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1、PollutionFromAsiaMakesPacificStormsStrongerAerosolsinatmospherechangeweatherinNorthAmerica,saysnewstudy.BuildingsinLianyungang,China,areshroudedinsmogonDecember8,2013.AerosolpollutionfromAsiaislikelyleadingtostrongercyclonesinthePacific,moreprecipitation,andwarmingtemperatures
2、attheNorthPole.PHOTOGRAPHBYCHINAFOTO/GETTYIMAGESBrianClarkHowardNationalGeographicPUBLISHEDAPRIL14,2014WhathappensinAsiadoesn'tstayinAsia,anewstudywarns.PollutionfromboomingeconomiesintheFarEastiscausingstrongerstormsandchangingweatherpatternsoverthePacificOcean,whichinturnisc
3、hangingweatherinNorthAmerica,scientistsreport."Whethertheweather[inNorthAmerica]willchangeinagooddirectionorbadishardtosayatthistime,"saysRenyiZhang,aprofessorofatmosphericsciencesatTexasA&MUniversityinCollegeStation.Zhangisaco-author,alongwithseveralscientistsfromtheU.S.andCh
4、ina,ofastudyreleasedintheProceedingsoftheNationalAcademyofSciencesonMonday.ThescientistssaypollutionfromAsiaislikelyleadingtostrongercyclonesinthemidlatitudesofthePacific,moreprecipitation,andafastermovementofheatfromthetropicstowardtheNorthPole.Asaresultofthesechanges,"it'sal
5、mostcertainthatweatherintheU.S.ischanging,"saysZhang.SmallerDrops,BiggerStormsZhangandhiscolleaguesusedcomputermodelingtostudytheeffectsontheweatherofaerosols,whicharefineparticlessuspendedintheair.ThemainnaturalaerosolsoverthePacificareseasalttossedupbywavesanddustblownoffthe
6、land.Butthosenaturalparticlesarenowincreasinglyoutnumberedbyhuman-madeones.AccordingtoZhang,themostsignificantaerosolstheteamconsideredaresulfates,whichareemittedprimarilybycoal-firedpowerplants.Otheraerosolpollutantsarereleasedbyvehicleemissionsandindustrialactivities.Intheat
7、mosphere,suchaerosolsscatterandabsorbsunlight,andthushavebothcoolingandwarmingeffectsonclimate.Buttheyalsoaffecttheformationofcloudsandprecipitation—andthemagnitudeofthatindirecteffectoncloudsisoneofthebiggestuncertaintieshamperingscientists'abilitytoforecastclimatechange.Clou
8、dsformwhenwatervaporcondensesaroundaerosolparticlestoformliqu
