noaa-ocean-8702 Crosta et al. 2004 Southern Ocean Diatom SST-Sea Ice Recons Crosta, X.; Sturm, A.; Armand, L.; Pichon, J.-J. Crosta et al. 2004 Southern Ocean Diatom SST-Sea Ice Recons 2004-07-01 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/8702 Investigator X. Crosta Investigator A. Sturm Investigator L. Armand Investigator J.-J. Pichon earth science paleoclimate paleoceanography delta 18O,Neogloboquadrina pachyderma sinistral,null,per mil PDB,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography age,null,null,calendar kiloyear before present,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography identified diatom,null,null,percent,null,paleoceanography,null,null,N,Diatom SAZ (Subantarctic Zone) Group earth science paleoclimate paleoceanography identified diatom,null,null,percent,null,paleoceanography,null,null,N,Eucampia antarctica earth science paleoclimate paleoceanography identified diatom,null,null,percent,null,paleoceanography,null,null,N,Hemidiscus karstenii earth science paleoclimate climate reconstructions|paleoceanography sea surface temperature,diatom assemblage,null,degree Celsius,Feb,climate reconstructions|paleoceanography,null,null,N,null earth science paleoclimate paleoceanography identified diatom,null,null,percent,null,paleoceanography,null,null,N,Diatom SIZ (Sea Ice Zone) Group earth science paleoclimate paleoceanography identified diatom,null,null,percent,null,paleoceanography,null,null,N,Diatom POOZ (Permanent Open Ocean Zone) Group earth science paleoclimate paleoceanography identified diatom,null,null,percent,null,paleoceanography,null,null,N,Diatom Strat (Water Stratification) Group earth science paleoclimate climate reconstructions|paleoceanography sea ice cover,diatom assemblage,null,month,null,climate reconstructions|paleoceanography,null,null,N,month per year earth science paleoclimate paleoceanography identified diatom,null,null,percent,null,paleoceanography,null,null,N,Extinct diatoms earth science paleoclimate paleoceanography depth,null,null,centimeter,null,paleoceanography,null,null,N,null earth science paleoclimate paleocean reconstruction geoscientificInformation Sea Ice Reconstruction Sea Surface Temperature Reconstruction 288440 cal yr BP 3220 cal yr BP Complete -56.67 -56.67 160.23 160.23 -3912 -3912 Ocean Pacific Ocean South Pacific Ocean SO136-111>LATITUDE -56.67>LONGITUDE 160.23 None 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. English DOC/NOAA/NESDIS/NCEI National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce https://www.ncdc.noaa.gov/data-access/paleoclimatology-data DATA Center Contact Bruce Bauer bruce.a.bauer@noaa.gov paleo@noaa.gov 303-497-6280 303-497-6513

325 Broadway, E/NE31

Boulder CO 80305-3328 USA online ASCII Crosta, X., A. Sturm, L. Armand, and J.-J. Pichon 2004 Marine Micropaleontology 50 209-223 10.1016/S0377-8398(03)00072-0

A Modern Analog Technique (MAT5201/31) has been applied to fossil diatom assemblages to provide down-core estimates of February sea-surface temperatures (SSTs) and of sea ice duration over the past 220 000 years at 56‡40PS, 160‡14PE. At the core location, sea ice progression lagged the SST drop by V1 ka at interglacial^glacial transitions, and sea ice retreat was almost synchronous to the SST increase at glacial^interglacial terminations. Sea ice increased continuously during glacial periods to reach its maximum extent at the end of glacial times, although SSTs were almost constant during glacials. This indicates that SSTs are the major parameter determining the advance and retreat of sea ice at transitions, but that the sea ice advance during glacial conditions may be related to positive feedbacks of the ice on albedo, air temperature and meridional wind stress. The strong correlation (r =0.75) between sea ice duration at the core location and the Vostok CO2 record argues for a control of Antarctic sea ice extent on atmospheric CO2 concentration via the modification of the ocean-to-atmosphere gas balance.

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