【摘 要】
：
A 149.8-m-long ice core was drilled at the accumulation area of Dasuopu glacier (28°23′N, 85°43′E, 7100 m a.s.l.) in the central Himalayas in 1997. The ice
【机 构】
：
Cold and Arid Regions Environmental and Engineering Research Institute,National Laboratory of Wester
【基金项目】
：
国家自然科学基金;国家自然科学基金;中国科学院知识创新工程项目
论文部分内容阅读
A 149.8-m-long ice core was drilled at the accumulation area of Dasuopu glacier (28°23′N, 85°43′E, 7100 m a.s.l.) in the central Himalayas in 1997. The ice core was analyzed continuously for stable isotopes (δ18O), cations (Na+, K+, Mg2+, Ca2+) and anions (Cl-,SO2-4,NO3-) throughout the core. Cycles indicated by δ18O, cations and anions were identified and counted as seasonal fluctuations as annual increment from maximum to maximum values. Reconstructed 300-year annual net accumulation from the core reveals a major precipitation trend for the central Himalayas with an average precipitation 750 mm per year. The trend, separated from the time series, shows a strong correlation to global temperature. Generally, as northern global temperature increases 0.1℃, the accumulation decreases about 80mm and vise versa. This may suggests that monsoon precipitation in Himalayas have decreased continuously in past decade as a response to global warming.
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