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

Authors :
Alberti, Carlos
Hase, Frank
Frey, Matthias
Dubravica, Darko
Blumenstock, Thomas
Dehn, Angelika
Castracane, Paolo
Surawicz, Gregor
Harig, Roland
Baier, Bianca
Bès, Caroline
Bi, Jianrong
Boesch, Hartmut
Butz, André
Cai, Zhaonan
Chen, Jia
Crowell, Sean
Deutscher, Nicholas
Ene, Dragos
Franklin, Jonathan
García, Omaira
Griffith, David
Grouiez, Bruno
Grutter, Michel
Hamdouni, Abdelhamid
Houweling, Sander
Humpage, Neil
Jacobs, Nicole
Jeong, Sujong
Joly, Lilian
Jones, Nicholas
Jouglet, Denis
Kivi, Rigel
Kleinschek, Ralph
Lopez, Morgan
Medeiros, Diogo
Morino, Isamu
Mostafavipak, Nasrin
Müller, Astrid
Ohyama, Hirofumi
Palmer, Paul
Pathakoti, Mahesh
Pollard, David
Raffalski, Uwe
Ramonet, Michel
Ramsay, Robbie
Sha, Mahesh Kumar
Shiomi, Kei
Simpson, William
Stremme, Wolfgang
Sun, Youwen
Tanimoto, Hiroshi
Té, Yao
Tsidu, Gizaw Mengistu
Velazco, Voltaire
Vogel, Felix
Watanabe, Masataka
Wei, Chong
Wunch, Debra
Yamasoe, Marcia
Zhang, Lu
Orphal, Johannes
Sha, Mahesh
Tsidu, Gizaw
Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette] (LSCE)
Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)
ICOS-RAMCES (ICOS-RAMCES)
Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)
Institut Pierre-Simon-Laplace (IPSL (FR_636))
École normale supérieure - Paris (ENS-PSL)
Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-École polytechnique (X)-Centre National d'Études Spatiales [Toulouse] (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)
Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique et Atmosphères = Laboratory for Studies of Radiation and Matter in Astrophysics and Atmospheres (LERMA)
Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris
Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-CY Cergy Paris Université (CY)
Source :
Atmospheric Measurement Techniques, Atmospheric Measurement Techniques, 2022, 15 (8), pp.2433-2463. ⟨10.5194/amt-15-2433-2022⟩
Publication Year :
2022
Publisher :
HAL CCSD, 2022.

Abstract

International audience; Abstract. 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.

Details

Language :
English
ISSN :
18671381 and 18678548
Database :
OpenAIRE
Journal :
Atmospheric Measurement Techniques, Atmospheric Measurement Techniques, 2022, 15 (8), pp.2433-2463. ⟨10.5194/amt-15-2433-2022⟩
Accession number :
edsair.od......3515..2ad3a33bb3ff84fe32ea0d1d7b565763