|Name||Meteorological Research Institute|
|Address 1||Oceanography and Geochemistry Research Department|
|Address 2||Meteorological Research Institute|
|Address 3||1-1 Nagamine, Tsukuba, 305-0052, Japan|
|Organization name||Meteorological Research Institute|
|Address 1||1-1, Nagamine|
|Address 3||Ibaraki 305-0052|
|Last updated date||2019-11-22|
9999-12-31 00:00:00 - 9999-12-31 23:59:59: Shimadzu Gas Chromatograph GC-6AM equipped with an ECD(Gas chromatography (ECD))
The mixed gas of 20 ppmv CF2Cl2 and 20 ppmv CFCl3 in nitrogen gas (Nihon Sanso) was used as a primary reference gas. In order to make a reference gas for practical use, 200 μl of this gas was diluted with 10 l ultra pure nitrogen gas, which was passed through a U-shaped glass tube filled with active carbon (0 degrees centigrade), into a 20 l tedlar bag just before the analysis.
A primary reference gas for CF2Cl2 and CFCl3 was changed in 1984 (Seitetsu Kagaku) and again in 1986 (Nihon Sanso), respectively. The accuracy of the concentrations of these gases was certified to be better than ±5%.
Air samples were collected by means of an air-pump into stainless-steel cylinders on an aircraft (Piper Seneca, Piper Aztec, Aerocommander 685, Cessna 404, Merlin Ⅳ, Rear Jet etc.) over Japan between February 1978 and February 1996. CF2Cl2, CFCl3 and N2O in the air sample were analyzed using a Shimadzu Gas Chromatograph GC-6AM equipped with an ECD. The sample air in the cylinder was transferred to a gas sampler (Shimadzu MGS-4) and then to the gas chromatograph. Details of the air sampling and gas chromatographic measurement are described elsewhere (Muramatsu et al., 1982; Hirota et al., 1984, 1988, 1997).
Background concentrations over Japan, and their long-term trends.
This dataset was submitted to WDCGG by Michio Hirota on 2010/2/25.
Dr. Hirota retired from Japan Meteorological Agency in 2008.
Dew point temperature:
Sea water temperature:
Sea surface water temperature:
Sea water salinity:
Sea surface water salinity:
Meteorological data may remain as first provded, even when greenhouse gas data are updated.
|1||Muramatsu, H., M. Hirota, and Y. Makino, 1982: Gas-chromatographic Measurements of Dinitrogen Oxide in Air, Bull. Chem. Soc. Japan, 55, 117-120.|
|2||Hirota, M., H. Muramatsu, Y. Makino, T. Sasaki, and Y. Toyama, 1984: The Vertical Distributiobs of Atmospheric CF2Cl2, CFCl3 and N2O over Japan, J. Meteor. Soc. Japan, 62, 158-164.|
|3||Hirota, M., H. Muramatsu, T. Sasaki, Y. Makino and M. Asahi, 1988: Atmospheric Concentrations and Distributions of CF2Cl2, CFCl3 and N2O over Japan between 1979 and 1986, J. Meteor. Soc. Japan, 66, 703-708.|
|4||Hirota, M., Y. Makino, T. Sasaki, Y. Tsutsumi, Y. Zaizen and M. Ikegami, 1997: Tropospheric Concentrations and Distributions of CF2Cl2 and CFCl3 over Japan since 1978, Papers Meteor. Geophys., 48, 19-24.|
|5||The flights of 20 Oct. 1982, 20 Feb. 1983, 14 Feb. and 7 and 8 Aug. 1984, and 16 and 17 Dec. 1985 were carried out in the Middle Atmosphere Programme (1982-85), financially supported by the Ministry of Education, and the data are not included in the above references.|