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| Titel |
On contribution of horizontal and intra-layer convection to the formation of the Baltic Sea cold intermediate layer |
| VerfasserIn |
I. Chubarenko, N. Demchenko |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1812-0784
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| Digitales Dokument |
URL |
| Erschienen |
In: Ocean Science ; 6, no. 1 ; Nr. 6, no. 1 (2010-02-26), S.285-299 |
| Datensatznummer |
250003360
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| Publikation (Nr.) |
 copernicus.org/os-6-285-2010.pdf |
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| Zusammenfassung |
| Seasonal cascades down the coastal slopes and intra-layer convection are
considered as the two additional mechanisms contributing to the Baltic Sea
cold intermediate layer (CIL) formation along with conventional seasonal
vertical mixing. Field measurements are presented, reporting for the first
time the possibility of denser water formation and cascading from the Baltic
Sea underwater slopes, which take place under fall and winter cooling
conditions and deliver waters into intermediate layer of salinity stratified
deep-sea area. The presence in spring within the CIL of water with
temperature below that of maximum density (Tmd) and that at the local
surface in winter time allows tracing its formation: it is argued that the
source of the coldest waters of the Baltic CIL is early spring (March–April)
cascading, arising due to heating of water before reaching the Tmd. Fast
increase of the open water heat content during further spring heating
indicates that horizontal exchange rather than direct solar heating is
responsible for that. When the surface is covered with water, heated above
the Tmd, the conditions within the CIL become favorable for intralayer
convection due to the presence of waters of Tmd in intermediate layer, which
can explain its well-known features – the observed increase of its salinity
and deepening with time. |
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