Dataset Overview | National Centers for Environmental Information (NCEI)

Discrete profile measurements of dissolved inorganic carbon, total alkalinity, pH on total scale and other hydrographic and chemical data obtained during the R/V Mirai cruise in the North Pacific Ocean, East China Sea and Japan Sea on GO-SHIP/CLIVAR Repeat Hydrography Section P03 Leg 3 (EXPOCODE 49NZ20060120) from 2006-01-20 to 2006-01-30 (NCEI Accession 0176230)

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This dataset includes discrete profile measurements of dissolved inorganic carbon (DIC), total alkalinity, pH on total scale, chlorofluorocarbons (CFCs), temperature, salinity, oxygen, nutrients, delta C14, delta C13, and other variables measured during the R/V Mirai cruise in the North Pacific Ocean, East China Sea and Japan Sea on GO-SHIP/CLIVAR Repeat Hydrography Section P03 Leg 3 (EXPOCODE 49NZ20060120) from 2006-01-20 to 2006-01-30.

Dataset Citation

Cite as: Watanabe, Shuichi; Murata, Akihiko; Aoyama, Michio; Kumamoto, Yuichiro; Kawano, Takeshi (2018). Discrete profile measurements of dissolved inorganic carbon, total alkalinity, pH on total scale and other hydrographic and chemical data obtained during the R/V Mirai cruise in the North Pacific Ocean, East China Sea and Japan Sea on GO-SHIP/CLIVAR Repeat Hydrography Section P03 Leg 3 (EXPOCODE 49NZ20060120) from 2006-01-20 to 2006-01-30 (NCEI Accession 0176230). [indicate subset used]. NOAA National Centers for Environmental Information. Dataset. https://doi.org/10.25921/dn8z-p759. Accessed [date].

Dataset Identifiers

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gov.noaa.nodc:0176230

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Distribution Formats	Originator data format
Ordering Instructions	Contact NCEI for other distribution options and instructions.
Distributor	NOAA National Centers for Environmental Information +1-301-713-3277 NCEI.Info@noaa.gov
Dataset Point of Contact	NOAA National Centers for Environmental Information ncei.info@noaa.gov

Time Period	2006-01-20 to 2006-01-30
Spatial Bounding Box Coordinates	West: 125 East: 130.9 South: 26.2 North: 35.3
Spatial Coverage Map

General Documentation

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Associated Resources

CLIVAR Repeat Section P03
- https://www.ncei.noaa.gov/access/ocean-carbon-acidification-data-system/oceans/RepeatSections/clivar_p03.html
  related resource
NOAA National Centers for Environmental Information (2022). Ocean Carbon and Acidification Data System (OCADS). NOAA National Centers for Environmental Information. https://www.ncei.noaa.gov/products/ocean-carbon-acidification-data-system
- https://www.ncei.noaa.gov/products/ocean-carbon-acidification-data-system
  OCADS website

Publication Dates	publication: 2018-09-20
Data Presentation Form	Digital table - digital representation of facts or figures systematically displayed, especially in columns
Dataset Progress Status	Complete - production of the data has been completed Historical archive - data has been stored in an offline storage facility
Data Update Frequency	As needed
Purpose	The goal of this effort is to occupy a set of hydrographic transects over the global ocean with full water column measurements to study physical and hydrographic trends and variability over time
Use Limitations	accessLevel: Public Distribution liability: NOAA and NCEI make no warranty, expressed or implied, regarding these data, nor does the fact of distribution constitute such a warranty. NOAA and NCEI cannot assume liability for any damages caused by any errors or omissions in these data. If appropriate, NCEI can only certify that the data it distributes are an authentic copy of the records that were accepted for inclusion in the NCEI archives.

