| 季风槽中热带气旋生成初期扰动的扰动动能收支分析 |
| |
| 引用本文： | 段晶晶,吴立广.季风槽中热带气旋生成初期扰动的扰动动能收支分析[J].气象科学,2016,36(2):141-148. |
| |
| 作者姓名： | 段晶晶 吴立广 |
| |
| 作者单位： | 南京信息工程大学 气象灾害省部共建教育部重点实验室, 南京 210044;宁波市气象台, 浙江 宁波 315012,南京信息工程大学 气象灾害省部共建教育部重点实验室, 南京 210044 |
| |
| 基金项目： | 国家自然科学基金资助项目(41275093);江苏省特聘教授项目 |
| |
| 摘 要： | 热带气旋总是发生在天气尺度扰动中,本文利用NCEP/NCAR提供的FNL资料,选取了2004年8月11日—9月10日期间季风槽中5个热带气旋生成初期扰动,通过计算动能收支分析这些初期扰动的发展。其中4个热带气旋都是生成在向西北方向传播的天气尺度波列的气旋性环流中,气旋性环流可以和呈东北—西南方向倾斜西传的MRG波的逆时针环流耦合。动能收支计算表明,初期扰动动能在热带气旋生成前12~72 h不断增加,扰动位势通量的辐合对扰动动能增长起了主要作用。在季风槽东端的合流区时,能量聚集项有重要作用,随着扰动移入季风槽内,低频纬向风切变项成为能量增加的一个重要来源。Sarika生成于季风槽西撤阶段,非线性作用项对扰动发展起了关键作用。
|
| 关 键 词： | 热带气旋生成的初期扰动 MRG波 天气尺度波列 能量分析 |
| 收稿时间： | 2014/12/10 0:00:00 |
| 修稿时间： | 2/8/2015 12:00:00 AM |
Kinetic Energy Budegt Analysis of Tropical Cyclogenesis Precursors in the Monsoon Trough |
| |
| DUAN Jingjing and WU Liguang.Kinetic Energy Budegt Analysis of Tropical Cyclogenesis Precursors in the Monsoon Trough[J].Scientia Meteorologica Sinica,2016,36(2):141-148. |
| |
| Authors: | DUAN Jingjing and WU Liguang |
| |
| Institution: | Key Laboratory of Meteorological Disaster of Ministry of Education, Nanjing University of Information Science & Technology, Nanjing 210044, China;Ningbo Meteorologial Observatory, Ningbo 315012, China and Key Laboratory of Meteorological Disaster of Ministry of Education, Nanjing University of Information Science & Technology, Nanjing 210044, China |
| |
| Abstract: | Tropical cyclones always occur in a synoptic-scale disturbance. By using NCEP/NCAR FNL data, tropical cyclogenesis precursors in the monsoon trough from 11 August to 10 September 2004 were chosen. Through calculating the kinetic energy budget, we analyzed the development of the tropical cyclogenesis precursors. Aside from Chaba, others all formed in the cyclonic circulation of the northwestward-propagating synoptic-scale wave trains. The cyclonic circulation can couple with the northeast-southwest-titled anticlockwise circulation of the westward-propagating MRG wave. Kinetic energy budegt analysis reveals that kinetic energy of tropical cyclogenesis precursors increased before 12-72 hours prior to the formation of the tropical depression. Local convergence of the eddy geopotential flux was the dominant term. When the precursor first appeared at the far eastern end of the monsoon trough, energy accumulation was also a main factor for disturbance development. As the disturbance moved northwestward and entered the monsoon shear region, barotropic energy conversion by the meridional gradient of the basic zonal flow was indeed another important energy source. For the case of Sarika, it formed when the MT westward retreated. The nolinear term played another important role for this disturbance development. |
| |
| Keywords: | Tropical cyclogenesis precursors MRG wave Synoptic-scale wave trains Energetics analyses |
| 本文献已被 CNKI 等数据库收录！ |
| 点击此处可从《气象科学》浏览原始摘要信息 |
| 点击此处可从《气象科学》下载免费的PDF全文 |
|
