Physics
Scientific paper
May 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008georl..3509605s&link_type=abstract
Geophysical Research Letters, Volume 35, Issue 9, CiteID L09605
Physics
5
Oceanography: Physical: Deep Recirculations, Oceanography: Physical: Nearshore Processes, Oceanography: General: Limnology (0458, 1845, 4942), Geographic Location: Large Bodies Of Water (E.G., Lakes And Inland Seas) (0746), Global Change: Impacts Of Global Change (1225)
Scientific paper
Deepwater renewal by intrusions and turbulent diffusion in Lake Baikal is very effective despite the enormous depth of up to 1642 m and the permanently stable stratification below ~300 m depth. Temperature time series recorded at the bottom of a mooring installed since March 2000 in the South Basin of the lake indicate recurrent freshwater intrusions with volumes of 50 to 100 km3, about one order of magnitude larger than previously observed intrusions. Numerous mechanisms have been proposed to explain the advective deep water renewal. Here we present for the first time direct observations which prove that they are caused by coastal downwelling and subsequent thermobaric instability along the steep lake shores. Understanding these mechanisms is an important prerequisite for studying biogeochemical cycles, for predicting the effects of climate change on this unique ecosystem and for evaluating the local climate history from the extraordinary sedimentary record of Lake Baikal.
Budnev Nikolay M.
Granin Nick G.
Schmid Martin
Schurter Michael
Sturm Michael
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