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    GOCE’s view below the ice of Antarctica: Satellite gravimetry confirms improvements in Bedmap2 bedrock knowledge

    200748_132515_Hirt_GOCE_s_Antarctica.pdf (3.348Mb)
    Access Status
    Open access
    Authors
    Hirt, Christian
    Date
    2014
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Hirt, C. 2014. GOCE’s view below the ice of Antarctica: Satellite gravimetry confirms improvements in Bedmap2 bedrock knowledge. Geophysical Research Letters. 41 (14): pp. 5021-5028.
    Source Title
    Geophysical Research Letters
    DOI
    10.1002/2014GL060636
    ISSN
    0094-8276
    School
    Department of Spatial Sciences
    Remarks

    Copyright © 2014 American Geophysical Union. Published by John Wiley & Sons

    URI
    http://hdl.handle.net/20.500.11937/45830
    Collection
    • Curtin Research Publications
    Abstract

    Accurate knowledge of Antarctica's topography, bedrock, and ice sheet thickness is pivotal for climate change and geoscience research. Building on recent significant progress made in satellite gravity mapping with European Space Agency's Gravity field and Ocean Circulation Explorer (GOCE) mission, we here reverse the widely used approach of validating satellite gravity with topography and instead utilize the new GOCE gravity maps for novel evaluation of Bedmap1/2. Space-collected GOCE gravity reveals clear improvements in the Bedmap2 ice and bedrock data over Bedmap1 via forward modeled topographic mass and gravity effects at spatial scales of 400 to 80 km. Our study demonstrates GOCE's sensitivity for the subsurface mass distribution in the lithosphere and delivers independent evidence for Bedmap2's improved quality, reflecting new radar-derived ice thickness data. GOCE and Bedmap2 are combined to produce improved Bouguer gravity maps over Antarctica. We recommend incorporation of Bedmap2 in future high-resolution global topography and geopotential models and its use for detailed geoid modeling over Antarctica.

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