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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 Taku Umezawa
Prefix
Email umezawa.taku@nies.go.jp
Organization No 53
Organization acronym NIES
Organization name National Institute for Environmental Studies
Organization country/territory Japan
Address 1
Address 2
Address 3
Country/territory Japan
Tel
Fax
Last updated date 2020-10-06


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


 Unknown
 UTC+09:00
 ppb
 9999-12-31 00:00:00 - 9999-12-31 23:59:59: Tohoku University
 9999-12-31 00:00:00 - 2000-12-31 23:59:59: GC-9A (Shimadzu Corp.)(Gas chromatography (FID))
 2001-01-01 00:00:00 - 9999-12-31 23:59:59: Agilent 6890 (Agilent Technologies, Inc.)(Gas chromatography (FID))
 event
 The CH4 concentration in each flask was determined against our working standard gases calibrated on the Tohoku University scale.
The Tohoku University scale is based on primary standard gases prepared with uncertainty of 1 ppb using a gravimetrical method with four dilution stages (Aoki et al., 1992). We confirmed by regularly performing an intercalibration of our standard gases that our scale has been stable within our analytical repeatability for the period covered by the present observation programs. We have participated the WMO Round Robin intercomparison programme. See Umezawa et al. (2014).
 
 [Hourly]
 [Daily]
 [Monthly]
 This dataset include a flag for reliability of the sampling position as follows.
0: calculated based on the aircraft indicators and obviously reasonable.
1: same as 0, but obviously unreasonable.
2: interpolated based on the previous/following positions.
3: air-sampling positions were assigned along the reference route connecting Sendai and Fukuoka airports based on the sampling time.
4: Same as 3, but the sampling time was also assumed since the original record was lost.
Contact to the contirbutors for more information.
 Operational/Reporting
 Air samples were collected on board commercial jet airlines (McDonnell- Douglas MD-80 and MD-90) between Sendai (38.13° N, 140.92° E) and Fukuoka (33.58° N, 130.45° E) airports, which were operated by Japan Air Systems (the former Toa Domestic Airlines) until 2004 and then by Japan Airlines. Outside air, which is introduced into the cockpit through an air-conditioning system of the aircraft, was collected at ~0.3 MPa above the cockpit pressure into a 350 mL stainless-steel flask by using a manual plunger pump developed at Tohoku University. Air sampling positions and altitudes were recorded from flight instruments of the aircraft. During a set of outbound and returning flights, 20 air samples were collected. See Umezawa et al. (2014).
 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  Umezawa, T., D. Goto, S. Aoki, K. Ishijima, P. K. Patra, S. Sugawara, S. Morimoto and T. Nakazawa, Variations of tropospheric methane over Japan during 1988-2010, Tellus B, 66, 23837, doi:10.3402/tellusb.v66.23837, 2014.
2  Aoki, S., T. Nakazawa, S. Murayama, and S. Kawaguchi, Measurements of atmospheric methane at the Japanese Antarctic Station, Syowa. Tellus B, 44, 273-281. DOI: 10.1034/j.1600- 0889.1992.t01-3-00005.x, 1992.