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  • 1
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    17O-excess at Vostok indicates stratospheric input [Earth, Atmospheric, and Planetary Sciences] (2013)
    National Academy of Sciences
    Details
    Publication Date: 2013-10-30
    Description: Combined measurements of water isotopologues of a snow pit at Vostok over the past 60 y reveal a unique signature that cannot be explained only by climatic features as usually done. Comparisons of the data using a general circulation model and a simpler isotopic distillation model reveal a stratospheric signature...
    Keywords: Chemistry and Applications in Nature of Mass Independent Isotope Effects Special Feature
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
    Published by National Academy of Sciences
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    PAPER CURRENT
  • 2
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    Telomeres and chromosomal instability in chronic lymphocytic leukemia (2013)
    Nature Publishing Group (NPG)
    In: Leukemia
    Details
    Publication Date: 2013-02-07
    Description: Telomeres and chromosomal instability in chronic lymphocytic leukemia Leukemia 27, 490 (February 2013). doi:10.1038/leu.2012.194 Authors: L Véronèse, O Tournilhac, M Callanan, N Prie, F Kwiatkowski, P Combes, M Chauvet, F Davi, L Gouas, P Verrelle, R Guièze, P Vago, J O Bay & A Tchirkov
    Print ISSN: 0887-6924
    Electronic ISSN: 1476-5551
    Topics: Medicine
    Published by Nature Publishing Group (NPG)
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    PAPER CURRENT
  • 3
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    δ¹⁸Oatm records between 100-800 ka from EPICA Dome C ice core (2018)
    PANGAEA
    Details
    Publication Date: 2023-11-11
    Keywords: AGE; DEPTH, ice/snow; DomeC; DRILL; Drilling/drill rig; EPICA; European Project for Ice Coring in Antarctica; δ18O, atmospheric
    Type: Dataset
    Format: text/tab-separated-values, 999 data points
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    DATA PANGAEA
  • 4
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    δ¹⁸Oatm and dO2/N2 records between 100-800 ka from EPICA Dome C ice core on AICC2012 chronology (2018)
    PANGAEA
    In:  Supplement to: Extier, Thomas; Landais, Amaëlle; Bréant, Camille; Prié, F; Bazin, Lucie; Dreyfus, Gabrielle; Roche, Didier M; Leuenberger, Markus Christian (2018): On the use of d18O atm for ice core dating. Quaternary Science Reviews, 185, 244-257, https://doi.org/10.1016/j.quascirev.2018.02.008
    Details
    Publication Date: 2023-11-11
    Description: Deep ice core chronologies have been improved over the past years through the addition of new age constraints. However, dating methods are still associated with large uncertainties for ice cores from the East Antarctic plateau where layer counting is not possible. Indeed, an uncertainty up to 6 ka is associated with AICC2012 chronology of EPICA Dome C (EDC) ice core, which mostly arises from uncertainty on the delay between changes recorded in d18Oatm and in June 21st insolation variations at 65°N used for ice core orbital dating. Consequently, we need to enhance the knowledge of this delay to improve ice core chronologies. We present new high-resolution EDC d18Oatm record (153-374 ka) and dO2/N2 measurements (163-332 ka) performed on well-stored ice to provide continuous records of d18Oatm and dO2/N2 between 100 and 800 ka. The comparison of d18Oatm with the d18Ocalcite from East Asian speleothems shows that both signals present similar orbital and millennial variabilities, which may represent shifts in the InterTropical Convergence Zone position, themselves associated with Heinrich events. We thus propose to use the d18Ocalcite as target for d18Oatm orbital dating. Such a tuning method improves the ice core chronology of the last glacial inception compared to AICC2012 by reconciling NGRIP and mid-latitude climatic records. It is especially marked during Dansgaard-Oeschger 25 where the proposed chronology is 2.2 ka older than AICC2012. This d18Oatm - d18Ocalcite alignment method applied between 100 and 640 ka improves the EDC ice core chronology, especially over MIS 11, and leads to lower ice age uncertainties compared to AICC2012.
