Show simple item record

contributor authorLiu, Ting
contributor authorLi, Jianping
contributor authorZheng, Fei
date accessioned2017-06-09T17:11:31Z
date available2017-06-09T17:11:31Z
date copyright2015/11/01
date issued2015
identifier issn0894-8755
identifier otherams-80857.pdf
identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4223795
description abstracts an atmospheric oscillation with a global scale, the Southern Hemisphere (SH) annular mode (SAM) contributes not only to SH climate variability but also to climate anomalies in the Northern Hemisphere (NH). This paper demonstrates that the strong (weak) boreal autumn SAM usually favors a positive (negative) tripole precipitation pattern in the NH, with more (less) precipitation over the equator and midlatitudes but less (more) precipitation in the subtropics. The corresponding mechanism is examined based on reanalysis data and numerical modeling. It is suggested that the boreal autumn SAM is associated with changes in surface subpolar westerlies, which influence the surface heat exchange and drive the meridional oceanic Ekman flow, redistributing heat near the surface. Through these, warmer (colder) and colder (warmer) sea surface temperature (SST) belts in the SH middle and high latitudes form in response to the positive (negative) boreal autumn SAM, respectively. Such a positive (negative) Southern Ocean SST dipole pattern can persist into the boreal winter via the ?memory? of SST. It can then affect the vertical motion in the SH meridional circulation and strengthen (weaken) the NH upward and downward branches. These anomalous vertical flows favor a positive (negative) tripole precipitation anomaly pattern in the NH under suitable moisture conditions. Such an ?ocean?atmosphere coupled bridge? allows the influence of the boreal autumn SAM to persist into the following season and affect the NH climate. Hence, this work suggests that the boreal autumn SAM provides a significant forecasting signal for the NH climate in the following winter.
publisherAmerican Meteorological Society
titleInfluence of the Boreal Autumn Southern Annular Mode on Winter Precipitation over Land in the Northern Hemisphere
typeJournal Paper
journal volume28
journal issue22
journal titleJournal of Climate
identifier doi10.1175/JCLI-D-14-00704.1
journal fristpage8825
journal lastpage8839
treeJournal of Climate:;2015:;volume( 028 ):;issue: 022
contenttypeFulltext


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record