DOI: 10.1007/s00382-012-1584-9
Scopus记录号: 2-s2.0-84884703425
论文题名: How is the Indian Ocean Subtropical Dipole excited?
作者: Morioka Y. ; Tozuka T. ; Yamagata T.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2013
卷: 41, 期: 2017-07-08 起始页码: 1955
结束页码: 1968
语种: 英语
英文关键词: Antarctic Circumpolar Wave
; Antarctic Oscillation
; Indian Ocean Subtropical Dipole
; Mascarene High
英文摘要: Based on experiments using a coupled general circulation model which resolves tropical ocean-atmosphere coupled phenomena such as El Niño/Southern Oscillation (ENSO) and the Indian Ocean Dipole, forcing mechanisms of the Indian Ocean subtropical dipole (IOSD) are investigated. In the control experiment, as in the observation, several types of the IOSD are generated by the variations in the Mascarene High during austral summer and characterized by a dipole pattern of sea surface temperature (SST) anomalies in the northeastern and southwestern parts of the southern Indian Ocean. In another experiment, where the SST outside the southern Indian Ocean is nudged toward the monthly climatology of the simulated SST, one type of the IOSD occurs, but it is less frequent and associated with the zonal wavenumber four pattern of equivalently barotropic geopotential height anomalies in high latitudes, suggesting an interesting link with the Antarctic Circumpolar Wave. This indicates that, even without the atmospheric teleconnection from tropical coupled climate modes, the IOSD may develop in association with the atmospheric variability in high latitudes of the Southern Hemisphere. In the other experiment, where only the southern Indian Ocean and the tropical Pacific are freely interactive with the atmosphere, two types of both positive and negative IOSD occur. Since the occurrence frequency of the IOSD significantly increases as compared to the second experiment, this result confirms that the atmospheric teleconnection from ocean-atmosphere coupled modes in the tropical Pacific such as ENSO may also induce the variations in the Mascarene High that generate the IOSD. The present research, even within the realm of model studies, shows clearly that the predictability of the IOSD in mid-latitudes is related to both low and high-latitudes climate variations. © 2012 Springer-Verlag Berlin Heidelberg. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/54768
Appears in Collections: 过去全球变化的重建
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作者单位: Research Institute for Global Change, JAMSTEC, 3173-25 Showamachi, Kanazawa-ku, Yokohama, Kanagawa, 236-0001, Japan; Department of Earth and Planetary Science, Graduate School of Science, The University of Tokyo, Tokyo, Japan; Application Laboratory, JAMSTEC, Yokohama, Japan
Recommended Citation:
Morioka Y.,Tozuka T.,Yamagata T.. How is the Indian Ocean Subtropical Dipole excited?[J]. Climate Dynamics,2013-01-01,41(2017-07-08)