摘要
青藏高原隆升对西北干旱区大气环流影响的研究,对于理解西北干旱区的成因有重要的意义。本文通过三个数值试验,初步探讨了高原隆升前和隆升至临界高度时,北半球特别是我国西北地区大气环流场与现在的差异。结果表明,青藏高原隆升对北半球特别是西北地区海平面气压场、500hPa高度场、100hPa高度场有明显的影响;高原隆升前和隆升至临界高度时,北半球绝大部分地区海平面气压场、500hPa高度场、100hPa高度场都比现在偏低。不同季节时,各环流场变化的情况也基本一致。高原隆升至临界高度时已经对北半球特别是西北地区的环流形势产生了较大的影响,这将导致西北地区气候条件发生较明显的变化。
To understand the forming causes of the Northwest China(NW China) drought area and to study the influence of the QinghaiXizang Plateau uplifting on the general circulation NW China. In this paper, the general circulation differences over the Northern Hemisphere, especially the China, among before, during and after the QinghaiXizang Plateau uplifting is simulated by 3 numerical simulation experiments of NCAR CCM3. The results show that the uplifting of the QinghaiXizang Plateau can clearly effect the general circulation of the Northern Hemisphere especially the NW China, such as the sea level pressure, 500 hPa and 100 hPa levels. Before the QinghaiXizang Plateau is uplifted or during it is uplifted up to the critical height, about 2 km ASL, the sea level pressure, 500 hPa and 100 hPa level heights are all lower than they are now all over the most part of the Northern Hemisphere. And the changes are all consistent with each other in every season. It can clearly effect the general circulation of the Northern Hemisphere, especially the NW China; when the QinghaiXizang Plateau is uplifted up to the critical height. This will make the climate condition to be clearly changed.
出处
《高原气象》
CSCD
北大核心
2003年第B10期45-57,共13页
Plateau Meteorology
基金
中国气象局成都高原气象研究所高原气象开放实验室基金
成都信息工程学院人才引进项目(KY/LX2002082801)资助
关键词
青藏高原隆升
西北干旱区成因
大气环流场变化
数值模拟
临界高度
Uplifting of the Qinghai-Xizang Plateau
Forming causes of NW China drought area
General circulation change
Numerical simulation
Critical height
