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Climate Variability & Change

This proposal builds on results obtained through repeat-track analysis of ICESat-I data over the Antarctic and Greenland ice sheets by the PI and her collaborators. Through this analysis, several regions of the ice sheets were observed to undergo rapid, variable elevation changes: subglacial lakes; supraglacial lakes; grounding zones and rifts. ICESat-I pointing accuracy is such that the tracks do not repeat exactly, and can deviate from a reference track by as much as 250 m. In areas of rapid (~months to years) and non-steady surface elevation change (e.g., subglacial/supraglacial lake surfaces, grounding zones and rifts), the combination of non-exact repeat tracks and a lack of direct knowledge of the cross-track slope leads to an uncertainty in the magnitude of the regional elevation change, since some of the derived elevation change arises from cross-track slope. Careful processing needs to be performed to account for this. Furthermore, in these regions, it is necessary to further examine the optimum ICESat-II parameters (footprint spacing and size) to ensure that sufficient information is being captured to sample these features. Our goal as part of the SDT is to ensure that these issues are considered during ICESat-II planning to allow optimized use of repeat-track analysis in regions of rapid elevation change.

Project PI: Helen Fricker/Scripps Institution of Oceanography

Scripps Institution of Oceanography, UCSD 9500 Gilman Drive La Jolla CA, 92093 Mail Code: 0225

Email: hafricker@ucsd.edu

http://scripps.ucsd.edu/Profile/hafricker

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Started: Aug 10, 2010

Last Activity: Dec 15, 2010

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