COMPARATIVE RESEARCH OF THE ENVIRONMENTAL CHANGES BETWEEN THE ARCTIC AND OTHER REGIONS IN THE NORTHERN HEMISPHERE SINCE THE LAST GLACIAL

The environmental changes after the last glacial have attracted many scientists°¯attention. In the unique geographical region, the climate changes of the Arctic may influence other regions in the world, especially the regions of the Northern Hemisphere, because they belong to the same atmospheric circulation system of the Northern Hemisphere. Many scientists are making effort to find the relationship of environmental changes between the Arctic areas and others, and some achievements have been gained. The Arctic sea ice has effect on the precipitation in China. Long-range variations of winter sea-ice extents in the Kara, the Barents Seas, Baffin Bay, and David Strait may influence rainfall over Haihe, Liaohe valley in August and over mid-up valley of the Yellow River in July, respectively, and the variations of sea-ice are anti-phase with that of rainfall. The Arctic ice has premonitory for the Meiyu forcast in the following 3-5 years and there is a significant teleconnection between the Meiyu and the one-year-lag Arctic ice area. The change of sea ice area during spring in this year and summer last year has greatest effect on the precipitation of Qinghai Province. In order to find the correlations of environmental changes between the Arctic and other regions in the Northern Hemisphere here we select ice cores of three sites in the Northern Hemisphere to compare with the GISP2 ice core since 100 kyr BP. There actually exist coincidences and differences in their environmental changes. Maybe different factors have forced the changes in different time scales. This research was financially supported by funding from National Natural Science Foundation of China(49971078).