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Drivers of deep-water renewal events observed over 13 years in the South Basin of Lake Baikal

Publikationsart Peer-reviewed
Publikationsform Originalbeitrag (peer-reviewed)
Publikationsdatum 2015
Autor/in Tsimitri Chrysanthi, Tsimitri Chrysanthi, Rockel Burkhardt, Wüest Alfred, Wüest Alfred, Budnev Nikolay M., Sturm Michael, Schmid Martin,
Projekt The hidden dynamics of Lake Baikal - Prolongation
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Originalbeitrag (peer-reviewed)

Zeitschrift Journal of Geophysical Research C: Oceans
Volume (Issue) 120(3)
Seite(n) 1508 - 1526
Titel der Proceedings Journal of Geophysical Research C: Oceans
DOI 10.1002/2014JC010449

Abstract

© 2015. American Geophysical Union. All Rights Reserved. Lake Baikal, with a depth of 1637 m, is characterized by deep-water intrusions that bridge the near-surface layer to the hypolimnion. These episodic events transfer heat and oxygen over large vertical scales and maintain the permanent temperature stratified deep-water status of the lake. Here we evaluate a series of intrusion events that reached the bottom of the lake in terms of the stratification and the wind conditions under which they occurred and provide a new insight into the triggering mechanisms. We make use of long-term temperature and current meter data (2000-2013) recorded in the South Basin of the lake combined with wind data produced with a regional downscaling of the global NCEP-RA1 reanalysis product. A total of 13 events were observed during which near-surface cold water reached the bottom of the South Basin at 1350 m depth. We found that the triggering mechanism of the events is related to the time of the year that they take place. We categorized the events in three groups: (1) winter events, observed shortly before the complete ice cover of the lake that are triggered by Ekman coastal downwelling, (2) under-ice events, and (3) spring events, that show no correlation to the wind conditions and are possibly connected to the increased spring outflow of the Selenga River. Key Points: Mooring and wind data from Lake Baikal are analyzed to explain deep-water renewal Wind and seasonal stratification are important for deep-water volume replacements Three different types of deep-water renewal events were found in different seasons
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