Frezzotti M

Publications (2)0 Total impact

• Source

  Available from: Maurine Montagnat

  Article: TALDICE-1 age scale of the Talos Dome deep ice core, East Antarctica

  Buiron D, Chappellaz J, Stenni B, Frezzotti M, Baumgartner M, Capron E, Landais A, Lemieux-Dudon B, Masson-Delmotte V, Montagnat M, Parrenin F, Schilt A
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  ABSTRACT: A new deep ice core drilling, TALDICE, has been successfully handled by a European team at Talos Dome, in the Ross Sea sector of East Antarctica, down to 1620 m depth. Using stratigraphic markers and a new inverse method, we produce the first official chronology of the ice core, called TALDICE-1. We show that it notably improves an a priori chronology resulting from a one-dimensional ice flow model, and that it is in agreement with a posteriori controls of the resulting accumulation rate and thinning function along the core. An absolute uncertainty of only 300 yr is obtained in the course of the last deglaciation. This uncertainty remains lower than 600 yr over Marine Isotope Stage 3, back to 50 kyr BP. The phasing of the TALDICE ice core climate record with respect to the central East Antarctic plateau and Greenland records can thus be determined with a precision allowing for a discussion of the mechanisms at work at sub-millennial time scales.
  Climate of the Past Discussions. 01/2010;
• Source

  Available from: Hans Oerter

  Article: A comparison of the present and last interglacial periods in six Antarctic ice cores

  Masson-Delmotte V, Buiron D, Ekaykin A, Frezzotti M, Gallée H, Jouzel J, Krinner G, Landais A, Motoyama H, Oerter H, Pol K, Pollard D, Ritz C, Schlosser E, L. C. Sime, Sodemann H, Stenni B, Uemura R, Vimeux F
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  ABSTRACT: We compare the present and last interglacial periods as recorded in Antarctic water stable isotope records now available at various temporal resolutions from six East Antarctic ice cores: Vostok, Taylor Dome, EPICA Dome C (EDC), EPICA Dronning Maud Land (EDML), Dome Fuji and the recent TALDICE ice core from Talos Dome. We first review the different modern site characteristics in terms of ice flow, meteorological conditions, precipitation intermittency and moisture origin, as depicted by meteorological data, atmospheric reanalyses and Lagrangian moisture source diagnostics. These different factors can indeed alter the relationships between temperature and water stable isotopes. Using five records with sufficient resolution on the EDC3 age scale, common features are quantified through principal component analyses. Consistent with instrumental records and atmospheric model results, the ice core data depict rather coherent and homogenous patterns in East Antarctica during the last two interglacials. Across the East Antarctic plateau, regional differences, with respect to the common East Antarctic signal, appear to have similar patterns during the current and last interglacials. We identify two abrupt shifts in isotopic records during glacial inception at TALDICE and EDML, likely caused by regional sea ice expansion. These regional differences are discussed in terms of moisture origin and in terms of past changes in local elevation histories which are compared to ice sheet model results. Our results suggest that, for coastal sites, elevation changes may contribute significantly to inter-site differences. These elevation changes may be underestimated by current ice sheet models.
  Climate of the Past Discussions. 01/2010;