{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2024,9,25]],"date-time":"2024-09-25T04:25:16Z","timestamp":1727238316685},"reference-count":42,"publisher":"MDPI AG","issue":"18","license":[{"start":{"date-parts":[[2024,9,23]],"date-time":"2024-09-23T00:00:00Z","timestamp":1727049600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"European Space Agency\u2019s FRM Programme","award":["4000117640\/16\/I-LG","4000136108\/21\/I-DT-lr"]},{"name":"European Space Agency\u2019s project COCCON-PROCEEDS I-III","award":["4000121212\/17\/I-EF","4000140431\/23\/I-DT-Ir"]},{"name":"UK Centre for Earth Observation Instrumentation","award":["RP10G0435Z1"]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Remote Sensing"],"abstract":"The Total Carbon Column Observing Network (TCCON) and the Infrared Working Group of the Network for the Detection of Atmospheric Composition Change (NDACC-IRWG) are two ground-based networks that provide the retrieved concentrations of up to 30 atmospheric trace gases, using solar absorption spectrometry. Both networks provide reference measurements for the validation of satellites and models. TCCON concentrates on long-lived greenhouse gases (GHGs) for carbon cycle studies and validation. The number of sites is limited, and the geographical coverage is uneven, covering mainly Europe and the USA. A better distribution of stations is desired to improve the representativeness of the data for various atmospheric conditions and surface conditions and to cover a large latitudinal distribution. The two successive Fiducial Reference Measurements for Greenhouse Gases European Space Agency projects (FRM4GHG and FRM4GHG2) aim at the assessment of several low-cost portable instruments for precise measurements of GHGs to complement the existing ground-based sites. Several types of low spectral resolution Fourier transform infrared (FTIR) spectrometers manufactured by Bruker, namely an EM27\/SUN, a Vertex70, a fiber-coupled IRCube, and a Laser Heterodyne spectro-Radiometer (LHR) developed by UK Rutherford Appleton Laboratory are the participating instruments to achieve the Fiducial Reference Measurements (FRMs) status. Intensive side-by-side measurements were performed using all four instruments next to the Bruker IFS 125HR high spectral resolution FTIR, performing measurements in the NIR (TCCON configuration) and MIR (NDACC configuration) spectral range. The remote sensing measurements were complemented by AirCore launches, which provided in situ vertical profiles of target gases traceable to the World Meteorological Organization (WMO) reference scale. The results of the intercomparisons are shown and discussed. Except for the EM27\/SUN, all other instruments, including the reference TCCON spectrometer, needed modifications during the campaign period. The EM27\/SUN and the Vertex70 provided stable and precise measurements of the target gases during the campaign with quantified small biases. As part of the FRM4GHG project, one EM27\/SUN is now used as a travel standard for the verification of column-integrated GHG measurements. The extension of the Vertex70 to the MIR provides the opportunity to retrieve additional concentrations of N2O, CH4, HCHO, and OCS. These MIR data products are comparable to the retrieval results from the high-resolution IFS 125HR spectrometer as operated by the NDACC. Our studies show the potential for such types of spectrometers to be used as a travel standard for the MIR species. An enclosure system with a compact solar tracker and meteorological station has been developed to house the low spectral resolution portable FTIR systems for performing solar absorption measurements. This helps the spectrometers to be mobile and enables autonomous operation, which will help to complement the TCCON and NDACC networks by extending the observational capabilities at new sites for the observation of GHGs and additional air quality gases. The development of the retrieval software allows comparable processing of the Vertex70 type of spectra as the EM27\/SUN ones, therefore bringing them under the umbrella of the COllaborative Carbon Column Observing Network (COCCON). A self-assessment following the CEOS-FRM Maturity Matrix shows that the COCCON is able to provide GHG data products of FRM quality and can be used for either short-term campaigns or long-term measurements to complement the high-resolution FTIR networks.<\/jats:p>","DOI":"10.3390\/rs16183525","type":"journal-article","created":{"date-parts":[[2024,9,24]],"date-time":"2024-09-24T07:49:46Z","timestamp":1727164186000},"page":"3525","source":"Crossref","is-referenced-by-count":0,"title":["Fiducial Reference Measurement for Greenhouse Gases (FRM4GHG)"],"prefix":"10.3390","volume":"16","author":[{"ORCID":"http:\/\/orcid.org\/0000-0003-1440-1529","authenticated-orcid":false,"given":"Mahesh Kumar","family":"Sha","sequence":"first","affiliation":[{"name":"Royal Belgian Institute for Space Aeronomy, Ringlaan-3, 1180 Brussels, Belgium"}]},{"ORCID":"http:\/\/orcid.org\/0000-0003-4889-5889","authenticated-orcid":false,"given":"Martine","family":"De Mazi\u00e8re","sequence":"additional","affiliation":[{"name":"Royal Belgian Institute for Space Aeronomy, Ringlaan-3, 1180 Brussels, Belgium"}]},{"given":"Justus","family":"Notholt","sequence":"additional","affiliation":[{"name":"Institute of Environmental