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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ftnilu:oai:nilu.brage.unit.no:11250/2636557 2023-07-30T04:02:01+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 application/pdf http://hdl.handle.net/11250/2636557 https://doi.org/10.1175/JCLI-D-18-0861.1 eng eng Norges forskningsråd: 261743 Norges forskningsråd: 244166 EC/H2020/727852 NILU - Norsk institutt for luftforskning: 115089 Journal of Climate. 2020, 33 527-545. urn:issn:0894-8755 http://hdl.handle.net/11250/2636557 https://doi.org/10.1175/JCLI-D-18-0861.1 cristin:1766591 © 2019 American Meteorological Society 527-545 33 Journal of Climate Journal article Peer reviewed 2020 ftnilu https://doi.org/10.1175/JCLI-D-18-0861.1 2023-07-08T19:54:32Z 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 Embargo period: 6 months Article in Journal/Newspaper Arctic North Atlantic North Atlantic oscillation Sea ice Alaska Siberia NILU – Norwegian Institute for Air Research: NILU Brage Arctic The Splits ENVELOPE(-123.670,-123.670,61.167,61.167) Journal of Climate 33 2 527 545 |
institution |
Open Polar |
collection |
NILU – Norwegian Institute for Air Research: NILU Brage |
op_collection_id |
ftnilu |
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 Embargo period: 6 months |
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 |
publishDate |
2020 |
url |
http://hdl.handle.net/11250/2636557 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 |
527-545 33 Journal of Climate |
op_relation |
Norges forskningsråd: 261743 Norges forskningsråd: 244166 EC/H2020/727852 NILU - Norsk institutt for luftforskning: 115089 Journal of Climate. 2020, 33 527-545. urn:issn:0894-8755 http://hdl.handle.net/11250/2636557 https://doi.org/10.1175/JCLI-D-18-0861.1 cristin:1766591 |
op_rights |
© 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 |
_version_ |
1772812741090738176 |