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A comparison between the ERA40 and the SMHI gridded meteorological databases as applied to Baltic Sea modelling

Artikel i vetenskaplig tidskrift
Författare Anders Omstedt
Yomin Chen
Karin Wesslander
Publicerad i Nordic Hydrology
Volym 36
Nummer/häfte 4-5
Sidor 369-380
ISSN 0029-1277
Publiceringsår 2005
Publicerad vid Institutionen för geovetenskaper
Sidor 369-380
Språk en
Ämnesord baltic sea, evaporation, meteorological data, modelling, precipitation, sea ice, net precipitation, water, balance
Ämneskategorier Geovetenskap och miljövetenskap

Sammanfattning

Two gridded meteorological data sets for the Baltic Sea region, both having 1 degrees x 1 degrees horizontal resolution, were compared and analysed for use in Baltic Sea modelling. The SMHI 1 degrees x 1 degrees data set covers surface parameters with a three-hour time resolution over the 1970-2004 period. The ERA40 data cover analysed and modelled parameters for several atmospheric layers with a six-hour time resolution over the 1957-2002 period. Meteorological variables considered in this analysis were air temperature, wind speed, total cloud cover, relative humidity and precipitation. In considering Baltic Sea modelling, we examined maximum ice extent, water temperature, salinity and net precipitation calculations. The two data sets are largely similar and can both be used in Baltic Sea modelling. However, their horizontal resolution is too coarse for resolving marine conditions over the Baltic Sea. This implies, for example, that the ERA40 original surface winds are too low for some Baltic Sea regions. The ERA40 precipitation values are also too low compared with those of the SMHI and other available data.

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