georefid:2013-009795SEDIS Publication Catalogueana.macario@awi.dehttp://sedis.iodp.org/pub-catalogue/informationpointOfContact2013-07-08T00:00:00Zhttp://sedis.iodp.org/pub-catalogue/index.php?id=2013-009795<gco:CharacterString>A transfer function for the prediction of gas hydrate inventories in marine sediments</gco:CharacterString>2010-01-01publicationgeorefid:2013-009795Marquardt, MathiasIFM-GEOMAR, Leibniz-Institut fuer Meereswissenschaften, Kiel, GermanyauthorHensen, ChristianauthorPinero, ElenaauthorWallmann, KlausauthorHaeckel, MatthiasauthorCopernicus GmbH on behalf of the European Union, Katlenburg-Lindau, InternationalpublisherdocumentDigitalBiogeosciences7 (9)2925-2941A simple prognostic tool for gas hydrate (GH) quantification in marine sediments is presented based on a diagenetic transport-reaction model approach. One of the most crucial factors for the application of diagenetic models is the accurate formulation of microbial degradation rates of particulate organic carbon (POC) and the coupled formation of biogenic methane. Wallmann et al. (2006) suggested a kinetic formulation considering the ageing effects of POC and accumulation of reaction products (CH (sub 4) , CO (sub 2) ) in the pore water. This model is applied to data sets of several ODP sites in order to test its general validity. Based on a thorough parameter analysis considering a wide range of environmental conditions, the POC accumulation rate (POCar in g/m (super 2) /yr) and the thickness of the gas hydrate stability zone (GHSZ in m) were identified as the most important and independent controls for biogenic GH formation. Hence, depth-integrated GH inventories in marine sediments (GHI in g of CH (sub 4) per cm (super 2) seafloor area) can be estimated as: GHI=a.POCar.GHSZ (super b) .exp(-GHSZ (super c/POCar) /d)+e with a=0.00214, b=1.234, c=-3.339, d=0.3148, e=-10.265. The transfer function gives a realistic first order approximation of the minimum GH inventory in low gas flux (LGF) systems. The overall advantage of the presented function is its simplicity compared to the application of complex numerical models, because only two easily accessible parameters need to be determined.completedOceanographyaliphatic hydrocarbonsalkanesAtlantic Oceanbiogenic processesBlake-Bahama Outer RidgeCape BasincarbondepthEast PacificEquatorial Pacificgas hydrateshydrocarbonsLeg 112Leg 164Leg 167Leg 170Leg 175Leg 201Leg 202marine sedimentsmethanenitrogenNorth AtlanticNorth PacificNortheast Pacificnumerical modelsOcean Drilling ProgramODP Site 1014ODP Site 1041ODP Site 1084ODP Site 1230ODP Site 1233ODP Site 685ODP Site 995organic carbonorganic compoundsPacific Oceanparticulate materialsPeru-Chile Trenchpore waterporositypredictionsedimentationsedimentation ratessedimentsSouth AtlanticSouth PacificSoutheast Pacifictransfer functionsurn:org.iodp:exp:112urnlargerWorkCitationcampaignurn:org.iodp:exp:164urnlargerWorkCitationcampaignurn:org.iodp:exp:167urnlargerWorkCitationcampaignurn:org.iodp:exp:170urnlargerWorkCitationcampaignurn:org.iodp:exp:175urnlargerWorkCitationcampaignurn:org.iodp:exp:201urnlargerWorkCitationcampaignurn:org.iodp:exp:202urnlargerWorkCitationcampaignurn:org.iodp:exp:167:site:1014urnlargerWorkCitationstudyurn:org.iodp:exp:167urnlargerWorkCitationcampaignurn:org.iodp:exp:170:site:1041urnlargerWorkCitationstudyurn:org.iodp:exp:170urnlargerWorkCitationcampaignurn:org.iodp:exp:175:site:1084urnlargerWorkCitationstudyurn:org.iodp:exp:175urnlargerWorkCitationcampaignurn:org.iodp:exp:201:site:1230urnlargerWorkCitationstudyurn:org.iodp:exp:201urnlargerWorkCitationcampaignurn:org.iodp:exp:202:site:1233urnlargerWorkCitationstudyurn:org.iodp:exp:202urnlargerWorkCitationcampaignurn:org.iodp:exp:112:site:685urnlargerWorkCitationstudyurn:org.iodp:exp:112urnlargerWorkCitationcampaignurn:org.iodp:exp:164:site:995urnlargerWorkCitationstudyurn:org.iodp:exp:164urnlargerWorkCitationcampaignEnglishgeoscientificInformation-119.585313.0140-41.000032.5002Includes appendices; published in Biogeosciences Discussion: 12 February 2010, http://www.biogeosciences-discuss.net/7/1057/2010/bgd-7-1057-2010.html; accessed in Dec., 2011application/pdfunknownSEDIS Publication Catalogueana.macario@awi.dehttp://sedis.iodp.org/pub-catalogue/informationpointOfContacthttp://www.biogeosciences.net/7/2925/2010/bg-7-2925-2010.pdfdownload