Open AccessInterdecadal circumglobal teleconnection pattern during boreal summer
Author(s) -
Wu Bo,
Lin Jianshe,
Zhou Tianjun
Publication year - 2016
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/asl.677
Subject(s) - teleconnection , climatology , northern hemisphere , geopotential height , baroclinity , extratropical cyclone , barotropic fluid , geology , boreal , rossby wave , southern hemisphere , common spatial pattern , atmospheric circulation , precipitation , atmospheric sciences , el niño southern oscillation , geography , meteorology , paleontology , statistics , mathematics
A new atmospheric teleconnection pattern on the interdecadal time scale, interdecadal circumglobal teleconnection pattern ( ID‐CGT pattern), is identified. The ID‐CGT pattern dominates the interdecadal variability of the Northern Hemisphere ( NH ) extratropical circulation during boreal summer. The ID‐CGT pattern has a great climate effect and can cause an alternatively positive and negative pattern of the NH mid‐latitude land surface temperature anomalies. Compared with its counterpart on the interannual time scale ( IA‐CGT pattern), the ID‐CGT pattern shows following three distinctive features. Firstly, although both ID‐CGT and IA‐CGT patterns show zonal wavenumber‐5 structures, the former nodes shift westward relative to the latter by about 1/4 wavelength. Secondly, all the five nodes of the ID‐CGT pattern possess barotropic structures, unlike the IA‐CGT , which has a baroclinic node. Thirdly, the ID‐CGT pattern is associated with the Atlantic multi‐decadal oscillation, whereas the IA‐CGT pattern is with the Indian summer monsoon precipitation anomalies.