georefid:2005-069391SEDIS Publication Catalogue

ana.macario@awi.de

http://sedis.iodp.org/pub-catalogue/informationpointOfContact2011-06-23T00:00:00Zhttp://sedis.iodp.org/pub-catalogue/index.php?id=10.1038/nature023572004-01-01publicationgeorefid:2005-069391doi:10.1038/nature02357Sigman, Daniel M.Princeton University, Department of Geosciences, Princeton, NJ, United StatesauthorJaccard, Samuel L.ETH-Zurich, SwitzerlandauthorHaug, Gerald H.Geoforschungszentrum Potsdam, Federal Republic of GermanyauthorMacmillan Journals, London, United KingdompublisherdocumentHardcopyNature (London)428 (6978)59-63The low-latitude ocean is strongly stratified by the warmth of its surface water. As a result, the great volume of the deep ocean has easiest access to the atmosphere through the polar surface ocean. In the modern polar ocean during the winter, the vertical distribution of temperature promotes overturning, with colder water over warmer, while the salinity distribution typically promotes stratification, with fresher water over saltier. Here we present deep-sea records of biogenic opal accumulation and sedimentary nitrogen isotopic composition from the Subarctic North Pacific Ocean and the Southern Ocean. These records indicate that vertical stratification increased in both northern and southern high latitudes 2.7 million years ago, when Northern Hemisphere glaciation intensified in association with global cooling during the late Pliocene epoch. (mod. journ. abst.)completedStratigraphyArctic Oceancarbon dioxideCenozoicclimate changeconcentrationcoresiceicebergsisotopesLeg 145Leg 178N-15/N-14NeogenenitrogenNorth Pacificocean circulationOcean Drilling ProgramODP Site 1096ODP Site 882Pacific Oceanpaleo-oceanographypaleoclimatologypaleotemperaturePleistocenePliocenepolar regionsQuaternarysalinitysea icesea waterSouthern Oceanstable isotopesstratificationTertiaryupper Plioceneurn:org.iodp:exp:145urnlargerWorkCitationcampaignurn:org.iodp:exp:178urnlargerWorkCitationcampaignurn:org.iodp:exp:178:site:1096urnlargerWorkCitationstudyurn:org.iodp:exp:178urnlargerWorkCitationcampaignurn:org.iodp:exp:145:site:882urnlargerWorkCitationstudyurn:org.iodp:exp:145urnlargerWorkCitationcampaignEnglishgeoscientificInformation-76.5749167.3600-67.340150.2148