¹³CH₄ _ EOM _ aircraft - flask _ TU _ data1

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Organization

NO	70
Acronym	TU
Name	Tohoku University
Address 1	Center for Atmospheric and Oceanic Studies
Address 2	6-3 Aoba, Aramaki, Aoba-ku
Address 3	Sendai 980-8578
Country/Territory	Japan
Website	http://tgr.gp.tohoku.ac.jp

Contact(s)

Last updated date	2023-12-12
Name	Taku Umezawa
Prefix
Email	umezawa.taku@nies.go.jp
Organization No	53
Organization acronym	NIES
Organization name	National Institute for Environmental Studies
Organization country/territory	Japan
Address 1
Address 2
Address 3
Country/territory	Japan
Tel
Fax

Last updated date	2023-12-12
Name	Shinji Morimoto
Prefix	Prof.
Email	mon@tohoku.ac.jp
Organization No	70
Organization acronym	TU
Organization name	Tohoku University
Organization country/territory	Japan
Address 1
Address 2
Address 3	Aoba 6-3, Aramaki, Aoba-ku, Sendai 980-8578
Country/territory	Japan
Tel	+81-22-795-5780
Fax	+81-22-795-5797

Collaborator(s)

NO	53
Acronym	NIES
Name	National Institute for Environmental Studies

Unknown

UTC

permil

9999-12-31 00:00:00 - 9999-12-31 23:59:59: VPDB

Instrument(s)

9999-12-31 00:00:00 - 9999-12-31 23:59:59: delta plus XP, ThermoFisher Scientific Inc.(Mass spectrometry)

Intake Height above ground level

Sampling Frequency

event

Measurement Calibration

VPDB scale, details are in Umezawa et al. (2009) and Umezawa et al. (2012).
A pure CO2 cylinder is used for calibration. Details are in Umezawa et al. (2009) and Umezawa et al. (2012).

Data Processing

Processing for averaging

[Hourly]
[Daily]
[Monthly]

Original Data Quality Flag

Data Quality Flag (Valid/Invalid)

Observation Status

Terminated

Description

Temporal and spatial variations of 13CH4 in the upper troposphere over the western Pacific. Details are described in Umezawa et al. (2012).

The present 13CH4 measurements were done almost once a month from 2006-12-09 to 2010-03-15 for air samples collected along flight tracks between Japan and Australia or between Japan and Guam. For the period from 2010-05-20 to 2010-9-11, air samples collected during flights between Japan and Hawaii were measured.

The measurement system includes preconcentration of CH4, gas chromatgraph separation, combustion and isotope mass spectrometery. Details are in Umezawa et al. (2009).

Air samples were collected into 12 titanium flasks using the Automatic Air Sampling Equipment (ASE) for the JAL airliner flights. Details are described in Machida et al. (2008).

Meteorological Data Availability
(1: Available)

Wind direction:
Wind speed:
Relative humidity:
Precipitation amount:
Air pressure:
Air temperature:
Dew point temperature:
Sea water temperature:
Sea surface water temperature:
Sea water salinity:
Sea surface water salinity:

Meteorological Data Description

Meteorological data may remain as first provided, even when greenhouse gas data are updated.

No DOI available

Related information

Format	Text (WDCGG Data Format Table, WDCGG Meteorological Data Format Table), NetCDF
Relation List (Is Part Of)	All ¹³CH₄ data contributed to WDCGG by GAW stations and mobiles by 2023-07-20 All ¹³CH₄ data contributed to WDCGG by GAW stations and mobiles by 2022-07-13 All ¹³CH₄ data contributed to WDCGG by GAW stations and mobiles by 2021-07-07 All ¹³CH₄ data contributed to WDCGG by GAW stations and mobiles by 2020-09-02 All ¹³CH₄ data contributed to WDCGG by GAW stations and mobiles by 2019-09-03 All ¹³CH₄ data contributed to WDCGG by GAW stations and mobiles by 2018-10-18

Format

Text (WDCGG Data Format Table, WDCGG Meteorological Data Format Table), NetCDF

Relation List (Is Part Of)

All ¹³CH₄ data contributed to WDCGG by GAW stations and mobiles by 2023-07-20
All ¹³CH₄ data contributed to WDCGG by GAW stations and mobiles by 2022-07-13
All ¹³CH₄ data contributed to WDCGG by GAW stations and mobiles by 2021-07-07
All ¹³CH₄ data contributed to WDCGG by GAW stations and mobiles by 2020-09-02
All ¹³CH₄ data contributed to WDCGG by GAW stations and mobiles by 2019-09-03
All ¹³CH₄ data contributed to WDCGG by GAW stations and mobiles by 2018-10-18

GAW Data Policy

"For Scientific purposes, access to these data is unlimited and provided without charge. By their use you accept that an offer of co-authorship will be made through personal contact with the data providers or owners whenever substantial use is made of their data. In all cases, an acknowledgement must be made to the data providers or owners and to the data centre when these data are used within a publication."

Citation format

This format is an example of the WDCGG standard citation.
Please follow the citation format which the data providers or owners indicate.

Taku Umezawa (NIES), Shinji Morimoto (TU), Atmospheric ¹³CH₄ by CONTRAIL, Tohoku University, dataset published as ¹³CH₄_EOM_ aircraft-flask_TU_data1 at WDCGG, ver. 2023-12-12-0947 (Reference date^*: YYYY/MM/DD)

* As the reference date, please indicate the date you downloaded the files.

Reference(s)

1	Machida, T., H. Matsueda, Y. Sawa, Y. Nakagawa, K. Hirotani, N. Kondo, K. Goto, T. Nakazawa, K. Ishikawa, and T. Ogawa (2008), Worldwide measurements of atmospheric CO2 and other trace gas species using commercial airliners, Journal of Atmospheric and Oceanic Technology, 25(10), 1744–1754, doi:10.1175/2008JTECHA1082.1.
2	Umezawa, T., S. Aoki, T. Nakazawa and S. Morimoto (2009), A high-precision measurement system for carbon and hydrogen isotopic ratios of atmospheric methane and its application to air samples collected in the western Pacific region, Journal of the Meteorological Society of Japan, 87(3), 365–379.
3	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, Atmospheric Chemistry and Physics, 12, 8095–8113, doi:10.5194/acp-8095-2012.
4	CONTRAIL website: http://www.cger.nies.go.jp/contrail/index.html

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