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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.
Email 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.4622)
Fax
Last updated date 2021-06-24


Name KADONO Koji
Prefix Mr.
Email 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.4621)
Fax
Last updated date 2021-06-24


 Background observation
 UTC+09:00
 μmol/kg
 2010-04-01 00:00:00 - 9999-12-31 23:59:59: Japan ANS, SEACAT2000(Coulometry)
 9999-12-31 00:00:00 - 9999-12-31 23:59:59: NA (m)
 event
 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
 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 minute, 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).

Until July 1997, analyzer was calibrated from the analyses result of four sodium carbonate solutions whose concentration were known.
 [Hourly]
 [Daily]
 [Monthly]
 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.
 Invalid: 1
 Valid: 2
 Valid: 3
 Invalid: 4
 Invalid: 5
 Valid: 6
 Invalid: 9
 Operational/Reporting
 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.

Until July 1997, TIC was analysed using different procedure.
Samples were drawn from water sample bottle into glass tube (outer diameter approx. 20mm and the length approx. 10cm). The sample tube was sealed with parafin film.
1ml of sample was introduced into the analyzer (TOC-5000, Shimadzu) and injected into the 8% phosphoric acid solution in the CO2 extricating cell. CO2 gas from the cell was dehumidified using thermoelectric cooling unit (1 °C), and was sent sent to NDIR sensor. The output of sensor was integrated and the peak area was recorded.
 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 provided, even when greenhouse gas data are updated.
 
No DOI available

 Related information

Format Text (WDCGG Data Format Table, WDCGG Meteorological Data Format Table), NetCDF
Relation List (Is Part Of) All TIC data contributed to WDCGG by GAW stations and mobiles by 2020-06-08
All TIC data contributed to WDCGG by GAW stations and mobiles by 2019-05-07
All TIC data contributed to WDCGG by GAW stations and mobiles by 2018-08-03

 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.
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.