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专业英语温室效应ppt课件.ppt

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UnitFour:TheGreenhouseEffectNewwords:Infraredradiation红外辐射 Climaticfeedback气候反馈 Snowcover雪盖 Etal.等等（人）etc.等等（物） 4567辐射大气窗:7~13大气中的辐射传输过程111213ppm:partpermillion15P1:①Manisreversingmillionsofyearsofnaturalevolutionbyputtingintotheatmospherecarbonthathadbeensequesteredovertheagesasfossilfuels.②AtmosphericconcentrationsofCO2arelikelytodouble,andpossiblytriple,by2100.③Becausenohistoricalprecedentexists,reasonableexpectationsaboutfutureclimatemustbebasedonscientificevidence,notgeologicalrecords.④Afterevaluatingtheavailableevidence,theNationalAcademyofSciencesconcludedthatadoublingofatmosphericconcentrationsofCO2wouldwarmtheearth’saveragetemperature1.5-4.5℃. 17P2:①Thegreenhouseeffectoftheatmospherehasneverbeendoubted.②Moreofthesun’sradiationisvisiblelight,whichpassesthroughtheatmospherelargelyundeterred.③Whentheradiationstrikestheearth,itwarmsthesurface,whichthenradiatestheheatasinfraredradiation.However,atmosphericCO2,watervapor,andsomeothergasesabsorbtheinfraredradiationratherthanallowittopassundeterredlythroughtheatmospheretospace.④Becausetheatmospheretrapstheheatandwarmstheearthinamannersomewhatanalogoustotheglasspanelsofagreenhouse,thisphenomenonisgenerallyknownasthe“greenhouseeffect”.Withoutthiseffect,theearthwouldbe33℃(60℉)colderthatitiscurrently. P3:①TheextenttowhichCO2absorbsheathasbeenknownforalmostacentury,ScientistsshowthatdoublingofatmosphericCO2wouldraisetheaveragetemperature1.2℃ifnothingelseintheearth’sclimaticsystemchanged.②However,manypartsoftheclimatewillchange,amplifyingthedirectimpactofCO2.③Becausethesechangesarenotcompletelyunderstood,thetotalwarmingisdifficulttoestimate.④ThecurrentuncertaintysurroundingtheimpactofCO2onaveragetemperatureiscenteredaroundtheseclimatic“feedback”,notthedirectwarmingfromCO2. P4：①Themostimportantfeedbackwillresultfromthewarmeratmosphere’sabilitytoretainmoisture.②Becausewatervaporalsoabsorbsinfraredradiation,additionalheatingwillresult.③Hansoneral.estimatethatdoubleCO2wouldincreasetheatmosphere’swatervaporcontent30%,heatingt