Effects of spectral sampling rate and range of CO_2 absorption bands on XCO_2 retrieval from TanSat hyperspectral spectrometer
Effects of spectral sampling rate and range of CO_2 absorption bands on XCO_2 retrieval from TanSat hyperspectral spectrometer作者机构:Key Laboratory of Middle Atmosphere and Global Environment ObservationInstitute of Atmospheric PhysicsChinese Academy of Sciences Changchun Institute of OpticsFine Mechanics and PhysicsChinese Academy of Sciences
出 版 物:《Chinese Science Bulletin》 (中国科学通报)
年 卷 期:2014年第59卷第14期
页 面:1485-1491页
核心收录:
基 金:supported by the Strategic Priority Research Program-Climate Change: Carbon Budget and Relevant Issues (XDA05040200) the National High-tech R&D Program of China (2011AA12A104) the National Natural Science Foundation of China (41205018)
主 题:采样速率 高光谱 CO2 光谱仪 吸收带 检索 地表反照率 光谱分辨率
摘 要:The spectral sampling rate and range of CO2absorption bands are critical for the optimal design of hyperspectral instrument for CO2observation *** of spectra in space-based spectrometer significantly contaminates signals measured in the CO21.61 *** CO2dry-air column(XCO2)error due to spectral undersampling can be up to*1 ppm,which is the target precision of the Chinese Carbon Satellite(TanSat)for a single *** error depends on surface albedo,solar zenith angle,and scattering properties in the *** spectral sampling rate is recommended to be greater than 2.0 pixels per full width at half maximum to avoid *** of spectral resolution and the use of narrower spectral regions can improve spectral sampling with little changes in CO2retrieval sensitivity without losing much *** full-band approach provides direct constraints on the wavelength-dependent surface albedo and particle scattering from the *** keep a broader band,we recommend reduction of the spectral resolution by a factor of two.