Climate variability along latitudinal and longitudinal transects in East Antarctica

Olivier Magand, Massimo Frezzotti, Michel Pourchet, Barbara Stenni, Laura Genoni, Michel Fily

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33 Citations (Scopus)

Abstract

In the framework of the International Trans-Antarctic Scientific Expedition (ITASE) programme, France and Italy carried out a traverse along one west-east and two north-south transects in East Antarctica from November 2001 to January 2002. Eighteen shallow snow-firn cores were drilled, and surface snow samples were collected every 5 km along the traverse. Firn temperatures were measured in boreholes down to 30 m. The cores were analyzed for β radioactivity to obtain snow accumulation-rate data. The surface snow samples were analyzed for δ18O to correlate isotopic values with borehole temperatures. Multiple regression analysis shows a global near-dry-adiabatic lapse rate and a latitudinal lapse rate of 1.05°C (° lat. S)-1, in the Dome C drainage area. Analysis of firn temperatures reveals a super-adiabatic lapse rate along the ice divide between Talos Dome and the Southern Ocean coast, and in some sectors along the ice divide between the Astrolabe Basin and D59. Snow accumulation rates and firn temperatures show warmer temperatures and higher accumulation values close to the ice divides extending from Talos Dome and Dome C to the Southern Ocean. The spatial pattern of data is linked with a katabatic-wind-source basin and moisture-source region.
Original languageEnglish
Pages (from-to)351 - 358
Number of pages8
JournalAnnals of Glaciology
Volume39
Publication statusPublished - 2004
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Earth-Surface Processes

Cite this

Magand, O., Frezzotti, M., Pourchet, M., Stenni, B., Genoni, L., & Fily, M. (2004). Climate variability along latitudinal and longitudinal transects in East Antarctica. Annals of Glaciology, 39, 351 - 358.