EFFECT OF THE INDIAN PENINSULA ON THE COURSE OF THE ASIAN TROPICAL SUMMER MONSOON     

徐海明  何金海  董敏 《Acta Meteorologica Sinica》2001,(3)

In terms of the NCAR Community Climate Model (CCM3),the effect of the Indian Peninsulaon the course of the Asian tropical summer monsoon is simulated in this paper,and numericalexperimental results show that the Indian Peninsula plays a critical role in the establishmentprocess of the Asian tropical summer monsoon.When the CCM3 includes the Indian Peninsula,the model successfully simulates out the course of the Asian tropical summer monsoon,i.e.theSouth China Sea (SCS) summer monsoon at first bursts in middle May,while the Indian monsoonjust establishes until middle June.However when the Indian Peninsula topography is deleted in themodel,the Indian and SCS summer monsoons almost simultaneously establish in late May.Numerical results further indicate that in the former experiment the sensible heating of the IndianPeninsula warms the air above and produces evident temperature contrast between the peninsulaand its adjacent SCS and Bay of Bengal (BOB).which results in the strengthening and maintenanceof the BOB trough in the low-middle layer of the troposphere in the end of spring and early summerand thus the earliest establishment of the Asian tropical summer monsoon in the SCS in middleMay.However,the Indian summer monsoon just establishes until middle June when the strongwest wind over the Arabian Sea shifts northwards and cancels out the influence of the northwestflow behind the BOB trough.In the latter experiment the effect of Tibetan Plateau only produces avery weak BOB trough,and thus the SCS and Indian summer monsoons almost simultaneouslyestablish.  相似文献   

INTERDECADAL VARIATIONS OF INTERACTION BETWEEN NORTH PACIFIC SSTA AND EAST ASIAN SUMMER MONSOON   总被引：1，自引：0，他引：1  

李峰  何金海 《热带气象学报(英文版)》2001,7(1):41-52

Identification of key SST zones is essential in predicting the weather / climate systems in East Asia. With the SST data by the U.K. Meteorological Office and 40-year geopotential height and wind fields by NCAR / NCEP, the relationship between the East Asian summer monsoon and north Pacific SSTA is studied, which reveals their interactions are of interdecadal variation. Before mid-1970's, the north Pacific SSTA acts upon the summer monsoon in East Asia through a great circle wavetrain and results in more rainfall in the summer of the northern part of China. After 1976, the SSTA weakens the wavetrain and no longer influences the precipitation in North China due to loosened links with the East Asian summer monsoon. It can be drawn that the key SST zones having potential effects on the weather / climate systems in East Asia do not stay in one particular area of the ocean but rather shift elsewhere as governed by the interdecadal variations of the air-sea interactions. It is hoped that the study would help shed light on the prediction of drought / flood spans in China.  相似文献   

Sensitivity Experiments on Summer Monsoon Circulation Cell in East Asia   总被引：1，自引：0，他引：1  

何金海  李俊  朱乾根 《大气科学进展》1989,(1)

The East-Asian summer monsoon meridional circulation (SMMC) cell is simulated together with two vigorous rainbands in terms of a primitive-equation model including in itself a variety of diabatic heating, frictional dissipation and moist processes under the condition of mountains available. Results are comparable to observations. Also, performed are experiments with the reduction of water content, and exclusion of the cumulus convective process and mountain effect. Contrast analyses indicate that the cell is strongly sensitive to the condition of the humidity field in the atmosphere, more intensely at 120°than at 100°E, and the presence (absence) of the cumulus convection has considerable effect on the intensification(weakening) of the cell, with the mountain ranges exhibiting more influence upon the cell at 100° than 120°E. This may suggest that a great difference lies in the cause of the cell for the two meridions.  相似文献   

东亚地区低频振荡的经向传播及中纬度的低频波动   总被引：11，自引：3，他引：11  

何金海  杨松 《气象学报》1992,50(2):190-198

本文利用1981年6—9月欧洲中期天气预报中心(ECMWF)网格点资料分析了东亚地区低频(准40天)振荡的传播特性与结构特征,发现在120°E经度上的高空(低空)副热带地区有一个低频纬向风(经向风)经向传播的分离带(汇合带),指出中纬度低频纬向风振荡是准地转的,且高低空振荡同位相。同时揭示出:亚洲地区中纬度(35°N)高空低频纬向风的向东传播是波长为60—90个经度、移速为1.5—2.0个经度/d的中纬度低频波动东移的结果。这种低频涡旋移至东亚沿海地区常会发展,这种发展可能与急流中心附近正压不稳定能量的供给有关。  相似文献   

