Open AccessThe missing teleconnection between the North Atlantic and the Sahel precipitation in CFSv2
Author(s) -
Barandiaran Daniel,
Wang ShihYu
Publication year - 2013
Publication title -
atmospheric science letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.951
H-Index - 45
ISSN - 1530-261X
DOI - 10.1002/asl2.457
Subject(s) - teleconnection , climatology , rossby wave , precipitation , tropical atlantic , atlantic multidecadal oscillation , environmental science , geology , geography , el niño southern oscillation , north atlantic oscillation , meteorology , sea surface temperature
This study presents new findings on the link between interannual variabilities of atmospheric circulations over the North Atlantic and precipitation over the African Sahel ( P S ). Our analysis shows a meridionally stratified circulation wave train resembling the East Atlantic ( EA ) mode, apparently connected to P S through Rossby wave dispersion in the middle troposphere originating from the North Atlantic. However, the Climate Forecast System version 2 fails to depict the EA and its P S impact. Because the EA explains 29% of variance of P S , this portion of P S variability is either missing in the seasonal forecast, or being made up by an alternative process .