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800-yr-long records of annual air temperature and precipitation over southern Siberia inferred from Teletskoye Lake sediments
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800-yr-long records of annual air temperature and precipitation over southern Siberia inferred from Teletskoye Lake sediments   (Citations: 5)
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A unique 800-yr-long record of annual temperatures and precipitation over the south of western Siberia has been reconstructed from the bottom sediments of Teletskoye Lake, Altai Mountains using an X-ray fluorescence scanner (XRF) providing 0.1-mm resolution timeseries of elemental composition and X-ray density (XRD). Br content appears to be broadly correlative with mean annual temperature variations because of changes in catchment vegetation productivity. Sr/Rb ratio reflects the proportion of the unweathered terrestrial fraction. XRD appears to reflect water yield regime and sediment flux. Sedimentation is rather continuous because annual clastic supply and deposited mass are the same. The artificial neural networks method was applied to convert annual sedimentary time-series of XRD, Br content, and Sr/Rb ratio to annual records of temperature and precipitation using a transfer function. Comparison of these reconstructed Siberian records with the annual record of air temperature for the Northern Hemisphere shows similar trends in climatic variability over the past 800 yr. Estimated harmonic oscillations of temperature and precipitation values for both historical and reconstructed periods reveal subdecadal cyclicity.
Journal: Quaternary Research - QUATERNARY RES , vol. 67, no. 3, pp. 400-410, 2007
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    • ...structive analyze elements under a sharp synchrotron beam combined with measurements of the X‐ray fluorescence [Daryin et al., 2005; Kalugin et al., 2005, 2007; Goldberg et al., 2007]...
    • ...[23] On the longer time scale, however, previous research researches proposed that Ti concentration is an indicator of physical weathering and precipitation [Dean et al., 2004; Selvaraj et al., 2007], and Rb/Sr ratio is an indicator of chemical weathering, and low Rb/Sr values indicating warm and humid climate [Goldberg et al., 2007; Daryin et al., 2005; Kalugin et al., 2005, 2007; Jin et al., 2006]...

    Guoqiang Chu, et al. Evidence for decreasing South Asian summer monsoon in the past 160 yea...

    • ...Using a variety of techniques and proxies, recent lacustrine sediments have been used to quantitatively infer, with high-temporal resolution, past precipitation (Kalugin et al. 2007; Nichols et al. 2009; Tonello et al. 2009) and temperature (Pla and Catalan 2005; Francis et al. 2006; Blass et al. 2007; Larocque and Finsinger 2008), as well as to qualitatively derive land management (Hyodo et al. 2008; Djamali et al. 2009; Striewski et al. ...

    S. Giralt, et al. Quantitative climate reconstruction linking meteorological, limnologic...

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