气候变化领域集成服务门户(CCPortal): Greenland annual accumulation along the EGIG line, 1959-2004, from ASIRAS airborne radar and neutron-probe density measurements

CCPortal

DOI	10.5194/tc-10-1679-2016
	Greenland annual accumulation along the EGIG line, 1959-2004, from ASIRAS airborne radar and neutron-probe density measurements
	Overly T.B.; Hawley R.L.; Helm V.; Morris E.M.; Chaudhary R.N.
发表日期	2016
ISSN	19940416
卷号	10 期号:4
英文摘要	We report annual snow accumulation rates from 1959 to 2004 along a 250km segment of the Expéditions Glaciologiques Internationales au Groenland (EGIG) line across central Greenland using Airborne SAR/Interferometric Radar Altimeter System (ASIRAS) radar layers and high resolution neutron-probe (NP) density profiles. ASIRAS-NP-derived accumulation rates are not statistically different (95% confidence interval) from in situ EGIG accumulation measurements from 1985 to 2004. ASIRAS-NP-derived accumulation increases by 20% below 3000m elevation, and increases by 13% above 3000m elevation for the period 1995 to 2004 compared to 1985 to 1994. Three Regional Climate Models (PolarMM5, RACMO2.3, MAR) underestimate snow accumulation below 3000m by 16-20% compared to ASIRAS-NP from 1985 to 2004. We test radar-derived accumulation rates sensitivity to density using modeled density profiles in place of NP densities. ASIRAS radar layers combined with Herron and Langway (1980) model density profiles (ASIRAS-HL) produce accumulation rates within 3.5% of ASIRAS-NP estimates in the dry snow region. We suggest using Herron and Langway (1980) density profiles to calibrate radar layers detected in dry snow regions of ice sheets lacking detailed in situ density measurements, such as those observed by the Operation IceBridge campaign. © Author(s) 2016.
学科领域	accumulation rate; airborne sensor; altimeter; calibration; climate modeling; elevation; estimation method; ice sheet; in situ measurement; neutron probe; radar; sensitivity analysis; snow accumulation; Arctic; Greenland
语种	英语
scopus关键词	accumulation rate; airborne sensor; altimeter; calibration; climate modeling; elevation; estimation method; ice sheet; in situ measurement; neutron probe; radar; sensitivity analysis; snow accumulation; Arctic; Greenland
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/119607
作者单位	Dartmouth College, Hanover, NH, United States; Scott Polar Research Institute, Cambridge, United Kingdom; Alfred Wegener Institute, Bremerhaven, Germany
推荐引用方式 GB/T 7714	Overly T.B.,Hawley R.L.,Helm V.,et al. Greenland annual accumulation along the EGIG line, 1959-2004, from ASIRAS airborne radar and neutron-probe density measurements[J],2016,10(4).
APA	Overly T.B.,Hawley R.L.,Helm V.,Morris E.M.,&Chaudhary R.N..(2016).Greenland annual accumulation along the EGIG line, 1959-2004, from ASIRAS airborne radar and neutron-probe density measurements.Cryosphere,10(4).
MLA	Overly T.B.,et al."Greenland annual accumulation along the EGIG line, 1959-2004, from ASIRAS airborne radar and neutron-probe density measurements".Cryosphere 10.4(2016).