【作者】 宋超辉； 郭品文； 苗芮；

【Author】 Song Chaohui,Guo Pinwen,Miao Rui ( Nanjing University of Information Science and Technology, Nanjing, 210044)

【机构】 南京信息工程大学；

【摘要】 亚洲热带夏季风子系统包括南亚夏季风和南海夏季风两个子系统,而与这两个子系统相对应的最主要的季风槽是孟加拉湾夏季风槽和南海夏季风槽,也是亚洲热带夏季风系统的重要组成部分。南亚夏季风区和南海夏季风区有其各自的影响范围,称之为南亚夏季风和南海夏季风的控制域。采用以两个季风槽为中心的正涡度区的边界作为南亚夏季风和南海夏季风控制域的边界,此边界以西为南亚夏季风控制域,以东为南海夏季风控制域。定义每年的JJA平均涡度纬向最小值点连线为每年的夏季风子系统内边界,且南亚夏季风和南海夏季风的控制域边界的变动具有一定的年际变化和年代际变化特征。研究亚洲热带夏季风子系统控制域变动与ENSO的关联,结果表明,强LaNia年南亚夏季风和南海夏季风控制域边界偏东的可能性较大,而ElNio年南亚夏季风和南海夏季风控制域边界偏西的可能性较大。且当控制域边界偏东,同时也是强LaNia年的时候,对应南亚高压东部型,南亚夏季风区环流系统强度偏强;而当控制域边界偏西,同时也是强ElNio年时对应南亚高压西部型,南亚夏季风区环流系统强度偏弱。此外,南亚夏季风和南海夏季风控制域变动与ENSO对应不同年份的热力结构也有明显差异。更多还原

【Abstract】 The Subsystems of Asian Tropical Summer Monsoon contain the South Asian summer monsoon and the South China Sea summer monsoon, and corresponds to these two subsystems are the South Asian summer monsoon trough and the South China Sea summer monsoon trough, which are important components of the Asian Tropical Summer Monsoon system. The controled field of the South Asian summer monsoon and the South China Sea summer monsoon means their influnenced region. Adopting boundary of the two positive vorticity areas, whose centre is the two monsoon trough. And the west of the boundary is the South Asian summer monsoon’s controled field, while the east of the boundary is the South China Sea summer monsoon’s. The boundary is defined by a line consist of points whose vorticity are the minimum value everyyear in JJA at different latitude. Meanwhile, the boundary has its internnual and interdecal variability. The research of The Relevancy Between the Controled Field of the Subsystems of Asian Tropical Summer Monsoon and the ENSO suggests, the boundary was likely located by east when happened strong La Ni a, while the boundary was likely located by west when happened strong El Ni o. Moreover, when the boundary was by east and strong La Ni a happened at the same time, the South Asia High was east type, and circulation was stronger, while when the boundary was by west and strong El Ni o happened at the same time, the South Asia High was west type, and circulation was weaker. In addition, there are obvious differences on the thermodynamic structure in different years responsed to variation of the boundary and the ENSO.更多还原