow Accumulation in the Winter of 2017/18 Lü, Zhuozhuo Li, Fei Orsolini, Yvan Gao, Yongqi He, Shengping 2020-01-10T13:33:29Z application/pdf https://hdl.handle.net/1956/21855 https://doi.org/10.1175/jcli-d-18-0861.1 eng eng American Meteorological Society Norges forskningsråd: 261743 Norges forskningsråd: 244166 EC/H2020: 727852 NILU - Norsk institutt for luftforskning: 115089 urn:issn:1520-0442 urn:issn:0894-8755 https://hdl.handle.net/1956/21855 https://doi.org/10.1175/jcli-d-18-0861.1 cristin:1766591 Journal of Climate. 2020;33:527-545 Copyright 2019 American Meteorological Society Journal of Climate 527-545 33 Peer reviewed Journal article 2020 ftunivbergen https://doi.org/10.1175/jcli-d-18-0861.1 2023-03-14T17:41:57Z It is unclear whether the Eurasian snow plays a role in the tropospheric driving of sudden stratospheric warming (SSW). The major SSW event of February 2018 is analyzed using reanalysis datasets. Characterized by predominant planetary waves of zonal wave 2, the SSW developed into a vortex split via wave–mean flow interaction. In the following two weeks, the downward migration of zonal-mean zonal wind anomalies was accompanied by a significant transition to the negative phase of the North Atlantic Oscillation, leading to extensive cold extremes across Europe. Here, we demonstrate that anomalous Siberian snow accumulation could have played an important role in the 2018 SSW occurrence. In the 2017/18 winter, snow depths over Siberia were much higher than normal. A lead–lag correlation analysis shows that the positive fluctuating snow depth anomalies, leading to intensified “cold domes” over eastern Siberia (i.e., in a region where the climatological upward planetary waves maximize), precede enhanced wave-2 pulses of meridional heat fluxes (100 hPa) by 7–8 days. The snow–SSW linkage over 2003–19 is further investigated, and some common traits among three split events are found. These include a time lag of about one week between the maximum anomalies of snow depth and wave-2 pulses (100 hPa), high sea level pressure favored by anomalous snowpack, and a ridge anchoring over Siberia as precursor of the splits. The role of tropospheric ridges over Alaska and the Urals in the wave-2 enhancement and the role of Arctic sea ice loss in Siberian snow accumulation are also discussed. publishedVersion Article in Journal/Newspaper Arctic North Atlantic North Atlantic oscillation Sea ice Alaska Siberia University of Bergen: Bergen Open Research Archive (BORA-UiB) Arctic The Splits ENVELOPE(-123.670,-123.670,61.167,61.167) Journal of Climate 33 2 527 545 |
institution |
Open Polar |
collection |
University of Bergen: Bergen Open Research Archive (BORA-UiB) |
op_collection_id |
ftunivbergen |
language |
English |
description |
It is unclear whether the Eurasian snow plays a role in the tropospheric driving of sudden stratospheric warming (SSW). The major SSW event of February 2018 is analyzed using reanalysis datasets. Characterized by predominant planetary waves of zonal wave 2, the SSW developed into a vortex split via wave–mean flow interaction. In the following two weeks, the downward migration of zonal-mean zonal wind anomalies was accompanied by a significant transition to the negative phase of the North Atlantic Oscillation, leading to extensive cold extremes across Europe. Here, we demonstrate that anomalous Siberian snow accumulation could have played an important role in the 2018 SSW occurrence. In the 2017/18 winter, snow depths over Siberia were much higher than normal. A lead–lag correlation analysis shows that the positive fluctuating snow depth anomalies, leading to intensified “cold domes” over eastern Siberia (i.e., in a region where the climatological upward planetary waves maximize), precede enhanced wave-2 pulses of meridional heat fluxes (100 hPa) by 7–8 days. The snow–SSW linkage over 2003–19 is further investigated, and some common traits among three split events are found. These include a time lag of about one week between the maximum anomalies of snow depth and wave-2 pulses (100 hPa), high sea level pressure favored by anomalous snowpack, and a ridge anchoring over Siberia as precursor of the splits. The role of tropospheric ridges over Alaska and the Urals in the wave-2 enhancement and the role of Arctic sea ice loss in Siberian snow accumulation are also discussed. publishedVersion |
format |
Article in Journal/Newspaper |
author |
Lü, Zhuozhuo Li, Fei Orsolini, Yvan Gao, Yongqi He, Shengping |
spellingShingle |
Lü, Zhuozhuo Li, Fei Orsolini, Yvan Gao, Yongqi He, Shengping Understanding of European Cold Extremes, Sudden Stratospheric Warming, and Siberian Snow Accumulation in the Winter of 2017/18 |
author_facet |
Lü, Zhuozhuo Li, Fei Orsolini, Yvan Gao, Yongqi He, Shengping |
author_sort |
Lü, Zhuozhuo |
title |
Understanding of European Cold Extremes, Sudden Stratospheric Warming, and Siberian Snow Accumulation in the Winter of 2017/18 |
title_short |
Understanding of European Cold Extremes, Sudden Stratospheric Warming, and Siberian Snow Accumulation in the Winter of 2017/18 |
title_full |
Understanding of European Cold Extremes, Sudden Stratospheric Warming, and Siberian Snow Accumulation in the Winter of 2017/18 |
title_fullStr |
Understanding of European Cold Extremes, Sudden Stratospheric Warming, and Siberian Snow Accumulation in the Winter of 2017/18 |
title_full_unstemmed |
Understanding of European Cold Extremes, Sudden Stratospheric Warming, and Siberian Snow Accumulation in the Winter of 2017/18 |
title_sort |
understanding of european cold extremes, sudden stratospheric warming, and siberian snow accumulation in the winter of 2017/18 |
publisher |
American Meteorological Society |
publishDate |
2020 |
url |
https://hdl.handle.net/1956/21855 https://doi.org/10.1175/jcli-d-18-0861.1 |
long_lat |
ENVELOPE(-123.670,-123.670,61.167,61.167) |
geographic |
Arctic The Splits |
geographic_facet |
Arctic The Splits |
genre |
Arctic North Atlantic North Atlantic oscillation Sea ice Alaska Siberia |
genre_facet |
Arctic North Atlantic North Atlantic oscillation Sea ice Alaska Siberia |
op_source |
Journal of Climate 527-545 33 |
op_relation |
Norges forskningsråd: 261743 Norges forskningsråd: 244166 EC/H2020: 727852 NILU - Norsk institutt for luftforskning: 115089 urn:issn:1520-0442 urn:issn:0894-8755 https://hdl.handle.net/1956/21855 https://doi.org/10.1175/jcli-d-18-0861.1 cristin:1766591 Journal of Climate. 2020;33:527-545 |
op_rights |
Copyright 2019 American Meteorological Society |
op_doi |
https://doi.org/10.1175/jcli-d-18-0861.1 |
container_title |
Journal of Climate |
container_volume |
33 |
container_issue |
2 |
container_start_page |
527 |
op_container_end_page |
545 |
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1766342161359437824 |