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1、GLOBALBIOGEOCHEMICALCYCLES,VOL.19,GB4021,doi:10.1029/2004GB002427,2005ModelingtheprimaryandsecondaryproductionsofthesouthernBenguelaupwellingsystem:Acomparativestudythroughtwobiogeochemicalmodels1123411V.Kone′,E.Machu,P.Penven,V.Andersen,V.Garc?on,P.Fre′on,andH.DemarcqR
2、eceived9December2004;revised1August2005;accepted25October2005;published21December2005.[1]Athree-dimensionalprimitiveequationmodel,theRegionalOceanModelingSystems(ROMS),coupledtotwobiogeochemicalconfigurations(NPZDandN2P2Z2D2)wasusedtostudythedynamicsofthefirsttrophiclev
3、elsofthepelagicfoodwebinthesouthernBenguelaupwellingsystem.ThedomainextendsfromtheAgulhasBankborderedbytheAgulhasCurrentto27°SonthewestcoastofSouthAfrica.Thecirculationisdrivenbymonthlyclimatologiesofatmosphericforcingfields.TheNPZDecosystemmodelconsistsoffourstatevaria
4、bles:nutrient(nitrate),phytoplankton,zooplanktonanddetritus.IntheN2P2Z2D2model,ammoniumhasbeenaddedandthethreeothervariableshavebeendividedintosmallandlargeorganismsordetritus.Bothmodelsareabletoreproducethespatio-temporalphytoplanktondistribution.Alongthewestcoast,chlo
5、rophyllconcentrationsmaximaareassociatedtosurfacewaters.Westwarddominatingwindsgeneratethelowestchlorophyllconcentrationsencounteredinwinter.ThesmallphytoplanktonorganismssimulatedbytheN2P2Z2D2modelareresponsibleforaweakerchlorophyllinshore/offshoregradient,incloseragre
6、ementwithobservations.Transitionsfromaregimedominatedbynewproduction(highfratio)toonedominatedbyregeneratedproduction(lowfratio)happentobeabrupt,underlyingtheconstantcompetitionbetweensmallandlargeorganismswithregardtoupwellinginducednutrientinputs.OntheAgulhasBank,thes
7、ummerenrichmentisassociatedwithsubsurfacemaxima,whileinwinter,mixingbystormsresultsinahomogeneousphytoplanktondistributioninthewatercolumn.Regeneratedproductionplaysanimportantroleinmaintainingthetotalphytoplanktongrowth.Zooplanktonbiomassreflectstheoverallpatternsofchl
8、orophyllaconcentrationswithdifferencesbetweenthewestcoastandtheAgulhasBank,consistentwithdata,anditsdistributi
