THE STUDY OF STORM RAINFALL CAUSED BY INTERACTION BETWEEN THE NON-ZONAL HIGH LEVEL JET STREAK AND TYPHOON IN THE DISTANCE   总被引：1，自引：1，他引：1  

丁治英  张兴强  何金海  徐海明 《热带气象学报(英文版)》2001,7(2):187-198

In this paper, statistics were analyzed concerning correlation between the storm rainfall far from typhoon and non-zonal upper-level jet stream. The results show that the jet stream at 200 hPa is constantly SW (90.2 %) during the period in which storm rainfall occurs. Rainfall area lies in the right rear regions of the jet axes. While the storm intensifies, the jet tends to be stronger and turn non-zonal. With the MM4 model, numerical simulation and diagnosis were carried out for Typhoon No.9711 (Winnie) on August 19 to 20, 1997. The distant storm rainfall is tightly correlative to the jet and low-level typhoon trough. The divergence field of jet is related to the v component. The upper level can cause the allobaric wind convergence at low level. This is the result of the form of low-level typhoon trough and the strength of the storm. By scale analysis, it is found that there is a branch of middle scale transverse inverse circulation in the right entrance regions behind the jet below the 300-hPa level, which is very important to the maintenance and strengthening of storm rainfall. This branch of inverse circulation is relative to the reinforcement of jet's non-zonal characteristics. From the field of mesoscale divergence field and non-zonal wind field, we know that the stronger symmetry caused by transverse circulation in the two sides of the jet, rainfall’s feedback and reinforcement of jet’s non-zonal characteristics had lead to positive feedback mechanism that was favorable of storm rainfall’s strengthening.  相似文献   

非常定自适应网格模式在台风路径数值预报中的应用   总被引：7，自引：0，他引：7  

刘卓  曾庆存 《大气科学》1995,19(3):301-308

本文将作者在前文中介绍的非常定自适应网格模式用于台风路径的数值预报。由于自适应网格在台风中心附近安排了较密的网格，有效地提高了网格的分辨率，使得台风环流的结构在预报48小时以后仍能保持，其预报的路径与实况相比令人鼓舞。  相似文献   

台湾岛地形对台风移动路径的作用   总被引：27，自引：3，他引：27       下载免费PDF全文

罗哲贤  陈联寿 《大气科学》1995,19(6):701-706

本文用一个β平面准地转正压模式实施了九组试验，研究台湾岛地形对台风移动路径的作用。初始场系根据SPECTRUM和TCM-90期间加强观测资料确定。结果表明:台湾岛地形的引进会使台风路径向右偏移；地形使台风环流的最大风速区向台风中心方向推移，造成台风环流空间尺度减小，这个结构的变化是路径右偏的一个可能原因。  相似文献   

攀钢,攀矿场地边坡地震稳定性研究     

马声浩  雷建成 《四川地震》1993,(2):1-11

本文在总结分析攀钢、攀矿昔格达层滑坡基本特征的基础上,对区内滑坡进行了地震稳定性计算,给出了经不同方法治理后的滑坡的地震稳定系数;同时采用“因子迭加”方法对究研区进行边坡稳定性区划,划分出相对的稳定区、欠稳定区和不稳定区,为抗震减灾和土地的开发利用提供了科学依据。  相似文献   

NUMERICAL SIMULATION OF MESOSCALE STRUCTURES OF TYPHOON AND OROGRAPHIC EFFECTS USING MM5^*          下载免费PDF全文

Wang Pengyun 《Acta Meteorologica Sinica》1999,13(4):474-493

The track,landfall,dynamic and thermodynamic and cloud-rain physical mesoscale structures and their evolution of typhoon HERB 1996 in 36 h from 0000 UTC 31 July to 1200 UTC 1 August 1996 were simulated by using the non-hydrostatic mesoscale model MM5.This period covered the process of typhoon HERB landfall at Taiwan and Fujian Provinces.Results show that the model successfully simulated the landfall process of typhoon HERB,revealed the most important characteristics of the mesoscale dynamic and thermodynamic and cloud-rain physical structure during its landfall.The simulated typhoon track was close to the observation.The center of cyclonic circulation simulated at 0000 UTC on 1 August 1996 (24 h integration) was located in shore near Fuqing,Fujian Province at which the typhoon was reported to landfall two hours later.It shows that strong upward motion formed by low level convergence existed in the eye-wall and subsidence at the eye.The wind field shows clear asymmetrical structure near the typhoon center.The cloud and rainband was screw-typed distributed around typhoon center,and consisted of meso-β scale rain cores.During the period of typhoon HERB staying near and passing over Taiwan,the lower cloud was developed in the eye region so that the previous clear typhoon eye on the satellite pictures became fuzzy.Observation shows that the typhoon center was "warm",but the model simulations with higher space resolution show that in the mid-troposphere the region of eye-wall with stronger upward motion and more cloud-and rain-water was warmer than the eye.During the period of typhoon passing over Taiwan and its following landfall at Fujian,the track of model typhoon deviated about 30 km northward (i.e.,rightward) because of the orographic effects of Taiwan Island,but the strength of the typhoon was not affected remarkably.The amount of rainfall on Taiwan in the 36 h simulations was enhanced more than six times by the orographic lifting of Taiwan Mountain.  相似文献   

