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我国近30年龙卷风研究进展 总被引：5，自引：3，他引：2
从3方面总结了龙卷风研究成果:①研究概况,最初的龙卷风灾后调查到开展天气气候特征分析至近年来开展龙卷风本体结构、产生机制的探讨,获得了丰硕成果;②研究方法提高,从事实调查到利用统计方法,从利用台站常规观测资料到运用卫星、多普勒雷达、风廓线仪等非常规资料开展分析,近年数值模式WRF、ARPS等也被用来研究龙卷风,研究的方法手段不断得到改进;③龙卷风研究、预报面临的困难和未来展望。 相似文献
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In this study, we employed National Centers for Environmental Prediction(NCEP)/National Center for Atmospheric Research(NCAR) reanalysis data and records from the China Meteorological Administration(CMA)Yearbook of Tropical Cyclones to investigate three factors: sea-surface temperature(SST), vertical wind shear(VWS),and the density of the core convection(DCC), which are responsible for the rapid intensification(RI) of 1949-2013 offshore typhoons. Our analysis results of these composite factors show that in the environmental wind field the typhoons are far away from the outer strong VWS; in the SST field they are in the high SST area; and the core convective activity is robust and takes a bimodal pattern. The difference in RI between typhoons over the East China Sea(ECS) and the South China Sea(SCS) is a smaller VWS for the ECS typhoons, which may be one of the reasons why typhoons in the ECS are more intense than those in the SCS. Our study results indicate that SST, VWS, and DCC can result in an RI after a certain time interval of 36 h, 24 h to 30 h, and 24 h, respectively. The RI indicates a lag in the atmospheric response to oceanic conditions. This lag characteristic makes it possible to predict RI events. In summary, where the SST is high(≥28 ℃), the VWS is small, and the DCC is high, an RI will occur. Where mid-range SSTs occur(26 ℃≤SST≤28 ℃), with small VWS, and high DCC, the RI of typhoons is also likely to occur. 相似文献
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温州北登台风两类大降水分布的对比分析 总被引：1，自引：0，他引：1
着重对台风登陆后的路径进行分析,探讨其形成原因.了解台风登陆后运行路径、移动速度的不同,而产生温州地区降水分布的显著差异.通过分析,发现台风南部环流与西南暖湿气流的切变是引发台风登陆后大降水的主要原因,同时温州地形对该大降水亦有贡献作用. 相似文献
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运用排除法明确降水时段和非降水时段,然后利用卫星云图和雷达回波进行跟踪预测。本文运用数值预报产品、卫星云图、雷达回波、天气图对1998年梅汛期第一场暴雨进行短时预报研究,并对数值产品进行适当的订正。 相似文献
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When super typhoon Sepat came close to the Fujian coastline on the night of 18 August 2007 (coded as 0709 in Chinese convention), an associated tornado-like severe storm developed at 2307–2320 Beijing Standard Time in Longgang, Cangnan County, Wenzhou Prefecture, Zhejiang Province approximately 300 km away in the forward direction of the typhoon. The storm caused heavy losses in lives and property. Studying the background of the formation of the storm, this paper identifies some of its typical characteristics after analyzing its retrieval of Doppler radar data, vertical wind shear and so on. Synoptic conditions, such as unstable weather processes and TBB, are also studied. 相似文献
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台风“莫拉克”影响期间浙江大风成因分析 总被引：1，自引：0，他引：1
利用常规资料、浙江省自动站加密资料、NCEP/NCAR1°×1°每日4次再分析资料和多普勒天气雷达资料对2009年第8号台风“莫拉克”影响期间浙江大风的成因进行了分析。此次台风大风影响具有影响时间早、持续时间长、影响范围大和大风强度强的特点。副热带高压快速加强西进是造成台风大风提早出现的主要原因之一。鞍型场、3个台风相互影响使得“莫拉克”台风移速减慢,导致台风大风对浙江沿海的影响时间增长。“莫拉克”登陆福建后其西北侧华北高压以及东南侧海上高压的存在使得地面气压梯度维持,导致大风影响时间增长和影响范围增大。垂直方向环流将高层动量下传导致低层风速猛增。多普勒天气雷达径向速度产品VCP21进行速度退模糊后可以作为台风大风分布范围和极大风速预测的一个参考依据,预测时其在沿海海面效果要较内陆好。 相似文献
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介绍周世杰老中医运用药对诊治喉科疾病的经验。周老认为喉科疾病初期、急性期多为火邪作祟,具有发病急、变化快的特点,致病因素以风、火、痰、热为主,病性属实;缓解期及后期病性多虚实夹杂,包含气滞血瘀、肺肾阴虚、中气亏虚等。其治疗喉科疾病,在辨证选方基础上善用药对,以加强疗效。其常用药对有七对,如利咽疗喉药对：六角仙、卤地菊;清利湿热药对：黄蜀葵、积雪草;清热祛痰药对：胆南星、天竺黄;软坚散结药对：生牡蛎、海浮石;宣通鼻窍药对：鹅不食草、细辛;扶正补虚药对：仙鹤草、淫羊藿;解毒疗疮药对：连翘、马勃。临床应用药对治疗喉科疾病,疗效肯定,值得参考借鉴。 相似文献
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