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1、GLOBALBIOGEOCHEMICALCYCLES,VOL.16,NO.4,1072,doi:10.1029/2001GB001766,2002Globalbiogeochemicalcycleofboron1HaewonParkandWilliamH.SchlesingerDivisionofEarthandOceanSciences,NicholasSchooloftheEnvironmentandEarthSciences,DukeUniversity,Durham,NorthCarolina,USAReceived30Septe
2、mber2001;revised16May2002;accepted4June2002;published5November2002.[1]TheglobalBoron(B)cycleisprimarilydrivenbyalargeflux(1.44TgB/yr)throughtheatmospherederivedfromseasaltaerosols.Othersignificantsourcesofatmosphericboronincludeemissionsduringthecombustionofbiomass(0.26–0
3、.43TgB/yr)andcoal,whichadds0.20TgB/yrasananthropogeniccontribution.Theseknowninputstotheatmospherecannotaccountfortheboronremovedfromtheatmosphereduringrainfall(3.0TgB/yr)andestimateddrydeposition(1.3–2.7TgB/yr).Inadditiontoatmosphericdeposition,rockweatheringisasourceofb
4、oron(0.19TgB/yr)forterrestrialecosystems,andhumansmineabout0.31TgB/yrfromtheEarth’scrust.Morethan4.8TgB/yrcirculatesinthebiogeochemicalcycleoflandplants,andabout0.53–0.63TgB/yriscarriedfromlandtoseabyrivers.Thebiogeochemicalcycleofboronintheseaincludes4.4TgB/yrcirculating
5、inthemarinebiosphere,andanannuallossof0.47TgB/yrtotheoceaniccrustviaavarietyofsedimentaryprocessesthatcollectivelyremoveonlyasmallfractionofthetotalannualinputstotheoceans.ThuswithourcurrentunderstandingoftheglobalbiogeochemistryofB,theatmosphericbudgetshowsoutputs>inputs
6、,whilethemarinecompartmentsshowinputs>outputs.Despitetheseuncertainties,itisclearthatthehumanperturbationoftheglobalBcyclehasmorethandoubledthemobilizationofBfromthecrustandcontributessignificantlytotheBtransportinrivers.INDEXTERMS:0305AtmosphericCompositionandStructure:A
7、erosolsandparticles(0345,4801);0330AtmosphericCompositionandStructure:Geochemicalcycles;1610GlobalChange:Atmosphere(0315,0325);1615GlobalChange:Biogeochemicalprocesses(4805);4825Oceanography:BiologicalandChemical:Geochemistry;KEYWORDS:atmosphericdeposition,biogeochemistry
8、,biomassburning,boron,geochemicalcycles,humanimpacts,hydrothermalactivityCitation:Park,H.,andW.H
