南海-西北太平洋季风槽中热带气旋群发的研究 Ⅰ.热带气旋群发的基本特征

高建芸; 吕心艳; 鲍瑞娟; 张秀芝

南海-西北太平洋季风槽中热带气旋群发的研究 Ⅰ.热带气旋群发的基本特征

1.
福建省气候中心,福建福州 350001
2.
中国气象科学研究院,北京 100081
3.
国家气候中心,北京 100081

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出版历程
- 收稿日期: 2009-06-27
- 修回日期: 2010-05-17

Research on the cluster of tropical cyclogenesis in the South China Sea-western North Pacific monsoon trough Ⅰ. Major features about the cluster of tropical cyclogenesis

1.
Fujian Climate Center, Fuzhou 350001,China
2.
Chinese Academy of Meteorological Sciences,Beijing 100081,China
3.
National Climate Center,Beijing 100081,China

摘要

摘要: 应用1979-2005年西北太平洋热带气旋(TC)资料和NCEP/DOE AMIP-Ⅱ逐日再分析资料,在逐年分析南海-西北太平洋季风槽中TC(简称MTTC)生成及其群发的基础上,揭示季风槽中MTTC群发的基本特征,得到几点结论:(1)年平均MTTC群发过程3~4次,8月是MTTC群发最多的月份,占30%,9月次之,而5月份最少,仅占4％;(2)MTTC群发异常偏少年MTTC生成海区范围较常年偏小,位置较正常年份偏南、偏西;而异常偏多年MTTC生成海区范围较大,位置较常年偏北、偏东;(3)MTTC群发主要形成于4种季风槽环流模态中,即季风槽东伸型、反向季风槽型、三气流型、西太平洋季风槽型,其中,季风槽东伸型是MTTC群发的主要环流模态,占60.0%,西太平洋季风槽出现MTTC群发最少,仅占4.8%;(4)季风槽强度和形态的异常可能造成MTTC群发异常,而MTTC群发异常致使MTTC年频数异常。
- 南海-西北太平洋季风槽 /
- 热带气旋 /
- 群发
Abstract: By using the western North Pacific tropical cyclone(TC)data and the NCEP/DOE AMIP-Ⅱ reanalysis daily data during 1979-2005, the features of TCs in the South China Sea(SCS)-western North Pacific monsoon trough (MTTC) and the cluster of tropical cyclogensis (CTC) are analysed. The main results are shown as follows: (1)The average frequency of the CTC is 3~4 times per year. In August, the number of the CTC is maximum, occupying 30%, followed by September, and it is minimum in May, only accounting for 4%. (2) The MTTCs genesis area is smaller (bigger), located more south-(north-) and west-(eastward) than normal in inactive (active) years.(3)CTC mainly formed in four monsoon trough (MT) patterns: eastward extend MT, reverse-oriented MT, the three streams MT and western Pacific MT, of which the first pattern is the chief, in which 60.0% of MTTC form, the last one is the least, only accounting for 4.8%. (4) Anomalies in the intensity and pattern of monsoon trough lead to the abnormal CTCs which result in the abnormal frequency of MTTCs.
- the SCS-western North Pacific monsoon trough /
- the tropical cyclogenesis /
- cluster

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参考文献(5)

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CHANG C-P, CHEN J M, HARR P A, et al. Northwestward-propagating wave patterns over the tropical western North Pacific during summer[J]. Mon Wea Rev, 1996,124(10): 2245-2266.

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