简介：Aregionalclimatemodelisemployedtosimulatetheaerosols(dust,sulfate,blackcarbon,andorganiccarbon)andtheirdirecteffectontheclimateoverChina.Theemphasisisonthedirectradiativeforcingduetothechangeinmixingstateofaerosols.Theresultsshowthatdirectradiativeforcingissignificantlydifferentbetweenexternallyandinternallymixedaerosols.Atthetopoftheatmosphere(TOA),theradiativeforcingofexternallymixedaerosolsislargerthanthatofinternallymixedones,especiallyintheTarimdesertregionwherethedifferenceisabout0.7Wm2.Atthesurface,however,thesituationbecomesopposite,especiallyintheSichuanbasinwherethedifferenceisabout-1.4Wm2.Nonetheless,eitherexternallyorinternallymixedaerosolsinChinacanresultinasignificantcoolingeffect,exceptforthewarminginSouthChinainwinterandtheslightwarminginNorthChinainFebruary.Thecoolingeffectinducedbyexternallymixedaerosolsisweakerthanthatinducedbyinternallymixedaerosols,andthisismoreobviousinspringandwinterthaninsummerandautumn.Inspringandsummer,theinhibitingeffectofexternallymixedaerosolsonprecipitationislessthanthatofinternallymixedaerosols,whereasinautumnandwinterthedifferenceisnotobvious.

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