摘要
Previous studies found extremely high d-excess in both ice core and glacial melt water in Dasuopu glacier, Xixiabangma, middle of Himalayas. These values are much higher than the global average and those measured in southwest monsoon precipitation. The d-excess variation in over one year at Nyalam station will clarify this phenomenon. Studies show that the high d-excess is related to the seasonal variation of moisture transport to this region. The d-excess values are low during the southwest monsoon active periods, when moisture originated from the humid ocean surface. The d-excess values are higher in non-monsoon months, when moisture is derived from westerly transport. Winter and spring precipitation accounts for a substantial portion of the annual precipitation, resulting in higher d-excess in the yearly precipitation in the middle of Himalayas than other parts of the southern Tibetan Plateau. This finding reveals that the precipitation in the middle of Himalayas is not purely from southwest monsoon, but a large portion from the westerly transport, which is very important for ice core study in this area.
Previous studies found extremely high d-excess In both ice core and glacialmelt water in Basuopu glacier, Xixiabangma, middle of Himalayas. These values are much higher thanthe global average and those measured in southwest monsoon precipitation. The d-excess variation inover one year at Nyalam station will clarify this phenomenon. Studies show that the high d-excess isrelated to the seasonal variation of moisture transport to this region. The d-excess values are lowduring the southwest monsoon active periods, when moisture originated from the humid ocean surface.The d-excess values are higher In non-monsoon months, when moisture is derived from westerlytransport. Winter and spring precipitation accounts for a substantial portion of the annualprecipitation, resulting in higher d-excess in the yearly precipitation in the middle of Himalayasthan other parts of the southern Tibetan Plateau. This finding reveals that the precipitation in themiddle of Himalayas is not purely from southwest monsoon, but a large portion from the westerlytransport, which is very important for ice core study in this area.
基金
This work was supported by the National Natural Science Foundation of China(Grant No.40271025)
the Innovation Program of the Chinese Academy of Sciences(Grant No.KZCX3-SW-339)
the Collective Innovation of National Natural Science Foundation of China(Grant No.40121101)
the Ministry of Science and Technology of the People's Republic of China(Grant No.2001CCB711001)
China Scholarship Council.
关键词
喜马拉雅山
湿气
传送器
氘过剩
middle of Himalayas
precipitation
deuterium excess
ice core record
