Arctic moisture source for Eurasian snow cover variations in autumn

Wegmann, Martin; Orsolini, Yvan; Vázquez, Marta; Gimeno, Luis; Nieto, Raquel; Bulygina, Olga; Jaiser, Ralf; Handorf, Dörthe; Rinke, Annette; Dethloff, Klaus; Sterin, Alexander; Brönnimann, Stefan (2015). Arctic moisture source for Eurasian snow cover variations in autumn. Environmental Research Letters, 10(5), 054015. IOP Publishing 10.1088/1748-9326/10/5/054015

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Eurasian fall snow cover changes have been suggested as a driver for changes in the Arctic Oscillation and might provide a link between sea-ice decline in the Arctic during summer and atmospheric circulation in the following winter. However, the mechanism connecting snow cover in Eurasia to sea-ice decline in autumn is still under debate. Our analysis is based on snow observations from 820 Russian land stations, moisture transport using a Lagrangian approach derived from meteorological re-analyses. We show that declining sea-ice in the Barents and Kara Seas (BKS) acts as moisture source for the enhanced Western Siberian snow depth as a result of changed tropospheric moisture transport. Transient disturbances enter the continent from the BKS region related to anomalies in the planetary wave pattern and move southward along the Ural mountains where they merge into the extension of the Mediterranean storm track.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Institute of Geography > Physical Geography > Unit Climatology
10 Strategic Research Centers > Oeschger Centre for Climate Change Research (OCCR)
08 Faculty of Science > Institute of Geography

Graduate School:

Graduate School of Climate Sciences

UniBE Contributor:

Wegmann, Martin and Brönnimann, Stefan

Subjects:

900 History > 910 Geography & travel

ISSN:

1748-9326

Publisher:

IOP Publishing

Language:

English

Submitter:

Monika Wälti-Stampfli

Date Deposited:

08 Jun 2015 10:31

Last Modified:

23 Nov 2015 13:51

Publisher DOI:

10.1088/1748-9326/10/5/054015

BORIS DOI:

10.7892/boris.69111

URI:

https://boris.unibe.ch/id/eprint/69111

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