# Patriot Hills, West Antarctica 135,000 Year Blue Ice Isotope 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/28610 # Description: NOAA Landing Page # Online_Resource: https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/antarctica/patriot/patriot2020iso.txt # Description: NOAA location of the template # # Original_Source_URL: # Description: # # Description/Documentation lines begin with # # Data lines have no # # # Archive: Ice Core # # Dataset DOI: # # Parameter_Keywords: oxygen isotopes, hydrogen isotopes #-------------------- # Contribution_Date # Date: 2020-01-22 #-------------------- # File_Last_Modified_Date # Date: 2020-01-22 #-------------------- # Title # Study_Name: Patriot Hills, West Antarctica 135,000 Year Blue Ice Isotope Data #-------------------- # Investigators # Investigators: Turney, C.S.M.; Fogwill, C.J. #-------------------- # Description_Notes_and_Keywords # Description: Isotope data (d18O and dD) from Patriot Hills blue ice, Ellsworth Mountains, Antarctica, as a proxy for West Antarctic ice mass loss during the Last Interglacial. # Provided Keywords: Last Interglacial, Eemian, Antarctic Ice Sheets, Blue Ice Area (BIA), Climate-Carbon Feedbacks, Marine Ice-Sheet Instability (MISI), Paleoclimatology, Paris Climate Agreement, Polar Amplification, Tephrochronology #-------------------- # Publication # Authors: Chris S.M. Turney, Christopher J. Fogwill, Nicholas R. Golledge, Nicholas P. McKay, Erik van Sebille, Richard T. Jones, David Etheridge, Mauro Rubino, David P. Thornton, Siwan M. Davies, Christopher Bronk Ramsey, Zoë A. Thomas, Michael I. Bird, Niels C. Munksgaard, Mika Kohno, John Woodward, Kate Winter, Laura S. Weyrich, Camilla M. Rootes, Helen Millman, Paul G. Albert, Andres Rivera, Tas van Ommen, Mark Curran, Andrew Moy, Stefan Rahmstorf, Kenji Kawamura, Claus-Dieter Hillenbrand, Michael E. Weber, Christina J. Manning, Jennifer Young, and Alan Cooper # Published_Date_or_Year: 2020-02-11 # Published_Title: Early Last Interglacial ocean warming drove substantial ice mass loss from Antarctica # Journal_Name: Proceedings of the National Academy of Sciences # Volume: # Edition: # Issue: # Pages: # Report_Number: # DOI: 10.1073/pnas.1902469117 # Online_Resource: https://www.pnas.org/content/early/2020/02/10/1902469117 # Full_Citation: # Abstract: The future response of the Antarctic ice sheet to rising temperatures remains highly uncertain. A useful period for assessing the sensitivity of Antarctica to warming is the Last Interglacial (LIG) (129 to 116 ky), which experienced warmer polar temperatures and higher global mean sea level (GMSL) (+6 to 9 m) relative to present day. LIG sea level cannot be fully explained by Greenland Ice Sheet melt (~2 m), ocean thermal expansion, and melting mountain glaciers (~1 m), suggesting substantial Antarctic mass loss was initiated by warming of Southern Ocean waters, resulting from a weakening Atlantic meridional overturning circulation in response to North Atlantic surface freshening. Here, we report a blue-ice record of ice sheet and environmental change from the Weddell Sea Embayment at the periphery of the marine-based West Antarctic Ice Sheet (WAIS), which is underlain by major methane hydrate reserves. Constrained by a widespread volcanic horizon and supported by ancient microbial DNA analyses, we provide evidence for substantial mass loss across the Weddell Sea Embayment during the LIG, most likely driven by ocean warming and associated with destabilization of subglacial hydrates. Ice sheet modeling supports this interpretation and suggests that millennial-scale warming of the Southern Ocean could have triggered a multimeter rise in global sea levels. Our data indicate that Antarctica is highly vulnerable to projected increases in ocean temperatures and may drive ice-climate feedbacks that further amplify warming. #------------------ # Funding_Agency # Funding_Agency_Name: Australian Research Council # Grant: FL140100260, FT120100004, LP120200724 #------------------ # Funding_Agency # Funding_Agency_Name: JSPS and MEXT KAKENHI  # Grant: 15KK0027, 17H06320 #------------------ # Site_Information # Site_Name: Patriot Hills Blue Ice # Location: Antarctica # Country: # Northernmost_Latitude: -80.3 # Southernmost_Latitude: -80.3 # Easternmost_Longitude: -81.35 # Westernmost_Longitude: -81.35 # Elevation: 800 m #------------------ # Data_Collection # Collection_Name: Patriot2020iso # Earliest_Year: 135000 # Most_Recent_Year: 1000 # Time_Unit: Cal. Year BP # Core_Length: 1556 m # Notes: PH2015 #------------------ # Chronology_Information # Chronology: # # Distance, m (relative to datum) Bayesian cal yrs BP (1sd) # 1192.9 1270±540 # 992.8 1650±410 # 792.8 2040±350 # 692.4 2230±370 # 593.9 2420±400 # 495.2 2610±460 # 394.8 2800±540 # 385.8 2820±550 # 376.1 2840±550 # 366 2860±560 # 356.8 10,620±370 # 336.8 12,350±370 # 315.5 14,280±350 # 306 15,220±420 # 296 16,270±420 # 286 17,380±520 # 282 17,850±580 # 279 18,260±750 # 266.1 20,030±1660 # 246.2 22,770±2750 # 195.2 28,450±1890 # 190 29,010±1830 # 93.7 37,520±950 # 10 44,930±320 # 5 45,420±430 # -105.7 56,470±2460 # -205.6 66,690±4410 # -305.7 76,750±6130 # -340 130,310±1740 # #---------------- # 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) # ## dist_m distance, , , meters, , ice core, , ,N, Distance along transect of blue ice ## d18O delta 18O, ice, , per mil, , Ice cores, , ,N, ## d2H delta 2H, ice, , per mil, , Ice cores, , ,N, ## d2Hex delta 2H excess, ice, , per mil, , Ice cores, , ,N, # #---------------- # Data: # Data lines follow (have no #) # Data line format - tab-delimited text, variable short name as header # Missing Values: # dist_m d18O d2H d2Hex -356 -40.50646798 -321.8479585 2.203785 -355 -40.991461 -322.923223 5.008465 -354 -31.61033813 -246.9981217 5.884583 -353 -31.010418 -240.865948 7.217396 -352 -38.392302 -301.548157 5.590259 -351 -31.2648646 -245.4291754 4.689741 -350 -29.359666 -228.124575 6.752753 -349 -39.82121 -312.796715 5.772965 -348 -36.7943469 -290.4913935 3.863382 -347 -38.12977 -299.358939 5.679221 -346 -39.274834 -308.964058 5.234614 -345 -31.96586532 -250.4050178 5.321905 -344 -39.110146 -309.11956 3.761608 -343 -36.440268 -287.117609 4.404535 -342 -31.3919365 -244.9748718 6.160620 -341 -34.30393 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