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RAE 35 : Some notes from the 1993-4 field season at Vostok station

RAE 35 : Some notes from the 1993-4 field season at Vostok station. San Petersburg 2013. Jean Robert Petit Laboratoire de Glaciologie et de Géophysique de l’Environnement (LGGE) Centre National de la Recherche Scientifique (CNRS) University J. Fourrier

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RAE 35 : Some notes from the 1993-4 field season at Vostok station

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  1. RAE 35 : Some notes from the 1993-4 field season at Vostok station San Petersburg 2013 • Jean Robert Petit • Laboratoire de Glaciologie et de Géophysique de l’Environnement (LGGE) • Centre National de la Recherche Scientifique (CNRS) • University J. Fourrier • 38402 St Martin d’Hères cedex , France

  2. 1984 1984 1991

  3. 1992-3 1992-3 field season 1991-2 1993-4

  4. 5G bore hole Koudriashov et al.

  5. Chronology of events • Winter 1991 : (Kracilev A. ) • 5G drilling thermal drill. • 1991-2 : 5G got stuck at 2503 m depth • Drilling fluid density deficit leads to probable hole closure • Project for setting a casing and for the use CFC 141b • Winter 1992 (Moussiev B.) • Hole deviation at 2200 m depth : 5G1 • 1992-3 : Setting geophysical winch and labs • Winter 1993 (Tchistiakov V. K.) • Drilling 5G1 down to 2755 m depth • 1993-4 : Setting the casing and attempt to rise drilling fluid to the top. • Fluid penetrated into the ice and come back. • ?

  6. Vostok 5G hole 1993-4 field season 1 2 4 5 3 2m 42 m 100 m 120m 160m 230m

  7. 6 bars air pressure 6 9 6 8 7 90m

  8. Notes from the 1993-4 field season • -when filling hole, fluid level cannot be set above 42m depth • -when an air pressure is applied, fluid level went well below casing end and close off depth of the ice (>130m) • When pressure is removed, fluid come back into the hole • Conclusion : • no leak through the casing • fluid level cannot be risen • fluid penetrated into the ice through the ice wall and can come back • Possible hydro fracturing in the brittle zone

  9. Thank you!

  10. Snow temperature recorders (TAUTO) : preliminary data and comparison with ERA San Petersburg 2013 • L. Arnaud1, G.Picard1,V. Lipenkov2, E. Lefebvre1, J.R. Petit1 • 1-LGGE, CNRS- University J Fourrier, St Martin d’Hères Cedex, France2- AARI, St Petersbourg, Russia

  11. Scientific background -Improve knowledge of densification processes (one amongst ideas of J.M. Barnola) -heat, water vapour transfers, firn ageing (diffusion properties, density, stable isotope…) Provide « field truth » or constraints for remote sensing measurements (microwaves domain) Compare with Réanalysis (ERA) -Set up of temperature grapes Dome C (since ~ 2008..) Vostok (since Jan. 2010): 27000 hours S2 (since Jan. 2011)

  12. Winter game: Remove the frost… Data collection from flash memory to computer (RAE 56, RAE 57)

  13. Daily variation Winter warming waves

  14. summerr Warm events (8 day gaussian filter)

  15. Vostok 2012

  16. Vostok 2012

  17. Vostok record 2010 2011 2012

  18. Thank you!

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