Dataset Citation	Cite as: Watanabe, Shuichi; Murata, Akihiko; Aoyama, Michio; Kumamoto, Yuichiro; Kawano, Takeshi (2018). Discrete profile measurements of dissolved inorganic carbon, total alkalinity, pH on total scale and other hydrographic and chemical data obtained during the R/V Mirai cruise in the North Pacific Ocean, East China Sea and Japan Sea on GO-SHIP/CLIVAR Repeat Hydrography Section P03 Leg 3 (EXPOCODE 49NZ20060120) from 2006-01-20 to 2006-01-30 (NCEI Accession 0176230). [indicate subset used]. NOAA National Centers for Environmental Information. Dataset. https://doi.org/10.25921/dn8z-p759. Accessed [date].
Cited Authors	Watanabe, Shuichi JAMSTEC; Mutsu Institute for Oceanography (MIO) Murata, Akihiko Aoyama, Michio Kumamoto, Yuichiro Kawano, Takeshi
Principal Investigators	Shuichi Watanabe JAMSTEC; Mutsu Institute for Oceanography (MIO) Akihiko Murata Japan Agency for Marine-Earth Science and Technology (JAMSTEC)
Contributors	Japan Agency for Marine-Earth Science and Technology (JAMSTEC)
Resource Providers	Robert M. Key Princeton University Princeton University
Publishers	NOAA National Centers for Environmental Information
Acknowledgments	Funding Information: JAMSTEC (Ocean General Circulation Observational Research Program)

Theme keywords	NODC DATA TYPES THESAURUS CHLOROFLUOROCARBON (CFC) DELTA CARBON-13 DELTA CARBON-14 DISSOLVED INORGANIC CARBON (DIC) NUTRIENTS pH SALINITY sulfur hexafluoride (SF6) total alkalinity WATER TEMPERATURE NODC OBSERVATION TYPES THESAURUS chemical discrete sample physical profile WMO_CategoryCode oceanography Global Change Master Directory (GCMD) Science Keywords EARTH SCIENCE > ATMOSPHERE > ATMOSPHERIC CHEMISTRY > HALOCARBONS AND HALOGENS > CHLOROFLUOROCARBONS EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > ALKALINITY EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > DISSOLVED GASES EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > HYDROCARBONS EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > INORGANIC CARBON EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > NUTRIENTS EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > PH EARTH SCIENCE > OCEANS > OCEAN TEMPERATURE > WATER TEMPERATURE EARTH SCIENCE > OCEANS > SALINITY/DENSITY > SALINITY OCADS Study Type Discrete measurement Provider Variable Abbreviations ALKALI C14/C13 CFCs/SF6 CTDOXY CTDSAL CTDTMP OXYGEN PH_TOT SALNTY SILCAT, NITRAT, NITRIT PHSPHT TCARBN
Data Center keywords	NODC COLLECTING INSTITUTION NAMES THESAURUS Japan Agency for Marine-Earth Science and Technology NODC SUBMITTING INSTITUTION NAMES THESAURUS Princeton University Global Change Master Directory (GCMD) Data Center Keywords JP/JAMSTEC > Japan Agency for Marine-Earth Science and Technology, Japan
Platform keywords	NODC PLATFORM NAMES THESAURUS R/V MIRAI ICES/SeaDataNet Ship Codes MIRAI (call sign: JNSR, ICES code: 49NZ, 1996)
Instrument keywords	NODC INSTRUMENT TYPES THESAURUS carbon dioxide (CO2) gas analyzer CTD Niskin bottle titrator Global Change Master Directory (GCMD) Instrument Keywords CO2 ANALYZERS > CO2 ANALYZERS CTD > Conductivity, Temperature, Depth NISKIN BOTTLES
Place keywords	NODC SEA AREA NAMES THESAURUS East China Sea (Tung Hai) Japan Sea North Pacific Ocean Global Change Master Directory (GCMD) Location Keywords OCEAN > PACIFIC OCEAN > NORTH PACIFIC OCEAN OCEAN > PACIFIC OCEAN > NORTH PACIFIC OCEAN > SEA OF JAPAN OCEAN > PACIFIC OCEAN > WESTERN PACIFIC OCEAN > EAST CHINA SEA Provider Geographic Names East China Sea Japan Sea North Pacific Ocean
Project keywords	NODC PROJECT NAMES THESAURUS Climate Variability and Predictability (CLIVAR) The Global Ocean Ship-based Hydrographic Investigations Program (GO-SHIP) Cruise ID P03W EXPOCODE 49NZ20060120 Global Change Master Directory (GCMD) Project Keywords CLIVAR > Climate Variability Ocean Acidification Search Keywords Ocean Carbon and Acidification Data System (OCADS) Project Reference Section ID GO-SHIP P03
Keywords	NCEI ACCESSION NUMBER 0176230

