NO | 48 |
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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 |
Name | Kazuhiro Tsuboi |
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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 | |
Last updated date | 2024-08-13 |
Unknown | |
Unknown | |
ppm | |
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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event | |
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. | |
[Hourly] [Daily] [Monthly] |
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Temporarily suspended | |
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. |
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. |