Estimates of particulate organic carbon over the euphotic depth from in situ measurements. Application to satellite data over the global ocean

Lucile Duforêt-Gaurier (1) , Hubert Loisel (1) , D. Dessailly (1) , K. Nordkvist (1) , Séverine Alvain (1)

1 LOG - Laboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187

Knowledgeoftheoceanicparticulateorganiccarbon(POC)poolandofitsspatio-temporalvariabilityis importantforunderstandingtheoceaniccarboncycle.Untilnow,POCestimatesfromspacehavebeen restrictedtothesurfacelayer.AnempiricalalgorithmisdevelopedtoderivethePOCcontentintegrated overtheeuphoticlayer(POCZeu) fromthenear-surfacePOCconcentration(POCsurf ).Therelationshipfollows a power-lawdistribution,POCZeu ¼ APOCB surf, with A and B depending onthetypeofwaters(stratifiedor well-mixed)andonthenear-surfacechlorophyllconcentration.AglobalclimatologyofPOCsurf andPOCZeu is generatedfromtheSeaWiFSarchivebetween1998and2006.TheglobalpatternsofPOCsurf and POCZeu follow themajorgyresystemsandotherlarge-scalecirculationfeatures.HighsurfaceandintegratedPOC content, around150mgm 3 and 6000mgm 2, areencounteredathighlatitude,whereaslowcontent, o50mgm 3 and 2000mgm 2, areobservedinsubtropicalgyres.ThemeanglobalvaluesofPOCsurf and POCZeu overtheglobaloceanare53mgm 3 and 3742mgm 2. ThestandingstocksofPOCare3:92 1014 and 1:19 1015 g overthefirstpenetrationandeuphoticdepth,respectively

Domaines: Océanographie

Lucile Duforêt-Gaurier, Hubert Loisel, D. Dessailly, K. Nordkvist, Séverine Alvain. Estimates of particulate organic carbon over the euphotic depth from in situ measurements. Application to satellite data over the global ocean. Deep Sea Research, 2010, pp.351-367. ⟨hal-00762599⟩