Monsoon variability in the Himalayas under the condition of global warming

An ice core-drilling program was carried out at the accumulation area of Dasuopu glacier (28degrees23'N, 85degrees43'E, 7100 m a.s.l.) in the central Himalayas in 1997. The ice core was analyzed continuously for stable isotopes (delta(18)O), and major ions throughout the core. Cycles indicated by delta(18)O, cations were identified and counted as seasonal fluctuations as annual increment from maximum to maximum values. Reconstructed 300-year annual net accumulation (water equivalent) from the core, with a good correlation to Indian monsoon, reflects a major precipitation trend in the central Himalayas. The accumulation trend, separated from the time series, shows a strong negative correlation to Northern Hemisphere temperature. Generally, as northern hemisphere temperature increases 0.1degreesC, the accumulation decreases about 80 nun, reflecting monsoon rainfall in the central Himalayas has decreased over the past decades in the condition of global warming.