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1、ELSEVIERMarineChemistry53(1996)51-67TracemetalsinsuspendedparticulatematterofAtlanticOceansurfacewater(40°Nto20S)EckardHelmersAlfredWegenerInstituteforPolarandMarineResearch,Bremerhauen,GermanyReceived25August1994;accepted29June1995AbstractInthissynopticstudythedis
2、tributionandtraceelementcompositionofoceanicsuspendedparticulatematter(SPM)arepresented.SPMwasextractedfromupto10001ofsurfaceseawaterbyacontinuousflowtechniqueat34transectsalongtheAtlanticOcean.Withanoverallaverageof27pg/l,concentrationsofSPMrangedfromlessthan1ug/l
3、inthesouthwesternAtlantictoamaximumof115pg/lintheopenoceanoffWestAfrica.ParticulateconcentrationsofAl,Cd,Cu,Fe,MnandPbanddistributionofparticulateorganiccarbon(POC)weredeterminedrevealingsignificantandsurprisingspatialandseasonalvariations:althoughsamplingwasperfor
4、medontwocruisesatdifferentlongitudesandseasons,particulateAl,Fe,MnandPbconcentrationswereverysimilar.Unlikethesefourelements,distinctseasonaldifferencesinparticulateCdconcentrationwerefoundandtracedbacktobiologicalactivity.ClearlydistinguishedpeakconcentrationsforA
5、l(7.1nM)andFe(2.5nM)werefoundintheIntertropicalConvergenceZone(ITCZ),whilemaximaforCd(7.6PM),Cu(24pM)andPb(1.1PM)werelocatedfurthernorthinthesubtropics.AsignificantcorrelationbetweenPOCandallsixmetalsisfurtherreported.SPMinvestigatedinthisstudywasfoundtoconsistmain
6、lyofphytoplankton.CorrespondingdissolvedAl,Cd,CuandPbconcentrationsinsurfaceseawaterarereported.Comparisonwiththeparticulatefractionshowsthatmorethan90%ofCd,CuandPbandmorethan80%ofAlarelocalizedinthedissolvedstate.1.IntroductionStummandBrauner,1975).Thedissolvedsta
7、tethenisdifferentiatedin(organically)complexedandcol-Traceelementsinaquaticsystemsaredistributedloidalspecies(e.g.RileyandChester,1981).Thisoverdifferentcompartmentssuchasthedissolvedspeciationschemewasadaptedfortracemetalspeci-state,SPM(abioticorbiotic),higherorga
8、nismsasationanalysisinopenoceanseawater(e.g.Helmers,e.g.zooplankton,andthecolloidalstate.Concerning1994).themarineenvironment,aspeciationschemewa
