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The NorthGRIP deep drilling programme

  • Dorthe Dahl-Jensen (a1), Niels S. Gundestrup (a1), Heinz Miller (a2), Okitsugu Watanabe (a3), Sigfús J. Johnsen (a1), Jørgen P. Steffensen (a1), Henrik B. Clausen (a1), Anders Svensson (a1) and Lars B. Larsen (a1)...
Abstract
Abstract

The North Greenland Icecore Project (NorthGRIP) was initiated in 1995 as a joint international programme involving Denmark, Germany, Japan, Belgium, Sweden, Iceland, the U.S.A., France and Switzerland. the main goal was to obtain undisturbed high-resolution information about the Eemian climatic period (115–130 kyr BP). the records from the Greenland Icecore Project (GRIP) and Greenland Ice Sheet Project 2 (GISP2) in central Greenland are different and disturbed down in the ice covering this period. Internal radio-echo sounding layers show that NorthGRIP, placed 325 km north-northwest of GRIP at the Summit of the Greenland ice sheet, is located on a gently sloping ice ridge with very flat bedrock and internal layers found so high that an undisturbed Eemian record is possible. Internal layers much farther above bedrock than their apparent counter parts at GRIP suggest that conditions are favourable for recovery of an undisturbed Eemian record. So far, a 1351 mdeep ice core (NorthGRIP1) and a 3001 mdeep ice core (NorthGRIP 2) have been recovered. the ice thickness is expected to be 3080 m, and the ice temperature at 3001 m is –5.6°C, so we expect basal melting at the bedrock. Most of the Eemian ice will be melted away, leaving only the last part and the transition between the Eem and the Last Glacial Period. At 3001 m the age of the ice is 110 kyr BP and the annual layers are of the order 1 cm.With modern methods the annual layers can be resolved, resulting in detailed information on the decline of the warm Eemian period into the Last Glacial Period.

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References
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Alley R. B., Gow A. J., Johnsen S. J., Kipfstuhl J., Meese D. A. and Thorsteinsson Th.. 1995. Comparison of deep ice cores. Nature , 373(6513), 393394.
Bolzan J. F. and Strobel M.. 1994. Accumulation-rate variations around Summit, Greenland. J. Glaciol. , 40(134), 5666.
Chuah T. S., Gogineni S. P., Allen C. and Wohletz B.. 1996a. Radar thickness measurements over the northern part of the Greenland ice sheet. Lawrence, KS, University of Kansas Center for Research Inc. Radar Systems and Remote Sensing Laboratory. (Technical Report 10470-3.)
Chuah T. S., Gogineni S. P., Allen C. and Wohletz B.. 1996b. Radar thickness measurements over the southern part of the Greenland ice sheet. Lawrence, KS, University of Kansas Center for Research Inc. Radar Systems and Remote Sensing Laboratory. (Technical Report 10470-2.)
Clausen H. B., Gundestrup N. S., Johnsen S. J., Bindschadler R. and Zwally J.. 1988. Glaciological investigations in the Crête area, central Greenland: a search for a new deep-drilling site. Ann. Glaciol. , 10,1015.
Cuffey K.M. and Marshall S. J..2000. Substantial contribution to sea-level rise during the last interglacial from the Greenland ice sheet. Nature , 404(6778), 591593.
Dahl-Jensen D. and 9 others. 1997. A search in north Greenland for a new ice-core drill site. J. Glaciol. , 43(144), 300306.
Dansgaard W. and 10 others. 1993. Evidence for general instability of past climate from a 250-kyr ice-core record. Nature , 364(6434), 218220.
Fahnestock M., Bindschadler R., Kwok R. and Jezek K.. 1993. Greenland ice sheet surface properties and ice dynamics from ERS-1 SAR imagery. Science , 262(5139),15301534.
Fischer H. and 7 others. 1998. Little Ice Age clearly recorded in northern Greenland ice cores. Geophys. Res. Lett. , 25(10),17491752.
Friedmann A., Moore J.C., Thorsteinsson T., Kipfstuhl J. and Fischer H.. 1995. A 1200 year record of accumulation from northern Greenland. Ann. Glaciol. , 21,1925.
Gogineni S., Chuah T., Allen C., Jezek K. and Moore R. K.. 1998. An improved coherent radar depth sounder. J. Glaciol. , 44(148), 659669.
Grinsted A. and Dahl-Jensen D.. 2002. A Monte Carlo tuned model of the flow in the NorthGRIP area. Ann. Glaciol., 35 (see paper in this volume).
Grootes P.M. and Stuiver M.. 1997. 18O/16O variability in Greenland snow and ice with 10–3 to 105 year time resolution. J. Geophys. Res. , 102(C12), 26,455–26,470.
Gundestrup N. S., Johnsen S. J., Journé P. and Schwander J.. 1996. The EPICA deep ice core drill. In Hempel G., ed. the ocean and the poles: grand challenges for European cooperation. Stuttgart, Gustav Fischer Verlag, 279287.
Gundestrup N. S., Johnsen S. J., Hansen S. B., Shoji H., Talalay P. and Wilhelms F.. 2002. Sticking deep ice core drills. Why and how to recover. Natl. Inst. Polar Res. Mem., Special Issue 56,181195.
Hvidberg C. S., Keller K. and Gundestrup N. S.. 2002. Mass balance and ice movement along the north-northwest ridge of the Greenland ice sheet at NorthGRIP. Ann. Glaciol. , 35 (see paper in this volume).
Johnsen S. J. and 14 others. 1997. The δ18O record along the Greenland Ice Core Project deep ice core and the problem of possible Eemian climatic instability. J. Geophys. Res. , 102(C12), 26,397–26,410.
Koerner R.M., Bourgeois J.C. and Fisher D. A.. 1988. Pollen analysis and discussion of time-scales in Canadian ice cores. Ann. Glaciol. , 10, 8591.
Röthlisberger R. and 10 others. 2002. Nitrate in Greenland and Antarctic ice cores: a detailed description of post-depositional processes. Ann. Glaciol. , 35 (see paper in this volume).
Ruth U., Wagenbach D., Bigler M., Steffensen J. P., Röthlisberger R. and Miller H.. 2002. High resolution microparticle profiles at NorthGRIP: case studies of the calcium–dust relationship. Ann. Glaciol. , 35 (see paper in this volume).
Siggaard-Andersen M.-L., Steffensen J. P. and Fischer H.. 2002. Lithium in Greenland ice cores measured by ion chromatography. Ann. Glaciol. , 35 (see paper in this volume).
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Annals of Glaciology
  • ISSN: 0260-3055
  • EISSN: 1727-5644
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