|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|
|Organization name||Meteorological Research Institute|
|Address 1||1-1, Nagamine|
|Address 3||Ibaraki 305-0052|
|Last updated date||2023-08-30|
9999-12-31 00:00:00 - 9999-12-31 23:59:59: SHIMADZU
6AM (Gas chromatography (ECD))
|A reference gas was made by diluting pure SF6 (Takachiho, >99.8%) with pure N2 into a tedlar bag(20l). By a two-step static dilution, a reference gas of SF6 in N2 was made. The SF6 in the tedlar bag was constant in a few days. The error in repeated measurements at 1.0ppt (sample size: 2ml) was 10%. In practice, volume mixing ratios of SF6 were calculated from those of CCl2F2 by making use of the fact that the peak height of SF6 was about 20 times higher than that of CCl2F2, which was eluted about 20s after SF6. Therefore, a mixed gas of 20ppm CCl2F2 and 20ppm CCl3F in pure N2 (Nihon Sanso) were used as a primary reference gas. In the measurement of the sensitivity ratio, a mixed gas of 10ppt SF6 and 400ppt CCl2F2 in pure N2 was used.|
Higher mixing ratios were often observed over urban areas up to an altitude of 2km.
The mean tropospheric mixing ratio for each observation flight was calculated excluding those values below an altitude of 2km.
-99 : Valid
* : The sampled air might be contaminated with a room air (Because the mixing ratio of CFCl3 in the same sample was also high).
The air sampled on 1983.2.7, 11:46 at the height of 7000 m might be contaminated with a room air, because the mixing ratio of CFCl3 in the same sample was also high.
Air samples were collected on an Aircraft (Aerocommander 685 or Cessna 404) into stainless steel cylinders up to an altitude of 8km in February and December 1982, and February 1983.
Background concentration over Japan and its long-term trend.
This dataset was submitted to WDCGG by Michio Hirota on 2001/7/31.
Dr. Hirota retired from Japan Meteorological Agency in 2008.
Wind direction: 0
Wind speed: 0
Relative humidity: 0
Precipitation amount: 0
Air pressure: 1
Air temperature: 0
Dew point temperature: 0
Sea water temperature: 0
Sea surface water temperature: 0
Sea water salinity: 0
Sea surface water salinity: 0
Meteorological data may remain as first provided, even when greenhouse gas data are updated.
The file was made using the former WDCGG data file.
|Format||Text (WDCGG Data Format Table, WDCGG Meteorological Data Format Table), NetCDF|
|Relation List (Is Part Of)||
All SF6 data contributed to WDCGG by GAW stations and mobiles by 2023-09-13
All SF6 data contributed to WDCGG by GAW stations and mobiles by 2022-09-05
All SF6 data contributed to WDCGG by GAW stations and mobiles by 2021-08-16
All SF6 data contributed to WDCGG by GAW stations and mobiles by 2020-09-28
All SF6 data contributed to WDCGG by GAW stations and mobiles by 2019-09-19
All SF6 data contributed to WDCGG by GAW stations and mobiles by 2018-10-23
|1||Hirota M. and H. Muramatsu, 1989: Gas-chromatographic measurements of atmospheric sulfur hexafluoride, Bull. Chem. Soc. Japan, 59, 329-331.|