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HIGH-RESOLUTION RECONSTRUCTION OF CLIMATE CHANGE IN CENTRAL ASIA OVER THE PAST MILLENNIUM

AUTHOR/S: A. DARIN, I. KALUGIN, N. MAKSIMOVA, D. OVCHINNIKOV, E. VOLOGINA, N. RUDAYA, AL. PTITSYN, SV. RESHETOVA, Y. RAKSHUN, K. ZOLOTAREV
Sunday 1 August 2010 by Libadmin2010

10th International Multidisciplinary Scientific GeoConference - SGEM2010, www.sgem.org, SGEM2010 Conference Proceedings/ ISBN 10: 954-91818-1-2, June 20-26, 2010, Vol. 1, 55-60 pp

ABSTRACT

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).

Keywords: sedimentation, SRXRF scanning, geochemical indicators, tree-ring width chronology.

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