# Antarctic Holocene Ice and Sediment Core Isotope, Chemical, and Diatom Data #----------------------------------------------------------------------- # World Data Service for Paleoclimatology, Boulder # and # NOAA Paleoclimatology Program # National Centers for Environmental Information (NCEI) #----------------------------------------------------------------------- # Template Version 3.0 # Encoding: UTF-8 # NOTE: Please cite Publication, and Online_Resource and date accessed when using these data. # If there is no publication information, please cite Investigators, Title, and Online_Resource and date accessed. # # Online_Resource: https://www.ncdc.noaa.gov/paleo/study/22590 # Description: NOAA Landing Page # Online_Resource: https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/mezgec2017/anta99cj5diatom.txt # Description: NOAA location of the template # # Original_Source_URL: # Description: # # Description/Documentation lines begin with # # Data lines have no # # # Archive: Paleoceanography # # Dataset DOI: # # Parameter_Keywords: population abundance #-------------------- # Contribution_Date # Date: 2017-11-06 #-------------------- # File_Last_Modified_Date # Date: 2017-11-06 #-------------------- # Title # Study_Name: Antarctic Holocene Ice and Sediment Core Isotope, Chemical, and Diatom Data #-------------------- # Investigators # Investigators: 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. #-------------------- # Description_Notes_and_Keywords # Description: 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. #-------------------- # Publication # Authors: 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 # Published_Date_or_Year: 2017-11-06 # Published_Title: Holocene sea ice variability driven by wind and polynya efficiency in the Ross Sea # Journal_Name: Nature Communications # Volume: 8 # Edition: 1334 # Issue: # Pages: # Report_Number: # DOI: 10.1038/s41467-017-01455-x # Online_Resource: https://www.nature.com/articles/s41467-017-01455-x # Full_Citation: # Abstract: 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. #------------------ # Funding_Agency # Funding_Agency_Name: PNRA-MIUR # Grant: #------------------ # Site_Information # Site_Name: ANTA99-cJ5 # Location: Ocean>Southern Ocean>Ross Sea # Country: # Northernmost_Latitude: -73.8167 # Southernmost_Latitude: -73.8167 # Easternmost_Longitude: 175.65 # Westernmost_Longitude: 175.65 # Elevation: -598 m #------------------ # Data_Collection # Collection_Name: ANTA99-cJ5diatom # Earliest_Year: 11807 # Most_Recent_Year: 1014 # Time_Unit: Cal. Year BP # Core_Length: 2.41 m # Notes: Joides Basin core #------------------ # Chronology_Information # Chronology: # The age models of the marine cores are based on calibrated 14C dates performed on acid insoluble organic matter, # using the correction for regional marine reservoir effect and the local dead carbon contamination and its down-core extrapolation, # the chronologies are detailed in the Methods and Supplementary. #---------------- # Variables # # Data variables follow are preceded by "##" in columns one and two. # Data line variables format: one per line, shortname-tab-variable components (what, material, error, units, seasonality, data type,detail, method, C or N for Character or Numeric data, free text) # ## depth_cm depth, , , cm, , , top depth, ,N, ## age_calBP age, , , calendar years before present, , , , ,N, ## F.curta Fragilariopsis curta, sediment, , percent, , paleoceanography, relative abundance, ,N, ## F.kerg Fragilariopsis kerguelensis, sediment, , percent, , paleoceanography, relative abundance, ,N, ## C.hyal Chaetoceros Hyalochaete resting spores, sediment, , percent, , paleoceanography, relative abundance, ,N, ## T.ant Thalassiosira antarctica resting spores, sediment, , percent, , paleoceanography, relative abundance, ,N, # #---------------- # Data: # Data lines follow (have no #) # Data line format - tab-delimited text, variable short name as header # Missing Values: # depth_cm age_calBP F.curta F.kerg C.hyal T.ant 1 1014 17.47 1.81 19.88 2.11 2 1038 12.92 1.55 18.35 3.62 4 1085 17.8 2.54 18.93 3.95 8 1180 14.42 2.56 32.37 5.45 12 1276 19.7 1.82 19.09 3.03 16 1371 19.88 3.80 26.32 4.09 20 1466 16.47 2.40 29.64 4.19 24 1561 18.51 3.28 28.66 5.37 28 1656 18.81 3.45 26.02 4.39 32 1752 15.76 3.33 23.94 5.45 36 1847 22.06 2.58 20.34 5.73 40 1942 24.77 3.41 20.74 4.33 44 2037 24.62 1.80 18.62 2.10 48 2132 17.34 3.18 26.01 2.89 52 2228 19.13 0.55 33.33 3.01 56 2323 20.91 1.82 22.12 1.82 60 2426 26.49 0.54 24.05 2.97 64 2583 18.6 2.13 29.57 1.22 68 2740 18.65 3.22 30.55 1.93 72 2896 19.7 0.91 26.06 2.12 76 3053 17.39 1.74 24.93 2.61 80 3210 19.62 3.54 19.07 1.63 84 3367 13.13 0.90 29.25 3.58 88 3524 18.11 3.06 25.35 1.95 92 3681 23.74 0.84 20.11 4.19 96 3838 23.14 1.14 26.00 2.86 100 3995 18.29 2.06 25.96 1.77 104 4152 23.45 1.13 24.58 2.26 108 4309 24.4 1.51 21.69 3.01 112 4466 18.31 0.58 25.58 2.33 116 4623 16.33 2.58 25.79 3.15 120 4780 26.69 0.59 28.74 1.47 124 4937 22.42 2.95 12.68 2.06 128 5094 27.81 0.28 31.46 1.69 132 5251 26.35 1.27 28.57 0.63 136 5408 20.33 0.56 26.18 3.90 140 5575 15.41 3.32 28.70 6.04 142 5695 15.83 0.72 28.54 4.08 144 5815 22.94 0.61 34.56 3.36 146 5934 21.44 1.75 25.16 6.13 148 6054 20.23 1.16 38.44 4.91 150 6174 19.43 0.22 27.15 5.96 152 6294 17.26 2.19 37.26 4.93 154 6414 15.01 0.69 31.87 7.39 156 6534 19.66 0.28 40.46 4.27 158 6654 15.46 1.00 23.94 12.72 160 6773 17.07 0.91 36.89 6.10 162 6893 20.72 0.77 37.34 3.07 164 7013 16.62 2.04 38.19 8.75 168 7253 14.61 0.56 44.10 4.78 172 7492 15.98 0.55 52.62 3.58 176 7732 15.16 1.94 49.35 4.52 180 7972 13.6 0.80 51.73 2.67 184 8211 9.89 0.44 69.45 1.76 188 8451 9.92 1.34 58.18 2.14 192 8691 8.11 1.66 72.56 1.87 196 8931 5.68 5.68 66.76 4.83 200 9170 4.47 2.15 76.16 1.66 204 9410 3.58 6.18 71.87 0.98 208 9650 4.52 5.97 71.61 1.61 212 9889 4.76 8.84 68.71 1.53 216 10129 9.94 8.92 55.38 1.83 220 10369 2.61 7.82 72.96 2.12 224 10608 2.36 17.70 53.98 2.06 228 10848 4.68 11.70 54.68 1.17 232 11088 3.41 12.78 62.22 1.70 236 11327 5.03 15.08 48.60 3.07 240 11567 7.14 13.52 49.49 1.28 244 11807 5.21 12.27 66.56 2.45