DOI: 10.1002/2015GL065912
论文题名: Neither dust nor black carbon causing apparent albedo decline in Greenland's dry snow zone: Implications for MODIS C5 surface reflectance
作者: Polashenski C.M. ; Dibb J.E. ; Flanner M.G. ; Chen J.Y. ; Courville Z.R. ; Lai A.M. ; Schauer J.J. ; Shafer M.M. ; Bergin M.
刊名: Geophysical Research Letters
ISSN: 0094-8516
EISSN: 1944-8247
出版年: 2015
卷: 42, 期: 21 起始页码: 9319
结束页码: 9327
语种: 英语
英文关键词: albedo
; black carbon
; degradation
; dust
; Greenland
; MODIS
Scopus关键词: Degradation
; Dust
; Image reconstruction
; Radiometers
; Reflection
; Remote sensing
; Satellite imagery
; Snow
; Albedo
; Black carbon
; Dust concentrations
; Greenland
; Greenland Ice Sheet
; Moderate resolution imaging spectroradiometer
; MODIS
; Surface reflectance
; Solar radiation
; accuracy assessment
; albedo
; black carbon
; concentration (composition)
; degradation
; dust
; MODIS
; remote sensing
; sensor
; spatiotemporal analysis
; surface reflectance
; Terra (satellite)
; Arctic
; Greenland
; Greenland Ice Sheet
英文摘要: Remote sensing observations suggest Greenland ice sheet (GrIS) albedo has declined since 2001, even in the dry snow zone. We seek to explain the apparent dry snow albedo decline. We analyze samples representing 2012-2014 snowfall across NW Greenland for black carbon and dust light-absorbing impurities (LAI) and model their impacts on snow albedo. Albedo reductions due to LAI are small, averaging 0.003, with episodic enhancements resulting in reductions of 0.01-0.02. No significant increase in black carbon or dust concentrations relative to recent decades is found. Enhanced deposition of LAI is not, therefore, causing significant dry snow albedo reduction or driving melt events. Analysis of Collection 5 Moderate Resolution Imaging Spectroradiometer (MODIS) surface reflectance data indicates that the decline and spectral shift in dry snow albedo contains important contributions from uncorrected Terra sensor degradation. Though discrepancies are mostly below the stated accuracy of MODIS products, they will require revisiting some prior conclusions with C6 data. © 2015. American Geophysical Union. All Rights Reserved.
URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84955209371&doi=10.1002%2f2015GL065912&partnerID=40&md5=a72103e218812481ce66c1ed8f8a483d
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/8132
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: USACE-CRREL, Ft. Wainwright, AK, United States
Recommended Citation:
Polashenski C.M.,Dibb J.E.,Flanner M.G.,et al. Neither dust nor black carbon causing apparent albedo decline in Greenland's dry snow zone: Implications for MODIS C5 surface reflectance[J]. Geophysical Research Letters,2015-01-01,42(21).