Deep-water renewal in Lake Issyk-Kul driven by differential cooling

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2003
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Finger, David
Hofer, Markus
Brennwald, Matthias S.
Livingstone, David M.
Kipfer, Rolf
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During two field campaigns on Lake Issyk-Kul in March and August 2001, 179 high-resolution conductivity-temperature-depth profiles were measured, along with profiles of dissolved oxygen and light transmission. On the basis of this extensive data set, we investigated the large-scale vertical advective processes responsible for deepwater renewal in Lake Issyk-Kul. At some locations sampled in March, variable peak structures in the tracer profiles were observed that indicate horizontally localized intrusions. These intrusions have their origin in density plumes that propagate along the bottom of the channels in the eastern shelf region. The cold dense water at the bottom of the channels is most likely generated by differential cooling of the water in the shallow shelf regions during winter. During summer, vertical advective processes appear to be limited to the upper 200 m, where upwelling in the open water leads to a doming structure. The August data support the results of earlier investigations that suggested that dynamic forcing by a basinwide gyre is responsible for the upwelling in the open water.

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570 Biowissenschaften, Biologie
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deep-water renewal, Lake Issyk-Kul, dissolved oxygen, tracer profiles, Kyrgyzstan
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ISO 690PEETERS, Frank, David FINGER, Markus HOFER, Matthias S. BRENNWALD, David M. LIVINGSTONE, Rolf KIPFER, 2003. Deep-water renewal in Lake Issyk-Kul driven by differential cooling. In: Limnology and Oceanography. 2003, 48(4), pp. 1419-1431. eISSN 0024-3590. Available under: doi: 10.4319/lo.2003.48.4.1419
BibTex
@article{Peeters2003Deepw-8274,
  year={2003},
  doi={10.4319/lo.2003.48.4.1419},
  title={Deep-water renewal in Lake Issyk-Kul driven by differential cooling},
  number={4},
  volume={48},
  journal={Limnology and Oceanography},
  pages={1419--1431},
  author={Peeters, Frank and Finger, David and Hofer, Markus and Brennwald, Matthias S. and Livingstone, David M. and Kipfer, Rolf}
}
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