| Abstract: | Continuous precipitation was sampled at several stations in the southern Tibetan plateau to study the variation of stable isotope in precipitation. Our work shows that there is a strong signal of monsoon precipitation in the stable isotope of precipitation, which is quite different from that in other regions in the Tibetan plateau. The spatial variation, the seasonal variation of δ 18 O and the relationship between δ 18 O in precipitation and local meteorological parameters are all affected by monsoon precipitation in the south of Tibetan plateau.From the spatial variation, precipitation samples were collected from a dozen stations from south to north of the Tibetan plateau. A strong spatial variation of stable isotope in precipitation has been found. Extremely low value of δ 18 O in precipitation in the south of Tibetan plateau can be seen which can be contributed to the monsoon precipitation in the south of Tibetan plateau. The strong precipitation in the south slope of Himalayas Mts. depleted heavily the heavy stable isotope which resulting in very low δ 18 O in precipitation in the south of Tibetan plateau. This work also shows that the monsoon precipitation can affect effectively as far as to the Tanggula Mts. in the middle of the Tibetan plateau. |
