一次大范围强对流天气的中尺度分析   总被引：1，自引：0，他引：1  

江吉喜 《气象》1993,19(9):35-39

运用１小时间隔的数字红外云图和常规气象资料，分析了１９９２年４月２０－２２日造成我国中南部地区一次较大范围强风雹天气中的中尺度对流系统活动，展示了卫星资料与常规气象资料相结合，中尺度天气分析和临近预报中的潜力。  相似文献   

登陆北上影响山东的9216号强热带风暴   总被引：3，自引：1，他引：3  

张少林  顾润源 《气象》1993,19(10):29-32

对北上影响山东造成重大灾害的９２１６号强热带风暴进行了分析。涡度诊断分析和能量场分析表明，该热带风暴低压一直沿着正涡度中心及高能轴方向移动。暴雨中心集中在高能舌顶热附近，并与正涡度中心相一致。  相似文献   

吉林省对流性天气的分布特征及地形影响机制   总被引：1，自引：1，他引：1  

谢静芳  王晓明 《气象》1994,20(8):43-47

通过对吉林省强对流天气和对流性天气活动与地形关系的分析，初步揭示出地形对两类对流天气的影响机制，其结果对进一步分析研究和准确预报强对流天气具有重要意义。  相似文献   

NUMERICAL SIMULATION STUDY OF THE OCCURRENCE AND DEVELOPMENT OF A MID-TROPOSPHERIC CYCLONE OVER THE SOUTH CHINA SEA          下载免费PDF全文

Yan Jinghu  Li Chongyin 《Acta Meteorologica Sinica》1994,8(2):150-160

In this paper,the processes of the occurrence and development of a mid-tropospheric cyclone (MTC hereinafter)over the South China Sea are successfully simulated,adopting the convective heating profile calculated from the ana-lysed data.And a series of numerical experiments show that the convective heating rate, especially its vertical profile,plays a key role in the occurrence,development and maintenance of the MTC.When there is highly concentratedconvective heating in middle layer(400—450hPa),the MTC could occur and maintain for longer time.And the key tosuccessfully predict the MTC by numerical model is to correctly specify the convective heating profile in the model.  相似文献   

Interactions between the 30–60 day oscillation,the walker circulation and the convective activities in the tropical western pacific and their relations to the interannual oscillation   总被引：5，自引：0，他引：5  

Huang Ronghui 《大气科学进展》1994,11(3):367-384

In this paper, interactions between the 30-60 day oscillation, the Walker circulation and the convective activities in the tropical western Pacific during the Northern Hemisphere summer are analyzed by using the observed data of wind fields and high-cloud amounts for the period from 1980 to 1989.The analyzed results show that the 30-60 day oscillation (hereafter called LFO) may be largely affected by the convective activities in the tropical western Pacific. The LFO in the tropical western Pacific during the strong convective activities around the Philippines stronger than those during the weak convective activities around the Philippines. Moreover, in the case of strong convective activities around the Philippines, the LFO in the tropical west-ern Pacific and tropical eastern Indian Ocean generally propagates westward, and it is intensified by the LFO with a westward propagating center of maximum oscillation from the east to 140oE. However, in the case of weak convective activities around the Philippines, the LFO gradually becomes stronger with a eastward propagating center of maximum oscillation from the eastern Indian Ocean to the tropical western Pacific.Corresponding to the 30-60 day oscillation, the Walker circulation is also in oscillation over the tropical Pacific and its circulation cell seems to shift gradually westward from the tropical western Pacific to the tropical eastern In-dian Ocean with strong convective activities around the Philippines. This may maintain the intensification of convective activities there. However, during the weak convective activities around the Philippines, the Walker circula-tion gradually moves eastward and an ascending flow may appear in the equatorial central Pacific. This may cause convective activities to be intensified over the equatorial central Pacific.The analyzed results also show that the LFO in the tropical western Pacific and East Asia may be associated with the interannual oscillation of the SST anomaly in the tropical western Pacific.  相似文献   

