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contributor authorAckerley, Duncan
contributor authorHighwood, Eleanor J.
contributor authorFrame, David J.
contributor authorBooth, Ben B. B.
date accessioned2017-06-09T16:28:52Z
date available2017-06-09T16:28:52Z
date copyright2009/10/01
date issued2009
identifier issn0894-8755
identifier otherams-68645.pdf
identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4210226
description abstractA large ensemble of general circulation model (GCM) integrations coupled to a fully interactive sulfur cycle scheme were run on the climateprediction.net platform to investigate the uncertainty in the climate response to sulfate aerosol and carbon dioxide (CO2) forcing. The sulfate burden within the model (and the atmosphere) depends on the balance between formation processes and deposition (wet and dry). The wet removal processes for sulfate aerosol are much faster than dry removal and so any changes in atmospheric circulation, cloud cover, and precipitation will feed back on the sulfate burden. When CO2 is doubled in the Hadley Centre Slab Ocean Model (HadSM3), global mean precipitation increased by 5%; however, the global mean sulfate burden increased by 10%. Despite the global mean increase in precipitation, there were large areas of the model showing decreases in precipitation (and cloud cover) in the Northern Hemisphere during June?August, which reduced wet deposition and allowed the sulfate burden to increase. Further experiments were also undertaken with and without doubling CO2 while including a future anthropogenic sulfur emissions scenario. Doubling CO2 further enhanced the increases in sulfate burden associated with increased anthropogenic sulfur emissions as observed in the doubled CO2-only experiment. The implications are that the climate response to doubling CO2 can influence the amount of sulfate within the atmosphere and, despite increases in global mean precipitation, may act to increase it.
publisherAmerican Meteorological Society
titleChanges in the Global Sulfate Burden due to Perturbations in Global CO2 Concentrations
typeJournal Paper
journal volume22
journal issue20
journal titleJournal of Climate
identifier doi10.1175/2009JCLI2536.1
journal fristpage5421
journal lastpage5432
treeJournal of Climate:;2009:;volume( 022 ):;issue: 020
contenttypeFulltext


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