西北太平洋一个超强爆发性气旋的分析

发布时间：2019-05-28 20:32

【摘要】：利用NCEP(National Centers for Environmental Prediction)提供的CFSv2(Climate Forecast System Version 2)资料和日本高知大学提供的MTSAT-1R(Multi-functional Transport Satellites-1R)卫星红外波段反照率资料,对2013年1月发生在西北太平洋上的一个超强爆发性气旋进行了研究,利用天气分析和诊断分析等方法,详细分析了该爆发性气旋的结构特征。发现该气旋在爆发性发展的后期位于高空急流的北侧,高空的强辐散有利于气旋的发展。气旋上空500hPa的低压槽在14日12UTC显著加深,槽前的正涡度平流有利于海平面气压降低。与气旋伴随的冷锋存在鼻状结构,在800hPa以下,假相当位温随高度降低,低层大气呈对流性不稳定状态。利用涡度方程对气旋进行诊断分析,发现平流项和拉伸项为气旋涡度变化的主要贡献项。设计了围绕气旋中心15(°)×15(°)的区域,发现不同时刻的沿区域四边积分的环流、区域内面积平均的非绝热加热、水汽通量散度和垂直速度4个物理量存在正反馈过程,即气旋爆发性发展的前期存在类似CISK的正反馈机制。
[Abstract]:Using the CFSv2 (Climate Forecast System Version 2) data provided by NCEP (National Centers for Environmental Prediction) and the infrared band albedo data of MTSAT-1R (Multi-functional Transport Satellites-1R) satellite provided by Kaozhi University of Japan, A super explosive cyclone occurred in the Northwest Pacific in January 2013 was studied. the structural characteristics of the explosive cyclone were analyzed in detail by means of weather analysis and diagnostic analysis. It is found that the cyclone is located on the north side of the upper jet in the later stage of explosive development, and the strong divergence at high altitude is beneficial to the development of the cyclone. The low pressure trough of 500hPa over the cyclone deepened significantly on the 14th 12UTC, and the positive vorticity advection in front of the trough was beneficial to the decrease of sea level pressure. The cold front accompanied by the cyclone has a nasal structure. Below 800hPa, the pseudo-equivalent potential temperature decreases with the height, and the lower atmosphere is convolution unstable. The vortex equation is used to diagnose and analyze the cyclone. It is found that the convolution term and the stretching term are the main contribution items to the variation of cyclone vorticity. The region around the center of the cyclone 15 (掳) 脳 15 (掳) is designed. It is found that there is a positive feedback process for the circulation along the four sides of the region at different times, the average area non-adiabatic heating in the region, the divergence of water vapor flux and the vertical velocity. That is, there is a positive feedback mechanism similar to CISK in the early stage of cyclone explosive development.
【作者单位】：中国海洋大学海洋与大气学院;
【基金】：国家自然科学基金项目(41275049)资助~~
【分类号】：P732.3

【相似文献】