摘要
文中重点研究与热带季节内振荡－超级云团系统相关联的赤道波的识别。考虑到赤道波的本质为截获在赤道地区的一般的气候平衡场附近的线性动力过程的固有模态，首先从原理上阐明了ＰＯＰｓ分析技术对于分离各类赤道波动的有效性，以后利用这种分析方法对日本静止气象卫星所观测到的黑体红外辐射温度资料进行了ＰＯＰｓ分析。结果表明，在热带季节内振荡－超级云团系统中，对应于４０ｄ振荡的模态基本表现为Ｋｅｌｖｉｎ波的结构；对应于１０ｄ左右的模态，亦为Ｋｅｌｖｉｎ波，而在２ｄ尺度上，则分别存在经向模态序号ｎ＝１和ｎ＝２的西进和东进惯性重力波。分析中还发现了西进的混合Ｒｏｓｓｂｙ重力波的存在。
This paper is focused on the detection of equatorial waves related to the intraseasonal oscillation /super cloud cluster system. Since tropical waves can be generally defined as the tropically trapped eigenmodes of the linear dynamics of the tropical atmosphere,POP technique is regarded an effective method to separate all kinds of equatorial waves from observed data. Data of infrared equivalent black body temperature by Japanese Geostationary Meteorological Satellite are subjected to a POP analysis. The results suggest that within a ISO/SCC system, eigenmodes with a period of about 40 and 10 days mainly exhibit Kelvin wave like features, while those with periods of 2.1 and 1.8 days correspond to the westward propagating inertio gravity wave with meridional mode number n=1 and eastward propagating inertio gravity wave with n=2 , respectively. An eigenmode which behaves like mixed Rossby gravity wave is also found in the analysis.
出处
《气象学报》
CSCD
北大核心
1999年第1期84-95,共12页
Acta Meteorologica Sinica
关键词
季节内振荡
超级云团
赤道波
大气动力学
Intraseasonal oscillation, Super cloud clusters, Equatorial waves, POPs technique.
