# 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/bay05-20cdiatom.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: BAY05-20c # Location: Ocean>Southern Ocean>Ross Sea # Country: # Northernmost_Latitude: -72.3 # Southernmost_Latitude: -72.3 # Easternmost_Longitude: 170.05 # Westernmost_Longitude: 170.05 # Elevation: -456 m #------------------ # Data_Collection # Collection_Name: BAY05-20cdiatom # Earliest_Year: 4591 # Most_Recent_Year: 135 # Time_Unit: Cal. Year BP # Core_Length: 4.44 m # Notes: Cape Hallett 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.c+c Fragilariopsis curta group (F. curta and Fragilariopsis cylindrus), 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.c+c C.hyal T.ant 1 135 68.32 78.27 3.66 0.00 4 218 64.09 68.23 4.14 0.00 8 242 61.96 66.57 5.76 0.00 12 267 63.22 66.50 4.03 0.00 16 291 45.04 66.86 14.16 0.28 20 315 66.57 74.26 5.03 0.00 24 340 62.17 77.17 3.48 0.00 28 364 45.79 73.16 2.63 0.00 32 388 70.44 81.77 3.31 0.28 36 412 44.96 64.86 10.85 0.00 40 437 47.45 62.47 1.61 0.00 44 461 43.04 72.44 1.84 0.00 48 485 58.84 68.18 4.55 0.00 52 509 61.79 65.85 7.05 0.27 56 534 73.86 78.43 2.03 0.00 60 558 43.17 67.87 5.52 0.00 64 582 50.62 72.32 3.99 0.25 68 607 58.44 66.25 5.54 0.25 72 631 62.5 73.25 2.50 0.00 76 655 48.7 58.50 4.90 0.29 80 679 29.48 57.30 4.68 0.00 84 704 59.68 73.39 3.23 0.00 90 740 60.34 71.51 3.35 0.28 96 777 65.78 67.85 5.90 0.00 100 801 57.65 66.18 6.76 0.00 104 825 72.06 74.67 7.05 0.00 108 849 63.61 71.29 9.41 0.00 112 874 36.75 67.19 10.50 0.00 118 910 60.92 81.15 4.14 0.00 120 922 68.15 79.26 2.96 0.00 124 946 73.4 77.49 6.14 0.26 128 971 48.95 60.26 8.42 0.00 132 995 62.93 69.02 5.61 0.49 136 1019 58.51 67.55 11.17 0.00 140 1044 54.41 62.01 9.07 0.00 144 1068 63.14 66.67 6.23 0.54 148 1088 42.11 51.05 10.79 0.26 152 1102 32.83 39.76 6.93 0.30 156 1116 47.47 63.82 5.99 0.46 160 1130 47.78 53.45 15.52 0.49 164 1144 23.74 51.63 8.61 0.30 168 1157 31.51 42.71 7.55 0.78 172 1171 31.3 51.91 8.14 0.25 176 1185 36.36 40.00 10.13 0.52 180 1199 29.82 40.62 20.31 0.26 184 1213 18.21 21.68 8.67 0.00 188 1227 31.76 41.44 6.98 0.90 192 1240 32.13 40.10 22.95 0.97 196 1254 37.69 40.77 16.41 1.03 200 1268 25.68 32.02 15.71 0.91 204 1282 25.21 31.02 15.51 0.83 208 1296 30.12 34.50 13.16 2.05 212 1310 21.82 39.22 14.29 1.56 216 1323 26.61 34.86 12.84 0.00 220 1337 35.19 40.18 7.92 0.00 224 1351 18.7 60.91 8.50 0.28 228 1365 16.19 52.74 7.05 1.04 232 1379 43.02 53.95 5.81 0.47 236 1393 11.02 34.46 6.50 0.28 240 1407 36.24 42.20 12.39 0.92 244 1457 31.37 37.00 15.55 0.54 248 1520 25.75 71.54 3.25 0.00 252 1582 36.98 47.20 6.08 0.49 256 1645 51.23 56.90 7.64 0.49 260 1708 26.06 55.32 17.02 0.00 264 1770 48.7 60.00 4.93 0.29 268 1833 54.2 74.60 5.67 0.45 272 1896 38.32 71.83 4.31 0.25 274 1927 27.76 41.52 2.21 0.00 278 1990 40.88 43.37 9.12 0.55 282 2052 57.1 70.78 3.75 0.00 284 2084 31.82 48.23 10.86 1.01 288 2147 13.65 28.54 8.68 1.74 290 2178 45.39 49.08 13.36 1.61 292 2209 49.75 52.70 12.50 0.49 296 2272 48.41 53.06 9.29 0.49 300 2335 41.76 52.20 8.24 1.10 304 2397 55.62 66.01 6.46 0.56 308 2460 47.99 50.25 6.78 2.26 310 2491 38.54 40.24 4.63 2.20 312 2523 13.47 41.26 9.74 0.29 316 2585 36.99 38.92 10.32 0.22 320 2648 44.47 57.11 9.21 0.00 324 2711 42.92 63.01 8.90 1.14 328 2773 39.22 53.25 12.73 0.52 332 2836 32.69 37.36 9.89 0.55 336 2899 29.48 49.63 11.06 0.74 340 2961 19.09 61.59 5.91 0.00 344 3024 31.35 39.90 8.29 1.81 348 3087 40.49 56.30 13.58 0.25 352 3149 48.38 51.08 13.51 0.27 356 3212 37.47 47.15 10.92 0.50 360 3275 31.67 47.50 16.39 0.56 364 3337 40.29 46.67 9.28 0.58 368 3400 40.96 57.71 6.38 0.00 372 3463 14.83 63.43 10.23 1.53 374 3494 26.44 66.67 6.03 0.29 378 3557 45.14 56.22 11.35 0.00 380 3588 32.04 37.30 19.68 1.37 384 3651 54.4 62.67 9.07 1.33 388 3714 32.08 41.35 10.78 2.01 392 3776 22.86 31.43 19.37 1.59 396 3839 32.51 38.92 15.52 0.49 400 3902 29.7 40.61 14.55 2.73 404 3964 35.97 49.05 15.26 0.27 408 4027 33.9 38.42 19.49 0.56 412 4090 31.53 44.44 21.32 0.00 416 4152 26.5 37.70 14.48 1.09 420 4215 22.73 39.65 7.83 0.76 424 4278 22.51 44.44 7.31 0.00 428 4340 31.25 44.35 10.42 0.30 432 4403 19.43 50.29 16.00 0.00 436 4466 31.13 39.12 9.37 0.28 440 4528 22.69 36.69 13.73 0.00 444 4591 23.68 33.15 13.93 0.28