Atmospheric trace gas data from the CONTRAIL flask air sampling over the Pacific Ocean

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This data set contains trace gas mole fractions observed over the Pacific Ocean by the flask air sampling of the CONTRAIL (Comprehensive Observation Network for TRace gases by AIrLiner) project. Air samples were collected by the Automatic air Sampling Equipment (ASE) and occasionally manually by the Manual air Sampling Equipment (MSE) on board commercial aircraft of Japan Airlines (JAL). This data set consists of observational data between Japan and Australia, Guam, and Hawaii.

Description

Creator
Toshinobu Machida*1 (orcd.org/0000-0003-3312-8775), Hidekazu Matsueda*2, Yousuke Sawa*2,*3, Yosuke Niwa*1 (orcd.org/0000-0002-7600-9816)
*1 Center for Global Environmental Research (CGER), National Institute for Environmental Studies (NIES)
*2 Meteorological Research Institute
*3 Now at Global Environment and Marine Department, Japan Meteorological Agency
Release date
2019/08/28
Temporal coverage
1993/04/23 - 2017/12/02
Data provider
NIES
Email: cgerdb_admin(at)nies.go.jp
DOI
File format
Text
Data volume
2.43 MiB
Version
ver.2019.1.0 (Last updated: 2019/08/28)
Language
English

Data Set

Parameters
Atmospheric mole fractions of CO2 and CH4
Observation period
From April 23, 1993 (ongoing)
Measurement method
Air samples were introduced to various analyzers by an automated analysis system. The CO2 mole fraction was measured using a nondispersive infrared gas analyzer (NDIR; LI-6252 or LI-6262, LI-COR) and the CH4 mole fraction was measured using a gas chromatograph (Agilent 5890 or 7890A, Agilent Technologies Inc.) equipped with a flame ionization detector (GC-FID).
Calculation method
The CO2 and CH4 mole fractions in the sample air were calculated by least square fit assuming a quadratic relationship between the responses of analyzers and the mole fractions of four standard gases. The values of standard gases were based on the NIES95 scale for CO2 and the NIES94 scale for CH4.
Keywords
[GCMD_Platform]
Aircraft > AIRCRAFT
[GCMD_Science]
Atmosphere > Atmospheric Chemistry > Carbon and Hydrocarbon Compounds > Carbon Dioxide
Atmosphere > Atmospheric Chemistry > Carbon and Hydrocarbon Compounds > Methane
[Free keywords]
Carbon Dioxide, CO2, Methane, CH4, Aircraft, B747-400, B777-200ER, B777-300ER
Update history
[2019/08/28]
Data of CO2 and CH4 are released. ver.2019.1.0.

References

References
Matsueda, H., T. Machida, Y. Sawa, Y. Niwa (2015), Long-term change of CO2 latitudinal distribution in the upper troposphere, Geophys. Res. Lett., 42, doi:10.1002/2014GL062768.
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.
Matsueda, H., T. Machida, Y. Sawa, Y. Nakagawa, K. Hirotani, H. Ikeda, N. Kondo, and K. Goto (2008), Evaluation of atmospheric CO2 measurements from new flask air sampling of JAL airliner observations, Pap. Meteorolo. Geophys., 59, 1-17, doi:10.2467/mripapers.59.1.
Umezawa, T., T. Machida, K. Ishijima, H. Matsueda, Y. Sawa, P. K. Patra, S. Aoki, and T. Nakazawa (2012), Carbon and hydrogen isotopic ratios of atmospheric methane in the upper troposphere over the Western Pacific, Atmos. Chem. Phys., 12, 8095-8113, doi:10.5194/acp-12-8095-2012.
Matsueda, H., H. Y. Inoue, and M. Ishii (2002), Aircraft observation of carbon dioxide at 8-13 km altitude over the western Pacific from 1993 to 1999, Tellus, 54B,1-21, doi:10.3402/tellusb.v54i1.16645.

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Unless special reason exists, the User shall use the latest version of this data set.
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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.
However, the Author may request the User to delete the citation from the Product. In that case, the User shall comply with the request within reasonable extent.
If these data have an important part in the User's Product, the User must contact the Author concerning co-authorship before publication. Citing this data set as described below and acknowledging the Author are enough when these data play a minor role in the User's Product (e.g., global analyses such as inverse modeling).
Citation format
When this data set is referred to in publications, it should be cited in the following format.
Machida, T., H. Matsueda, Y. Sawa, and Y. Niwa (2019), Atmospheric trace gas data from the CONTRAIL flask air sampling over the Pacific Ocean, ver.x.x.x*1, Center for Global Environmental Research, NIES, DOI:10.17595/20190828.001. (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 flask sampling data of CONTRAIL, please also cite Matsueda et al. (2015) and Machida et al. (2008). Furthermore, the User is encouraged to cite relevant paper(s) listed at above References (see http://www.cger.nies.go.jp/contrail/pubs.html for more references). Specifically, the User who used the CH4 data is recommended to refer Umezawa et al. (2012).
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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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The Author and the Data Provider shall not have any liability or responsibility whatsoever for any damage that may arise from the use of this data set, and the User must not imply that any guarantee is provided by the Author or the Data Provider. Any injury or loss arising from the use of this data set is solely the responsibility of the User.

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