1982—1983年冬季亚澳地区低频振荡的分布与联系     

王坚红  何金海 《南京气象学院学报》1992,15(1):39-46

  相似文献   

夏季风场40—50天振荡的全球分布及波动特征   总被引：1，自引：0，他引：1  

徐建军  何金海 《南京气象学院学报》1992,15(3):358-367

  相似文献   

冬季亚洲-太平洋地区低频(30—60天)偶极子和低频涡旋活动特征     

何金海  张永新  徐建军 《南京气象学院学报》1993,(4)

根据1984—85年冬季欧洲中期预报中心的格点资料,采用带通滤波(30—60天)和合成分析方法研究了东亚西风急流的入口区和出口区的低频偶极子结构和亚太地区的低频涡旋活动特征。发现纬向风偶极子的低频循环伴随着东亚西风急流中心的东西摆动,在急流入口区的低频经圈环流对于纬向风振荡有重要作用。从乌拉尔经中亚到东亚存在一个西北一东南向的波列,源自乌拉尔地区的低频涡旋先是向南然后向东移动导致波列位相的转变。中太平洋地区存在一个经向波列,一对低频气旋和反气旋的逆时针打转导致该地区低频波列的转变。  相似文献   

夏季南海－菲律宾上空低频热源对东亚环流影响的数值试验     

姚永红  何金海  徐海明 《南京气象学院学报》1994,(4)

采用钱永甫ｐ－σ五层坐标原始方程模式，研究南海－菲律宾地区上空的低频热源对不亚大气环流的影响。结果表明，当低频热源处于加热位相时，对流层上层澳大利亚上空西风加强，对流层低层１２０°Ｅ处越赤道气流增强，副高位置偏北，此时低层，东南风影响我国东部沿海地区的降水；冷却位相时，对流层上层澳大利亚上空西风减弱，对流层低层越赤道气流减弱，副高位置偏南，此时低层西南风造成我国东部沿海的降水。  相似文献   

热带气象研究的进展和动向——1988年澳大利亚热带气象国际会议成果简介     

何金海 《南京气象学院学报》1988,(4)

由澳大利亚气象学会与海洋学会、中国气象学会和美国气象学会联合王办的热带气象国际会议于1988年7月4—8日在澳大利亚滨海城市布里斯班举行。除主办国学者外,还有英国、西德、法国、苏联、日本、印度、印尼、泰国、新西兰、加拿大、乌干达等国的代表参加,共有16个国家和地区的近200名学者与会。会议共收到论文200余篇。有176篇论文提要收入“会议论文摘要汇编”。我国共有14名学者赴会,有8人次在  相似文献   

多套土壤湿度替代资料在青藏高原的适用性分析     

王静  祁莉  吴志伟  施晓晖  何金海 《高原气象》2018,(2)

目前,仍没有一套公认的能够很好的描述高原土壤湿度变化特征的替代资料,为此利用收集到的多套观测资料作为参考,分别对各种替代资料在高原的适用性进行了评估。结果表明:(1)观测资料表明,高原的土壤湿度在表层、中层、深层的变化具有较好的一致性,表层与中层、中层与深层的土壤湿度相关系数均在0.8以上。(2)卫星反演资料SSM/I RETRIEVALS在各个站点与观测值的相关系数都为正,在高原东南部、中部、北部相关系数都在0.5以上,且标准差与高原东南和中部的观测标准差较为接近,适用于高原的大范围地区,是研究青藏高原土壤湿度多年变化特征的一套较好的替代资料。(3)春季高原土壤湿度的空间分布具有南部边缘较大、由东南向西北递减的特征,大部分地区的土壤湿度具有明显的线性增加趋势;去除趋势后,高原东、西各有一个均方差大值区,东、西关键区内的土壤湿度从春到夏都具有较好的持续性,可以作为预测我国夏季降水的重要因子。  相似文献