Use Constraints	Cite as: Watanabe, Shuichi; Murata, Akihiko; Aoyama, Michio; Kumamoto, Yuichiro; Kawano, Takeshi (2018). Discrete profile measurements of dissolved inorganic carbon, total alkalinity, pH on total scale and other hydrographic and chemical data obtained during the R/V Mirai cruise in the North Pacific Ocean, East China Sea and Japan Sea on GO-SHIP/CLIVAR Repeat Hydrography Section P03 Leg 3 (EXPOCODE 49NZ20060120) from 2006-01-20 to 2006-01-30 (NCEI Accession 0176230). [indicate subset used]. NOAA National Centers for Environmental Information. Dataset. https://doi.org/10.25921/dn8z-p759. Accessed [date].
Access Constraints	Use liability: NOAA and NCEI cannot provide any warranty as to the accuracy, reliability, or completeness of furnished data. Users assume responsibility to determine the usability of these data. The user is responsible for the results of any application of this data for other than its intended purpose.
Fees	In most cases, electronic downloads of the data are free. However, fees may apply for custom orders, data certifications, copies of analog materials, and data distribution on physical media.

Lineage information for: dataset
Processing Steps	2018-09-20T21:50:06Z - NCEI Accession 0176230 v1.1 was published.
Output Datasets	NCEI Accession 0176230 v1.1 NCEI Accession 0176230 v1.1 (download) published 2018-09-20T21:50:06Z

