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HIGH-RESOLUTION RECONSTRUCTION OF CLIMATE CHANGE IN CENTRAL ASIA OVER THE PAST MILLENNIUM
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HIGH-RESOLUTION RECONSTRUCTION OF CLIMATE CHANGE IN CENTRAL ASIA OVER THE PAST MILLENNIUM
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Conference Proceeding
HIGH-RESOLUTION RECONSTRUCTION OF CLIMATE CHANGE IN CENTRAL ASIA OVER THE PAST MILLENNIUM
2010
Overview
Reconstruction of climate change in Central Asia over the last millennium with an annual resolution was made using geochemical and biological proxy in lake bottom sediments and tree-ring data. We investigated the lake in Central Asia- Teletskoe (Altai), Kucherla (Altai), Baikal, Arahlei (Chita) - and adjacent areas. Cores of bottom sediments were investigated by method of scanning X-ray fluorescent analysis with synchrotron radiation with the spatial resolution of 0.1 mm. It corresponds to the time resolution ~ 0.2-0.5 year. At each point analyzed more than 30 trace elements from K to U. Geochemical proxy of terrigenous, organogenous and aerosol components of sediments well correlated with regional meteodata for the last 100-150 years. Time series of lithological-geochemical indicators of climate change based on dating by 14C, 137Cs and 210Pb was calibrated by instrumental hydrometeorological data. We used tree-ring series together with element contents as an additional proxy for calculation of transfer function, considering that tree-ring series are response to summer temperature in this climatic zone. Annual temperature and precipitation change for the Central Asia region (0 - 1000 years ago) have been reconstructed using the transfer functions such as: time series proxy=function (temperature, precipitation).
Publisher
Surveying Geology & Mining Ecology Management (SGEM)
Subject
