文章基本信息

标题：Association of Indian Ocean ITCZ Variations with the Arctic Oscillation during Boreal Winter
本地全文：下载
作者：Gong Dao-Yi ; Gao Yong-Qi ; Hu Miao 等
期刊名称：Atmospheric and Oceanic Science Letters
印刷版ISSN：1674-2834
电子版ISSN：2376-6123
出版年度：2013
卷号：6
期号：5
页码：300-305
DOI：10.3878/j.issn.1674-2834.12.0108
语种：English
出版社：Taylor and Francis Ltd
摘要：In this study, the authors analyzed the associations between the Arctic Oscillation (AO) and the tropical Indian Ocean (TIO) intertropical convergence zone (ITCZ) in boreal winter for the period 1979-2009. A statistically significant AO-TIO ITCZ linkage was found. The ITCZ vertical air motion is significantly associated with the AO, with upward (downward) air motion corresponding to the positive (negative) AO phase. The Arabian Sea anticyclone plays a crucial role in linking the AO and the TIO ITCZ. The Arabian Sea vorticity is strongly linked to high-latitude disturbances in conjunction with jet stream waveguide effects of disturbance trapping and energy dispersion. During positive (negative) AO years, the Arabian Sea anticyclone tends to be stronger (weaker). The mean vorticity over the Arabian Sea, averaged from 850 hPa to 200 hPa, has a significant negative correlation with AO (r = .0.63). The anomalous anticyclone over the Arabian Sea brings stronger northeastern winds, which enhance the ITCZ after crossing the equator and result in greater-than-normal precipitation and minimum outgoing long-wave radiation.
关键词：Arctic Oscillation; tropical Indian Ocean; ITCZ; teleconnection