Lineage information for: dataset
Processing Steps	Parameter or Variable: Dissolved Inorganic Carbon; Abbreviation: TCARBN; Unit: UMOL/KG; Observation type: Discrete, bottle; Measured or calculated: Measured; Sampling instrument: Niskin Bottles; Analyzing instrument: Measurements of DIC were made with two total CO2 measuring systems (systems- and -B; Nippon ANS, Inc.), which are slightly different from each other. The systems comprise of a seawater dispensing system, a CO2 extraction system and a coulometer (Model 5012, UIC Inc.).; Detailed sampling and analyzing information: All seawater samples were collected from depths with 12 liter Niskin bottles basically at every other station. The seawater samples for C(T) were taken with a plastic drawing tube (PFA tubing connected to silicone rubber tubing) into a 300 ml borosilicate glass bottle. The glass bottle was filled with seawater smoothly from the bottom following a rinse with a seawater of 2 full bottle volumes. The glass bottle was closed by a stopper, which was fitted to the bottle mouth gravimetrically without additional force. At a chemical laboratory on the ship, a headspace of approximately 1% of the bottle volume was made by removing seawater with a plastic pipette. A saturated mercuric chloride of 100 μl was added to poison seawater samples. The glass bottles were sealed with a greased (Apiezon M, M and Materials Ltd) ground glass stopper and the clips were secured. The seawater samples were kept at 4°C in a refrigerator until analysis. A few hours just before analysis, the seawater samples were kept at 20°C in a water bath.; CRM manufacturer: Andrew Dickson Laboratory at SIO; CRM batch number: The certified values of C(T) for batches 69 and 72 are 1907.63 and 2091.61 μmol kg^-1, respecticely. During the Leg. 2, the pipette of system-B was replaced.; Preservation method: mercuric chloride solution; Uncertainty: accuracy estimated at 2.0umol/kg; Quality flag convention: WOCE quality control flags are used: 2 = good value, 3 = questionable value, 4 = bad value; Method reference: Johnson, K. M., A. G. Dickson, G. Eischeid, C. Goyet, P. Guenther, R. M. Key, F. J. Millero, D. Purkerson, C. L. Sabine, R. G. Schottle, D. W. R. Wallace, R. J. Wilke and C. D. Winn (1998), Coulometric total carbon dioxide analysis for marine studies: assessment of the quality of total inorganic carbon measurements made during the US Indian Ocean CO2 survey 1994-1996, Mar. Chem., 63, 21-37.; Researcher name: Akihiko Murata; Researcher institution: JAMSTEC. Parameter or Variable: Total alkalinity; Abbreviation: ALKALI; Unit: UMOL/KG; Observation type: Discrete, bottle; Measured or calculated: Measured; Sampling instrument: Niskin Bottles; Curve fitting method: Levenberg-Marquardt nonlinear least-squares fit of full titration; Detailed sampling and analyzing information: The measuring system for A(T) (customized by Nippon ANS, Inc.) comprises of a water dispensing unit, an auto-burette (Metrohm), a pH meter (Thermo Orion) and an auto-sampler (6 ports). They are automatically controlled by a PC. Separate electrodes (Reference electrode: REF201, (Radiometer), Glass pH electrode: pHG201-7 (Radiometer)), or combined electrodes (ROSS 8102BN, Thermo Orion) were used. Seawater of approximately 40 ml is transferred from a sample bottle (borosilicate glass bottle; 130 ml) into a water-jacketed (25°C) pressurized by N2 gas and is introduced into a water-jacketed (25°C) titration cell. Next, a given volume of the titrant is injected into the titration cell. By this, pH of a seawater sample becomes 4.5 - 4.0. The seawater sample mixed with the titrant is stirred for three minutes with a stirring chip. Then a small volume of titrant (~0.1 ml) is injected until pH or e.m.f. reaches a given value. The concentration of the acid titrant is nominally 0.05 M HCl in 0.65 M NaCl. Calculation of A(T) is based on a modified Gran approach.; CRM batch number: CRM, batches 69 and 72, certified value = 2114.42 and 2312.79 μmol kg^(-1), respectively; Uncertainty: The average and standard deviation of absolute values of differences in A(T) analyzed consecutively were 2.1 and 1.9 μmol kg^(-1) (n = 123), 1.9 and 1.5 μmol kg^(-1) (n = 203) and 2.2 and 1.9 μmol kg^(-1) (n = 20) for Leg.1, 2 and 3, respectively. To evaluate the accuracy of measured A(T), we compared vertical profiles of A(T) measured in MR05-05 with A(T) calculated from C(T) and pH measured in MR05-05, and with A(T) measured at a station of other WOCE lines crossing the P3 line. Results for cross station with the WOCE P16 line along 153°W are shown in Figure. 