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A range correction for icesat and its potential impact on ice-sheet mass balance studies
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Moholdt, G. Borsa, A. A. Fricker, H. A. Brunt, Kelly M. |
| Copyright Year | 2014 |
| Description | We report on a previously undocumented range error in NASA's Ice, Cloud and land Elevation Satellite (ICESat) that degrades elevation precision and introduces a small but significant elevation trend over the ICESat mission period. This range error (the Gaussian-Centroid or 'G-C'offset) varies on a shot-to-shot basis and exhibits increasing scatter when laser transmit energies fall below 20 mJ. Although the G-C offset is uncorrelated over periods less than1 day, it evolves over the life of each of ICESat's three lasers in a series of ramps and jumps that give rise to spurious elevation trends of â0.92 to â1.90 cm yr(exp â1), depending on the time period considered. Using ICESat data over the Ross and Filchner-Ronne ice shelves we show that (1) the G-C offset introduces significant biases in ice-shelf mass balance estimates, and (2) the mass balance bias can vary between regions because of different temporal samplings of ICESat.We can reproduce the effect of the G-C offset over these two ice shelves by fitting trends to sample-weighted mean G-C offsets for each campaign, suggesting that it may not be necessary to fully repeat earlier ICESat studies to determine the impact of the G-C offset on ice-sheet mass balance estimates.|||||||| |
| File Size | 1191598 |
| Page Count | 13 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_20150000279 |
| Archival Resource Key | ark:/13960/t3vt6nj4w |
| Language | English |
| Publisher Date | 2014-03-03 |
| Access Restriction | Open |
| Subject Keyword | Mass Balance Ice-sheet Icesat Elevation Lasers Bias Range Errors Mass Distribution Waveforms Land Ice Centroids Antarctic Regions Estimates Balance Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
