Improved calibration procedures for the EM27/SUN spectrometers of the COllaborative Carbon Column Observing Network (COCCON)

doi:10.5194/amt-15-2433-2022

	Improved calibration procedures for the EM27/SUN spectrometers of the COllaborative Carbon Column Observing Network (COCCON)
	Alberti, Carlos 1; Hase, Frank 1; Frey, Matthias 2; Dubravica, Darko 1; Blumenstock, Thomas 1; Dehn, Angelika 3; Castracane, Paolo 3; Surawicz, Gregor 4; Harig, Roland 4; Baier, Bianca C.5,6
刊名	ATMOSPHERIC MEASUREMENT TECHNIQUES
	2022-04-22
卷号	15
ISSN号	1867-1381
DOI	10.5194/amt-15-2433-2022
通讯作者	Alberti, Carlos(carlos.alberti@kit.edu)
英文摘要	In this study, an extension on the previously reported status of the COllaborative Carbon Column Observing Network's (COCCON) calibration procedures incorporating refined methods is presented. COCCON is a global network of portable Bruker EM27/SUN FTIR spectrometers for deriving column-averaged atmospheric abundances of greenhouse gases. The original laboratory open-path lamp measurements for deriving the instrumental line shape (ILS) of the spectrometer from water vapour lines have been refined and extended to the secondary detector channel incorporated in the EM27/SUN spectrometer for detection of carbon monoxide (CO). The refinements encompass improved spectroscopic line lists for the relevant water lines and a revision of the laboratory pressure measurements used for the analysis of the spectra. The new results are found to be in good agreement with those reported by Frey et al. (2019) and discussed in detail. In addition, a new calibration cell for ILS measurements was designed, constructed and put into service. Spectrometers calibrated since January 2020 were tested using both methods for ILS characterization, open-path (OP) and cell measurements. We demonstrate that both methods can detect the small variations in ILS characteristics between different spectrometers, but the results of the cell method indicate a systematic bias of the OP method. Finally, a revision and extension of the COCCON network instrument-to-instrument calibration factors for XCO2, XCO and XCH4 is presented, incorporating 47 new spectrometers (of 83 in total by now). This calibration is based on the reference EM27/SUN spectrometer operated by the Karlsruhe Institute of Technology (KIT) and spectra collected by the collocated TCCON station Karlsruhe. Variations in the instrumental characteristics of the reference EM27/SUN from 2014 to 2017 were detected, probably arising from realignment and the dual-channel upgrade performed in early 2018. These variations are considered in the evaluation of the instrument-specific calibration factors in order to keep all tabulated calibration results consistent.
资助项目	Romanian National Core Program[18N/2019] ; SAo Paulo Research Foundation (FAPESP)[2019/27079-2] ; Australian Research Council (ARC)[DP160101598] ; Australian Research Council (ARC)[LE0668470]
WOS关键词	INSTRUMENTAL LINE-SHAPE ; FOURIER-TRANSFORM SPECTROMETER ; PORTABLE FTIR SPECTROMETERS ; NEAR-INFRARED SENSOR ; ATMOSPHERIC COMPOSITION ; METHANE EMISSIONS ; PERFORMANCE ; RETRIEVAL ; MISSION ; VALIDATION
WOS研究方向	Meteorology & Atmospheric Sciences
语种	英语
出版者	COPERNICUS GESELLSCHAFT MBH
WOS记录号	WOS:000785858900001
资助机构	Romanian National Core Program ; SAo Paulo Research Foundation (FAPESP) ; Australian Research Council (ARC)
内容类型	期刊论文
源URL	[http://ir.hfcas.ac.cn:8080/handle/334002/131498]
专题	中国科学院合肥物质科学研究院
通讯作者	Alberti, Carlos
作者单位	1.Karlsruhe Inst Technol KIT, Inst Meteorol & Climate Res IMK ASF, Karlsruhe, Germany 2.Natl Inst Environm Studies NIES, Tsukuba, Ibaraki, Japan 3.European Space Agcy, Ctr Earth Observat ESA ESRIN, Frascati, Italy 4.Bruker Opt GmbH, Ettlingen, Germany 5.Univ Colorado, Cooperat Inst Res Environm Sci, Boulder, CO 80309 USA 6.NOAA, Earth Syst Res Lab, Global Monitoring Div, Boulder, CO USA 7.Ctr Natl Etud Spatiales CNES, Paris, France 8.Lanzhou Univ, Coll Atmospher Sci, Key Lab Semiarid Climate Change, Minist Educ, Lanzhou, Peoples R China 9.Univ Leicester, Natl Ctr Earth Observat, Leicester, Leics, England 10.Heidelberg Univ, Inst Umweltphys, Heidelberg, Germany
推荐引用方式 GB/T 7714	Alberti, Carlos,Hase, Frank,Frey, Matthias,et al. Improved calibration procedures for the EM27/SUN spectrometers of the COllaborative Carbon Column Observing Network (COCCON)[J]. ATMOSPHERIC MEASUREMENT TECHNIQUES,2022,15.
APA	Alberti, Carlos.,Hase, Frank.,Frey, Matthias.,Dubravica, Darko.,Blumenstock, Thomas.,...&Orphal, Johannes.(2022).Improved calibration procedures for the EM27/SUN spectrometers of the COllaborative Carbon Column Observing Network (COCCON).ATMOSPHERIC MEASUREMENT TECHNIQUES,15.
MLA	Alberti, Carlos,et al."Improved calibration procedures for the EM27/SUN spectrometers of the COllaborative Carbon Column Observing Network (COCCON)".ATMOSPHERIC MEASUREMENT TECHNIQUES 15(2022).