青藏高原地形对5、6月北半球环流影响数值模拟  

Effect of Tibetan Plateau Topography on Northern Hemisphere General Circulation in May and June

作　　者：李萍云[1,2] 王亚非[1] 李琰[1] 

机构地区：[1]中国气象科学研究院灾害天气国家重点实验室,北京100081 [2]陕西省气象台,西安710015

出　　处：《气象科技》2010年第2期165-169,共5页Meteorological Science and Technology

基　　金：国家自然科学基金委项目(40675034);JICA中日政府间合作项目共同资助

摘　　要：利用NCAR CAM3.1模式进行了有无青藏高原地形的试验,通过两组试验结果的比较,研究了青藏高原地形对5、6月北半球500 hPa环流的影响。结论如下:春末夏初在北半球存在类似Rossby波列状的距平中心,5月波列产生于高原北侧的蒙古附近,途经鄂霍次克海、阿留申地区,到达北美西海岸;6月,由于西风急流北移、减弱及高原上空的非绝热加大,波列的产生地移至高原西北侧的巴尔喀什湖附近,强度减弱,造成该波下游的鄂霍次克海、勘察加半岛、阿拉斯加海域的强度相应减弱。另外,5月在鄂霍次克海和日本以东洋面附近的异常中心类似于负位相的OKJ波列,可以视为对正位相OKJ波列东段形成抑制作用;6月由于鄂霍次克海附近的负异常强度很弱,对OKJ波列东段的抑制作用很弱。The effects of the Tibetan Plateau topography on Eurasian atmospheric circulation are studied.The experiments with and without TP（CTL and NTP Experiments） are performed respectively by using an atmospheric general circulation model（NCAR CAM 3.1）.The results suggest： there are anomaly centers of the Rossby wave train from the Mongolia region,via Okhotsk Sea,Aleutian Islands to the west coast of North America in May;because the middle latitude westerly jet moves northward and weakens,and the Plateau diabetic heating is enhanced from May to June,the wavetrain-like height centers slightly changed their positions and weakened in June.Additionally,the wavelike anomaly centers around the Okhotsk Sea and the area off the east coast of Japan are similar to the positive-phase OKJ wave train,which can be considered being suppressed by the east section of the positive-phase OKJ wave train,strong in May and weak in June.

关 键 词：CAM3.1 模拟试验 高原 地形 波列 

分 类 号：P426.615[天文地球—大气科学及气象学]