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 | |
|
9999-12-31 00:00:00 - 9999-12-31 23:59:59: Tohoku University |
|
|
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)) |
|
| event | |
|
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). |
|
|
[Hourly] [Daily] [Monthly] |
|
| Temporarily suspended | |
| A chartered aircraft (Cessna 172) was used for air sampling. The aircraft took off Sendai Airport (38.13° N, 140.92° E) in the daytime under fine weather conditions and flew over the Pacific Ocean 20-50 km off the coast of the Sendai plain for about 2 hours to make a sample collection at 16 assigned altitudes. At each altitude, outside air was introduced into the cabin through Tygon tubing and pressurised at ~0.3 MPa above ambient pressure into a 350 mL stainless-steel flask using an electric diaphragm pump. See Umezawa et al. (2014). | |
|
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 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 (off the Pacific coast of Sendai), Tohoku University,
dataset published as CH4_PIP_
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. |
