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Regional meridional cells governing the interannual variability of the Hadley circulation in boreal winter

Sun, Yong; Li, Laurent Z. X.; Ramstein, Gilles; Zhou, Tianjun; Tan, Ning; Kageyama, Masa; Wang, Shaoyin

Abstract:
The Hadley circulation (HC) has conventionally been considered as thermally direct with uniform zonal distribution. However, the meridional circulation in the tropics is far from uniform, including the thermally direct cells associated with the global monsoon heating and indirect cells in the absence of diabatic heating. This study aims at assessing the thermally direct and indirect cells in different regions, identifying the geographic sectors responsible for interannual variability of HC strength and boundaries, and unraveling the underlying mechanism for the interannual variability of HC edges and intensity. Results derived from ERA-Interim reanalysis and climate models show that the climatological HC in wintertime (December–January–February) obscures longitudinal diversity of regional meridional cells (RMC), including thermally direct RMCs over Eurasia and the Eastern Pacific, thermally direct southern limbs of RMCs over the Central Pacific and Western Atlantic with opposite circulation. For each of the regions, El Niño-South Oscillation and mid-latitude eddies are assessed in terms of their relative contributions to the interannual variability of HC intensity and extent. ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000104563
Veröffentlicht am 07.01.2020
Originalveröffentlichung
DOI: 10.1007/s00382-018-4263-7
Scopus
Zitationen: 1
Web of Science
Zitationen: 1
Coverbild
Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung - Atmosphärische Spurenstoffe und Fernerkundung (IMK-ASF)
Publikationstyp Zeitschriftenaufsatz
Jahr 2019
Sprache Englisch
Identifikator ISSN: 0930-7575, 1432-0894
KITopen-ID: 1000104563
Erschienen in Climate dynamics
Band 52
Heft 1-2
Seiten 831–853
Vorab online veröffentlicht am 28.05.2018
Schlagworte Hadley circulation, Global monsoon, Strength, Extent, Interannual variability, ENSO, Mid-latitude eddies, Jet, Reanalysis, CMIP5 model
Nachgewiesen in Web of Science
Scopus
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