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  • Olsson, TaruFinnish Meteorol Inst, PL 503, Helsinki 00101, Finland. (författare)

Statistics of sea-effect snowfall along the Finnish coastline based on regional climate model data

  • Artikel/kapitelEngelska2020

Förlag, utgivningsår, omfång ...

  • 2020-06-18
  • COPERNICUS GESELLSCHAFT MBH,2020
  • electronicrdacarrier

Nummerbeteckningar

  • LIBRIS-ID:oai:DiVA.org:uu-418900
  • https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-418900URI
  • https://doi.org/10.5194/asr-17-87-2020DOI

Kompletterande språkuppgifter

  • Språk:engelska
  • Sammanfattning på:engelska

Ingår i deldatabas

Klassifikation

  • Ämneskategori:ref swepub-contenttype
  • Ämneskategori:art swepub-publicationtype

Anmärkningar

  • The formation of convective sea-effect snowfall (i.e., snow bands) is triggered by cold air outbreaks over a relatively warm and open sea. Snow bands can produce intense snowfall which can last for several days over the sea and potentially move towards the coast depending on wind direction. We defined the meteorological conditions which statistically favor the formation of snow bands over the north-eastern Baltic Sea of the Finnish coastline and investigated the spatio-temporal characteristics of these snow bands. A set of criteria, which have been previously shown to be able to detect the days favoring sea-effect snowfall for Swedish coastal area, were refined for Finland based on four case study simulations, utilizing a convection-permitting numerical weather prediction (NWP) model (HARMONIE-AROME). The main modification of the detection criteria concerned the threshold for 10 m wind speed: the generally assumed threshold value of 10 ms 1 was decreased to 7 ms(-1). The refined criteria were then applied to regional climate model (RCA4) data, for an 11-year time period (2000-2010). When only considering cases in Finland with onshore wind direction, we found on average 3 d yr(-1) with favorable conditions for coastal sea-effect snowfall. The heaviest convective snowfall events were detected most frequently over the southern coastline. Statistics of the favorable days indicated that the lower 10 m wind speed threshold improved the representation of the frequency of snow bands. For most of the favorable snow band days, the location and order of magnitude of precipitation were closely captured, when compared to gridded observational data for land areas and weather radar reflectivity images. Lightning were observed during one third of the favorable days over the Baltic Sea area.

Ämnesord och genrebeteckningar

Biuppslag (personer, institutioner, konferenser, titlar ...)

  • Luomaranta, AnnaFinnish Meteorol Inst, PL 503, Helsinki 00101, Finland. (författare)
  • Jylha, KirstiFinnish Meteorol Inst, PL 503, Helsinki 00101, Finland. (författare)
  • Jeworrek, JuliaUniv British Columbia, Dept Earth Ocean & Atmospher Sci, Vancouver, BC, Canada. (författare)
  • Perttula, TuuliFinnish Meteorol Inst, PL 503, Helsinki 00101, Finland. (författare)
  • Dieterich, ChristianSwedish Meteorol & Hydrol Inst, Norrkoping, Sweden. (författare)
  • Wu, LichuanUppsala universitet,Luft-, vatten- och landskapslära(Swepub:uu)licwu661 (författare)
  • Rutgersson, Anna,1971-Uppsala universitet,Luft-, vatten- och landskapslära,Uppsala Univ, Ctr Nat Hazards & Disaster Sci CNDS, Uppsala, Sweden.(Swepub:uu)aru27058 (författare)
  • Makela, AnttiFinnish Meteorol Inst, PL 503, Helsinki 00101, Finland. (författare)
  • Finnish Meteorol Inst, PL 503, Helsinki 00101, Finland.Univ British Columbia, Dept Earth Ocean & Atmospher Sci, Vancouver, BC, Canada. (creator_code:org_t)

Sammanhörande titlar

  • Ingår i:Advances in Science and Research: COPERNICUS GESELLSCHAFT MBH17, s. 87-1041992-06281992-0636

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