摘要
本文利用有限区域有地形的5层原始方程模式,对青藏高原地区地表热状况在夏季东亚大气环流中的作用进行了一些数值试验和分析。结果表明:高原地面反照率、拖曳系数、蒸发系数以及土壤温度等的变化对大气加热增强时可造成高原上空及孟加拉湾一带的大气热源显著增强;对流层上层的青藏高压增强范围变大,并向西北方向偏移;热带东风急流加强北移;对流层低层西南季风加大;索马里、印度南侧和澳大利亚北侧的越赤道气流也增强;海平面上的大陆低压加深。同时,中南半岛地区及江淮流域的上升运动增强,降水增大,而我国东南沿海一带上升运动减弱,降水减少。
In this paper we have performed numerical experiments of influences of different heating characteristics on ground surface of Tibetan Plateau on the general circulations over SE-Asia using a limited area five-layer primitive equation model with topography and combined P-σ vertical coordinates. The results show that the heating effects enhanced by the albedo, drag coefficient, evaporation coefficient and the ground temperature, can strengthen the atmospheric heating source over Tibet Plateau as well as Bengal region considerably. It causes the Tibet High on upper level of troposphere to strengthen and advance northwestward, tropical easterly jet to intensify and shift northward, the SW monsoon on lower troposphere to enlarge, both the Somali jet and cross-equatorial flow south of India and north of Australia to enhance, and the sea-level low on land to be deepened as well. Meanwhile, over Indo-China peninsula and valleys of both Yangtse River and Huai He, the upward motion becomes stronger and precipitation gets heavier, but over SE coast of China, the reverse is true.
出处
《高原气象》
CSCD
北大核心
1989年第3期205-216,共12页
Plateau Meteorology
关键词
大气环流
数值模似
地表热状况
Numerical simulation
General circulationj Qinghai-Xizang Plateau
Surface thermal conditions
