In line with the GAW Data Policy, users should contact the contributors of all data of interest and propose co-authorship or acknowledgement.
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 | Shinji Morimoto |
|---|---|
| Prefix | Prof. |
| 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 | 2024-10-04 |
| Background observation | |
| UTC+09:00 | |
| ppm | |
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9999-12-31 00:00:00 - 9999-12-31 23:59:59: Tohoku University 2010 |
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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) |
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9999-12-31 00:00:00 - 9999-12-31 23:59:59: NA (m) |
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| fortnightly | |
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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. |
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| 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. | |
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[Hourly] [Daily] [Monthly] |
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Valid: ... |
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| Terminated | |
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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. |
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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. |
No DOI available
Related information
GAW Data Policy
"For Scientific purposes, access to these data is unlimited and provided without charge.
By their use you accept that an offer of co-authorship will be made through personal contact with the data providers
or owners whenever substantial use is made of their data.
In all cases, an acknowledgement must be made to the data providers or owners and to the data centre when these data are used within a publication."
Citation format
This format is an example of the WDCGG standard citation.
Please follow the citation format which the data providers or owners indicate.
Please follow the citation format which the data providers or owners indicate.
Shinji Morimoto (TU),
Atmospheric CO2
by Ship between Ishigaki Island and Hateruma Island, Tohoku University,
dataset published as CO2_SIH_
ship-flask_TU_data1 at WDCGG,
ver. 2023-12-12-0947 (Reference date*: YYYY/MM/DD)
* As the reference date, please indicate the date you downloaded the files.
* As the reference date, please indicate the date you downloaded the files.
Reference(s)
| 1 | Zhang et al. (2007), Temporal variations of atmospheric carbon dioxeide in the southernmost part of Japan, Tellus, 59B, 654-663. |
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