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  • 1
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    Water Isotopic Signature of Surface Snow Metamorphism in Antarctica (2021)
    Details
    Publication Date: 2022-04-01
    Description: Water isotope ratios of ice cores are a key source of information on past temperatures. Through fractionation within the hydrological cycle, temperature is imprinted in the water isotopic composition of snowfalls. However, this signal of climatic interest is modified after deposition when snow remains at the surface exposed to the atmosphere. Comparing time series of surface snow isotopic composition at Dome C with satellite observations of surface snow metamorphism, we found that long summer periods without precipitation favor surface snow metamorphism altering the surface snow isotopic composition. Using excess parameters (combining D,17O, and 18O fractions) allow the identification of this alteration caused by sublimation and condensation of surface hoar. The combined measurement of all three isotopic compositions could help identifying ice core sections influenced by snow metamorphism in sites with very low snow accumulation.
    Description: Plain Language Summary: Water isotopes in ice core records are often used to reconstruct past climate temperature variations. Classically, the temperature signal is thought to be imprinted in water isotopes of precipitation, and then archived in the ice core as it falls, and in cold areas of Antarctica, piles up for very long period. Here, we show that the surface snow isotopic composition varies in between precipitation events, suggesting that there might be more than one contribution to the isotopic signal in ice core records. This is particularly important for low accumulation sites, where the snow at the surface remains exposed for very long time periods. The combined use of several isotopic ratios in surface snow helps us disentangle the processes that create this signal.
    Description: Key Points: During summer without precipitation, intense snow metamorphism shows a strong water isotopic signature. During summer without precipitation, intense snow metamorphism shows a strong water isotopic signature. The d‐excess and 17O‐excess of the snow is a proxy of snow metamorphism for low accumulation regions.
    Description: FP7 Ideas: European Research Council (FP7 Ideas) http://dx.doi.org/10.13039/100011199
    Description: Foundation Prince Albert of Monaco
    Description: Alexander von Humboldt‐Stiftung (Humboldt‐Stiftung) http://dx.doi.org/10.13039/100005156
    Description: DFG project CLIMAIC
    Description: https://doi.pangaea.de/10.1594/PANGAEA.934273
    Keywords: ddc:551.31 ; ddc:551.9
    Language: English
    Type: doc-type:article
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    CITATION GEO-LEO
  • 2
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    Sub-millennial climate variability from high-resolution water isotopes in the EPICA Dome C ice core (2022)
    Copernicus Publications
    In:  EPIC3Climate of the Past, Copernicus Publications, 18(10), pp. 2289-2301, ISSN: 1814-9324
    Details
    Publication Date: 2023-10-19
    Description: The EPICA Dome C (EDC) ice core provides the longest continuous climatic record, covering the last 800 000 years (800 kyr). A unique opportunity to investigate decadal to millennial variability during past glacial and interglacial periods is provided by the high-resolution water isotopic record (δ18O and δD) available for the EDC ice core. We present here a continuous compilation of the EDC water isotopic record at a sample resolution of 11 cm, which consists of 27000 δ18O measurements and 7920 δD measurements (covering, respectively, 94 % and 27 % of the whole EDC record), including published and new measurements (2900 for both δ18O and δD) for the last 800kyr. Here, we demonstrate that repeated water isotope measurements of the same EDC samples from different depth intervals obtained using different analytical methods are comparable within analytical uncertainty. We thus combine all available EDC water isotope measurements to generate a high-resolution (11 cm) dataset for the past 800 kyr. A frequency decomposition of the most complete δ18O record and a simple assessment of the possible influence of diffusion on the measured profile shows that the variability at the multidecadal to multi-centennial timescale is higher during glacial than during interglacial periods and higher during early interglacial isotopic maxima than during the Holocene. This analysis shows as well that during interglacial periods characterized by a temperature optimum at the beginning, the multi-centennial variability is strongest over this temperature optimum.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , peerRev
    Format: application/pdf
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    PAPER (OA)
  • 3
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    Abrupt excursions in water vapor isotopic variability at the Pointe Benedicte observatory on Amsterdam Island (2024)
    Copernicus Publications
    In:  EPIC3Atmospheric Chemistry and Physics, Copernicus Publications, 24(8), pp. 4611-4634, ISSN: 1680-7316
    Details
    Publication Date: 2024-05-21