热带太平洋海域感热、潜热通量的时空特征^*     

曲维政  李若钝 《地理研究》1994,13(4):1-7

本文利用“中美热带西太平洋海气相互作用研究”第1-8航次海面气象观测资料,计算分析了热带太平洋感热潜热通量的时空特征.分析结果表明在赤道海域,潜热通量远远大于感热通量.潜热和感热通量是从海面向大气输送的,且具有明显的年际变化和季节变化,日变化变幅甚小.  相似文献   

The kinetic energy budget of monsoon circulation over the Indian region during ISMEX-1973     

S. S. Singh  A. A. Kulkarni  A. Bandyopadhyay 《Pure and Applied Geophysics》1980,119(1):16-23

A kinetic energy budget over the Indian region is computed for the period 4–9 July 1973, when a twin monsoon depression-one in the Bay of Bengal and another in the Arabian sea were the dominant synoptic features. The generation term caused by the cross-contour flow is a dominant source to the kinetic energy. The dissipation term is computed as a residual and is a major sink for the kinetic energy. The horizontal flux divergence is also a sink term but is much smaller in magnitude than other major source and sink terms. From the results it may be inferred that the generation term is the most important for the maintenance of monsoon disturbances.  相似文献   

On the scavenging of SO2 by cloud and raindrops: I. A theoretical study of SO2 absorption and desorption for water drops in air     

C. J. Walcek  H. R. Pruppacher 《Journal of Atmospheric Chemistry》1983,1(3):269-289

An extention of our previous theory for trace gas absorption into freely-falling cloud and raindrops is presented. This theory describes the convective diffusion of a trace gas through air and into a water drop with internal circulation, the drop falling at its terminal velocity. Using flow fields for the circulating water inside and for the moving air outside the drop, obtained by numerical solutions to the Navier—Stokes equation of motion, we numerically solved the convective diffusion equation to determine the uptake of SO₂ by water drops of various sizes, time exposure to the gas phase, and concentration of SO₂ in the gas phase. It was found that for drops of radius larger than 1 mm and relatively low gas concentrations (10 ppb (v)), resistance to gas diffusion lies mainly in the gas phase; while for drops of radius less than 500 m and gas concentrations larger than those found in the atmosphere (1% (v)), the resistance to diffusion lies primarily in the liquid phase. With drop sizes and gas concentrations between these limits, the rate of SO₂ uptake is controlled by a coupled resistance to diffusion inside and outside the drop. In addition to our general model, a simplified version was formulated which allows considerable savings in computer time for evaluation and improved ease of handling without significant loss of accuracy. A comparison between our simplified model and that of Barrie (1978) shows that the boundary-layer approach of Barrie may be a useful alternate approach to estimating trace gas absorption by water drops, provided appropriate values are chosen for the thickness of the boundary layers involved.  相似文献   

登陆广东热带气旋中尺度降水分布变化特征   总被引：11，自引：1，他引：10  

林爱兰  丁伟钰  万齐林  梁建茵  何溪澄 《气象》2004,30(10):33-37

利用每小时地面观测资料和卫星遥感资料 ,以 1 999～ 2 0 0 1年在珠江三角洲地区登陆的热带气旋为研究对象 ,从合成分析和个例分析两方面揭示了登陆广东热带气旋降水的中尺度特征及其分布变化。结果表明 ,热带气旋登陆前后中尺度强降水分布发生明显变化 ,登陆后降水不对称性加大 ;热带气旋登陆后中尺度强降水分布随时间变化 ,登陆后第 1 0个小时之前 ,中尺度强降水基本上分布于热带气旋中心附近 ;而热带气旋登陆第 1 0个小时之后 ,中尺度强降水具有明显的“离心”或“偏心”特征。  相似文献   

人工增雨综合技术研究   总被引：15，自引：1，他引：14       下载免费PDF全文

王广河  姚展予 《应用气象学报》2003,14(Z1):1-10

"人工增雨综合技术预研究"项目对人工增雨云水资源的开发潜力、人工增雨的科学模型及其数值模拟、人工增雨监测识别技术、人工增雨催化作业技术、人工增雨外场试验的科学设计和南方夏季对流云人工增雨潜力区识别技术等方面进行了综合研究,在此基础上初步优选和集成了人工增雨成套技术,并在抗旱型和蓄水型人工增雨外场试验中进行了初步应用,取得了较好的实用效果.  相似文献