Dynamics of the Scharffenbergbotnen blue ice area, Dronning Maud Land, Antarctica
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Dynamics of the Scharffenbergbotnen blue ice area, Dronning Maud Land, Antarctica. / Sinisalo, A; Grinsted, Aslak; Moore, J.
I: Annals of Glaciology, Bind 39, Nr. 1, 2004, s. 417-422.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - Dynamics of the Scharffenbergbotnen blue ice area, Dronning Maud Land, Antarctica
AU - Sinisalo, A
AU - Grinsted, Aslak
AU - Moore, J
N1 - Paper id:: 10.3189/172756404781814177
PY - 2004
Y1 - 2004
N2 - Ground-penetrating radar (GPR) surveys in Scharffenbergbotnen valley, Dronning Maud Land, Antarctica, complement earlier, relatively sparse data on the ice-flow dynamics and mass-balance distribution of the area. The negative net surface mass balance in the valley appears to be balanced by the inflow. The flow regime in Scharffenbergbotnen defines four separate mass-balance areas, and about 60 times more ice enters the valley from the northwestern entrance than via the narrow western gate. We formalize and compare three methods of determining both the surface age gradient of the blue ice and the dip angles of isochrones in the firn/blue-ice transition zone: observed and dated radar internal reflections, a geometrical model of isochrones, and output from a flowline model. The geometrical analysis provides generally applicable relationships between ice surface velocity and surface age gradient or isochrone dip angle.
AB - Ground-penetrating radar (GPR) surveys in Scharffenbergbotnen valley, Dronning Maud Land, Antarctica, complement earlier, relatively sparse data on the ice-flow dynamics and mass-balance distribution of the area. The negative net surface mass balance in the valley appears to be balanced by the inflow. The flow regime in Scharffenbergbotnen defines four separate mass-balance areas, and about 60 times more ice enters the valley from the northwestern entrance than via the narrow western gate. We formalize and compare three methods of determining both the surface age gradient of the blue ice and the dip angles of isochrones in the firn/blue-ice transition zone: observed and dated radar internal reflections, a geometrical model of isochrones, and output from a flowline model. The geometrical analysis provides generally applicable relationships between ice surface velocity and surface age gradient or isochrone dip angle.
M3 - Journal article
VL - 39
SP - 417
EP - 422
JO - Annals of Glaciology
JF - Annals of Glaciology
SN - 0260-3055
IS - 1
ER -
ID: 9832681