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 Organization

NO 70
Acronym TU
Name Tohoku University
Address 1 Center for Atmospheric and Oceanic Studies
Address 2 6-3 Aoba, Aramaki, Aoba-ku
Address 3 Sendai 980-8578
Country/Territory Japan
Website http://tgr.gp.tohoku.ac.jp

 Contact(s)

Name Shuji Aoki
Prefix Prof.
Email saoki@tohoku.ac.jp
Organization No 70
Organization acronym TU
Organization name Tohoku University
Organization country/territory Japan
Address 1
Address 2
Address 3 Aoba 6-3, Aramaki, Aoba-ku, Sendai 980-8578
Country/territory Japan
Tel +81-22-795-5792
Fax +81-22-795-5797
Last updated date 2020-06-24


Name Shinji Morimoto
Prefix Prof.
Email mon@tohoku.ac.jp
Organization No 70
Organization acronym TU
Organization name Tohoku University
Organization country/territory Japan
Address 1
Address 2
Address 3 Aoba 6-3, Aramaki, Aoba-ku, Sendai 980-8578
Country/territory Japan
Tel +81-22-795-5780
Fax +81-22-795-5797
Last updated date 2020-10-06


 Background observation
 UTC+09:00
 ppm
 9999-12-31 00:00:00 - 9999-12-31 23:59:59: Tohoku University 2010
 9999-12-31 00:00:00 - 9999-12-31 23:59:59: A NDIR analyzer used was VIA-500R which was produced by Horiba, Co. Ltd. Japan.(NDIR)
 9999-12-31 00:00:00 - 9999-12-31 23:59:59: NA (m)
 fortnightly
 The CO2 concentrations of the working standards were calibrated using the secondary standard gases of which concentrations were determined against the primary standard gas system. The primary standards were prepared gravimetrically with uncertainties of 0.13 ppm.
The CO2 concentration of each air sample was usually determined using three air-based working standard gases with known CO2 concentrations.
 Two flask data collected each day were first averaged to obtain daily mean CO2 concentration, and then the best fit curve to the daily means were derived by using a digital filtering technique. Any data lying out side 3 sigma were regarded as outliers and excluded from the record. This procedure was repeated until no outliers were identified.
 [Hourly]
 [Daily]
 [Monthly]
 
 Valid: ...
 Terminated
 The air sampling was made aboard a ferry, so that contamination could come from the ship itself.
The analytical precision of the NDIR was estimated to be 0.01 ppm.
An air intake was set on the windward wing of the bridge located at the stem, and the bridge doors were closed to prevent contamination from the ship itself. An air sample was pressurized into a 350-ml stainless-steel flask to about 0.35 MPa by using an electric diaphragm pump. Water vapor was removed by forcing the air through magnesium perchlorate.
Scientific Aim is to detect changes in the natural and anthropogenic emissions of CO2 over the Asian Continent.
 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:
Meteorological data may remain as first provded, even when greenhouse gas data are updated.
 
1  Zhang et al. (2007), Temporal variations of atmospheric carbon dioxeide in the southernmost part of Japan, Tellus, 59B, 654-663.