How Do the Monsoon Trough and the Tropical Upper-Tropospheric Trough Affect Synoptic-Scale Waves: A Comparative Study
How Do the Monsoon Trough and the Tropical Upper-Tropospheric Trough Affect Synoptic-Scale Waves: A Comparative Study
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季风槽和热带对流层上层槽如何影响天气尺度波：一项比较研究
DOI：
10.2151/jmsj.2020-037
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发表时间：
2020-04
影响因子：
3.1
通讯作者：
Yang Dejian
中科院分区：
文献类型：
--
作者：
Feng Tao;Yang Xiu-Qun;Wu Liang;Huang Ronghui;Yang Dejian
利用气候预报系统再分析、联合台风警报中心最佳路径和热带测雨使命任务降水资料，选取2004年和2006年两个持续时间较长的天气尺度波列，研究了控制热带西北太平洋西传天气尺度扰动结构的大气因子。这两种波列的本质区别在于它们的垂直结构。在2004年，最大扰动发生在对流层中下部，具有相当的正压结构;然而，在2006年，它们主要发生在对流层上部，具有显著的高度倾斜。季风槽、热带对流层上层槽（TUTT）和相关的垂直风切变的不同配置造成了这种结构差异。2004年，TUTT向东移动，形成了一个东风切变环境，将天气尺度波限制在对流层低层。季风槽通过正压能量转换，增强了对流层低层的波动活动。与此相反，而TUTT向西移在2006年，天气尺度波盛行于对流层上层的环境西风切变。同时，扰动在对流层上层发展，通过TUTT动能的转换，表现出头重脚轻的垂直结构。季风槽和TUTT的相干运动对天气尺度波的垂直结构和发展起着调制作用。通讯作者：梁武，中国科学院大气物理研究所季风系统研究中心，P.O.中国北京市朝阳区2718信箱100190 E-mail：wul@mail.iap.ac.cn J-stage Advance Published Date：9 April 2020 Journal of the Meteorological Society of Japan Vol. 98，No. 4 736
Using the Climate Forecast System Reanalysis, Joint Typhoon Warning Center best track, and Tropical Rainfall Measuring Mission precipitation data, two long-lasting synoptic-scale wave trains in 2004 and 2006 are selected to investigate the atmospheric factors controlling the structures of westward-propagating synoptic-scale disturbances over the tropical western North Pacific. The essential difference between these two wave trains is found in their vertical structures. In 2004, the maximum perturbations occurred from the middle to lower troposphere with an equivalent barotropic structure; however, in 2006, they primarily occurred in the upper troposphere with a prominent tilt regarding height. Distinct configurations of the monsoon troughs, the tropical upper-tropospheric troughs (TUTT), and associated vertical wind shear caused such structural differences. In 2004, the TUTT shifted eastward, creating an easterly sheared environment to confine synoptic-scale waves in the lower troposphere. Then, the monsoon trough enhanced the wave activity through barotropic energy conversion in the lower troposphere. In contrast, while the TUTT shifted westward in 2006, synoptic-scale waves prevailed in the upper troposphere by the environmental westerly shear. Meanwhile, the disturbances developed in the upper troposphere through to the conversion of kinetic energy from the TUTT, exhibiting a top-heavy vertical structure. The coherent movement of the monsoon trough and the TUTT modulate the vertical structure and the development of the synopticscale waves. Corresponding author: Liang Wu, Center for Monsoon System Research, Institute of Atmospheric Physics, Chinese Academy of Sciences, P. O. BOX 2718, Beijing 100190, China E-mail: wul@mail.iap.ac.cn J-stage Advance Published Date: 9 April 2020 Journal of the Meteorological Society of Japan Vol. 98, No. 4 736
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影响因子：
3.2
作者：
Tsing‐Chang Chen;S. Wang;M. Yen;A. Clark
通讯作者：
Tsing‐Chang Chen;S. Wang;M. Yen;A. Clark
影响因子：
2.9
作者：
B. Fu;Tim Li;M. Peng;F. Weng
通讯作者：
B. Fu;Tim Li;M. Peng;F. Weng
影响因子：
3.1
作者：
G. Katul;J. Albertson;C. Hsieh;P. Conklin;J. Sigmon;M. Parlange;K. Knoerr
通讯作者：
G. Katul;J. Albertson;C. Hsieh;P. Conklin;J. Sigmon;M. Parlange;K. Knoerr
影响因子：
3.1
作者：
K. Trenberth;Shyh-C. Chen
通讯作者：
K. Trenberth;Shyh-C. Chen
影响因子：
3.2
作者：
R. A. Madden;Jill Williams
通讯作者：
R. A. Madden;Jill Williams