In line with the GAW Data Policy, users should contact the contributors of all data of interest and propose co-authorship or acknowledgement.
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)
| Name | Taku Umezawa |
|---|---|
| Prefix | |
| 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. |
| 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 |
| Last updated date | 2023-12-12 |
| Unknown | |
| UTC+09:00 | |
| ppb | |
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9999-12-31 00:00:00 - 9999-12-31 23:59:59: Tohoku University |
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9999-12-31 00:00:00 - 2000-12-31 23:59:59: GC-9A (Shimadzu Corp.)(Gas chromatography (FID)) 2001-01-01 00:00:00 - 9999-12-31 23:59:59: Agilent 6890 (Agilent Technologies, Inc.)(Gas chromatography (FID)) |
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| event | |
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The CH4 concentration in each flask was determined against our working standard gases calibrated on the Tohoku University scale. The Tohoku University scale is based on primary standard gases prepared with uncertainty of 1 ppb using a gravimetrical method with four dilution stages (Aoki et al., 1992). We confirmed by regularly performing an intercalibration of our standard gases that our scale has been stable within our analytical repeatability for the period covered by the present observation programs. We have participated the WMO Round Robin intercomparison programme. See Umezawa et al. (2014). |
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[Hourly] [Daily] [Monthly] |
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This dataset include a flag for reliability of the sampling position as follows. 0: calculated based on the aircraft indicators and obviously reasonable. 1: same as 0, but obviously unreasonable. 2: interpolated based on the previous/following positions. 3: air-sampling positions were assigned along the reference route connecting Sendai and Fukuoka airports based on the sampling time. 4: Same as 3, but the sampling time was also assumed since the original record was lost. Contact to the contirbutors for more information. |
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| Temporarily suspended | |
| Air samples were collected on board commercial jet airlines (McDonnell- Douglas MD-80 and MD-90) between Sendai (38.13° N, 140.92° E) and Fukuoka (33.58° N, 130.45° E) airports, which were operated by Japan Air Systems (the former Toa Domestic Airlines) until 2004 and then by Japan Airlines. Outside air, which is introduced into the cockpit through an air-conditioning system of the aircraft, was collected at ~0.3 MPa above the cockpit pressure into a 350 mL stainless-steel flask by using a manual plunger pump developed at Tohoku University. Air sampling positions and altitudes were recorded from flight instruments of the aircraft. During a set of outbound and returning flights, 20 air samples were collected. See Umezawa et al. (2014). | |
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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: |
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Meteorological data may remain as first provided, even when greenhouse gas data are updated. |
No DOI available
Related information
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.
Please follow the citation format which the data providers or owners indicate.
Taku Umezawa (NIES),
Shinji Morimoto (TU),
Atmospheric CH4
by Aircraft (over Japan and mainland), Tohoku University,
dataset published as CH4_TDA_
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.
* As the reference date, please indicate the date you downloaded the files.
Reference(s)
| 1 | Umezawa, T., D. Goto, S. Aoki, K. Ishijima, P. K. Patra, S. Sugawara, S. Morimoto and T. Nakazawa, Variations of tropospheric methane over Japan during 1988-2010, Tellus B, 66, 23837, doi:10.3402/tellusb.v66.23837, 2014. |
|---|---|
| 2 | Aoki, S., T. Nakazawa, S. Murayama, and S. Kawaguchi, Measurements of atmospheric methane at the Japanese Antarctic Station, Syowa. Tellus B, 44, 273-281. DOI: 10.1034/j.1600- 0889.1992.t01-3-00005.x, 1992. |
