Atmospheric CO2 mole fraction data of CONTRAIL-CME

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This data set contains CO2 mole fractions observed by Continuous CO2 Measuring Equipment (CME) onboard commercial aircraft under the CONTRAIL (Comprehensive Observation Network for TRace gases by AIrLiner) project. The project started in 2005 with two Boeing 747-400 aircraft and three 777-200ER aircraft operated by Japan Airlines (JAL) between Japan and Europe, Asia, Australia, Hawaii and North America. As of 2017, eight 777-200ER and two 777-300ER aircraft are used for the CME observation. The mole fraction values are obtained from 10-second average values of the CME signals for the ascending and descending portion of the flight and from 1-minute averages for the cruise.

Description

Creator
Release date
2018/02/08
Temporal coverage
2005/11/05 - 2015/12/31
Data provider
NIES
Email: cgerdb_admin(at)nies.go.jp
DOI
File format
Text
Data volume
145.6MiB
Version
ver.2017.1.0 (Last updated: 2018/02/08)
Language
English

Data Set

Parameters
Atmospheric CO2 mole fraction
Precision
0.2 ppm
Observation period
From 2005 (ongoing)
Measurement method
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.
Calculation method
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.
Keywords
[GCMD_Platform]
Aircraft > AIRCRAFT
[GCMD_Science]
Atmosphere > Atmospheric Chemistry > Carbon and Hydrocarbon Compounds > Carbon Dioxide
[Free keywords]
Carbon Dioxide, CO2, Aircraft, B747-400, B777-200ER, B777-300ER
Update history
[2018/02/08]
Data for 2005-2015 are released. ver.2017.1.0.

References

References
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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When publishing any Products based on the present data set, it must be clearly stated that the present data set was used.
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Citation format
When this data set is referred to in publications, it should be cited in the following format.
Machida et al. (2018), Atmospheric CO2 mole fraction data of CONTRAIL-CME, Ver.x.x.x *1, Center for Global Environmental Research, NIES, DOI:10.17595/20180208.001, (Reference date*2: YYYY/MM/DD)
*1 The version number is indicated in the name of each data file.
*2 As the reference date, please indicate the date you downloaded the files.
When generally referring to the CONTRAIL-CME CO2 data, please also cite Machida et al. (2008). Furthermore, the User is encouraged to cite relevant paper(s) listed at http://www.cger.nies.go.jp/contrail/pubs.html.
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Re-distribution of the data or release of Products derived from the data set, shall be reported to the Data Provider without delay.
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Any error in the data set, or the suspicion thereof, should be immediately reported to the Data Provider.
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