Association of Indian Ocean ITCZ Variations with the Arctic Oscillation during Boreal Winter

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 signif...

Full description

Saved in:
Bibliographic Details
Published in:Atmospheric and oceanic science letters = Daqi-he-haiyang-kexue-kuaibao 2013, Vol.6 (5), p.300-305
Main Author: GONG Dao-Yi GAO Yong-Qi HU Miao GUO Dong
Format: Article
Language:English
Subjects:
冬季
北半球
北极涛动
协会
热带印度洋
热带辐合带
赤道辐合带
阿拉伯海
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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.
ISSN:1674-2834
2376-6123
DOI:10.1080/16742834.2013.11447098