    Keywords: DomeC; DRILL; Drilling/drill rig; EPICA; European Project for Ice Coring in Antarctica
    Type: Dataset
    Format: application/zip, 2 datasets
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    DATA PANGAEA
  • 5
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    dO2/N2 records between 100-800 ka from EPICA Dome C ice core (2018)
    PANGAEA
    Details
    Publication Date: 2023-11-11
    Keywords: AGE; DEPTH, ice/snow; DomeC; DRILL; Drilling/drill rig; EPICA; European Project for Ice Coring in Antarctica; δ Oxygen/Nitrogen ratio
    Type: Dataset
    Format: text/tab-separated-values, 325 data points
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    DATA PANGAEA
  • 6
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    What controls the isotopic composition of Greenland surface snow? (2014)
    COPERNICUS GESELLSCHAFT MBH
    In:  EPIC3Climate of the Past, COPERNICUS GESELLSCHAFT MBH, 10(1), pp. 377-392, ISSN: 1814-9332
    Details
    Publication Date: 2016-11-14
    Description: Water stable isotopes in Greenland ice core data provide key paleoclimatic information, and have been compared with precipitation isotopic composition simulated by isotopically enabled atmospheric models. However, post-depositional processes linked with snow metamorphism remain poorly documented. For this purpose, monitoring of the isotopic composition (δ18O, δD) of near-surface water vapor, precipitation and samples of the top (0.5 cm) snow surface has been conducted during two summers (2011–2012) at NEEM, NW Greenland. The samples also include a subset of 17O-excess measurements over 4 days, and the measurements span the 2012 Greenland heat wave. Our observations are consistent with calculations assuming isotopic equilibrium between surface snow and water vapor. We observe a strong correlation between near-surface vapor δ18O and air temperature (0.85 ± 0.11‰ °C−1 (R = 0.76) for 2012). The correlation with air temperature is not observed in precipitation data or surface snow data. Deuterium excess (d-excess) is strongly anti-correlated with δ18O with a stronger slope for vapor than for precipitation and snow surface data. During nine 1–5-day periods between precipitation events, our data demonstrate parallel changes of δ18O and d-excess in surface snow and near-surface vapor. The changes in δ18O of the vapor are similar or larger than those of the snow δ18O. It is estimated using the CROCUS snow model that 6 to 20% of the surface snow mass is exchanged with the atmosphere. In our data, the sign of surface snow isotopic changes is not related to the sign or magnitude of sublimation or deposition. Comparisons with atmospheric models show that day-to-day variations in near-surface vapor isotopic composition are driven by synoptic variations and changes in air mass trajectories and distillation histories. We suggest that, in between precipitation events, changes in the surface snow isotopic composition are driven by these changes in near-surface vapor isotopic composition. This is consistent with an estimated 60% mass turnover of surface snow per day driven by snow recrystallization processes under NEEM summer surface snow temperature gradients. Our findings have implications for ice core data interpretation and model–data comparisons, and call for further process studies.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
    Format: application/pdf
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  • 7
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    Eemian interglacial reconstructed from a Greenland folded ice core (2013)
    Nature Publishing Group
    In:  EPIC3Nature, Nature Publishing Group, 493(7433), pp. 489-494, ISSN: 0028-0836
    Details
    Publication Date: 2017-10-18
    Description: Efforts to extract a Greenland ice core with a complete record of the Eemian interglacial (130,000 to 115,000 years ago) have until now been unsuccessful. The response of the Greenland ice sheet to the warmer-than-present climate of the Eemian has thus remained unclear. Here we present the new North Greenland Eemian Ice Drilling (‘NEEM’) ice core and show only a modest ice-sheet response to the strong warming in the early Eemian. We reconstructed the Eemian record from folded ice using globally homogeneous parameters known from dated Greenland and Antarctic ice-core records. On the basis of water stable isotopes, NEEM surface temperatures after the onset of the Eemian (126,000 years ago) peaked at 8 ± 4 degrees Celsius above the mean of the past millennium, followed by a gradual cooling that was probably driven by the decreasing summer insolation. Between 128,000 and 122,000 years ago, the thickness of the northwest Greenland ice sheet decreased by 400 ± 250 metres, reaching surface elevations 122,000 years ago of 130 ± 300 metres lower than the present. Extensive surface melt occurred at the NEEM site during the Eemian, a phenomenon witnessed when melt layers formed again at NEEM during the exceptional heat of July 2012. With additional warming, surface melt might become more common in the future.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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  • 8
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    New developments in laser spectroscopy for water vapor isotopic measurement along the Dumont-d’Urville – Dome C transect (2023)
