A Monte Carlo-tuned model of the flow in the NorthGRIP area
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A Monte Carlo-tuned model of the flow in the NorthGRIP area. / Grinsted, Aslak; Dahl-Jensen, Dorthe.
I: Annals of Glaciology, Bind 35, Nr. 1, 2002, s. 527-530.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - A Monte Carlo-tuned model of the flow in the NorthGRIP area
AU - Grinsted, Aslak
AU - Dahl-Jensen, Dorthe
N1 - Paper id:: 10.3189/172756402781817130
PY - 2002
Y1 - 2002
N2 - The North Greenland Icecore Project (NorthGRIP) drill site was chosenin order to obtain a good Eemian record. At the present depth, 3001m, the Eemian interstadialhas yet to be seen. Clearly the flow in this area is poorly understood and needsfurther investigation. After a review of specific features of the bottom topography, it isbelieved that the geology changes along the flowline. In order to investigate whether thisexplains the observed age-depth relationship at NorthGRIP, the inverse Monte Carlomethod has been applied to a simple model.The inversion reveals that the main reason noEemian is observed is a high basal melt rate (2.7mm/a). The melting is a consequence of ahigher geothermal heat flux than the expected 51mW/m^2 of the Precambrian shield. Fromour analyses it is concluded that the geothermal heat flux at NorthGRIP is 98mW/m^2.Thehigh basalmelt rate also gives rise to sliding at the bed. In addition to these results, an accumulationmodelhas been established specifically forNorthGRIP.These results are essentialfor further modelling of the NorthGRIP flow and depth-age relationship
AB - The North Greenland Icecore Project (NorthGRIP) drill site was chosenin order to obtain a good Eemian record. At the present depth, 3001m, the Eemian interstadialhas yet to be seen. Clearly the flow in this area is poorly understood and needsfurther investigation. After a review of specific features of the bottom topography, it isbelieved that the geology changes along the flowline. In order to investigate whether thisexplains the observed age-depth relationship at NorthGRIP, the inverse Monte Carlomethod has been applied to a simple model.The inversion reveals that the main reason noEemian is observed is a high basal melt rate (2.7mm/a). The melting is a consequence of ahigher geothermal heat flux than the expected 51mW/m^2 of the Precambrian shield. Fromour analyses it is concluded that the geothermal heat flux at NorthGRIP is 98mW/m^2.Thehigh basalmelt rate also gives rise to sliding at the bed. In addition to these results, an accumulationmodelhas been established specifically forNorthGRIP.These results are essentialfor further modelling of the NorthGRIP flow and depth-age relationship
U2 - 10.3189/172756402781817130
DO - 10.3189/172756402781817130
M3 - Journal article
VL - 35
SP - 527
EP - 530
JO - Annals of Glaciology
JF - Annals of Glaciology
SN - 0260-3055
IS - 1
ER -
ID: 126256