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Author |
Sentia Goursaud, Valérie Masson-Delmotte, Vincent Favier, Anaïs Orsi, Martin Werner |
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Title |
Water stable isotope spatio-temporal variability in Antarctica in 1960–2013: observations and simulations from the ECHAM5-wiso atmospheric general circulation model |
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Journal |
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Year |
2018 |
Publication |
Climate of the Past |
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Volume |
14 |
Issue |
6 |
Pages |
923-946 |
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Abstract |
Abstract. Polar ice core water isotope records are commonly used to infer past changes in Antarctic temperature, motivating an improved understanding and quantification of the temporal relationship between δ18O and temperature. This can be achieved using simulations performed by atmospheric general circulation models equipped with water stable isotopes. Here, we evaluate the skills of the high-resolution water-isotope-enabled atmospheric general circulation model ECHAM5-wiso (the European Centre Hamburg Model) nudged to European Centre for Medium-Range Weather Forecasts (ECMWF) reanalysis using simulations covering the period 1960–2013 over the Antarctic continent.
We compare model outputs with field data, first with a focus on regional climate variables and second on water stable isotopes, using our updated dataset of water stable isotope measurements from precipitation, snow, and firn–ice core samples. ECHAM5-wiso simulates a large increase in temperature from 1978 to 1979, possibly caused by a discontinuity in the European Reanalyses (ERA) linked to the assimilation of remote sensing data starting in 1979.
Although some model–data mismatches are observed, the (precipitation minus evaporation) outputs are found to be realistic products for surface mass balance. A warm model bias over central East Antarctica and a cold model bias over coastal regions explain first-order δ18O model biases by too-strong isotopic depletion on coastal areas and underestimated depletion inland. At the second order, despite these biases, ECHAM5-wiso correctly captures the observed spatial patterns of deuterium excess. The results of model–data comparisons for the inter-annual δ18O standard deviation differ when using precipitation or ice core data. Further studies should explore the importance of deposition and post-deposition processes affecting ice core signals and not resolved in the model.
These results build trust in the use of ECHAM5-wiso outputs to investigate the spatial, seasonal, and inter-annual δ18O–temperature relationships. We thus make the first Antarctica-wide synthesis of prior results. First, we show that local spatial or seasonal slopes are not a correct surrogate for inter-annual temporal slopes, leading to the conclusion that the same isotope–temperature slope cannot be applied for the climatic interpretation of Antarctic ice core for all timescales. Finally, we explore the phasing between the seasonal cycles of deuterium excess and δ18O as a source of information on changes in moisture sources affecting the δ18O–temperature relationship. The few available records and ECHAM5-wiso show different phase relationships in coastal, intermediate, and central regions.
This work evaluates the use of the ECHAM5-wiso model as a tool for the investigation of water stable isotopes in Antarctic precipitation and calls for extended studies to improve our understanding of such proxies. |
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411 |
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1814-9324 |
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1814-9324 |
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yes |
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7363 |
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Author |
Lacarra, M., E. Sultan, M.-N. Houssais and G. Williams |
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Title |
Water mass distribution and circulation in the Adélie Depression based on repeated hydrographic surveys on board S/VAstrolabe. |
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Conference - International - Article without Reading Comitee |
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2010 |
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452 |
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yes |
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2694 |
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Author |
Mathieu Casado, Amaelle Landais, Ghislain Picard, Laurent Arnaud, Giuliano Dreossi, Barbara Stenni, Frederic Prié |
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Title |
Water Isotopic Signature of Surface Snow Metamorphism in Antarctica |
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Journal |
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Year |
2021 |
Publication |
Geophysical Research Letters |
Abbreviated Journal |
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Volume |
48 |
Issue |
17 |
Pages |
e2021GL093382 |
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Keywords |
excess Ice cores metamorhism Paleoclimate water isotopes |
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Abstract |
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. |
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1110 |
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1944-8007 |
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yes |
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8306 |
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Author |
Jouzel J., Hoffmann G., Koster R.D. & Masson V. |
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Title |
Water isotopes in precipitation:data/model comparison for present-day and past climates. |
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Journal Article |
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Year |
1999 |
Publication |
Quaternary science reviews |
Abbreviated Journal |
Quat Sci Rev |
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19 |
Issue |
1-5 |
Pages |
363-379 |
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Programme |
909 |
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ISSN |
0277-3791 |
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yes |
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2319 |
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Author |
Lambs Luc, Mangion Perrine, Mougin Eric, Fromard François |
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Title |
Water cycle and salinity dynamics in the mangrove forests of Europa and Juan de Nova Islands, southwest Indian Ocean |
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Journal |
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2016 |
Publication |
Rapid Communications in Mass Spectrometry |
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Volume |
30 |
Issue |
2 |
Pages |
311-320 |
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Rationale The functioning of mangrove forests found on small coralline islands is characterized by limited freshwater inputs. Here, we present data on the water cycling of such systems located on Europa and Juan de Nova Islands, Mozambique Channel. Methods In order to better understand the water cycle and mangrove growth conditions, we have analysed the hydrological and salinity dynamics of the systems by gauge pressure and isotopic tracing (δ18O and δ2H values). Results Both islands have important seawater intrusion as measured by the water level change and the high salinities in the karstic ponds. Europa Island displays higher salinity stress, with its inner lagoon, but presents a pluri?specific mangrove species formation ranging from shrub to forest stands. No freshwater signal could be detected around the mangrove trees. On Juan de Nova Island, the presence of sand and detrital sediment allows the storage of some amount of rainfall to form a brackish groundwater. The mangrove surface area is very limited with only small mono?specific stands being present in karstic depression. Conclusions On the drier Europa Island, the salinity of all the water points is equal to or higher than that of the seawater, and on Juan de Nova the groundwater salinity is lower (5 to 20 PSU). This preliminary study shows that the karstic pothole mangroves exist due to the sea connection through the fractured coral and the high tidal dynamics. Copyright ? 2015 John Wiley & Sons, Ltd. |
