DOI: 10.5194/tc-8-345-2014
Scopus记录号: 2-s2.0-84895793863
论文题名: A range correction for ICESat and its potential impact on ice-sheet mass balance studies
作者: Borsa A ; A ; , Moholdt G ; , Fricker H ; A ; , Brunt K ; M
刊名: Cryosphere
ISSN: 19940416
出版年: 2014
卷: 8, 期: 2 起始页码: 345
结束页码: 357
语种: 英语
英文关键词: atmospheric correction
; ice sheet
; ICESat
; mass balance
; sampling
英文摘要: 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 ≤ 1 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-0.92 to-1.90 cm yr-1, 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. © 2014 Author(s.). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/74883
Appears in Collections: 影响、适应和脆弱性 气候变化与战略
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作者单位: Scripps Institution of Oceanography, San Diego, CA, United States; Morgan State University, Baltimore, MD, United States; GESTAR, NASA Goddard Space Flight Center, Greenbelt, MD, United States
Recommended Citation:
Borsa A,A,, Moholdt G,et al. A range correction for ICESat and its potential impact on ice-sheet mass balance studies[J]. Cryosphere,2014-01-01,8(2)