noaa-icecore-22590 Antarctic Holocene Ice and Sediment Core Isotope, Chemical, and Diatom Data Mezgec, K.; Stenni, B.; Crosta, X.; Masson-Delmotte, V.; Baroni, C.; Braida, M.; Ciardini, V.; Colizza, E.; Melis, R.; Salvatore, M.C.; Severi, M.; Scarchilli, C.; Traversi, R.; Udisti, R.; Frezzotti, M. Antarctic Holocene Ice and Sediment Core Isotope, Chemical, and Diatom Data 2017-11-06 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/22590 Investigator K. Mezgec Investigator B. Stenni Investigator X. Crosta Investigator V. Masson-Delmotte Investigator C. Baroni Investigator M. Braida Investigator V. Ciardini Investigator E. Colizza Investigator R. Melis Investigator M.C. Salvatore Investigator M. Severi Investigator C. Scarchilli Investigator R. Traversi Investigator R. Udisti Investigator M. Frezzotti earth science paleoclimate ice cores ice age,null,null,calendar year before present,null,ice cores,null,null,N,Dating Severi et al. 2012 CP earth science paleoclimate ice cores depth at sample end,null,null,meter,null,ice cores,null,null,N,top depth earth science paleoclimate ice cores sodium,bulk ice,null,microgram per liter,null,ice cores,null,null,N,null earth science paleoclimate paleoceanography identified diatom,sediment,null,percent,null,paleoceanography,null,null,N,Chaetoceros Hyalochaete resting spores relative abundance earth science paleoclimate paleoceanography age,null,null,calendar year before present,null,paleoceanography,null,null,N,null earth science paleoclimate ice cores delta 2H,bulk ice,null,per mil VSMOW,null,ice cores,null,isotope ratio mass spectrometry,N,null earth science paleoclimate ice cores non-sea-salt calcium,bulk ice,null,microgram per liter,null,ice cores,null,null,N,null earth science paleoclimate ice cores delta 18O,bulk ice,null,per mil VSMOW,null,ice cores,null,isotope ratio mass spectrometry,N,null earth science paleoclimate ice cores deuterium excess,bulk ice,null,per mil VSMOW,null,ice cores,null,isotope ratio mass spectrometry,N,null earth science paleoclimate paleoceanography depth at sample end,null,null,centimeter,null,paleoceanography,null,null,N,top depth earth science paleoclimate paleoceanography identified diatom,sediment,null,percent,null,paleoceanography,null,null,N,Fragilariopsis kerguelensis relative abundance earth science paleoclimate paleoceanography identified diatom,sediment,null,percent,null,paleoceanography,null,null,N,Thalassiosira antarctica resting spores relative abundance earth science paleoclimate paleoceanography identified diatom,sediment,null,percent,null,paleoceanography,null,null,N,Fragilariopsis curta group (F. curta and Fragilariopsis cylindrus) relative abundance earth science paleoclimate paleoceanography identified diatom,sediment,null,percent,null,paleoceanography,null,null,N,Fragilariopsis curta relative abundance earth science paleoclimate ice cores calcium,bulk ice,null,microgram per liter,null,ice cores,null,null,N,null earth science paleoclimate ice cores sea-salt sodium,bulk ice,null,microgram per liter,null,ice cores,null,null,N,null earth science paleoclimate ice core oxygen isotopes earth science paleoclimate ice core hydrogen isotopes earth science paleoclimate ice core chemistry earth science paleoclimate paleocean population abundance geoscientificInformation 12015 cal yr BP -41 cal yr BP Complete -74.1833 -72.3 159.1833 175.65 -1033 2315 Continent Antarctica Talos Dome TALDICE>LATITUDE -72.8166>LONGITUDE 159.1833 Ocean Southern Ocean Ross Sea BAY05-43c>LATITUDE -74.1833>LONGITUDE 166.05 Ocean Southern Ocean Ross Sea BAY05-20c>LATITUDE -72.3>LONGITUDE 170.05 Ocean Southern Ocean Ross Sea ANTA99-cJ5>LATITUDE -73.8167>LONGITUDE 175.65 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

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Boulder CO 80305-3328 USA online ASCII K. Mezgec, B. Stenni, X. Crosta, V. Masson-Delmotte, C. Baroni, M. Braida, V. Ciardini, E. Colizza, R. Melis, M. C. Salvatore, M. Severi, C. Scarchilli, R. Traversi, R. Udisti, M. Frezzotti 2017 Nature Communications 1334 8 10.1038/s41467-017-01455-x https://www.nature.com/articles/s41467-017-01455-x

The causes of the recent increase in Antarctic sea ice extent, characterised by large regional contrasts and decadal variations, remain unclear. In the Ross Sea, where such a sea ice increase is reported, 50% of the sea ice is produced within wind-sustained latent-heat polynyas. Combining information from marine diatom records and sea salt sodium and water isotope ice core records, we here document contrasting patterns in sea ice variations between coastal and open sea areas in Western Ross Sea over the current interglacial period. Since about 3600 years before present, an increase in the efficiency of regional latent-heat polynyas resulted in more coastal sea ice, while sea ice extent decreased overall. These past changes coincide with remarkable optima or minima in the abundances of penguins, silverfish and seal remains, confirming the high sensitivity of marine ecosystems to environmental and especially coastal sea ice conditions. STUDY NOTES: Holocene water isotope (d18O and dD) and cation (Ca and Na) data from the TALDICE ice core, Antarctica, plus diatom abundance data from 3 Ross Sea marine sediment cores.

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/antarctica/talos/taldice2017chem.txt Formatted Text Data File; TALDICE Ice Core Sodium and Calcium Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/antarctica/talos/taldice2017iso.txt Formatted Text Data File; TALDICE Ice Core dD, d18O, and dexcess Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/mezgec2017/bay05-20cdiatom.txt Formatted Text Data File; Core BAY05-20c Diatom Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/mezgec2017/anta99-cj5diatom.txt Formatted Text Data File; Core ANTA99-cJ5 Diatom Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/mezgec2017/bay05-43cdiatom.txt Formatted Text Data File; Core BAY05-43c Diatom Data USA/NOAA DIF Version 9.8.4 2018-12-11 2018-12-11