NO | 53 |
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Acronym | NIES |
Name | National Institute for Environmental Studies |
Address 1 | |
Address 2 | National Institute for Environmental Studies |
Address 3 | 16-2 Onogawa, Tsukuba 305-8506, Japan |
Country/Territory | Japan |
Website | https://www.nies.go.jp/index-e.html |
Name | Yasunori TOHJIMA |
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Prefix | Dr. |
tohjima@nies.go.jp | |
Organization No | 53 |
Organization acronym | NIES |
Organization name | National Institute for Environmental Studies |
Organization country/territory | Japan |
Address 1 | |
Address 2 | National Institute for Environmental Studies |
Address 3 | 16-2, Onogawa, Tsukuba-shi, Ibaraki 305-8506, Japan |
Country/territory | Japan |
Tel | |
Fax | |
Last updated date | 2023-06-28 |
Monitoring background conditions, and the influence of air pollution | |
UTC | |
ppb | |
9999-12-31 00:00:00 - 9999-12-31 23:59:59: NIES94 |
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9999-12-31 00:00:00 - 9999-12-31 23:59:59: Hewlett Packard 5890 II, Agilent GC 7890 etc.(Gas chromatography (FID)) |
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9999-12-31 00:00:00 - 9999-12-31 23:59:59: 37 (m) |
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10 minutes | |
NIES Primary standard gases are gravimetrically prepared CH4-in-air mixtures. From January 1996 to November 1997, a standard gas was injected every 3.5 hours. CH4 concentrations of air samples were calculated with calibration lines, determined by the data from the two sets of working standard gases,measured just before and after the set of the air samples. Since December 1997, three working standard gases of different CH4 concentrations are injected every 2 hours. CH4 concentrations of air samples are calculated with calibration curves, which are determined by the data from the two sets of working standard gases, measured just before and after the set of air samples. The calibration curve is expressed as a function of peak height (h) and time (t) as follows: y=a+bh+ct, where constant a, b, and c were determined by least square fiitting. The mole fraction is determined from this fitting curve. The CH4 mole fractions are reported in NIES 94 scale, which is related to the WMO CH4 X2004A according to NIES94=WMO+5ppb.The working standard gases are calibrated against primary standard gases at NIES before and after their use. |
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Every chromatogram from the instrument is collected via the data acquisition system and stored as raw data, The data acquisition system also analyze the CH4 peaks and sotred peak informations (peak height, area, and so on). CH4 observations are checked remotly via internet by an operator every day. | |
[Hourly] Hourly data are taken from the arithmetic mean of observed data for one hour after the irregular and evident error data are rejected. [Daily] Daily mean concentrations are calculated by averaging the hourly data obtained during the reported day. [Monthly] Monthly mean concentrations are calculated by averaging the daily data obtained during the reported month. |
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There is no orginal data quality flags. | |
Operational/Reporting | |
The height of the intake is 51 meters above ground level (100 meters above mean sea-level). The air samples are dried first by a Nafion® tube dryer and then by a cold trap (-40 °C). The interval between air sample measurements is 15 minutes for the period from January 1996 to November 1997, and 10 minutes from December 1997. Study of long-term trends in the level of atmospheric CH4, as one of the baseline monitoring stations for the global environmental research and the policy-making communities. |
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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. |
DOI |
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For more information, please refer: doi.org/10.17595/20160901.003 |
Format | Text (WDCGG Data Format Table, WDCGG Meteorological Data Format Table), NetCDF | ||||
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Relation List (Is Part Of) |
All CH4 data contributed to WDCGG by GAW stations and mobiles by 2023-09-13 All CH4 data contributed to WDCGG by GAW stations and mobiles by 2022-09-07 All CH4 data contributed to WDCGG by GAW stations and mobiles by 2021-08-27 All CH4 data contributed to WDCGG by GAW stations and mobiles by 2020-09-28 All CH4 data contributed to WDCGG by GAW stations and mobiles by 2019-09-19 All CH4 data contributed to WDCGG by GAW stations and mobiles by 2018-10-25 |
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Geolocation Point |
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1 | Tohjima et al. (2002), Analysis and presentation of in situ atmospheric methane measurements from Cape Ochi-ishi and Hateruma Island, J. Geophys. Res., 107, 4148, DOI:10.1029/2001JD001003. |
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2 | Tohjima et al. (2014), Temporal changes in the emissions of CH4 and CO from China estimated from CH4/CO2 and CO/CO2 correlations observed at Hateruma Island, Atmos. Chem. Phys., 14, 1663-1677, DOI:10.5194/acp-14-1663-2014. |
3 | Tohjima, Y., Patra, P.K., Niwa, Y., Mukai, H., Sasakawa, M., and Machida, T. Detection of fossil-fuel CO2 plummet in China due to COVID-19 by observation at Hateruma. Sci Rep 10, 18688 (2020). https://doi.org/10.1038/s41598-020-75763-6. |
4 | Tohjima, Y., Niwa, Y., Patra, P. K., Mukai. H., Machida, T., Sasakawa, M., Tsuboi, K., Saito, K., Ito, A. (2023) Near-real-time estimation of fossil fuel CO2 emissions from China based on atmospheric observations at Hateruma and Yonaguni Islands, Japan, Prog Earth Planet Sci 10, 10 (2023). https://doi.org/10.1186/s40645-023-00542-6. |