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 | 48 |
|---|---|
| Acronym | MRI |
| Name | Meteorological Research Institute |
| Address 1 | Department of Climate and Geochemistry Research |
| Address 2 | Meteorological Research Institute |
| Address 3 | 1-1 Nagamine, Tsukuba, 305-0052, Japan |
| Country/Territory | Japan |
| Website | https://www.mri-jma.go.jp/index_en.html |
Contact(s)
| Name | Kazuhiro Tsuboi |
|---|---|
| Prefix | Mr. |
| ktsuboi@mri-jma.go.jp | |
| Organization No | 48 |
| Organization acronym | MRI |
| Organization name | Meteorological Research Institute |
| Organization country/territory | Japan |
| Address 1 | 1-1, Nagamine |
| Address 2 | Tsukuba |
| Address 3 | Ibaraki 305-0052 |
| Country/territory | Japan |
| Tel | +81-29-853-8720 |
| Fax | +81-29-853-8728 |
| Last updated date | 2023-08-30 |
| Unknown | |
| Unknown | |
| ppm | |
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9999-12-31 00:00:00 - 9999-12-31 23:59:59: Shimadzu Gas Chromatograph GC-14A equipped with an FID and a data processor Shimadzu C-R4A(Gas chromatography (FID)) |
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The accuracy of the concentrations of some reference gases was in the range of ±1.5%, which were certified by the Chemical Inspection & Testing Institute (Japan). Since August 1996, the accuracy of those are in the range of ±1.0%, which are certified by the manufacturer oneself. In 1991, both laboratories of MRI and NOAA/CMDL determined the concentration of CH4 in NOAA cylinder #30507, filled with dried natural air at Niwot Ridge in 1988. MRI determined the CH4 mixing ratio in dry air to be 1749.2(±2.7) ppbv, while NOAA/CMDL measured the same cylinder as 1731.6(±1.3) ppbv on the so-called "Rasmussen-scale". There is a small, but significant offset between the two calibration scales. Mixed gases of 1.7-1.8ppmv CH4 in pure air (Takachiho) are used as the reference gas. |
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| Only technically false values caused by malfunction of the equipment are removed. | |
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[Hourly] [Daily] [Monthly] |
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| Temporarily suspended | |
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The height of the sampling point on 1992.2.11, 11:27 is 1000 meters, give or take 300 meters. Air samples were collected on an aircraft (Aerocommander 685, Cessna 404, and Merlin IV) into stainless-steel cylinders up to an altitude of 7 km between February 1986 and February 2000. CH4 was analyzed using a Shimadzu Gas Chromatograph GC-14A equipped with an FID and a data processor Shimadzu C-R4A. A reference gas and a sample air are measured in series. The sample air is dried by an electronic cooler and a tube filled with magnesium perchlorate (6-14 mesh). The sample size is 10ml. Methane is separated on a 1m Porapak N precut column and a 1m Active Carbon main column at 60°C. Background concentration over Japan, and its seasonal variability and long-term trend. This dataset was submitted to WDCGG by Michio Hirota on 2005/12/28. Dr. Hirota retired from Japan Meteorological Agency in 2008. |
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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.
Kazuhiro Tsuboi (MRI),
Atmospheric CH4
by Aircraft (over Japan and surroundings), Meteorological Research Institute,
dataset published as CH4_OAS_
aircraft-flask_MRI_data1 at WDCGG,
ver. 2021-10-15-1330 (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 | Hirota, M., H. Muramatsu, Y. Makino, M. Ikegami, and K. Tsutsumi, 1989: Gas-chromatographic measurement of atmospheric methane in Japan, Atmos. Environ., 23, 1835-1839. |
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| 2 | Hirota, M., T. Aoki, Y. Makino, and S. Murayama, 1991: Atmospheric methane concentration between Tokyo and Syowa Station, Antarctica, Bull. Chem. Soc. Japan, 1991, 358-360. |
| 3 | Hirota, M., Y. Tsutsumi, Y. Makino, T. Sasaki, Y. Zaizen, and M. Ikegami, 1999: Variation and long-term trends in tropospheric methane (CH4) concentration over Japan since 1986, Papers Met. Geophys., 49, 43-58. |
