Atmospheric CO2 mole fraction data of CONTRAIL-CME

Toshinobu Machida ^*1(ORCID iD iconorcid.org/0000-0003-3312-8775), Kentaro Ishijima^*3,*2, Yosuke Niwa ^*1(ORCID iD iconorcid.org/0000-0002-7600-9816), Kazuhiro Tsuboi^*3,*2, Yousuke Sawa^*2, Hidekazu Matsueda^*4, Motoki Sasakawa^*1
*1 Earth System Division, National Institute for Environmental Studies (NIES)
^*2 Meteorological Research Institute
^*3 Atmosphere and Ocean Department, Japan Meteorological Agency
^*4 Dokkyo University

2018年02月08日

2005年11月05日 - 2024年12月31日

NIES
Email: cgerdb_admin(at)nies.go.jp

10.17595/20180208.001

Text

2.2 GB

ver.202510 (Last updated: 2025年08月22日)

English

0.2 ppm

From 2005 (ongoing)

Sample air is drawn by a diaphragm pump from an intake port connected to the air conditioning duct of the aircraft and introduced into an NDIR (LI-COR, LI-840) of the CME. Water vapor is removed from the sample air by a membrane dryer (Nafion Dryer) and magnesium perchlorate.

Sample air is continuously introduced to the NDIR except for time periods when the line is switched to standard gases. Two standard gases (CO₂ in air), whose CO₂ mole fractions are traceable to the NIES 09 scale, are introduced into the NDIR every 10-15 min during the ascent or descent portion of the flight and every 20-60 min during the cruise. The standard gases flow for 50 seconds and the last 10-second signals are averaged for the calculation. Sample air signals are averaged every 10 and 60 seconds for the ascent/descent and cruising portion of the flight, respectively. The CO₂ mole fraction of sample air is calculated based on the signals of the standard gases taken before and after the sample signals. Sample measurements are corrected for the time lag of about 40 seconds between the intake of outside air and the measurement in the NDIR.

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[2025年08月22日]
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Toshinobu Machida(ORCID iD iconorcid.org/0000-0003-3312-8775)
Earth System Division, National Institute for Environmental Studies (NIES)

Yosuke Niwa(ORCID iD iconorcid.org/0000-0002-7600-9816)
Earth System Division, National Institute for Environmental Studies (NIES)

The observations of the CONTRAIL project are conducted under great support from Japan Airlines, JAMCO and the JAL Foundation. The CONTRAIL project has been financially supported by the research funds of the Global Environmental Research Coordination System (MOE0653, MOE1151, MOE1652, MOE2151) and the Environment Research and Technology Development Fund (JPMEERF20142001) from Ministry of the Environment of Japan.

Machida, T., H. Matsueda, Y. Sawa, Y. Nakagawa, K. Hirotani, N. Kondo, K. Goto, N. Nakazawa, K. Ishikawa and T. Ogawa (2008), Worldwide measurements of atmospheric CO₂ and other trace gas species using commercial airlines, J. Atmos. Oceanic Technol., 25(10), 1744-1754, doi:10.1175/2008JTECHA1082.1.

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