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Volume 34 Issue 2
Mar.  2015
Article Contents

Citation:

Differences between the Northwest Pacific tropical cyclone genesis location of two kinds of El Nio Modoki in autumn

  • Received Date: 2014-01-22
    Accepted Date: 2014-03-06
  • Based on that whether there is a positive IOD event in the same year, the El Nio Modoki events are divided into two kinds: p-ENM and ENM-IOD. Two typical p-ENM events (2004;2009) and two typical ENM-IOD events (1991;1994) are selected. The results of comparative analysis show that the same events have similar tropical cyclone genesis patterns while tropical cyclone genesis of the Northwest Pacific in ENM-IOD autumn shifts eastward compared with that in p-ENM autumn. The two p-ENM events have weak and narrow westerly wind anomaly area which is observed in the west of 165E, however the two ENM-IOD events have much stronger equatorial westerly wind anomaly that extends across the dateline. So the ENM-IOD autumn monsoon trough prolongs about 20 farther east than the p-ENM monsoon trough. At the same time, autumn vertical wind shear in the Northwest Pacific is weaker and narrower in p-ENM than in ENM-IOD. The differences in position of monsoon trough and vertical wind shear distribution make the tropical cyclone genesis location farther east in ENM-IOD autumn than in p-ENM autumn.
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  • [1] 陈光华, 黄荣辉.西北太平洋热带气旋和台风活动若干气候问题的研究[J].地球科学进展, 2006, 21(6):610-616.[2]杨亚新.西北太平洋热带气旋发生的时空变化特征[J].海洋预报, 2005, 22(1):86-91.[17]袁慧珍.印度洋偶极子及其与中国降水关系[D].南京:南京信息工程大学, 2006.
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    沈阳化工大学材料科学与工程学院 沈阳 110142

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Differences between the Northwest Pacific tropical cyclone genesis location of two kinds of El Nio Modoki in autumn

  • 1. College of Physical and Environmental Oceanography, Ocean University of China, Qingdao 266100, China;
  • 2. The Chinese People's Liberation Army 91960, Shantou 515000, China

Abstract: Based on that whether there is a positive IOD event in the same year, the El Nio Modoki events are divided into two kinds: p-ENM and ENM-IOD. Two typical p-ENM events (2004;2009) and two typical ENM-IOD events (1991;1994) are selected. The results of comparative analysis show that the same events have similar tropical cyclone genesis patterns while tropical cyclone genesis of the Northwest Pacific in ENM-IOD autumn shifts eastward compared with that in p-ENM autumn. The two p-ENM events have weak and narrow westerly wind anomaly area which is observed in the west of 165E, however the two ENM-IOD events have much stronger equatorial westerly wind anomaly that extends across the dateline. So the ENM-IOD autumn monsoon trough prolongs about 20 farther east than the p-ENM monsoon trough. At the same time, autumn vertical wind shear in the Northwest Pacific is weaker and narrower in p-ENM than in ENM-IOD. The differences in position of monsoon trough and vertical wind shear distribution make the tropical cyclone genesis location farther east in ENM-IOD autumn than in p-ENM autumn.

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