rae 35 : some notes from the 1993-4 field season at vostok station
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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 - PowerPoint PPT PresentationTRANSCRIPT
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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
San Petersburg 2013
RAE 35 : Some notes from the 1993-4 field season at Vostok station
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19841984
1991
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1992-3 field season
1991-2
1992-3
1993-4
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5G bore hole
Koudriashov et al.
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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. - ?
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2m
42 m
100 m
120m
160m
Vostok 5G hole1993-4 field season
1 2 3 4 5
230m
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6
6 bars air pressure
90m
6 7 8 9
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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
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Thank you!
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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
San Petersburg 2013
Snow temperature recorders (TAUTO) : preliminary data and comparison with ERA
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-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 grapesDome C (since ~ 2008..)Vostok (since Jan. 2010): 27000 hoursS2 (since Jan. 2011)
Scientific background
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Depth (cm)
0
5
10
15
20
30
40
50
60
80
100
140
200
500
1000
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Data collection from flash memory to computer (RAE 56, RAE 57)
Winter game:
Remove the frost…
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Daily variation
Winter warming waves
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summerr
Warm events(8 day gaussian filter)
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Vostok 2012
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Vostok 2012
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2010 2011 2012
Vostok record
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Thank you!