    In:  XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
    Details
    Publication Date: 2023-06-28
    Description: Water isotopes measurements in polar ice cores are key to reconstruct past climatic variations. However, the relationship between surface temperature and water isotopic composition is not straightforward because snow isotopic composition is influenced by many factors in addition to local temperature of condensation (evaporation origin, trajectory of moist air, post deposition effects). In order to refine this interpretation, parallel observation of water vapor and surface snow isotopic composition in polar regions is essential. Measuring atmospheric water isotopic composition is however an important challenge, especially in dry places like the East Antarctic plateau, where water mixing ratio can be as low as 10 ppmv. Laser spectrometers based on the cavity ring-down spectroscopy (CRDS), commonly used for field measurement, fail to precisely measure water vapor isotopic composition for the lower range of water mixing ratios recorded in East Antarctica.The optical feedback cavity enhanced absorption spectroscopy (OF-CEAS) technique offers an interesting alternative for low humidity detection. During the austral summer 2022 – 2023, two OF-CEAS spectrometers were respectively installed at Dumont-d’Urville, situated along the coast, and Dome C, situated on the plateau, at 3230 m above sea level. We present here results obtained with this OF-CEAS technique, which shows an improved limit of detection, while keeping a low humidity dependence.This work is part of the AWACA ERC project, in which we intend to install several OF-CEAS instruments, in three remote sites situated along the Dumont-d’Urville – Dome C transect, in addition to the two permanent polar stations.
    Language: English
    Type: info:eu-repo/semantics/conferenceObject
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  • 9
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    Water vapor isotopic composition measurements at Dome C, East Antarctica, from 2018 to today: Isotopic signature of moisture intrusions (2023)
    In:  XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
    Details
    Publication Date: 2023-06-28
    Description: Dome C is located on the high Antarctic plateau, at 3233m above sea level, and 1200km away from the coastline. At this location, the EPICA ice core was retrieved from the ice sheet and allowed the reconstruction of past climatic information 800,000 years back in time. Amongst several atmospheric parameters, the past local temperature was inferred from the stable water isotope record measured in the ice.To interpret this record, it is necessary to understand how it was formed in such a dry and cold environment. This includes understanding the water cycle dynamics in Antarctica, from evaporation to precipitation and moisture pathways, as well as the processes affecting the record after deposition of the precipitation, such as snow-atmosphere exchanges.During the austral summer 2018-2019, a Picarro laser spectrometer was installed on site to monitor continuously the isotopic composition of the atmosphere. It provided measurements for all austral summers since then and allowed the detection of two major atmospheric river events, including a rare event during the onset of the cold Antarctic winter. To go beyond the limitations of the Picarro instrument when measuring at very low humidity levels, as encountered during the wintertime at Dome C, a new laser spectrometer dedicated to low humidity measurements has been developed and installed it in parallel to the Picarro instrument during the summer season 2022-2023. Here we present the results of the atmospheric isotopic composition during four consecutive austral summers and the comparison of the two laser instruments during the most recent period.
    Language: English
    Type: info:eu-repo/semantics/conferenceObject
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  • 10
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    Towards an understanding of the controls on δO2/N2 variability in ice core records (2023)
    In:  XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
    Details
    Publication Date: 2023-07-12
    Description: Processes controlling pore closure are broadly understood yet defining the physical mechanisms driving elemental fractionation remains ambiguous. It has indeed been shown that the pore closure processes lead to a decrease of concentration of small size molecules (e.g. O2, Ar, Ne) in the bubbles. Moreover, ice core δO2/N2 records shows a clear link with local summer solstice insolation and hence makes it a powerful dating tool. However, investigations towards a mechanistic understanding of δO2/N2 and summer solstice insolation suggests local climatic conditions may also be important. We compiled δO2/N2records from several polar ice cores and found a link between δO2/N2 and temperature and/or accumulation rate, in addition to the influence of the summer solstice insolation intensity. Using the Crocus snowpack model, we carry out sensitivity tests to identify the response of near-surface snow properties to changes in insolation, accumulation rate and air temperature.
    Language: English
    Type: info:eu-repo/semantics/conferenceObject
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