Open AccessThe prominence of a tropical convective signal in the wintertime Arctic temperature
Author(s) -
Yoo Changhyun,
Feldstein Steven B.,
Lee Sukyoung
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/asl2.455
Subject(s) - madden–julian oscillation , climatology , extratropical cyclone , environmental science , the arctic , convection , arctic , atmospheric sciences , albedo (alchemy) , sea surface temperature , geology , meteorology , physics , oceanography , performance art , art history , art
Power spectral analysis reveals that the Arctic temperature averaged over 60°N–90°N oscillates on intraseasonal time scales, centered at about 40 days. We present evidence that this intraseasonal peak is strongly tied to the Madden–Julian Oscillation ( MJO ), the dominant mode of tropical intraseasonal variability. Although an MJO /extratropical surface air temperature relationship has been found in previous studies, our results indicate that this relationship is more prevalent than previously recognized and is strongest at the Arctic surface. This bottom‐heavy temperature structure suggests that Arctic surface warming can arise from remote processes, and not necessarily from surface albedo feedback as previously argued.