Dating Antarctic blue ice areas using a novel ice flow model

Aslak Grinsted; J Moore; V B Spikes; A Sinisalo

Dating Antarctic blue ice areas using a novel ice flow model

Aslak Grinsted, J Moore, V B Spikes, A Sinisalo

20 Citations (Scopus)

Abstract

We present a new type of flow model suitable for Antarctic blue ice areas, with application to dating ice for paleoclimate purposes. The volume conserving model uses field data for surface velocities, mass balance and ice thickness along a flow line, with parameterized variation of ice rheology with depth to produce particle trajectories and isochrones. The model is tested on the contrasting Allan Hills Near Western Ice Field and the Scharffenbergbotnen blue ice fields in Antarctica by comparing predicted ages with ages inferred from meteorites and ¹⁴C data. During the glacial periods, ice surface velocities at the Allan Hills must have been 25% less, and accumulation rates 50% less than present day values in order to match meteorite ages. In contrast, Scharffenbergbotnen velocities have probably been fairly constant over time due to the atypical valley where it resides.

Original language	English
Journal	Geophysical Research Letters
Volume	30
Issue number	19
ISSN	0094-8276
Publication status	Published - 2003
Externally published	Yes

Cite this

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title = "Dating Antarctic blue ice areas using a novel ice flow model",

abstract = "We present a new type of flow model suitable for Antarctic blue ice areas, with application to dating ice for paleoclimate purposes. The volume conserving model uses field data for surface velocities, mass balance and ice thickness along a flow line, with parameterized variation of ice rheology with depth to produce particle trajectories and isochrones. The model is tested on the contrasting Allan Hills Near Western Ice Field and the Scharffenbergbotnen blue ice fields in Antarctica by comparing predicted ages with ages inferred from meteorites and 14C data. During the glacial periods, ice surface velocities at the Allan Hills must have been 25% less, and accumulation rates 50% less than present day values in order to match meteorite ages. In contrast, Scharffenbergbotnen velocities have probably been fairly constant over time due to the atypical valley where it resides.",

author = "Aslak Grinsted and J Moore and Spikes, {V B} and A Sinisalo",

note = "Paper id:: 10.1029/2003GL017957",

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T1 - Dating Antarctic blue ice areas using a novel ice flow model

AU - Grinsted, Aslak

AU - Moore, J

AU - Spikes, V B

AU - Sinisalo, A

N1 - Paper id:: 10.1029/2003GL017957

PY - 2003

Y1 - 2003

N2 - We present a new type of flow model suitable for Antarctic blue ice areas, with application to dating ice for paleoclimate purposes. The volume conserving model uses field data for surface velocities, mass balance and ice thickness along a flow line, with parameterized variation of ice rheology with depth to produce particle trajectories and isochrones. The model is tested on the contrasting Allan Hills Near Western Ice Field and the Scharffenbergbotnen blue ice fields in Antarctica by comparing predicted ages with ages inferred from meteorites and 14C data. During the glacial periods, ice surface velocities at the Allan Hills must have been 25% less, and accumulation rates 50% less than present day values in order to match meteorite ages. In contrast, Scharffenbergbotnen velocities have probably been fairly constant over time due to the atypical valley where it resides.

AB - We present a new type of flow model suitable for Antarctic blue ice areas, with application to dating ice for paleoclimate purposes. The volume conserving model uses field data for surface velocities, mass balance and ice thickness along a flow line, with parameterized variation of ice rheology with depth to produce particle trajectories and isochrones. The model is tested on the contrasting Allan Hills Near Western Ice Field and the Scharffenbergbotnen blue ice fields in Antarctica by comparing predicted ages with ages inferred from meteorites and 14C data. During the glacial periods, ice surface velocities at the Allan Hills must have been 25% less, and accumulation rates 50% less than present day values in order to match meteorite ages. In contrast, Scharffenbergbotnen velocities have probably been fairly constant over time due to the atypical valley where it resides.

M3 - Journal article

SN - 0094-8276

VL - 30

JO - Geophysical Research Letters

JF - Geophysical Research Letters

IS - 19

ER -

Dating Antarctic blue ice areas using a novel ice flow model

Abstract

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