GISP2-D Temperature

REFERENCES:

Clow, G.D., R.W. Saltus, and E.D. Waddington. 1996. A new high-precision
borehole-temperature logging system used at GISP2, Greenland, and Taylor
Dome, Antarctica. Journal of Glaciology 42:576-584.

Clow, G.D., R.W. Saltus, and E.D. Waddington. 1995. High-precision
temperature logging at GISP2, Greenland, May 1992. U.S. Geological Survey
Open File Report 95-490.

Cuffey, K.M., G.D. Clow, R.B. Alley, M. Stuiver, E.D. Waddington, and R.W.
Saltus. 1995. Large Arctic temperature change at the Wisconsin-Holocene
glacial transition. Science 270:455-458.

Gundestrup, N.S., H.B. Clausen, and B.L. Hansen. 1994. The UCPH borehole
logger. Mem. National Institute Polar Research, Special Issue 49:224-233.

Saltus, R.W., and G.D. Clow. 1994. Deconvolution of continuous borehole
temperature logs: Example from the Greenland GISP2 icecore hole. U.S.
Geological Survey Open File Report 94-254.

DATA DESCRIPTION:

Several temperature logs and fixed-depth temperature experiments were
conducted in the 3-km borehole (GISP-D) at the GISP2 site during 1994,
1995, and 1996.  These experiments were conducted using the U.S.
Geological Survey's temperature logging system (Clow et al., 1996; Clow
and Gundestrup, 1997).  The sample spacing for the primary temperature
logs is about 20 cm while the accuracy of the temperature measurements is
estimated to be 4.5 mK. 
 
However, the temperature logs must be deconvolved to account for the
finite response time of the temperature probe, corrected for the thermal
disturbance caused by the drilling process, and corrected for the effects
of fluid convection within the borehole.  As of this time (SEP 1996), we
are still developing the fluid convection and drilling disturbance
corrections. 

The following "uncorrected" data were obtained on 14 June, 1995.  Although
the quality is insufficient for borehole thermometry studies, it is
probably adequate for many other studies (e.g. constraining ice dynamics
models).  The fully processed data will become available at a later date. 

=============================================================		
	parameter	units	
------------------------------------------------------------------		
TVD	true vertical depth	m	
T 	temperature	deg C	
=============================================================		

DATA:


TVD	T	
100	-31.4	
200	-31.4	
300	-31.2	
400	-31.1
500	-31
600	-31
700	-31
800	-31.1
900	-31.2
1000	-31.4
1100	-31.6
1200	-31.7
1300	-31.9
1400	-32
1500	-32.1
1600	-32
1700	-31.8
1800	-31.4
1900	-30.8
2000	-30
2100	-28.9
2200	-27.5
2300	-25.9
2400	-24.1
2500	-22.1
2600	-19.9
2700	-17.6
2800	-15.2
2900	-12.8
3000	-10.3
3048	-9.2