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  • 11
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    Water stable isotope record of ice core WAIS divide (2018)
    PANGAEA
    In:  Supplement to: Steig, Eric J; Ding, Quinghua; White, James W C; Küttel, Meinrad; Rupper, Summer B; Neumann, T A; Neff, Peter D; Gallant, Ailie J E; Mayewski, Paul Andrew; Taylor, Kendrick C; Hoffmann, Georg; Dixon, Daniel A; Schoenemann, Spruce W; Markle, Bradley R; Fudge, Tyler J; Schneider, David P; Schauer, Andrew J; Teel, Rebecca P; Vaughn, Bruce H; Burgener, Landon; Williams, Jessica; Korotkikh, Elena (2013): Recent climate and ice-sheet changes in West Antarctica compared with the past 2,000 years. Nature Geoscience, 6(5), 372-375, https://doi.org/10.1038/NGEO1778
    Details
    Publication Date: 2024-03-18
    Description: Changes in atmospheric circulation over the past five decades have enhanced the wind-driven inflow of warm ocean water onto the Antarctic continental shelf, where it melts ice shelves from below. Atmospheric circulation changes have also caused rapid warming over the West Antarctic Ice Sheet, and contributed to declining sea-ice cover in the adjacent Amundsen-Bellingshausen seas. It is unknown whether these changes are part of a longer-term trend. Here, we use water-isotope (d18O) data from an array of ice-core records to place recent West Antarctic climate changes in the context of the past two millennia. We find that the d18O of West Antarctic precipitation has increased significantly in the past 50 years, in parallel with the trend in temperature, and was probably more elevated during the 1990s than at any other time during the past 200 years. However, d18O anomalies comparable to those of recent decades occur about 1% of the time over the past 2,000 years. General circulation model simulations suggest that recent trends in d18O and climate in West Antarctica cannot be distinguished from decadal variability that originates in the tropics. We conclude that the uncertain trajectory of tropical climate variability represents a significant source of uncertainty in projections of West Antarctic climate and ice-sheet change.
    Keywords: Antarctica, west; DEPTH, ice/snow; ICEDRILL; Ice drill; WAIS_divide; δ18O, water
    Type: Dataset
    Format: text/tab-separated-values, 601 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 12
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    RICE ice core nitrate data for the last glacial period (83-26 ka BP) (2022)
    PANGAEA
    Details
    Publication Date: 2024-06-12
    Description: Roosevelt Island Climate Evolution (RICE) ice core non-sea salt calcium (nssCa) and nitrate (NO3) data, covering last glacial period from 83000-26000 years BP are presented here. RICE is a 764-m long ice core retrieved from Roosevelt Island, a coastal dome in the vicinity of Ross Sea, West Antarctica. Both nssCa and NO3 data are produced using Ion Chromatography (IC) and are of decadal resolution (50-yr averaged). IC measurements were made at National Ice Core facility at GNS Science, New Zealand in 2017 as two batches. The first batch consisted of 579 samples covering the time period between ~40.6-26 ka BP. The second batch had a total of 911 samples and covered ~83-40.6 ka BP. Analytical precision is better than ~5% for Ca and is better than ~10% for NO3. Accuracy is better than ~5 % for Ca and is better than ~30% and ~10% for NO3 in the first batch and second batch, respectively. A likely reason for relatively reduced quality of NO3 measurements in the first batch of samples could be due to the extremely small contamination from drill fluid. The statistical analysis performed using the data includes correlation analysis, change-point analysis etc. In change-point analysis, influence from the outliers were minimized using hampel filter available in MATLAB ( window size=7). Only changepoints with equivalent timing as that in WAIS Divide Ice Core were considered for discussion.
    Keywords: AGE; Antarctica; Calcium, non-sea-salt; Glaciochemistry; ICEDRILL; Ice drill; Ion chromatography; Last glacial period; Nitrate; RICE; RICE ice core; Roosevelt Island, Antarctica; Roosevelt Island Climate Evolution Project
    Type: Dataset
    Format: text/tab-separated-values, 2288 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 13
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    RICE ice core calcium data for the last glacial period (83-26 ka BP) (2022)
    PANGAEA
    Details
    Publication Date: 2024-06-12
    Description: Roosevelt Island Climate Evolution (RICE) ice core calcium (Ca) data, measured using continuous flow analysis (CFA), covering last glacial period 83000-26000 years BP is presented here. RICE is a 764-m long ice core retrieved from Roosevelt Island, a coastal dome in the vicinity of Ross Sea, West Antarctica. The measurements were made at Centre for Ice and Climate, University of Copenhagen, Denmark in 2015 and posses annual resolution. A three-point calibration was used for the measurements.
