© ICDP, the International Continental Scientific Drilling Program, 1996-2020

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Climate evolution in Central Asia during the past few million years: A case study from Lake Issyk-Kul, Kyrgyzstan

Asia, Kyrgyzstan, Lake Issyk-Kul

revised workshop-proposal: ICDP-2009/13
for the funding-period starting 2009-01-15
by Hedi (Hedwig) Oberhänsli, Peter Molnar
Abstract
The sedimentary record of the Lake Issyk-kul in the NW Tien Shan holds a long climatic history for this environmentally sensitive region. We plan to examine the sediment records of the lake, focusing on the time frame through the Pliocene and into the late (and maybe middle) Miocene. The sediment archive provides insight into - glacial history in the hinterland (i) 2-3 Ma, (ii) 150 -10 ka - vegetation history, diversity patterns as a reaction on specific climate states, - dust mobilisation as a reaction on changed atmospheric patterns - erosional history for different time windows, like (i) since 10 Ma, (ii) 4 Ma, (iii) 150 ka The erosional history will be a focus of interest as an expression both of regional and global climate manifested by prevailing westerly winds, the Arctic vortex, and the Siberian High Pressure System, and of local tectonic development. Accordingly, we consider local changes in the catchment area due to orographic changes. The data base gathered for the Issyk-Kul archive, not just alone but especially when compared with other regional and global paleoclimatic records, will lead towards a better understanding of the connection between regional climatic change holding information on the development, contribution and integration of the Central Asian climate system with its specific components contributing the evolution of global climate. A workshop is essential to design a full ICDP proposal for deep drilling in Issyk-Kul, because an effective exchange of information, data, and ideas among more than 30 scientists from at least 10 countries (see enclosure) can be achieved only by direct communication during a joint meeting.
Scientific Objectives
  • Main objectives of the workshop are:
  • to synthesize data from previous field campaigns 1998-2002 (Ricketts et al., 2001; and planned for autumn 2009,
  • to select possible coring locations for a deep drilling, based on the results of the seismic surveys, o identify most promising drilling sites based on the deep seismic survey which will be perfomed in September 2009 for the long (10 Ma), medium (4 Ma) and short (last 150 ka) time environmental and climate reconstructions, and o to identify most promising areas for reconstructing the glacial history under changing climatic and orographic conditions in the catchment area of Issyk-kul to identify areas for field work to understanding the local tectonic history blurring the primary, environmental and climatic record,
  • to discuss the use of proxies for evaluating the environmental and climate changes and identifying the most appropriate tools for reading sediment accumulation as a result of erosion due to climate change and to Late Cenozoic orographic evolution in the catchment area of Issyk-Kul,
  • to develop a strategy and schedule for future field and subsequent laboratory work,
  • to discuss the issue of fieldwork permits and determine responsibilities,
  • to plan logistics and to calculate costs for future field and laboratory work,
  • to plan grant applications to national and international funding organisations,
  • to develop a first draft of a full ICDP proposal for deep drilling.
Keywords
Asia, ICDP-2009/13, ISSYK-KUL, Lake drilling, Lake issyk-kul, Late tertiary, Local tectonics
Location
Asia, Kyrgyzstan, Lake Issyk-Kul: 42.50000, 77.50000

© ICDP, the International Continental Scientific Drilling Program, 1996-2020

www.icdp-online.org