Evaluations of Environmental Trace Gases Monitoring Instrument (EMI) Level 1 Data

doi:10.3964/j.issn.1000-0593(2021)12-3881-06

	Evaluations of Environmental Trace Gases Monitoring Instrument (EMI) Level 1 Data
	Cheng Liang-xiao 3,4; Tao Jin-hua 3; Zhou Hai-jin 1; Yu Chao 3; Fan Meng 3; Wang Ya-peng 2; Wang Zhi-bao 5; Chen Liang-fu 3
刊名	SPECTROSCOPY AND SPECTRAL ANALYSIS
	2021-12-01
卷号	41
关键词	GF-5 EMI Wavelength calibration Slit function Data quality
ISSN号	1000-0593
DOI	10.3964/j.issn.1000-0593(2021)12-3881-06
通讯作者	Tao Jin-hua(taojh@radi.ac.cn)
英文摘要	The Environmental trace gases Monitoring Instrument (EMI) is the first high spectral resolution imaging spectrometer in China designed to monitor trace gas in tropospheric and stratospheric. To fully understand the instrument's characteristics and make better use of the level 1 (L1 ) data, comprehensive evaluations of irradiance and radiance data measured by the EMI instrument were carried out in this study. For both ultraviolet-2 and visible-1 bands, the slit function change drastically as a function of detectors in the across-track direction of charge-coupled device (CCD) , which is more than 6 times larger than that of TROP(OMI). The use of different slit functions according to the row can improve the calibration accuracy. Small wavelength shifts were found in both irradiance and radiance data with an average value of 0. 015 and 0. 03 nm, respectively. Although they meet the requirement of the design specification (0. 05 nm) , wavelength calibration is still needed during the trace gas retrieval. EMI irradiance data agree highly (r>0. 95) with OMI and TROPOMI and the reference solar spectrum. EMI radiance data also shows a better agreement (r>0. 93) with OMI and TROPOMI by averaging the cloud-free pixels over the clean Pacific region. This study demonstrates the good quality of current EMI L1 data for trace gas retrieval, and it provides a reference for the design and data quality evaluation scheme of subsequent instruments.
WOS关键词	COLUMN DENSITY RETRIEVAL ; NITROGEN-DIOXIDE ; SENTINEL-5 PRECURSOR ; TROPOMI ; CALIBRATION ; ALGORITHM ; FORMALDEHYDE ; QUALITY ; CLIMATE
WOS研究方向	Spectroscopy
语种	英语
出版者	OFFICE SPECTROSCOPY & SPECTRAL ANALYSIS
WOS记录号	WOS:000747245000038
内容类型	期刊论文
源URL	[http://ir.hfcas.ac.cn:8080/handle/334002/127506]
专题	中国科学院合肥物质科学研究院
通讯作者	Tao Jin-hua
作者单位	1.Chinese Acad Sci, Anhui Inst Opt & Fine Mech, Key Lab Environm Opt & Technol, Hefei 230031, Peoples R China 2.China Meteorol Adm, Natl Satellite Meteorol Ctr, Beijing 100081, Peoples R China 3.Beijing Normal Univ, Chinese Acad Sci, Aerosp Informat Res Inst, State Key Lab Remote Sensing Sci, Beijing 100101, Peoples R China 4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 5.Northeast Petr Univ, Sch Comp & Informat Technol, Daqing 163318, Peoples R China
推荐引用方式 GB/T 7714	Cheng Liang-xiao,Tao Jin-hua,Zhou Hai-jin,et al. Evaluations of Environmental Trace Gases Monitoring Instrument (EMI) Level 1 Data[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS,2021,41.
APA	Cheng Liang-xiao.,Tao Jin-hua.,Zhou Hai-jin.,Yu Chao.,Fan Meng.,...&Chen Liang-fu.(2021).Evaluations of Environmental Trace Gases Monitoring Instrument (EMI) Level 1 Data.SPECTROSCOPY AND SPECTRAL ANALYSIS,41.
MLA	Cheng Liang-xiao,et al."Evaluations of Environmental Trace Gases Monitoring Instrument (EMI) Level 1 Data".SPECTROSCOPY AND SPECTRAL ANALYSIS 41(2021).