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contributor authorSimpson, Isla R.
contributor authorBlackburn, Michael
contributor authorHaigh, Joanna D.
contributor authorSparrow, Sarah N.
date accessioned2017-06-09T16:36:02Z
date available2017-06-09T16:36:02Z
date copyright2010/12/01
date issued2010
identifier issn0894-8755
identifier otherams-70712.pdf
identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4212524
description abstractPrevious studies have made use of simplified general circulation models (sGCMs) to investigate the atmospheric response to various forcings. In particular, several studies have investigated the tropospheric response to changes in stratospheric temperature. This is potentially relevant for many climate forcings. Here the impact of changing the tropospheric climatology on the modeled response to perturbations in stratospheric temperature is investigated by the introduction of topography into the model and altering the tropospheric jet structure. The results highlight the need for very long integrations so as to determine accurately the magnitude of response. It is found that introducing topography into the model and thus removing the zonally symmetric nature of the model?s boundary conditions reduces the magnitude of response to stratospheric heating. However, this reduction is of comparable size to the variability in the magnitude of response between different ensemble members of the same 5000-day experiment. Investigations into the impact of varying tropospheric jet structure reveal a trend with lower-latitude/narrower jets having a much larger magnitude response to stratospheric heating than higher-latitude/wider jets. The jet structures that respond more strongly to stratospheric heating also exhibit longer time scale variability in their control run simulations, consistent with the idea that a feedback between the eddies and the mean flow is both responsible for the persistence of the control run variability and important in producing the tropospheric response to stratospheric temperature perturbations.
publisherAmerican Meteorological Society
titleThe Impact of the State of the Troposphere on the Response to Stratospheric Heating in a Simplified GCM
typeJournal Paper
journal volume23
journal issue23
journal titleJournal of Climate
identifier doi10.1175/2010JCLI3792.1
journal fristpage6166
journal lastpage6185
treeJournal of Climate:;2010:;volume( 023 ):;issue: 023
contenttypeFulltext


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