3.6.2. From this figure, it is found that A(T) measured in this cruise were sufficiently accurate. Together with other comparisons, we estimated the accuracy to be 3 - 2 μmol kg^(-1).; Quality flag convention: WOCE quality control flags are used: 2 = good value, 3 = questionable value, 4 = bad value; Method reference:; Researcher name: Akihiko Murata; Researcher institution: JAMSTEC. Parameter or Variable: pH; Abbreviation: PH_TOT; pH scale: Total; Observation type: Discrete, bottle; Measured or calculated: Measured; Sampling instrument: Niskin Bottles; Analyzing instrument: spectrophotometry (pH); Temperature of pH measurement: 25 Deg C; Detailed sampling and analyzing information: Measurement of pH was made by a pH measuring system (Nippon ANS, Inc.), which Adopts spectrophotometry. The system comprises of a water dispensing unit and a spectrophotometer (Carry 50 Scan, Varian). Seawater is transferred from borosilicate glass bottle (300 ml) to a sample cell in the spectrophotometer. The length and volume of the cell are 8 cm and 13 ml, respectively, and the sample cell was kept at 25.00 +/- 0.05C in a thermostated compartment. First, absorbance of seawater only is measured at three wavelengths (730, 578 and 434 nm). Then an indicator is injected and circulated for about 4 minutes to mix with seawater sufficiently. After the pump is stopped, the absorbance of seawater + indicator is measured at the same wavelengths.; At what temperature was pH reported: at 25C; Uncertainty: The average and standard deviation of absolute values of differences of pH analyzed consecutively were 0.0007 and 0.0012 pH unit (n = 163), 0.0007 and 0.0006 pH unit (n = 255), and 0.0009 and 0.0009 (n = 36) for Leg.1, 2 and 3, respectively.; Quality flag convention: WOCE quality control flags are used: 2 = good value, 3 = questionable value, 4 = bad value; Method reference: Clayton, T.D., and R.H. Byrne, 1993: Spectrophotometric seawater pH measurements: Total hydrogen ion concentration scale calibration of m-cresol purple and at-sea results. Deep-Sea Res., 40, 2315-2329.; Researcher name: Akihiko Murata; Researcher institution: JAMSTEC. Parameter or Variable: CTD Temperature; Abbreviation: CTDTMP; Unit: degrees celcius; Observation type: CTD sensor; Sampling instrument: CTD; Analyzing instrument: CTD; Quality flag convention: WOCE quality control flags are used: 2 = good value, 3 = questionable value, 4 = bad value; Researcher name: Shuichi Watanabe; Researcher institution: JAMSTEC. Parameter or Variable: CTD Salinity; Abbreviation: CTDSAL; Observation type: CTD sensor; Sampling instrument: CTD; Analyzing instrument: CTD; Quality flag convention: WOCE quality control flags are used: 2 = good value, 3 = questionable value, 4 = bad value; Researcher name: Shuichi Watanabe; Researcher institution: JAMSTEC. Parameter or Variable: Bottle Salinity; Abbreviation: SALNTY; Observation type: Bottle, discrete; Sampling instrument: CTD; Quality flag convention: WOCE quality control flags are used: 2 = good value, 3 = questionable value, 4 = bad value; Researcher name: T. Kawano; Researcher institution: JAMSTEC. Parameter or Variable: CTD Oxygen; Abbreviation: CTDOXY; Unit: UMOL/KG; Observation type: CTD sensor; Sampling instrument: CTD; Quality flag convention: WOCE quality control flags are used: 2 = good value, 3 = questionable value, 4 = bad value; Researcher name: Shuichi Watanabe; Researcher institution: JAMSTEC. Parameter or Variable: Bottle Oxygen; Abbreviation: OXYGEN; Unit: UMOL/KG; Observation type: Bottle, discrete; Sampling instrument: CTD; Quality flag convention: WOCE quality control flags are used: 2 = good value, 3 = questionable value, 4 = bad value; Researcher name: Y.Kumamoto; Researcher institution: JAMSTEC. Parameter or Variable: Nutrients; Abbreviation: SILCAT, NITRAT, NITRIT PHSPHT; Unit: UMOL/KG; Observation type: Bottle, discrete; Sampling instrument: CTD; Quality flag convention: WOCE quality control flags are used: 2 = good value, 3 = questionable value, 4 = bad value; Researcher name: M. Aoyama; Researcher institution: JAMSTEC. Parameter or Variable: Chlorofluorocarbons; Abbreviation: CFCs/SF6; Unit: PMOL/KG; Observation type: Bottle, discrete; Sampling instrument: CTD; Quality flag convention: WOCE quality control flags are used: 2 = good value, 3 = questionable value, 4 = bad value. Parameter or Variable: C14, C13; Abbreviation: C14/C13; Unit: /MILLE; Observation type: Bottle, discrete; Sampling instrument: CTD; Quality flag convention: WOCE quality control flags are used: 2 = good value, 3 = questionable value, 4 = bad value .