TYPHOON ACTIVITY IN NORTHWEST PACIFIC IN RELATION WITH EL NINO AND LA NINA EVENTS     

何敏  宋文玲  陈兴芳 《热带气象学报(英文版)》1999,5(2):153-162

Statistic and typical-year composition methods are used to study the northwest Pacific typhoon activities in relation with the EI Niño and La Niña events. The result indicates that the typhoon tends to be inactive in the EI Niño years and active in the La Niña years and it is also dependent on the onset and ending time and intensity of the events and areas of genesis of typhoons. With statistic features of the frequency of typhoon activity in the EI Niño and La Niña years and the time-lag correlation between the frequency and sea surface temperature(SST), useful information is provided for the prediction of typhoon occurrence. In addition, the singular values disassemble(SVD)method is applied to study the correlation between the geopotential field and SST field. The result shows that the air-sea coupling in the EI Niño years is unfavorable for the typhoon to develop. Which take place with a smaller number. Opposite situations are found with the La Niña years.  相似文献   

台风“利奇马”不同强降水中心的雨滴谱特征分析     

申高航  高安春  李君 《气象科学》2020,40(1):106-113

在2019年台风“利奇马”台风暖区、台风与西风槽相互作用区及西风槽影响区分别挑选4个极端强降水中心,利用各站连续观测分钟雨滴谱资料和分钟降水资料,分析了不同站点和不同降水时段的雨滴尺度谱、雨滴速度谱、雨滴尺度—时间谱和雨滴速度—时间谱特征,研究了雨滴谱特征随时间的变化。结果表明:4个降水中心的雨滴尺度—时间谱和雨滴速度—时间谱存在明显差异,而过程的统计谱特征差异不明显;过程中不同区域的站点、同一站点不同的降水时段,雨滴尺度谱和雨滴速度谱主要为双峰型,尺度谱双峰中各站对应1.2 mm直径峰的位置一致,处于较小尺度峰的位置不一致;在较大雨强时,雨滴尺度谱上会出现单峰和三峰的情况,但比例较少;1.2 mm雨滴的高浓度区域与地面降水强度有非常好的对应关系,在1.2 mm雨滴的高浓度区域形成的过程中,地面降水逐渐增强,随着1.2 mm雨滴的高浓度区域逐渐瓦解,地面降水逐渐减弱,直至出现间歇。  相似文献   

登陆过程中热带风暴"黄蜂"螺旋云带的分析   总被引：2，自引：2，他引：0  

陈子通 《热带气象学报》2003,19(Z1):56-64

分析了热带风暴"黄蜂"在登陆过程中逐小时高分辨红外云图上的螺旋云带及其强对流云团的变化规律.从强对流云团发展为主螺旋云带的演变过程中,螺旋云带主要表现为其前端的对流逐渐加强,其余部分逐渐减弱,以及前端的强对流云团总体表现为旋入运动且维持时间较长,而其余部分的云团总体表现为远离中心等的特征.初步探讨了螺旋云带结构变化与风暴强度之间的关系和"黄蜂"在登陆后迅速减弱的可能原因.  相似文献   

0103号台风"榴莲"路径与致洪暴雨成因分析     

陈见  郑凤琴  钱俊 《气象研究与应用》2003,24(1):5-7

通过对0103号台风"榴莲"的路径及特大暴雨天气的环流背景分析,认为造成这次致洪暴雨过程的最主要的天气原因是:深厚的副热带高压使台风偏向西行进入广西,与正在爆发的西南季风云系相遇,从而使降雨量大幅度增加,引发了广西南部特大洪水过程。  相似文献   

台风“榴莲”暴雨的湿位涡诊断分析     

农孟松  曾小团 《气象研究与应用》2002,23(1):13-14

分析 2 0 0 1年 7月 2 - 3日台风“榴莲”暴雨过程中湿位涡及其各分量的变化 ,发现对流层低层 85 0 h Pa湿位涡的负值中心、 70 0 h Pa湿位涡的正值区与强降水中心相对应 ;急流与层结稳定度的变化 ,影响着湿位涡的变化  相似文献