气候变化领域集成服务门户(CCPortal): A range correction for ICESat and its potential impact on ice-sheet mass balance studies

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DOI	10.5194/tc-8-345-2014
	A range correction for ICESat and its potential impact on ice-sheet mass balance studies
	Borsa A.A.; Moholdt G.; Fricker H.A.; Brunt K.M.
发表日期	2014
ISSN	19940416
卷号	8 期号:2
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.).
学科领域	atmospheric correction; ice sheet; ICESat; mass balance; sampling
语种	英语
scopus关键词	atmospheric correction; ice sheet; ICESat; mass balance; sampling
来源期刊	Cryosphere
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/120147
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
推荐引用方式 GB/T 7714	Borsa A.A.,Moholdt G.,Fricker H.A.,et al. A range correction for ICESat and its potential impact on ice-sheet mass balance studies[J],2014,8(2).
APA	Borsa A.A.,Moholdt G.,Fricker H.A.,&Brunt K.M..(2014).A range correction for ICESat and its potential impact on ice-sheet mass balance studies.Cryosphere,8(2).
MLA	Borsa A.A.,et al."A range correction for ICESat and its potential impact on ice-sheet mass balance studies".Cryosphere 8.2(2014).