contributor author | Dezfuli, Amin K. | |
contributor author | Zaitchik, Benjamin F. | |
contributor author | Gnanadesikan, Anand | |
date accessioned | 2017-06-09T17:10:37Z | |
date available | 2017-06-09T17:10:37Z | |
date copyright | 2015/01/01 | |
date issued | 2014 | |
identifier issn | 0894-8755 | |
identifier other | ams-80608.pdf | |
identifier uri | http://onlinelibrary.yabesh.ir/handle/yetl/4223519 | |
description abstract | his study examines daily precipitation data during December?March over south equatorial Africa (SEA) and proposes a new zonal asymmetric pattern (ZAP) that explains the leading mode of weather-scale precipitation variability in the region. The eastern and western components of the ZAP, separated at about 30°E, appear to be a consequence of an anomalous zonal atmospheric cell triggered by enhanced low-level westerly winds. The enhanced westerlies are generated by a diagonal interhemispheric pressure gradient between the southwestern Indian and north tropical Atlantic Oceans. In eastern SEA these winds hit the East African Plateau, producing low-level convergence and convection that further intensifies the westerlies. In western SEA a subsiding branch develops in response, closing the circulation cell. The system gradually dissipates as the pressure gradient weakens. Through this mechanism, simultaneous changes in two hemispheres generate a regional zonally oriented circulation that relies on climatic communication between eastern and western equatorial Africa. | |
publisher | American Meteorological Society | |
title | Regional Atmospheric Circulation and Rainfall Variability in South Equatorial Africa | |
type | Journal Paper | |
journal volume | 28 | |
journal issue | 2 | |
journal title | Journal of Climate | |
identifier doi | 10.1175/JCLI-D-14-00333.1 | |
journal fristpage | 809 | |
journal lastpage | 818 | |
tree | Journal of Climate:;2014:;volume( 028 ):;issue: 002 | |
contenttype | Fulltext | |