Lineage information for: dataset

Processing Steps

Parameter or Variable: Dissolved Inorganic Carbon; Abbreviation: TCARBN; Unit: UMOL/KG; Observation type: Discrete, bottle; Measured or calculated: Measured; Sampling instrument: Niskin Bottles; Analyzing instrument: Measurements of DIC were made with two total CO2 measuring systems (systems- and -B; Nippon ANS, Inc.), which are slightly different from each other. The systems comprise of a seawater dispensing system, a CO2 extraction system and a coulometer (Model 5012, UIC Inc.).; Detailed sampling and analyzing information: All seawater samples were collected from depths with 12 liter Niskin bottles basically at every other station. The seawater samples for C(T) were taken with a plastic drawing tube (PFA tubing connected to silicone rubber tubing) into a 300 ml borosilicate glass bottle. The glass bottle was filled with seawater smoothly from the bottom following a rinse with a seawater of 2 full bottle volumes. The glass bottle was closed by a stopper, which was fitted to the bottle mouth gravimetrically without additional force. At a chemical laboratory on the ship, a headspace of approximately 1% of the bottle volume was made by removing seawater with a plastic pipette. A saturated mercuric chloride of 100 μl was added to poison seawater samples. The glass bottles were sealed with a greased (Apiezon M, M and Materials Ltd) ground glass stopper and the clips were secured. The seawater samples were kept at 4°C in a refrigerator until analysis. A few hours just before analysis, the seawater samples were kept at 20°C in a water bath.; CRM manufacturer: Andrew Dickson Laboratory at SIO; CRM batch number: The certified values of C(T) for batches 69 and 72 are 1907.63 and 2091.61 μmol kg^-1, respecticely. During the Leg. 2, the pipette of system-B was replaced.; Preservation method: mercuric chloride solution; Uncertainty: accuracy estimated at 2.0umol/kg; Quality flag convention: WOCE quality control flags are used: 2 = good value, 3 = questionable value, 4 = bad value; Method reference: Johnson, K. M., A. G. Dickson, G. Eischeid, C. Goyet, P. Guenther, R. M. Key, F. J. Millero, D. Purkerson, C. L. Sabine, R. G. Schottle, D. W. R. Wallace, R. J. Wilke and C. D. Winn (1998), Coulometric total carbon dioxide analysis for marine studies: assessment of the quality of total inorganic carbon measurements made during the US Indian Ocean CO2 survey 1994-1996, Mar. Chem., 63, 21-37.; Researcher name: Akihiko Murata; Researcher institution: JAMSTEC.
Parameter or Variable: Total alkalinity; Abbreviation: ALKALI; Unit: UMOL/KG; Observation type: Discrete, bottle; Measured or calculated: Measured; Sampling instrument: Niskin Bottles; Curve fitting method: Levenberg-Marquardt nonlinear least-squares fit of full titration; Detailed sampling and analyzing information: The measuring system for A(T) (customized by Nippon ANS, Inc.) comprises of a water dispensing unit, an auto-burette (Metrohm), a pH meter (Thermo Orion) and an auto-sampler (6 ports). They are automatically controlled by a PC. Separate electrodes (Reference electrode: REF201, (Radiometer), Glass pH electrode: pHG201-7 (Radiometer)), or combined electrodes (ROSS 8102BN, Thermo Orion) were used. Seawater of approximately 40 ml is transferred from a sample bottle (borosilicate glass bottle; 130 ml) into a water-jacketed (25°C) pressurized by N2 gas and is introduced into a water-jacketed (25°C) titration cell. Next, a given volume of the titrant is injected into the titration cell. By this, pH of a seawater sample becomes 4.5 - 4.0. The seawater sample mixed with the titrant is stirred for three minutes with a stirring chip. Then a small volume of titrant (~0.1 ml) is injected until pH or e.m.f. reaches a given value. The concentration of the acid titrant is nominally 0.05 M HCl in 0.65 M NaCl. Calculation of A(T) is based on a modified Gran approach.; CRM batch number: CRM, batches 69 and 72, certified value = 2114.42 and 2312.79 μmol kg^(-1), respectively; Uncertainty: The average and standard deviation of absolute values of differences in A(T) analyzed consecutively were 2.1 and 1.9 μmol kg^(-1) (n = 123), 1.9 and 1.5 μmol kg^(-1) (n = 203) and 2.2 and 1.9 μmol kg^(-1) (n = 20) for Leg.1, 2 and 3, respectively. To evaluate the accuracy of measured A(T), we compared vertical profiles of A(T) measured in MR05-05 with A(T) calculated from C(T) and pH measured in MR05-05, and with A(T) measured at a station of other WOCE lines crossing the P3 line. Results for cross station with the WOCE P16 line along 153°W are shown in Figure. 3.6.2. From this figure, it is found that A(T) measured in this cruise were sufficiently accurate. Together with other comparisons, we estimated the accuracy to be 3 - 2 μmol kg^(-1).; Quality flag convention: WOCE quality control flags are used: 2 = good value, 3 = questionable value, 4 = bad value; Method reference:; Researcher name: Akihiko Murata; Researcher institution: JAMSTEC.
