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Discussion papers | Copyright
https://doi.org/10.5194/cpd-8-5053-2012
© Author(s) 2012. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 10 Oct 2012

Research article | 10 Oct 2012

Review status
This discussion paper is a preprint. It has been under review for the journal Climate of the Past (CP). The revised manuscript was not accepted.

Palaeostages of the Caspian Sea as a set of regional benchmark tests for the evaluation of climate model simulations

A. Kislov1, A. Panin2, and P. Toropov1 A. Kislov et al.
  • 1Lomonosov Moscow State University, Faculty of Geography, Department of Meteorology & Climatology, Lenin Gory, 1, 119991, Moscow, Russia
  • 2Lomonosov Moscow State University, Faculty of Geography, Department of Geomorphology & Palaeogeography, Lenin Gory, 1, 119991, Moscow, Russia

Abstract. Oscillations of the level of the Caspian Sea (CS) primarily stem from variations in runoff from the Volga River. Therefore, changes in the level of the CS can be used to assess the ability of climate models to reproduce the water budget over the East European Plain. We compare observed or reconstructed CS level positions during the Last Glacial Maximum (LGM), Holocene and modern periods with the CS level positions calculated based on simulations in experiments using the CMIP5/PMIP3 protocol. The proxy dataset comprises a number of detailed maps of the CS for the main regression stages and transgression stages during the last 30 ka together with information about sea-level positions. The results show poor correspondence between the model simulations of decadal- and centennial-scale level oscillations and proxy reconstructions. We propose that such discrepancies can be caused by insufficient sensitivity of the climate models used. The modelled data could be verified based on how well the models simulated the sharp decrease of the Volga River runoff during the LGM, which caused a large decline of the CS level.

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A. Kislov et al.
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