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contributor authorOsprey, Scott M.
contributor authorGray, Lesley J.
contributor authorHardiman, Steven C.
contributor authorButchart, Neal
contributor authorBushell, Andrew C.
contributor authorHinton, Tim J.
date accessioned2017-06-09T16:34:16Z
date available2017-06-09T16:34:16Z
date copyright2010/11/01
date issued2010
identifier issn0022-4928
identifier otherams-70184.pdf
identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4211937
description abstractStratospheric variability is examined in a vertically extended version of the Met Office global climate model. Equatorial variability includes the simulation of an internally generated quasi-biennial oscillation (QBO) and semiannual oscillation (SAO). Polar variability includes an examination of the frequency of sudden stratospheric warmings (SSW) and annular mode variability. Results from two different horizontal resolutions are also compared. Changes in gravity wave filtering at the higher resolution result in a slightly longer QBO that extends deeper into the lower stratosphere. At the higher resolution there is also a reduction in the occurrence rate of sudden stratospheric warmings, in better agreement with observations. This is linked with reduced levels of resolved waves entering the high-latitude stratosphere. Covariability of the tropical and extratropical stratosphere is seen, linking the phase of the QBO with disturbed NH winters, although this linkage is sporadic, in agreement with observations. Finally, tropospheric persistence time scales and seasonal variability for the northern and southern annular modes are significantly improved at the higher resolution, consistent with findings from other studies.
publisherAmerican Meteorological Society
titleThe Climatology of the Middle Atmosphere in a Vertically Extended Version of the Met Office’s Climate Model. Part II: Variability
typeJournal Paper
journal volume67
journal issue11
journal titleJournal of the Atmospheric Sciences
identifier doi10.1175/2010JAS3338.1
journal fristpage3637
journal lastpage3651
treeJournal of the Atmospheric Sciences:;2010:;Volume( 067 ):;issue: 011
contenttypeFulltext


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