georefid:2005-035032SEDIS 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=2005-0350322004-01-01publicationgeorefid:2005-035032Ennyu, AtsuhitoPennsylvania State University, Department of Geosciences, University Park, PA, United StatesauthorArthur, Michael A.University of California at Santa Barbara, United StatesauthorAmerican Geophysical Union, Washington, DC, United StatespublisherdocumentHardcopyIn: Exon, Neville F. (editor), Kennett, James P. (editor), Malone, Mitchell (editor), The Cenozoic Southern Ocean; tectonics, sedimentation, and climate change between Australia and Antarctica151215-233Paleoclimate proxy records from the southern high latitudes can provide key constraints on the possible role of ocean circulation as a cause of the middle Miocene global cooling event and the major development of the Antarctic cryosphere. Paleotemperature reconstructions based on (super 18) O values of calcareous plankton suggest that the warm-season, near-surface waters in the subantarctic around the site paleo-locations were warmer than today by 2-4 degrees C until about 14 Ma. The sea-surface temperatures were probably ameliorated by a warm current from the west that joined the Circum-Antarctic current. The cold season near-surface temperatures were unaffected during this interval. Based on the Miocene plankton and benthic stable isotope records, we suggest that the cooled surface waters in the southern high latitudes contributed to the increased rate of production and dominance of cold southern-component deepwater after ca. 14.5 Ma. (modif. j. abstr.)completedStratigraphyalgaeAnomalinidaeAntarctic Circumpolar CurrentAntarctic ice sheetAntarcticaC-13/C-12carbonCassidulinaceaCenozoicCibicidoidesCibicidoides wuellerstorfiCoccolithophoraceaeCoccolithusEast Antarctic ice sheetEast Tasman PlateauForaminiferaGlobigerinaGlobigerina bulloidesGlobigerinaceaGlobigerinidaeGloboquadrinaInvertebrataisotope ratiosisotopesLeg 189lower Miocenemarine environmentmicrofossilsmiddle MioceneMiocenenannofossilsnannoplanktonNeogeneO-18/O-16ocean circulationOcean Drilling ProgramODP Site 1170ODP Site 1172OrbulinaOrbulina universaOridorsalisOridorsalis umbonatusoxygenPacific Oceanpaleo-oceanographypaleocirculationpaleoclimatologypaleocurrentspaleosalinitypaleotemperatureplanktonPlantaeProtistaRotaliinaseasonal variationsSouth PacificSouth Tasman RiseSouthern OceanSouthwest Pacificstable isotopessubantarctic regionsTasman SeaTasmanian GatewayTertiaryTethysWest Pacificurn:org.iodp:exp:189urnlargerWorkCitationcampaignurn:org.iodp:exp:189:site:1170urnlargerWorkCitationstudyurn:org.iodp:exp:189urnlargerWorkCitationcampaignurn:org.iodp:exp:189:site:1172urnlargerWorkCitationstudyurn:org.iodp:exp:189urnlargerWorkCitationcampaignEnglishgeoscientificInformation146.0200149.5600-47.1000-43.5700