Parameter or Variable: pH; Abbreviation: PH_TOT; pH scale: Total; Observation type: Discrete, bottle; Measured or calculated: Measured; Sampling instrument: Niskin Bottles; Analyzing instrument: spectrophotometry (pH); Temperature of pH measurement: 25 Deg C; Detailed sampling and analyzing information: Measurement of pH was made by a pH measuring system (Nippon ANS, Inc.), which Adopts spectrophotometry. The system comprises of a water dispensing unit and a spectrophotometer (Carry 50 Scan, Varian). Seawater is transferred from borosilicate glass bottle (300 ml) to a sample cell in the spectrophotometer. The length and volume of the cell are 8 cm and 13 ml, respectively, and the sample cell was kept at 25.00 +/- 0.05C in a thermostated compartment. First, absorbance of seawater only is measured at three wavelengths (730, 578 and 434 nm). Then an indicator is injected and circulated for about 4 minutes to mix with seawater sufficiently. After the pump is stopped, the absorbance of seawater + indicator is measured at the same wavelengths.; At what temperature was pH reported: at 25C; Uncertainty: The average and standard deviation of absolute values of differences of pH analyzed consecutively were 0.0007 and 0.0012 pH unit (n = 163), 0.0007 and 0.0006 pH unit (n = 255), and 0.0009 and 0.0009 (n = 36) for Leg.1, 2 and 3, respectively.; Quality flag convention: WOCE quality control flags are used: 2 = good value, 3 = questionable value, 4 = bad value; Method reference: Clayton, T.D., and R.H. Byrne, 1993: Spectrophotometric seawater pH measurements: Total hydrogen ion concentration scale calibration of m-cresol purple and at-sea results. Deep-Sea Res., 40, 2315-2329.; Researcher name: Akihiko Murata; Researcher institution: JAMSTEC.
Parameter or Variable: CTD Temperature; Abbreviation: CTDTMP; Unit: degrees celcius; Observation type: CTD sensor; Sampling instrument: CTD; Analyzing instrument: CTD; Quality flag convention: WOCE quality control flags are used: 2 = good value, 3 = questionable value, 4 = bad value; Researcher name: Shuichi Watanabe; Researcher institution: JAMSTEC.
Parameter or Variable: CTD Salinity; Abbreviation: CTDSAL; Observation type: CTD sensor; Sampling instrument: CTD; Analyzing instrument: CTD; Quality flag convention: WOCE quality control flags are used: 2 = good value, 3 = questionable value, 4 = bad value; Researcher name: Shuichi Watanabe; Researcher institution: JAMSTEC.
Parameter or Variable: Bottle Salinity; Abbreviation: SALNTY; Observation type: Bottle, discrete; Sampling instrument: CTD; Quality flag convention: WOCE quality control flags are used: 2 = good value, 3 = questionable value, 4 = bad value; Researcher name: T. Kawano; Researcher institution: JAMSTEC.
Parameter or Variable: CTD Oxygen; Abbreviation: CTDOXY; Unit: UMOL/KG; Observation type: CTD sensor; Sampling instrument: CTD; Quality flag convention: WOCE quality control flags are used: 2 = good value, 3 = questionable value, 4 = bad value; Researcher name: Shuichi Watanabe; Researcher institution: JAMSTEC.
Parameter or Variable: Bottle Oxygen; Abbreviation: OXYGEN; Unit: UMOL/KG; Observation type: Bottle, discrete; Sampling instrument: CTD; Quality flag convention: WOCE quality control flags are used: 2 = good value, 3 = questionable value, 4 = bad value; Researcher name: Y.Kumamoto; Researcher institution: JAMSTEC.
Parameter or Variable: Nutrients; Abbreviation: SILCAT, NITRAT, NITRIT PHSPHT; Unit: UMOL/KG; Observation type: Bottle, discrete; Sampling instrument: CTD; Quality flag convention: WOCE quality control flags are used: 2 = good value, 3 = questionable value, 4 = bad value; Researcher name: M. Aoyama; Researcher institution: JAMSTEC.
Parameter or Variable: Chlorofluorocarbons; Abbreviation: CFCs/SF6; Unit: PMOL/KG; Observation type: Bottle, discrete; Sampling instrument: CTD; Quality flag convention: WOCE quality control flags are used: 2 = good value, 3 = questionable value, 4 = bad value.
Parameter or Variable: C14, C13; