Effects of spectral sampling rate and range of CO_2 absorption bands on XCO_2 retrieval from TanSat hyperspectral spectrometer

作     者：Yi Liu Zhaonan Cai Dongxu Yang Yuquan Zheng Minzheng Duan Daren L 

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：

学科分类：08[工学] 0803[工学-光学工程] 

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.