    Description: In order to complement the picture of the atmospheric water cycle in the Southern Ocean, we have continuously monitored water vapor isotopes since January 2020 on Amsterdam Island in the Indian Ocean. We present here the first 2-year long water vapor isotopic record at this site. We show that the water vapor isotopic composition largely follows the water vapor mixing ratio, as expected in marine boundary layers. However, we detect 11 periods of a few days where there is a strong loss of correlation between water vapor δ18O and water vapor mixing ratio as well as abrupt negative excursions of water vapor δ18O. These excursions often occur toward the end of precipitation events. Six of these events show a decrease in gaseous elemental mercury, suggesting subsidence of air from a higher altitude. Our study aims to further explore the mechanism driving these negative excursions in water vapor δ18O. We used two different models to provide a data–model comparison over this 2-year period. While the European Centre Hamburg model (ECHAM6-wiso) at 0.9° was able to reproduce most of the sharp negative water vapor δ18O excursions, hence validating the physics process and isotopic implementation in this model, the Laboratoire de Météorologie Dynamique Zoom model (LMDZ-iso) at 2° (3°) resolution was only able to reproduce seven (one) of the negative excursions, highlighting the possible influence of the model resolution for the study of such abrupt isotopic events. Based on our detailed model–data comparison, we conclude that the most plausible explanations for such isotopic excursions are rain–vapor interactions associated with subsidence at the rear of a precipitation event.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
    Format: application/pdf
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    PAPER (OA)
  • 4
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    From atmospheric water isotopes measurement to firn core interpretation in Adélie Land: a case study for isotope-enabled atmospheric models in Antarctica (2023)
    Copernicus Publications
    In:  EPIC3The Cryosphere, Copernicus Publications, 17(12), pp. 5241-5254, ISSN: 1994-0416
    Details
    Publication Date: 2024-05-21
    Description: In a context of global warming and sea level rise acceleration, it is key to estimate the evolution of the atmo- spheric hydrological cycle and temperature in polar regions, which directly influence the surface mass balance of the Arc- tic and Antarctic ice sheets. Direct observations are available from satellite data for the last 40 years and a few weather data since the 1950s in Antarctica. One of the best ways to access longer records is to use climate proxies in firn or ice cores. The water isotopic composition in these cores is widely used to reconstruct past temperature variations. We need to progress in our understanding of the influence of the atmospheric hydrological cycle on the water isotopic composition of ice cores. First, we present a 2-year-long time series of vapor and precipitation isotopic composition mea- surement at Dumont d’Urville Station, in Adélie Land. We characterize diurnal variations of meteorological parameters (temperature, atmospheric water mixing ratio (hereafter hu- midity) and δ18O) for the different seasons and determine the evolution of key relationships (δ18O versus temperature or humidity) throughout the year: we find that the temper- ature vs. δ18O relationship is dependent on synoptic events dynamics in winter contrary to summer. Then, this data set is used to evaluate the atmospheric general circulation model ECHAM6-wiso (model version with embedded water stable isotopes) in a coastal region of Adélie Land where local con- ditions are controlled by strong katabatic winds which directly impact the isotopic signal. We show that a combina- tion of continental (79 %) and oceanic (21 %) grid cells leads model outputs (temperature, humidity and δ18O) to nicely fit the observations, at different timescales (i.e., seasonal to syn- optic). Therefore we demonstrate the added value of long- term water vapor isotopic composition records for model evaluation. Then, as a clear link is found between the isotopic compo- sition of water vapor and precipitation, we assess how iso- topic models can help interpret short firn cores. In fact, a virtual firn core built from ECHAM-wiso outputs explains much more of the variability observed in S1C1 isotopic record than a virtual firn core built from temperature only. Yet, deposition and post-deposition effects strongly affect the firn isotopic signal and probably account for most of the re- maining misfits between archived firn signal and virtual firn core based on atmospheric modeling.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
    Format: application/pdf
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    PAPER (OA)
  • 5
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    Isotopic composition of surface snow at Dome C, Antarctica in 2013-2018 (2021)
    PANGAEA
    Details
    Publication Date: 2023-07-19
    Keywords: DATE/TIME; DEPTH, ice/snow; Deuterium excess; Dome C; DomeC_SurfNIVO; Dome C, Antarctica; Infrared spectrometer Picarro L2130, L2140; Mass spectrometer MAT253; Oxygen-17 excess; SNOW; Snow/ice sample; δ18O, water
    Type: Dataset
    Format: text/tab-separated-values, 883 data points
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    DATA PANGAEA
  • 6
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    Δ17O of O2 during Termination II and Termination V from EPICA Dome C ice core and reconstruction of global oxygen biosphere productivity over the last 445 ka based on D17O of O2 measurements (2020)
    PANGAEA
    Details
    Publication Date: 2023-07-19
    Description: Significant changes in atmospheric CO2 over glacial-interglacial cycles have mainly been attributed to the Southern Ocean through physical and biological processes. However, little is known about the contribution of global biosphere productivity, associated with important CO2 fluxes. Here we present the first high resolution record of Δ17O of O2 in the Antarctic EPICA Dome C ice core over Termination V and Marine Isotopic Stage (MIS) 11 and reconstruct the global oxygen biosphere productivity over the last 445 ka.