Physics, University of Bremen, Otto-Hahn-Allee 1, 28359 Bremen, Germany"}]},{"given":"Thomas","family":"Blumenstock","sequence":"additional","affiliation":[{"name":"Institute of Meteorology and Climate Research, Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1, 76344 Leopoldshafen, Germany"}]},{"given":"Pieter","family":"Bogaert","sequence":"additional","affiliation":[{"name":"Royal Belgian Institute for Space Aeronomy, Ringlaan-3, 1180 Brussels, Belgium"}]},{"given":"Pepijn","family":"Cardoen","sequence":"additional","affiliation":[{"name":"Royal Belgian Institute for Space Aeronomy, Ringlaan-3, 1180 Brussels, Belgium"}]},{"given":"Huilin","family":"Chen","sequence":"additional","affiliation":[{"name":"Joint International Research Laboratory of Atmospheric and Earth System Sciences, School of Atmospheric Sciences, Nanjing University, Nanjing 210023, China"}]},{"given":"Filip","family":"Desmet","sequence":"additional","affiliation":[{"name":"Royal Belgian Institute for Space Aeronomy, Ringlaan-3, 1180 Brussels, Belgium"}]},{"ORCID":"http:\/\/orcid.org\/0000-0002-8395-6440","authenticated-orcid":false,"given":"Omaira","family":"Garc\u00eda","sequence":"additional","affiliation":[{"name":"State Meteorological Agency of Spain (AEMet), La Marina-20, 38001 Santa Cruz de Tenerife, Spain"}]},{"given":"David W. T.","family":"Griffith","sequence":"additional","affiliation":[{"name":"Centre for Atmospheric Chemistry, School of Earth, Atmospheric and Life Sciences, University of Wollongong, Wollongong, NSW 2522, Australia"}]},{"given":"Frank","family":"Hase","sequence":"additional","affiliation":[{"name":"Institute of Meteorology and Climate Research, Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1, 76344 Leopoldshafen, Germany"}]},{"given":"Pauli","family":"Heikkinen","sequence":"additional","affiliation":[{"name":"Finnish Meteorological Institute, Space and Earth Observation Centre, T\u00e4htel\u00e4ntie 62, 99600 Sodankyl\u00e4, Finland"}]},{"given":"Benedikt","family":"Herkommer","sequence":"additional","affiliation":[{"name":"Institute of Meteorology and Climate Research, Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1, 76344 Leopoldshafen, Germany"}]},{"given":"Christian","family":"Hermans","sequence":"additional","affiliation":[{"name":"Royal Belgian Institute for Space Aeronomy, Ringlaan-3, 1180 Brussels, Belgium"}]},{"given":"Nicholas","family":"Jones","sequence":"additional","affiliation":[{"name":"Centre for Atmospheric Chemistry, School of Earth, Atmospheric and Life Sciences, University of Wollongong, Wollongong, NSW 2522, Australia"}]},{"ORCID":"http:\/\/orcid.org\/0000-0001-8828-2759","authenticated-orcid":false,"given":"Rigel","family":"Kivi","sequence":"additional","affiliation":[{"name":"Finnish Meteorological Institute, Space and Earth Observation Centre, T\u00e4htel\u00e4ntie 62, 99600 Sodankyl\u00e4, Finland"}]},{"given":"Nicolas","family":"Kumps","sequence":"additional","affiliation":[{"name":"Royal Belgian Institute for Space Aeronomy, Ringlaan-3, 1180 Brussels, Belgium"}]},{"given":"Bavo","family":"Langerock","sequence":"additional","affiliation":[{"name":"Royal Belgian Institute for Space Aeronomy, Ringlaan-3, 1180 Brussels, Belgium"}]},{"given":"Neil A.","family":"Macleod","sequence":"additional","affiliation":[{"name":"Space Science and Technology Department, STFC Rutherford Appleton Laboratory, Harwell Campus, Didcot OX11 0QX, UK"}]},{"given":"Jamal","family":"Makkor","sequence":"additional","affiliation":[{"name":"Institute of Environmental Physics, University of Bremen, Otto-Hahn-Allee 1, 28359 Bremen, Germany"}]},{"given":"Winfried","family":"Markert","sequence":"additional","affiliation":[{"name":"Institute of Environmental Physics, University of Bremen, Otto-Hahn-Allee 1, 28359 Bremen, Germany"}]},{"given":"Christof","family":"Petri","sequence":"additional","affiliation":[{"name":"Institute of Environmental Physics, University of Bremen, Otto-Hahn-Allee 1, 28359 Bremen, Germany"}]},{"given":"Qiansi","family":"Tu","sequence":"additional","affiliation":[{"name":"Institute of Meteorology and Climate Research, Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1, 76344 Leopoldshafen, Germany"},{"name":"School of Mechanical Engineering, Tongji University, 4800 Caoan Road, Jiading District, Shanghai 201804, China"}]},{"given":"Corinne","family":"Vigouroux","sequence":"additional","affiliation":[{"name":"Royal Belgian Institute for Space Aeronomy, Ringlaan-3, 1180 Brussels, Belgium"}]},{"ORCID":"http:\/\/orcid.org\/0000-0002-0178-7904","authenticated-orcid":false,"given":"Damien","family":"Weidmann","sequence":"additional","affiliation":[{"name":"Space Science and Technology Department, STFC Rutherford Appleton Laboratory, Harwell Campus, Didcot OX11 0QX, UK"}]},{"ORCID":"http:\/\/orcid.org\/0000-0003-3427-5873","authenticated-orcid":false,"given":"Minqiang","family":"Zhou","sequence":"additional","affiliation":[{"name":"Royal Belgian Institute for Space Aeronomy, Ringlaan-3, 1180 Brussels, Belgium"},{"name":"Institute of Atmospheric Physics, Chinese Academy of Sciences, Beichenxilu 81, Chaoyang, Beijing 100029, China"}]}],"member":"1968","published-online":{"date-parts":[[2024,9,23]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","unstructured":"Goryl, P., Fox, N., Donlon, C., and Castracane, P. 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