Climate of the Past Discussions www.clim-past-discuss.net 1814-9340 1814-9359 5 3 2009 10.5194/cpd-5-1493-2009 http://www.clim-past-discuss.net/5/1493/2009/ http://www.clim-past-discuss.net/5/1493/2009/cpd-5-1493-2009.html http://www.clim-past-discuss.net/5/1493/2009/cpd-5-1493-2009.pdf 1493 1520 2009-05-25 Synchronous variations of precipitation and temperature at Lake Qinghai, NE Tibetan Plateau during the past 800 years and their relations to solar activity: evidence from Li/Ca ratios and &delta;¹⁸O values of ostracod shells Z. Zhu J. Chen chenjingan@vip.skleg.cn J. Li Y. Zeng J. Li J. Wang L. Qi The State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China Graduate School of Chinese Academy of Sciences,Beijing 100049, China The State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China Variations of precipitation and temperature at Lake Qinghai, NE Tibetan Plateau on decadal scales during the past 800 years were reconstructed based on the oxygen isotope values and Li/Ca ratios from ostracod shells of the single species <i>Eucypris inflata</i>. Higher temperature relates to lower Li/Ca ratios; higher precipitation relates to lower &delta;¹⁸O values, and <i>vice versa</i>. The good correlation between Li/Ca ratios and &delta;¹⁸O values of ostracod shells indicates that temperature variations corresponded well with precipitation variations on decadal scales during the past 800 years. Variations of precipitation and temperature are synchronous with variations of solar activity reconstructed from the atmospheric ¹⁴C concentration in tree rings and the ¹⁰Be concentration in ice cores. These findings suggest that, on decadal scales solar activity may be responsible for the synchronous variations of precipitation and temperature at Lake Qinghai, NE Tibetan Plateau during the past 800 years. Keywords: Precipitation variations; Temperature variations; <i>Eucypris inflata</i>; Li/Ca; &delta;¹⁸O; Synchronous variations; Lake Qinghai; Solar activity. Bard, E., Raisbeck, G., Yiou, F., and Jouzel, J.: Solar irradiance during the last 1200 years based on cosmogenic nuclides, Tellus, 52B, 985–992, 2000. Broecker, W. S. and Peng, T. H.: Tracers in the Sea, Eldigio Press, New York, 1982. Chen, J. A., Wan, G. J., Wang, F. S., Huang, R. G., Zhang, F., Zhang, D. D., and Schmidt, R.: Environmental records of carbon in recent lake sediments, Sci. China (Ser. D), 45, 875–884, 2002. 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