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contributor authorChou, Chia
contributor authorNeelin, J. David
contributor authorTu, Jien-Yi
contributor authorChen, Cheng-Ta
date accessioned2017-06-09T17:02:14Z
date available2017-06-09T17:02:14Z
date copyright2006/09/01
date issued2006
identifier issn0894-8755
identifier otherams-78324.pdf
identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4220981
description abstractMechanisms of global warming impacts on regional tropical precipitation are examined in a coupled atmosphere?ocean general circulation model (ECHAM4/OPYC3). The pattern of the regional tropical precipitation changes, once established, tends to persist, growing in magnitude as greenhouse gases increase. The sulfate aerosol induces regional tropical precipitation anomalies similar to the greenhouse gases but with opposite sign, thus reducing the early signal. Evidence for two main mechanisms, the upped-ante and the anomalous gross moist stability (M?) mechanisms (previously proposed in an intermediate complexity model), is found in this more comprehensive coupled general circulation model. Preferential moisture increase occurs in convection zones. The upped-ante mechanism signature of dry advection from nonconvective regions is found in tropical drought regions on the margins of convection zones. Here advection in both the atmospheric boundary layer and lower free troposphere are found to be important, with an additional contribution from horizontal temperature transport in some locations. The signature of the M? mechanism?moisture convergence due to increased moisture in regions of large mean vertical motion?enhances precipitation within strong convective regions. Ocean dynamical feedbacks can be assessed by net surface flux, the main example being the El Niño?like shift of the equatorial Pacific convection zone. Cloud?radiative feedbacks are found to oppose precipitation anomalies over ocean regions.
publisherAmerican Meteorological Society
titleRegional Tropical Precipitation Change Mechanisms in ECHAM4/OPYC3 under Global Warming
typeJournal Paper
journal volume19
journal issue17
journal titleJournal of Climate
identifier doi10.1175/JCLI3858.1
journal fristpage4207
journal lastpage4223
treeJournal of Climate:;2006:;volume( 019 ):;issue: 017
contenttypeFulltext


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