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- Jeworrek, JuliaUppsala universitet,Luft-, vatten- och landskapslära (author)
Characteristics of convective snow bands along the Swedish east coast
- Article/chapterEnglish2017
Publisher, publication year, extent ...
- 2017-03-06
- Copernicus GmbH,2017
- electronicrdacarrier
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- LIBRIS-ID:oai:DiVA.org:uu-318879
- https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-318879URI
- https://doi.org/10.5194/esd-8-163-2017DOI
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- Language:English
- Summary in:English
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- Convective snow bands develop in response to a cold air outbreak from the continent or the frozen sea over the open water surface of lakes or seas. The comparatively warm water body triggers shallow convection due to increased heat and moisture fluxes. Strong winds can align with this convection into wind-parallel cloud bands, which appear stationary as the wind direction remains consistent for the time period of the snow band event, delivering enduring snow precipitation at the approaching coast. The statistical analysis of a dataset from an 11-year high-resolution atmospheric regional climate model (RCA4) indicated 4 to 7 days a year of moderate to highly favourable conditions for the development of convective snow bands in the Baltic Sea region. The heaviest and most frequent lake effect snow was affecting the regions of Gavle and Vastervik (along the Swedish east coast) as well as Gdansk (along the Polish coast). However, the hourly precipitation rate is often higher in le than in the Vtervik region. Two case studies comparing five different RCA4 model setups have shown that the Rossby Centre atmospheric regional climate model RCA4 provides a superior representation of the sea surface with more accurate sea surface temperature (SST) values when coupled to the ice-ocean model NEMO as opposed to the forcing by the ERA-40 reanalysis data. The refinement of the resolution of the atmospheric model component leads, especially in the horizontal direction, to significant improvement in the representation of the mesoscale circulation process as well as the local precipitation rate and area by the model.
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- Wu, LichuanUppsala universitet,Luft-, vatten- och landskapslära(Swepub:uu)licwu661 (author)
- Dieterich, ChristianSwedish Meteorol & Hydrol Inst, S-60176 Norrkoping, Sweden (author)
- Rutgersson, AnnaUppsala universitet,Luft-, vatten- och landskapslära(Swepub:uu)aru27058 (author)
- Uppsala universitetLuft-, vatten- och landskapslära (creator_code:org_t)
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- In:Earth System Dynamics: Copernicus GmbH8, s. 163-1752190-49792190-4987
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