LATE MIS 3 CLIMATE SIMULATIONS
MIS 3 晚期典型阶段气候模拟的初步研究

Geological records from China have proved that the late Marine Isotope Stage 3 (MIS 3) of 35ka B.P. should be characterized by a warm-wet climate and a large transgression. In this paper the late MIS 3 climate was simulated with a global nine-level atmospheric circulation model (AGCM+SSiB) on the basis of considering such conditions as insolation,glaciation, and surface conditions. The modeling results have deepened ours understanding of the MIS 3 climate and its influence factors. First, the annual temperature increased in most mid-low latitude areas. Temperature increase within Eurasian continent was mainly due to winter temperature increase, a contribution made by insolation through atmospheric circulations. Precipitation increase in low latitude monsoon areas benefited mostly from increased exchange of land-ocean moisture from south to north. Second, Quaternary icesheets not only caused temperature decline in high latitude areas,but also enhanced the south-north temperature difference caused by differential insolation. This produced a high transportation capability of moisture from the low latitudes to the high, resulting in increase of monsoon precipitation in the Tibetan Plateau,South Asia and Africa. Third, East Asian vegetation accelerated insolation-induced temperature raising in the low latitudes,but delayed icesheet-induced temperature decline in the high latitudes,resulting in enlargement of Eurasia precipitation areas and northward moving of Chinese rain-belts. Finally, Chinese climate shows such a pattern: with decrease of thermodynamic difference at the same latitude of Eastern China and the Pacific, a weakened east-west moisture transportation thus caused made the precipitation in eastern coastal areas of China dropping down, while with increase of temperature difference between the Eurasia continent and low latitude oceanic areas, a increased south-north moisture exchange thus caused was in favor of increasing precipitation in Chinese inland areas.