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contributor authorYoo, Changhyun
contributor authorLee, Sukyoung
contributor authorFeldstein, Steven B.
date accessioned2017-06-09T17:05:23Z
date available2017-06-09T17:05:23Z
date copyright2012/09/01
date issued2012
identifier issn0894-8755
identifier otherams-79212.pdf
identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4221968
description abstractsing lagged composites and projections with the thermodynamic energy equation, in this study the mechanisms that drive the boreal winter Arctic surface air temperature (SAT) change associated with the Madden?Julian oscillation (MJO) are investigated. The Wheeler and Hendon MJO index, which divides the MJO into 8 phases, where phase 1 (phase 5) corresponds to reduced (enhanced) convection over the Maritime Continent and western Pacific Ocean, is used. It is shown that the more zonally localized (uniform) tropical convective heating associated with MJO phase 5 (phase 1) leads to enhanced (reduced) excitation of poleward-propagating Rossby waves, which contribute to Arctic warming (cooling). Adiabatic warming/cooling, eddy heat flux, and the subsequent change in downward infrared radiation (IR) flux are found to be important for the Arctic SAT change. The adiabatic warming/cooling initiates the Arctic SAT change, however, subsequent eddy heat flux makes a greater contribution. The resulting SAT change is further amplified by alteration in downward IR. It is shown that changes in surface sensible and latent heat fluxes oppose the contribution by the above processes.
publisherAmerican Meteorological Society
titleMechanisms of Arctic Surface Air Temperature Change in Response to the Madden–Julian Oscillation
typeJournal Paper
journal volume25
journal issue17
journal titleJournal of Climate
identifier doi10.1175/JCLI-D-11-00566.1
journal fristpage5777
journal lastpage5790
treeJournal of Climate:;2012:;volume( 025 ):;issue: 017
contenttypeFulltext


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