DOI: 10.1002/jgrd.50520
论文题名: Imaging spectroscopy of albedo and radiative forcing by light-absorbing impurities in mountain snow
作者: Painter T.H. ; Seidel F.C. ; Bryant A.C. ; McKenzie Skiles S. ; Rittger K.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 17 起始页码: 9511
结束页码: 9523
语种: 英语
英文关键词: albedo
; imaging spectroscopy
; light absorbing impurities
; radiative forcing
; snow
Scopus关键词: Atmospheric radiation
; Errors
; Grain size and shape
; Hydrology
; Infrared spectrometers
; Reflection
; Solar radiation
; Spectrometers
; Airborne visible/infrared imaging spectrometers
; albedo
; Hemispherical-directional reflectance factors
; Imaging spectroscopy
; Radiative forcings
; Root-mean square errors
; Spectral differences
; Spectral irradiance
; Snow
; absorption
; aerosol
; albedo
; AVIRIS
; hydrological cycle
; hydrological modeling
; mountain environment
; radiation balance
; radiative forcing
; regional climate
; snow
; spectroscopy
; Colorado
; United States
英文摘要: Recent studies show that deposition of dust and black carbon to snow and ice accelerates snowmelt and perturbs regional climate and hydrologic cycles. Radiative forcing by aerosols is often neglected in climate and hydrological models in part due to scarcity of observations. Here we describe and validate an algorithm suite (Imaging Spectrometer-Snow Albedo and Radiative Forcing (IS-SnARF)) that provides quantitative retrievals of snow grain size, snow albedo, and radiative forcing by light-absorbing impurities in snow and ice (LAISI) from Airborne Visible/Infrared Imaging Spectrometer (AVIRIS) data collected on 15 June 2011 in the Senator Beck Basin Study Area (SBBSA), SW Colorado, USA. Radiative forcing by LAISI is retrieved by the integral of the convolution of spectral irradiance with spectral differences between the spectral albedo (scaled from the observed hemispherical-directional reflectance factor (HDRF)) and modeled clean snow spectral albedo. The modeled surface irradiance at time of acquisition at test sites was 1052 W m-2 compared to 1048 W m-2 measured with the field spectroradiometer measurements, a relative difference of 0.4%. HDRF retrievals at snow and bare soil sites had mean errors relative to in situ measurements of -0.4 ± 0.1% reflectance averaged across the spectrum and root-mean-square errors of 1.5 ± 0.1%. Comparisons of snow albedo and radiative forcing retrievals from AVIRIS with in situ measurements in SBBSA showed errors of 0.001-0.004 and 2.1 ± 5.1 W m-2, respectively. A counterintuitive result was that, in the presence of light absorbing impurities, near-surface snow grain size increased with elevation, whereas we generally expect that at lower elevation the grain size would be larger. Key Points We describe imaging spectroscopy of radiative forcing by dust/BC in snowSnow albedo retrievals have errors of 0.1% to 0.4%.Radiative forcing by dust/BC has uncertainties of 2.1{plus minus}5.1 W m-2 ©2013. American Geophysical Union. All Rights Reserved. 资助项目: ATM04323237
; NNX10AO97G
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/63356
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109, United States; Joint Institute for Regional Earth System Science and Engineering, University of California, Los Angeles, CA, United States; Department of Geography, University of Utah, Salt Lake City, UT, United States
Recommended Citation:
Painter T.H.,Seidel F.C.,Bryant A.C.,et al. Imaging spectroscopy of albedo and radiative forcing by light-absorbing impurities in mountain snow[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(17)