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Simulated variations of the Baltic Sea halocline during 1961-2007
SMHI, Research Department, Oceanography.ORCID iD: 0000-0002-2452-439X
SMHI, Research Department, Oceanography.ORCID iD: 0000-0001-5494-2122
Marine Systems Institute at Tallinn University of Technology, Tallinn, Estonia.
2012 (English)Report (Other academic)
Abstract [sv]

Variationer i Östersjöns salthalt och haloklindjup under perioden 1961-2007 har studerats med hjälp av Rossby Centre Ocean Model. De största trenderna i måndadsmedelvärdet av medelsalthalten i de översta 15 m hittades i Rigabukten samt i egentliga Östersjön. I de nordligaste delarna av Östersjön kunde ej någon signifikant trend påvisas. Perioden 1970-1975 uppvisade en grund haloklin, emedan en djup haloklin kunde identifieras under perioden 1990-1995. Skillnaden i djup mellan de båda perioderna var över 15 m i egentliga Östersjön. Modellsimuleringarna antyder att medelytsalthalten i Östersjön är rumsligt styrd av den ackumulerade flodtillrinningen, medan salthalten under haloklinen i egentliga Östersjön styrs av den zonala medelvinden och den absoluta vindhastigheten. Den zonala vindhastighetens påverkan på det genomsnittliga haloklindjupet i egentliga Östersjön är måttlig och flodtillrinningens påverkan är låg.

Abstract [en]

The variations in the Baltic Sea salinity and the mean halocline depth during 1961-2007 are studied using Rossby Centre Ocean model. The largest trend in the monthly mean salinity averaged over the top 15 m was found in the Gulf of Riga and Baltic proper, while the trend in the northernmost part was non-existant. A period with shallow halocline in the Baltic Sea during 1970-1975 was identified and a period with deep halocline during 1990-1995 with the difference exceeding morethan 15 m in the Baltic proper between the two time-periods. Model simulation indicated that the mean surface salinity in the Baltic Sea is spatially controlled by the accumulated river runoff, while the mean salinity below the halocline in the Baltic proper by the mean zonal and absolute wind speed. The halocline depth in the Baltic Sea is affected significantly by the freshwater content and absolute wind speed. The impact of the mean zonal wind speed to the mean halocline depth in the Baltic proper is moderate, while the impact of runoff is low.

Place, publisher, year, edition, pages
SMHI , 2012. , 37 p.
Series
RO, Report Oceanography, ISSN 0283-1112 ; 44
Keyword [en]
Baltic Sea, RCO, numerical modelling, halocline depth, salinity
Identifiers
URN: urn:nbn:se:smhi:diva-2317Local ID: Oceanografi, Rapporter, Serie ROOAI: oai:DiVA.org:smhi-2317DiVA: diva2:947610
Available from: 2012-05-21 Created: 2016-07-08 Last updated: 2016-07-08Bibliographically approved

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