摘要
A close correlation between δ 18O in the shallow ice core in Dasuopu Glacier of the Tibetan Plateau and large scale SST is found. The marked correlated regions are mainly distributed in the ocean currents of the Oceans. The SST in different sea regions influences the precipitation and vapor origin of Dasuopu Glacier by way of its actions on atmospheric circulation. When the circulation situation favoring the transportation of oceanic vapor towards the glaciers of the southern Plateau appears, the δ18O in precipitation decreases, when that infavoring the transportation of oceanic vapor but favoring the transportation of the inland vapor towards the glaciers appears. the δ 18O in precipitation increases. Among various SST and circulation factors influencing δi8O in the ice core, the mean SST anomalies in the region A5 of the Northern Pacific Current and the position of the north boundary of Subtropical high over the South China Ocean have the important impact on the δ 18O in Dasuopu Glacier during midwinter,the mean SST anomalies in the region B of the Northern Pacific Current, the center position of the arctic vortex over the Northern Hemisphere and the strength of the arctic vortex over the Pacific have the important impact on the δ 18O in the Dasuopu Glacier during midsummer. The variations of these factors restrict the magnitude of δ 18O in the ice core, and their influence all have the omen.
A close correlation between δ 18O in the shallow ice core in Dasuopu Glacier of the Tibetan Plateau and large scale SST is found. The marked correlated regions are mainly distributed in the ocean currents of the Oceans. The SST in different sea regions influences the precipitation and vapor origin of Dasuopu Glacier by way of its actions on atmospheric circulation. When the circulation situation favoring the transportation of oceanic vapor towards the glaciers of the southern Plateau appears, the δ18O in precipitation decreases, when that infavoring the transportation of oceanic vapor but favoring the transportation of the inland vapor towards the glaciers appears. the δ 18O in precipitation increases. Among various SST and circulation factors influencing δi8O in the ice core, the mean SST anomalies in the region A5 of the Northern Pacific Current and the position of the north boundary of Subtropical high over the South China Ocean have the important impact on the δ 18O in Dasuopu Glacier during midwinter,the mean SST anomalies in the region B of the Northern Pacific Current, the center position of the arctic vortex over the Northern Hemisphere and the strength of the arctic vortex over the Pacific have the important impact on the δ 18O in the Dasuopu Glacier during midsummer. The variations of these factors restrict the magnitude of δ 18O in the ice core, and their influence all have the omen.