    Keywords: AGE; Antarctica; Calcium; CFA; Continuous Flow Analysis; Glaciochemistry; ICEDRILL; Ice drill; Last glacial period; RICE; RICE ice core; Roosevelt Island, Antarctica; Roosevelt Island Climate Evolution Project
    Type: Dataset
    Format: text/tab-separated-values, 40859 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 14
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    Stable oxygen isotopes of Antarctic snow pits (2006)
    PANGAEA
    In:  Supplement to: Bertler, Nancy A; Naish, Tim R; Oerter, Hans; Kipfstuhl, Sepp; Barrett, Peter J; Mayewski, Paul Andrew; Kreutz, Karl (2006): The Effects of joint ENSO – Antarctic Oscillation Forcing on the McMurdo Dry Valleys, Antarctica. Antarctic Science, 18(4), 507-514, https://doi.org/10.1017/S0954102006000551
    Details
    Publication Date: 2024-06-29
    Description: Stable oxygen analyses and snow accumulation rates from snow pits sampled in the McMurdo Dry Valleys have been used to reconstruct variations in summer temperature and moisture availability over the last four decades. The temperature data show a common interannual variability, with strong regional warmings occurring especially in 1984/85, 1995/96 and 1990/91 and profound coolings during 1977/78, 1983/84, 1988/89, 1993/94, and 1996/97. Annual snow accumulation shows a larger variance between sites, but the early 1970s, 1984, 1997, and to a lesser degree 1990/91 are characterized overall by wetter conditions, while the early and late 1980s show low snow accumulation values. Comparison of the reconstructed and measured summer temperatures with the Southern Oscillation Index (SOI) and the Antarctic Oscillation (AAO) yield statistically significant correlations, which improve when phase-relationships are considered. A distinct change in the phase relationship of the correlation is observed, with the SOI-AAO leading over the temperature records by one year before, and lagging by one year after 1988. These results suggest that over the last two decades summer temperatures are influenced by opposing El Niño Southern Oscillation and AAO forcings and support previous studies that identified a change in the Tropical-Antarctic teleconnection between the 1980s and 1990s.
    Keywords: Baldwin_Valley_Glacier; BVG; McMurdo Dry Valleys, southern Victorica Land, Antarctica; NewZealand_Antarctic_Expedition; Polar_Plateau; PP; Scott Base; SNOWPIT; Snow pit; Victoria_Lower_Glacier; VLG_II; Wilson_Piedmont_Glacier; WPG
    Type: Dataset
    Format: application/zip, 4 datasets
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 15
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    Stable oxygen isotopes of snow pit Victoria_Lower_Glacier (2006)
    PANGAEA
    Details
    Publication Date: 2024-06-29
    Keywords: DEPTH, ice/snow; Mass spectrometer Finnigan Delta-S; McMurdo Dry Valleys, southern Victorica Land, Antarctica; NewZealand_Antarctic_Expedition; Sample ID; Scott Base; SNOWPIT; Snow pit; Victoria_Lower_Glacier; VLG_II; δ18O, water
    Type: Dataset
    Format: text/tab-separated-values, 185 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 16
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    Stable oxygen isotopes of snow pit Polar_Plateau (2006)
    PANGAEA
    Details
    Publication Date: 2024-06-29
    Keywords: DEPTH, ice/snow; Mass spectrometer Finnigan Delta-S; McMurdo Dry Valleys, southern Victorica Land, Antarctica; NewZealand_Antarctic_Expedition; Polar_Plateau; PP; Sample ID; Scott Base; SNOWPIT; Snow pit; δ18O, water
    Type: Dataset
    Format: text/tab-separated-values, 359 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 17
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    Stable oxygen isotopes of snow pit Baldwin_Valley_Glacier (2006)
    PANGAEA
    Details
    Publication Date: 2024-06-29
    Keywords: Baldwin_Valley_Glacier; BVG; DEPTH, ice/snow; Mass spectrometer Finnigan Delta-S; McMurdo Dry Valleys, southern Victorica Land, Antarctica; NewZealand_Antarctic_Expedition; Sample ID; Scott Base; SNOWPIT; Snow pit; δ18O, water
    Type: Dataset
    Format: text/tab-separated-values, 846 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 18
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    Stable oxygen isotopes of snow pit Wilson_Piedmont_Glacier (2006)
    PANGAEA
    Details
    Publication Date: 2024-06-29
    Keywords: DEPTH, ice/snow; Mass spectrometer Finnigan Delta-S; McMurdo Dry Valleys, southern Victorica Land, Antarctica; NewZealand_Antarctic_Expedition; Sample ID; Scott Base; SNOWPIT; Snow pit; Wilson_Piedmont_Glacier; WPG; δ18O, water
    Type: Dataset
    Format: text/tab-separated-values, 566 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
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