georefid:2013-043982SEDIS Publication Catalogueana.macario@awi.dehttp://sedis.iodp.org/pub-catalogue/informationpointOfContact2013-07-08T00:00:00Zhttp://sedis.iodp.org/pub-catalogue/index.php?id=2013-043982<gco:CharacterString>Marine productivity response to Heinrich events; a model-data comparison</gco:CharacterString>2012-01-01publicationgeorefid:2013-043982Mariotti, VeroniqueCEA-CNRS-UVSQ, Institute Pierre Simon Laplace, Laboratoire des Sciences du Climat et de l'Environnement, Gif-sur-Yvette, FranceauthorBopp, LaurentUniversity of Cape Town, South AfricaauthorTagliabue, AlessandroCouncil for Scientific and Industrial Research, South AfricaauthorKageyama, MasaauthorSwingedouw, DidierauthorCopernicus, Katlenburg-Lindau, InternationalpublisherdocumentDigitalClimate of the Past8 (5)1581-1598Marine sediments records suggest large changes in marine productivity during glacial periods, with abrupt variations especially during the Heinrich events. Here, we study the response of marine biogeochemistry to such an event by using a biogeochemical model of the global ocean (PISCES) coupled to an ocean-atmosphere general circulation model (IPSL-CM4). We conduct a 400-yr-long transient simulation under glacial climate conditions with a freshwater forcing of 0.1 Sv applied to the North Atlantic to mimic a Heinrich event, alongside a glacial control simulation. To evaluate our numerical results, we have compiled the available marine productivity records covering Heinrich events. We find that simulated primary productivity and organic carbon export decrease globally (by 16% for both) during a Heinrich event, albeit with large regional variations. In our experiments, the North Atlantic displays a significant decrease, whereas the Southern Ocean shows an increase, in agreement with paleo-productivity reconstructions. In the Equatorial Pacific, the model simulates an increase in organic matter export production but decreased biogenic silica export. This antagonistic behaviour results from changes in relative uptake of carbon and silicic acid by diatoms. Reasonable agreement between model and data for the large-scale response to Heinrich events gives confidence in models used to predict future centennial changes in marine production. In addition, our model allows us to investigate the mechanisms behind the observed changes in the response to Heinrich events.completedQuaternary geologyAfricaalgaeammoniumArctic OceanArctic regionAtlantic Oceanatmospheric transportBenguela Currentbiochemistrycarboncarbon dioxideCenozoicDetroit SeamountdiatomsEast PacificecosystemsEmperor SeamountsEquatorial Pacificglacial environmentGreenlandGreenland ice sheetHeinrich eventsHoloceneiceIndian Oceanironlast glacial maximumLeg 145Leg 167Leg 184Leg 202marine sedimentsMauritaniametalsmicrofossilsmineralizationnitratesNorth AtlanticNorth PacificNortheast PacificNorthwest PacificOcean Drilling ProgramODP Site 1019ODP Site 1144ODP Site 1233ODP Site 1240ODP Site 1242ODP Site 882ODP Site 887organic carbonPacific OceanpaleoproductivityPanama Basinparticlesparticulate materialsPelagic Interaction Scheme for Carbon and Ecosystem StudiesphosphatesphotochemistryphotosynthesisphytoplanktonplanktonPlantaeQuaternaryrespirationsea icesea-surface temperaturesedimentationsedimentssilicic acidsolutesSouth China SeaSouth PacificSoutheast PacifictransportvolcanismWest AfricaWest Pacificwindsworld oceanurn:org.iodp:exp:145urnlargerWorkCitationcampaignurn:org.iodp:exp:167urnlargerWorkCitationcampaignurn:org.iodp:exp:184urnlargerWorkCitationcampaignurn:org.iodp:exp:202urnlargerWorkCitationcampaignurn:org.iodp:exp:167:site:1019urnlargerWorkCitationstudyurn:org.iodp:exp:167urnlargerWorkCitationcampaignurn:org.iodp:exp:184:site:1144urnlargerWorkCitationstudyurn:org.iodp:exp:184urnlargerWorkCitationcampaignurn:org.iodp:exp:202:site:1233urnlargerWorkCitationstudyurn:org.iodp:exp:202urnlargerWorkCitationcampaignurn:org.iodp:exp:202:site:1240urnlargerWorkCitationstudyurn:org.iodp:exp:202urnlargerWorkCitationcampaignurn:org.iodp:exp:202:site:1242urnlargerWorkCitationstudyurn:org.iodp:exp:202urnlargerWorkCitationcampaignurn:org.iodp:exp:145:site:882urnlargerWorkCitationstudyurn:org.iodp:exp:145urnlargerWorkCitationcampaignurn:org.iodp:exp:145:site:887urnlargerWorkCitationstudyurn:org.iodp:exp:145urnlargerWorkCitationcampaignEnglishgeoscientificInformation-83.3600-82.28000.01007.5100Includes supplement, http://www.clim-past.net/8/1581/2012/cp-8-1581-2012-supplement.pdf; published in Climate of the Past Discussion: 14 February 2012, http://www.clim-past-discuss.net/8/557/2012/cpd-8-557-2012.html; accessed in Feb., 2013application/pdfunknownSEDIS Publication Catalogueana.macario@awi.dehttp://sedis.iodp.org/pub-catalogue/informationpointOfContacthttp://www.clim-past.net/8/1581/2012/cp-8-1581-2012.pdfdownload