青藏高原隆升影响夏季大气环流的敏感性试验

THE SENSITIVITY EXPERIMENTS OF INFLUENCES OF UPLIFT OF TIBETAN PLATEAU ON CIRCULATION IN SUMMER

中文关键词:  青藏高原隆升  大气环流  敏感性试验  气候变化

英文关键词:Uplift of Tibetan Plateau  General circulation  Sensitivity experiments  Climate change

中文摘要:

      本文用球带范围的大气环流耦合模式,模拟了青藏高原隆升过程中大气环流的变化.模拟的结果表明,高原对大气的加热作用随着高原地形的升高而加强,而其中潜热加热的贡献占据第一位.高原隆升加剧了高原上空大气的上升运动,使高低空的高低压系统得到了加强,增强了南亚和东亚的季风强度,并且引起高原地区降水明显增加,地表面平均温度剧烈下降.尽管如此,青藏高原的隆升并没有从根本上改变大气环流形势,海陆分布才是形成当代大气环流及季风的根本因子.因此,要模拟地质历史时期气候状况,除了高原地形外,还须考虑更多的因子,尤其是海陆分布的变化.

英文摘要:

      A coupled general circulatin model in a zonal belt is used to simulate the variation of circulation features in the process of uplift of Tibetan Plateau.The results reveal that the heating rates of the Plateau increase with the rising of the Plateau topography, and the latent heating component in the heating field tends to be the most important heating factor.The uplift of Plateau enhances the upward motion,intensifiec the pressure systerns in the high and low level atmosphere,reinforces Southeast Asia monsoon strenth,increases precipitation and severely decreases the surface temprature over the Tibetan Plateau. However,the basic structures of the general circulations do not vary much due to the uplift of the Tibdtan Plateau,and it is the land-sea distribution that is the decisive factor to form the present circulation pattern and monsoon. Therefore to simulate the palaeclimateduring the geological period peopole should consider more factors,especially the land-sea distribution.