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Organization
| NO | 1 |
|---|---|
| Acronym | JMA |
| Name | Japan Meteorological Agency |
| Address 1 | |
| Address 2 | |
| Address 3 | 3-6-9 Toranomon, Minato City, Tokyo 105-8431 |
| Country/Territory | Japan |
| Website | https://www.jma.go.jp/jma/indexe.html |
Contact(s)
| Name | ENYO Kazutaka |
|---|---|
| Prefix | Mr. |
| seadata@met.kishou.go.jp | |
| Organization No | 1 |
| Organization acronym | JMA |
| Organization name | Japan Meteorological Agency |
| Organization country/territory | Japan |
| Address 1 | Atmosphere and Ocean Department |
| Address 2 | Atmospheric Environment and Ocean Division |
| Address 3 | 3-6-9 Toranomon, Minato City, Tokyo 105-8431 |
| Country/territory | Japan |
| Tel | +81-3-6758-3900 (ex.4619) |
| Fax | |
| Last updated date | 2024-06-27 |
| Background observation | |
| UTC+09:00 | |
| μmol/kg | |
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9999-12-31 00:00:00 - 2010-03-31 23:59:59: UIC Inc., CM5012(Coulometry) 2010-04-01 00:00:00 - 9999-12-31 23:59:59: Japan ANS, SEACAT2000(Coulometry) |
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9999-12-31 00:00:00 - 9999-12-31 23:59:59: NA (m) |
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The introduction order of samples obtained at an observation station was as follows. 1: Purified nitrogen gas (blank) 2: Standard gas and purified nitrogen gas (performance test of coulometer) 3: Phosphoric acid (blank) 4: Seawater for conditioning 5: Reference seawater made at JMA 6: Certified Reference Material 7: Seawater samples from depths 8: Certified Reference Material |
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Concentration of TIC (CT) in micro moles per kilogram of seawater (umol/kg) was calculated from equation (1): CT = NS / (c VS rho_S), (1) where NS is the net counts of coulometer, c is the coulometer calibration factor, i.e., the counts of coulometer per mole of carbon, VS is the sample volume (volume of pipette), and rho_S is the density of seawater that is calculated from the salinity of sample and its temperature in the pipette. Net counts of coulometer, NS, is the counts for sample at 10 minutes after starting CO2 extraction/titration (N10) subtracted by background count level, NB, per 10 minutes, i.e., NS = N10 – NB. (2) Background count levels were measured once every five sample measurements. We evaluated this using equation (3) from the increase of coulometer count from 10 minutes (N10) to 15 minutes (N15) after starting CO2 extraction/titration when CO2 in sample seawater is expected to have been completely evolved. NB = (N15 – N10) 10 / (15－10) (3) c VS was calibrated from alanytical results of Certified Reference Materials provided by Dr. A.G. Dickson at Scripps Institution of Oceanography, substituting certified value for CT in equation (1). |
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[Hourly] [Daily] [Monthly] |
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Flag information 1: Sample was drawn from water bottle but the data was not finalized. 2: Acceptable measurement. 3: Questionable measurement. 4: Bad measurement. 5: Not reported due to sample lost or contaminated. 6: Mean of replicate measurement (Number of replicates was 2). 9: Sample not drawn for this measurement from water bottle. |
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Invalid: 9 Invalid: 1 Valid: 2 Valid: 3 Invalid: 4 Invalid: 5 Valid: 6 |
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| Operational/Reporting | |
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Samples for the measurements of TIC were drawn according to the procedures outlined by Dickson et al. (2007) from 10-litters Niskin bottles into clean 300 cm3 Schott Duran(TM) borosilicate glass bottles using silicone tubing. Schott Duran (TM) glass bottles were filled smoothly from the bottom after overflowing double a volume while taking care of not entraining any bubbles. After creating 2 cm3 of headspace by removing sample to allow thermal expansion, 0.2 cm3 of saturated mercury (II) chloride solution was added to the samples as a preservative. Then the sample bottles were sealed with ground glass stoppers lubricated with Apiezon(TM) grease (L). Multiplying 1.00067 (= 300.02 / 300.00), changes in TIC induced by the addition of saturated mercury (II) chloride solution were corrected for the dilution effect. Samples were immersed in a thermostated water bath (25.0 °C) for approx. 1 hour prior to analysis. Automated procedure of analyses was as follows. (a) Approximately 2 cm3 of 20% v/v phosphoric acid was injected to an “extraction chamber”, i.e., a glass tube (approx. 20 mm outer diameter and 20 cm in length) with a course glass frit placed near the bottom. Purified N2 (Japan Fine Products, G1 grade >99.99995%) was then allowed to flow through the extraction chamber for 2 minutes to purge CO2 and other volatile acids dissolved in the phosphoric acid. (b) A portion of sample seawater was delivered from the sample bottle into the sample pipette of CO2 extraction unit by pressurizing the headspace in the sample bottle. After temperature of the pipette was recorded, the sample seawater was transferred into the extraction chamber and mixed with phosphoric acid to convert all carbonate species to CO2 (aq). (c) The acidified sample seawater was then stripped of CO2 with a stream of purified N2 (130 cm3/min) for 10 minutes. After being dehumidified in a series of two thermoelectric cooling units (2 °C), the evolved CO2 in the N2 stream was introduced into the carbon cathode solution in the coulometric titration cell and then CO2 was electrically titrated. |
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Wind direction: 1 Wind speed: 1 Relative humidity: 1 Precipitation amount: 0 Air pressure: 1 Air temperature: 1 Dew point temperature: 1 Sea water temperature: 1 Sea surface water temperature: 1 Sea water salinity: 1 Sea surface water salinity: 1 |
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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.
ENYO Kazutaka (JMA),
Oceanic TIC
by Keifu Maru, R/V, Japan Meteorological Agency,
dataset published as TIC_KEF_
ship-bottle_JMA_sea-sampling at WDCGG,
ver. 2024-06-27-0301 (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 | Dickson, A. G., Sabine, C. L. and Christian, J. R. (Eds.) (2007),: Guide to best practices for ocean CO2 measurements. PICES Special Publication 3, 191 pp. |
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| 2 | Ishii, M., Inoue, H.Y. and Matsueda, H. (2000): Coulometric Precise Analysis of Total Inorganic Carbon in Seawater and Measurements of Radiocarbon for the Carbon Dioxide in the Atmosphere and for the Total Inorganic Carbon in Seawater, Technical Reports of the Meteorological Research Institutte, No.41, 64 pp. |
