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Stenni B, Masson-Delmotte V, Selmo E, Oerter H, Meyer H, Rthlisberger R, Jouzel J, Cattani O, Falourd S, Fischer H, Hoffmann G, Iacumin P, Johnsen SJ, Minster B, Udisti R, . (2010). The deuterium excess records of EPICA Dome C and Dronning Maud Land ice cores (East Antarctica)
. Quat Sci Rev, 29(1-2), 146–159.
Abstract: New high-resolution deuterium excess (d) data from the two EPICA ice cores drilled in Dronning Maud Land (EDML) and Dome C (EDC) are presented here. The main moisture sources for precipitation at EDC and EDML are located in the Indian Ocean and Atlantic Ocean, respectively. The more southward moisture origin for EDML is reflected in a lower present-day d value, compared to EDC. The EDML and EDC isotopic records (δ18O and d) show the main climate features common to the East Antarctic plateau and similar millennial scale climate variability during the last glacial period. However, quite large δ18O and d differences are observed during MIS5.5 and the glacial inception with a long-term behaviour. A possibility for this long-term difference could be related to uncertainties in past accumulation rate which are used in the glaciological models. Regional climate anomalies between the two sites during MIS5.5 could also be consistent with the observed EDML-EDC δ18O and d gradient anomalies. Simulations performed with the General Circulation Model ECHAM4 for different time slices provide a temporal temperature/isotope slope for the EDML region in fair agreement to the modern spatial slope. Tsite and Tsource records are extracted from both ice cores, using a modelling approach, after corrections for past δ18O seawater and elevation changes. A limited impact of d on Antarctic temperature reconstruction at both EDML and EDC has been found with a higher impact only at glacial inception. The AIM (Antarctic Isotope Maximum) events in both ice cores are visible also after the source correction, suggesting that these are real climate features of the glacial period. The different shape of the AIM events between EDC and EDML, as well as some climate features in the early Holocene, points to a slightly different climate evolution at regional scale. A comparison of our temperature reconstruction profiles with the aerosol fluxes show a strong coupling of the nssCa fluxes with Antarctic temperatures during glacial period and a tighter coupling of δ18O and Tsite with ssNa flux at EDML compared to EDC during the glacial period and MIS5.5.
Programme: 458
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. (2008). Insolation and sea level variations during Quaternary interglacial periods: A review of recent results with special emphasis on the last interglaciation
.340(11), 701–710.
Abstract: During the last million years, interglacial periods were characterized by sea level, Antarctic air temperature and atmospheric CO2 concentrations different from those of today. The relationship between CO2 and climate remained rather constant over these intervals, which confirms that CO2 acts as a positive feedback to insolation forcing. The thermohaline circulation and the Atlantic meridional overturning are sources of another strong positive feedback mechanism. They have been responsible for the partial melting of the West Antarctic Ice Sheet during the last interglaciation and for the amplification of the insolation forcing to trigger the last glacial inception.
Programme: 458
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Anais J. Orsi, Kenji Kawamura, Valerie Masson-Delmotte, Xavier Fettweis, Jason E. Box, Dorthe Dahl-Jensen, Gary D. Clow, Amaelle Landais, Jeffrey P. Severinghaus. (2017). The recent warming trend in North Greenland (Vol. 44).
Keywords: borehole temperature Greenland ice sheet surface warming
Programme: 458
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Baroni, M.; Thiemens, M.H.; Delmas, R.J.; Savarino, J. (2007). Mass-Independent Sulfur Isotopic Compositions in Stratospheric Volcanic Eruptions. Science, 315(5808), 84–87.
Abstract: The observed mass-independent sulfur isotopic composition ({Delta}33S) of volcanic sulfate from the Agung (March 1963) and Pinatubo (June 1991) eruptions recorded in the Antarctic snow provides a mechanism for documenting stratospheric events. The sign of {Delta}33S changes over time from an initial positive component to a negative value. {Delta}33S is created during photochemical oxidation of sulfur dioxide to sulfuric acid on a monthly time scale, which indicates a fast process. The reproducibility of the results reveals that {Delta}33S is a reliable tracer to chemically identify atmospheric processes involved during stratospheric volcanism.
Programme: 457;1011
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Savarino, J.; Bekki, S.; Cole-Dai, J.; Thiemens, M.H. (2003). Evidence from sulfate mass independent oxygen isotopic compositions of dramatic changes in atmospheric oxidation following massive volcanic eruptions. J. Geophys. Res., 108.
Abstract: Oxygen isotopic ratio measurements (?17O and ?18O) of background and volcanic sulfate preserved in South Pole snow and ice were used to investigate the impact on the oxidation state of the atmosphere by explosive volcanic eruptions. By comparing different paleovolcanic events, we observe a difference in the SO2 oxidation pathway between moderate (tens of teragrams (Tg) of SO2) and massive (hundreds of Tg) eruptions. Both isotopic data and numerical simulations suggest the shutdown of stratospheric OH chemistry and the opening of unaccounted oxidation channels for SO2, such as the reaction with O(3P) atoms when hundreds of Tg of SO2 are injected into the stratosphere. It is very likely that oxidation rates and pathways and concentrations of most traces gases are also dramatically affected, with potentially important implications for climate forcing.
Programme: 457
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Savarino, J.; Romero, A.; Cole-Dai, J.; Bekki, S.; Thiemens, M.H. (2003). UV induced mass-independent sulfur isotope fractionation in stratospheric volcanic sulfate. Geophysical research letters, 30.
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Baroni, M. Savarino, J. Delmas, R. Thiemens, M. H. (2006). Mass-independent oxygen and sulfur isotopic composition of the Pinatubo and Agung volcanic eruptions as recorded in Dome C snow.
Abstract: EGU General Assembly – Vienna 2006
Programme: 457
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Baroni, M. Savarino, J. Delmas, R. J. Thiemens, M. H. (2005). Mass-Independent sulfur isotope fractionation in sulfates of 9 volcanic events of the last 1000 years in Dome Concordia shallow ice-core.
Abstract: ESF Euroconference, Polar Regions and Quaternary C
Programme: 457
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Morin, S.
Savarino, J.
Bekki, S.
Gong, S.
Bottenheim, J. W. (2006). Pronounced Signature of Arctic Surface Ozone Depletion Events after Polar Sunrise on D17O in Atmospheric Nitrate. Atmospheric chemistry and physics, 6, 6255–6297.
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Savarino, J. Morin, S. Kaiser, J. Thiemens, M. H. (2005). A year-round isotopic survey of aerosol nitrate from a coastal Antarctic station.
Abstract: EOS Trans. AGU, 86
52, Fall Meet. Suppl.
Programme: 457
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