Hydrology and Land Surface Studies
Paleoclimatic implications of an 850-year oxygen-isotope record from the northern Tibetan Plateau
Article first published online: 11 DEC 2007
Copyright 2007 by the American Geophysical Union.
Geophysical Research Letters
Volume 34, Issue 23, December 2007
How to Cite
2007), Paleoclimatic implications of an 850-year oxygen-isotope record from the northern Tibetan Plateau, Geophys. Res. Lett., 34, L23403, doi:10.1029/2007GL032228., , , and (
- Issue published online: 11 DEC 2007
- Article first published online: 11 DEC 2007
- Manuscript Accepted: 13 NOV 2007
- Manuscript Revised: 6 NOV 2007
- Manuscript Received: 2 OCT 2007
- oxygen isotopes;
 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 δ18O values could not have been the result of varying effective precipitation alone: changes in water temperature and in the δ18O 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.