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N-alkanes
Lacustrine sediments
Delta d
Tibetan plateau
Paleoclimate
Stable isotopes
Delta-d
Climate variability
Surface sediment
Aquatic plants
D/h ratios
Leaf waxes
Water
Precipitation
Abstract:
The hydrogen isotopic composition (delta D) of leaf water used for biosynthesis of n-alkanes can be modified by climate. Therefore, the delta D call be considered Lis potential paleoclimatic proxy to explore. We compared measured delta D Values of alkalies (n-C-25 to n-C-31) extracted front a short sediment profile spanning the past 50 years with a 7-year resolution from Lake Yamzho, Southern Tibetan Plateau. Climatic control was reconstructed using meteorological records of the nearby Langkazi and Lhasa weather stations. We found that the delta D values of the n-alkanes correlated with the mean annual air temperature and significantly correlated with the mean growing season air temperature. Oil the other hand, the delta D values show poor correlations with both rainfall amount and relative humidity. These results indicate that stable isotope composition of n-alkanes Could be ail excellent proxy for paleotemperature reconstruction. [References: 54]