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688 |
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0951-4198 |
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0951-4198 |
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yes |
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Serial |
6849 |
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Author |
Luc Lambs, Perrine Mangion, Eric Mougin, François Fromard |
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Title |
Water cycle and salinity dynamics in the mangrove forests of Europa and Juan de Nova Islands, southwest Indian Ocean |
Type |
Journal |
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Year |
2016 |
Publication |
Rapid Communications in Mass Spectrometry |
Abbreviated Journal |
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Volume |
30 |
Issue |
2 |
Pages |
311-320 |
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Abstract |
Rationale The functioning of mangrove forests found on small coralline islands is characterized by limited freshwater inputs. Here, we present data on the water cycling of such systems located on Europa and Juan de Nova Islands, Mozambique Channel. Methods In order to better understand the water cycle and mangrove growth conditions, we have analysed the hydrological and salinity dynamics of the systems by gauge pressure and isotopic tracing (δ18O and δ2H values). Results Both islands have important seawater intrusion as measured by the water level change and the high salinities in the karstic ponds. Europa Island displays higher salinity stress, with its inner lagoon, but presents a pluri-specific mangrove species formation ranging from shrub to forest stands. No freshwater signal could be detected around the mangrove trees. On Juan de Nova Island, the presence of sand and detrital sediment allows the storage of some amount of rainfall to form a brackish groundwater. The mangrove surface area is very limited with only small mono-specific stands being present in karstic depression. Conclusions On the drier Europa Island, the salinity of all the water points is equal to or higher than that of the seawater, and on Juan de Nova the groundwater salinity is lower (5 to 20 PSU). This preliminary study shows that the karstic pothole mangroves exist due to the sea connection through the fractured coral and the high tidal dynamics. Copyright © 2015 John Wiley & Sons, Ltd. |
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688 |
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ISSN |
1097-0231 |
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1097-0231 |
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yes |
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7056 |
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Author |
Engrand C., Deloule E., Hoppe P., Kurat G., Maurette M. & Robert F. |
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Title |
Water contents of micrometeorites from Antarctica. |
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Journal Article |
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Year |
1996 |
Publication |
Lunar and planetary science |
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27 |
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Pages |
337-338 |
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226 |
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Bachelor's thesis |
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1540-7845 |
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yes |
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2071 |
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Author |
Engrand C., Deloule E., Hoppe P., Kurat G., Maurette M. & Robert F. |
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Title |
Water contents of COPS-rich cosmic spherules from Antarctica. |
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Journal Article |
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1996 |
Publication |
Meteoritics |
Abbreviated Journal |
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31 |
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43 |
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226 |
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Bachelor's thesis |
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0026-1114 |
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yes |
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334 |
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Author |
Torsten Wappler, Romain Garrouste, Michael S. Engel, André Nel |
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Title |
Wasp mimicry among Palaeocene reduviid bugs from Svalbard |
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Journal |
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2013 |
Publication |
Acta palaeontologica polonica |
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Volume |
58 |
Issue |
4 |
Pages |
883-887 |
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1005 |
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05677920 |
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yes |
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Serial |
8139 |
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Author |
N. Ribeiro, L. Herraiz-Borreguero, S. R. Rintoul, C. R. McMahon, M. Hindell, R. Harcourt, G. Williams |
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Title |
Warm Modified Circumpolar Deep Water Intrusions Drive Ice Shelf Melt and Inhibit Dense Shelf Water Formation in Vincennes Bay, East Antarctica |
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Journal |
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Year |
2021 |
Publication |
Journal of Geophysical Research: Oceans |
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Volume |
126 |
Issue |
8 |
Pages |
e2020JC016998 |
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Keywords |
AABW Antarctic Coastal Circulation Antarctic Margins basal melt mCDW intrusions seal CTD |
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Abstract |
Antarctic Bottom Water (AABW) production supplies the deep limb of the global overturning circulation and ventilates the deep ocean. While the Weddell and Ross Seas are recognized as key sites for AABW production, additional sources have been discovered in coastal polynya regions around East Antarctica, most recently at Vincennes Bay. Vincennes Bay, despite encompassing two distinct polynya regions, is considered the weakest source, producing Dense Shelf Water (DSW) only just dense enough to contribute to the lighter density classes of AABW found offshore. Here we provide the first detailed oceanographic observations of the continental shelf in Vincennes Bay (104-111°E), using CTD data from instrumented elephant seals spanning from February to November of 2012. We find that Vincennes Bay has East Antarctica’s warmest recorded intrusions of modified Circumpolar Deep Water (mCDW) and that warm mCDW drives basal melt under Vanderford and Underwood ice shelves. Our study also provides the first direct observational evidence for the inflow of meltwater to this region, which increases stratification and hinders DSW formation, and thus AABW production. The Vincennes Bay glaciers, together with the Totten Glacier, drain part of the Aurora Basin, which holds up to 7 m of sea level rise equivalent. Our results highlight the vulnerability of the East Antarctic Ice Sheet to intrusions of mCDW. |
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109 |
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2169-9291 |
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yes |
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8211 |
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