    Keywords: EDC; EPICA; European Project for Ice Coring in Antarctica; global oxygen biosphere productivity; Δ17O of O2
    Type: Dataset
    Format: application/zip, 2 datasets
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    DATA PANGAEA
  • 7
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    Reconstruction of the global oxygen biosphere productivity based on Δ17O of O2 measurements from Vostok, GISP2 and EDC ice cores over the last 450 ka (2020)
    PANGAEA
    Details
    Publication Date: 2023-07-19
    Description: Reconstruction of the global oxygen biosphere productivity over the last 445 ka based on measurements of Δ17O of O2 in Vostok, GISP2 and Epica Dome C ice cores and new correction factors compared to the previous record of Blunier et al., 2012
    Keywords: AGE; AICC2012; Antarctica; Antarctic ice core chronology; Biosphere productivity, maximum; Biosphere productivity, minimum; Calculated; Dome C; Dome C, Antarctica; DRILL; Drilling/drill rig; EDC; EPICA; EPICA Dome C; European Project for Ice Coring in Antarctica; GISP; GISP2; global oxygen biosphere productivity; Ice_core_diverse; ICEDRILL; Ice drill; Sampling/drilling ice; Vostok; Δ17O of O2
    Type: Dataset
    Format: text/tab-separated-values, 4444 data points
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    DATA PANGAEA
  • 8
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    Δ17O of O2 during Termination II and Termination V from EPICA Dome C ice core (2020)
    PANGAEA
    Details
    Publication Date: 2023-07-19
    Description: High resolution record of the triple isotopic composition of atmospheric oxygen (Δ17O of O2) in the Antarctic EPICA Dome C ice core over Termination II (153.62 to 124.46 ka), Termination V and Marine Isotopic Stage 11 (444.1 to 405.7 ka)
    Keywords: AGE; AICC2012; Antarctic ice core chronology; DEPTH, ice/snow; Dome C; Dome C, Antarctica; EDC; EPICA; EPICA Dome C; European Project for Ice Coring in Antarctica; global oxygen biosphere productivity; ICEDRILL; Ice drill; Δ17O; Δ17O of O2
    Type: Dataset
    Format: text/tab-separated-values, 89 data points
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    DATA PANGAEA
  • 9
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    Grain index of surface snow at Dome C, Antarctica in 1998-2016 (2021)
    PANGAEA
    Details
    Publication Date: 2024-01-15
    Keywords: DATE/TIME; Dome C; DomeC_GI; Dome C, Antarctica; Grain index, snow; SAT; Satellite measurements; Satellite remote sensing
    Type: Dataset
    Format: text/tab-separated-values, 6152 data points
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    DATA PANGAEA
  • 10
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    Surface snow triple isotopic composition at Dome C, Antarctica (2021)
    PANGAEA
    Details
    Publication Date: 2024-01-15
    Description: Water isotope ratios of ice cores are a key source of information on past temperatures. Throughout the hydrological cycle, temperature is imprinted in the water isotopic composition of snowfalls. However, this signal of climatic interest is modified after deposition when snow remains at the surface exposed to the atmosphere. Comparing time series of surface snow isotopic composition at Dome C with satellite observations of surface snow metamorphism, we found that long summer periods without precipitation favour surface snow metamorphism altering the surface snow isotopic composition. Using excess parameters (combining D,17O, and 18O fractions) allow the identification of this alteration caused by sublimation and condensation of surface hoar. The combined measurement of all three isotopic compositions could help identifying ice core sections influenced by snow metamorphism in sites with very low snow accumulation.
    Keywords: Antarctica; COMBINISO; excess; metamorphism; Quantitative picture of interactions between climate, hydrological cycle and stratospheric inputs in Antarctica over the last 100 years via the combined use of all water isotopes; surface snow; water isotopes
    Type: Dataset
    Format: application/zip, 9 datasets
    Location Call Number Limitation Availability
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    DATA PANGAEA
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