Dynamics of the Scharffenbergbotnen blue ice area, Dronning Maud Land, Antarctica

A Sinisalo; Aslak Grinsted; J Moore

Dynamics of the Scharffenbergbotnen blue ice area, Dronning Maud Land, Antarctica

A Sinisalo, Aslak Grinsted, J Moore

9 Citationer (Scopus)

Abstract

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.

Originalsprog	Engelsk
Tidsskrift	Annals of Glaciology
Vol/bind	39
Udgave nummer	1
Sider (fra-til)	417-422
Antal sider	6
ISSN	0260-3055
Status	Udgivet - 2004
Udgivet eksternt	Ja

Citationsformater

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title = "Dynamics of the Scharffenbergbotnen blue ice area, Dronning Maud Land, Antarctica",

abstract = "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.",

author = "A Sinisalo and Aslak Grinsted and J Moore",

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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

SN - 0260-3055

VL - 39

SP - 417

EP - 422

JO - Annals of Glaciology

JF - Annals of Glaciology

IS - 1

ER -

Dynamics of the Scharffenbergbotnen blue ice area, Dronning Maud Land, Antarctica

Abstract

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