Paleoclimatic implications of an 850-year oxygen-isotope record from the northern Tibetan Plateau

Details Paleoclimatic implications of an 850-year oxygen-isotope record from the northern Tibetan Plateau Paleoclimatic implications of an 850-year oxygen-isotope record from the northern Tibetan Plateau

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007georl..3423403h&link_type=abstract

Geophysical Research Letters, Volume 34, Issue 23, CiteID L23403

Mathematics

Logic

7

Paleoceanography: Continental Climate Records, Oceanography: Biological And Chemical: Stable Isotopes (0454, 1041), Hydrology: Hydroclimatology

Scientific paper

Oxygen-isotope records from the sediments of hydrologically-closed lakes are commonly interpreted in terms of changing effective precipitation. We compare an 850-year-long oxygen-isotope record derived from ostracode carbonate from the sediments of Sugan Lake, in the northern Tibetan Plateau, with tree-ring and ice core evidence for changing temperature, precipitation and isotopic composition of the lake's inflow. Taking into account all of these independent records, we show that variations in the carbonate δ 18O values could not have been the result of varying effective precipitation alone: changes in water temperature and in the δ 18O of source waters also played a significant role. Where independent records of temperature, precipitation or the isotopic composition of input waters are unavailable, care should be taken to avoid simplistic interpretations of carbonate stable isotope records, as these may contribute to incorrect paleoclimatic reconstructions.

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