{"NOAAStudyId":"21331","contactInfo":{"address":"325 Broadway, E/NE31","city":"Boulder","constraints":"Please cite original publication, online resource, dataset and publication DOIs (where available), and date accessed when using downloaded data. If there is no publication information, please cite investigator, title, online resource, and date accessed. The appearance of external links associated with a dataset does not constitute endorsement by the Department of Commerce/National Oceanic and Atmospheric Administration of external Web sites or the information, products or services contained therein. For other than authorized activities, the Department of Commerce/NOAA does not exercise any editorial control over the information you may find at these locations. These links are provided consistent with the stated purpose of this Department of Commerce/NOAA Web site.","country":"USA","dataCenterUrl":"https://www.ncdc.noaa.gov/data-access/paleoclimatology-data","email":"paleo@noaa.gov","fax":"303-497-6513","longName":"National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce ","phone":"303-497-6280","postalCode":"80305-3328","shortName":"DOC/NOAA/NESDIS/NCEI","state":"CO","type":"CONTACT INFORMATION"},"contributionDate":"2017-01-31","dataPublisher":"NOAA","dataType":"PALEOCLIMATIC MODELING","dataTypeInformation":"https://www.ncdc.noaa.gov/data-access/paleoclimatology-data/datasets/paleoclimatology-modeling","difMetadataLink":"http://www1.ncdc.noaa.gov/pub/data/metadata/published/paleo/dif/xml/noaa-model-21331.xml","doi":null,"earliestYearBP":null,"earliestYearCE":null,"entryId":"noaa-model-21331","funding":[{"fundingAgency":"US National Science Foundation","fundingGrant":"OCE-1131834, OCE-1235544"}],"investigators":"Muglia, J.; Somes, C.J.; Nickelsen, L.; Schmittner, A.","mostRecentYearBP":null,"mostRecentYearCE":null,"onlineResourceLink":"https://www.ncdc.noaa.gov/paleo/study/21331","originalSource":null,"publication":[{"abstract":"Changes in the ocean iron cycle during the Last Glacial Maximum (LGM) have been proposed to help explain the low atmospheric CO2 from this period. Previous global modeling studies, however, have only considered changes in aeolian iron fluxes, although it is known that sedimentary and hydrothermal fluxes are important iron sources for today's ocean. Here we evaluate the effect of preindustrial-to-LGM changes in atmospheric dust, sedimentary, and hydrothermal fluxes on the ocean's iron and carbon cycles in a global coupled biogeochemical circulation model. Considering variable iron solubility we find that higher dust fluxes into the ocean in the LGM increase productivity and enhance the biological pump, sequestering carbon in deep waters and lowering CO2 by 4 ppm. The effect is countered by a decrease in sedimentary release of iron due to lower sea level, which increases CO2 by 15 ppm. In an upper-limit estimation of Southern Ocean surface iron fertilization, assuming a 10 times higher solubility for this region, combined with changes in sedimentary release we find an increase in deep dissolved inorganic carbon concentrations, that could potentially reduce atmospheric CO2 by 13 ppm. A five-fold increase in hydrothermal sources of iron during the LGM may have decreased atmospheric CO2 by an additional 6 ppm. We conclude that when addressing LGM-preindustrial changes in the ocean iron cycle, not only surface but also sedimentary and hydrothermal fluxes have to be taken into account.","author":{"name":"Muglia, Juan, Christopher Somes, Levin Nickelsen, and Andreas Schmittner"},"citation":"Muglia, Juan, Christopher Somes, Levin Nickelsen, and Andreas Schmittner. 2017. Combined effects of atmospheric and seafloor iron fluxes to the glacial ocean. Paleoceanography, submitted. ","edition":null,"identifier":null,"issue":null,"journal":"Paleoceanography","pages":null,"pubRank":"1","pubYear":2017,"reportNumber":null,"title":"Combined effects of atmospheric and seafloor iron fluxes to the glacial ocean","type":"publication","volume":"submitted"}],"reconstruction":"N","scienceKeywords":["Last Glacial Maximum"],"site":[{"NOAASiteId":"56870","geo":{"geoType":"Feature","geometry":{"coordinates":["-80","90","-180","180"],"type":"POLYGON"},"properties":{"easternmostLongitude":"180","maxElevationMeters":null,"minElevationMeters":null,"northernmostLatitude":"90","southernmostLatitude":"-80","westernmostLongitude":"-180"}},"locationName":"Geographic Region>Global Ocean","mappable":"N","paleoData":[{"NOAADataTableId":"32144","coreLengthMeters":null,"dataFile":[{"NOAAKeywords":["earth science>paleoclimate>model>ocean model"],"fileUrl":"https://www1.ncdc.noaa.gov/pub/data/paleo/gcmoutput/muglia2017/","linkText":"Data and Supporting Files","urlDescription":"Data 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