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Is there a linkage between the tropical cyclone activity in the southern Indian Ocean and the Antarctic Oscillation?

Cited 4 time in scopus
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Title
Is there a linkage between the tropical cyclone activity in the southern Indian Ocean and the Antarctic Oscillation?
Other Titles
남인도양의 사이클론과 남극진동의 관계가 있는가?
Authors
Rui Mao
Hao-Zhe He
Kim, Seong-Joong
Zi-Yin Zhang
Jing Yang
Dao-Yi Gong
Subject
Meteorology & Atmospheric Sciences
Keywords
Antarcitc-tropics linkage; Antarctic Oscillation; Indian Ocean; teleonnection; tropical cyclone
Issue Date
2013
Publisher
American
Citation
Rui Mao, et al. 2013. "Is there a linkage between the tropical cyclone activity in the southern Indian Ocean and the Antarctic Oscillation?". JOURNAL OF GEOPHYSICAL RESEARCH, 118(15): 8519-8535.
Abstract
In this article, the relationship between the Antarctic Oscillation (AAO) and the tropical cyclone (TC) activity in the Southern Indian Ocean (SIO) was examined. It was found that, on the interannual time scale, the AAO is well linked with the TC activity in the SIO during TC season (December to March). The rank correlation coefficient between the AAO index and the TC frequency in the SIO is 0.37, which is significant at the 95% confidence level. When the AAO is in a positive phase, TC passage in the northwestern coast of Australia (100E°-120°E and 10°S-30°S) increases by approximately 50-100% from the climatology. The increase in the TC passage is primarily the result of more frequent TCs originating in this region due to an enhanced water vapor convergence and ascending motions, which are caused by a cyclonic height anomaly over the western coast of Australia associated with the positive AAO phases. In addition, the AAO-height co-variations, which are essential to the formation of the AAO-TC links in the SIO, were investigated through a historical climate simulation using the Community Climate System Model 4 from the Coupled Model Intercomparison Project Phase 5. The AAO-height links were well reproduced in the simulation. The similarity in the AAO-height links between the observation and the simulation supports the physical robustness of the AAO-TC links in the SIO.the TC activity in the SIO during TC season (December to March). The rank correlation coefficient between the AAO index and the TC frequency in the SIO is 0.37, which is significant at the 95% confidence level. When the AAO is in a positive phase, TC passage in the northwestern coast of Australia (100E°-120°E and 10°S-30°S) increases by approximately 50-100% from the climatology. The increase in the TC passage is primarily the result of more frequent TCs originating in this region due to an enhanced water vapor convergence and ascending motions, which are caused by a cyclonic height anomaly over the western coast of Australia associated with the positive AAO phases. In addition, the AAO-height co-variations, which are essential to the formation of the AAO-TC links in the SIO, were investigated through a historical climate simulation using the Community Climate System Model 4 from the Coupled Model Intercomparison Project Phase 5. The AAO-height links were well reproduced in the simulation. The similarity in the AAO-height links between the observation and the simulation supports the physical robustness of the AAO-TC links in the SIO.
URI
http://repository.kopri.re.kr/handle/201206/6116
DOI
http://dx.doi.org/10.1002/jgrd.50666
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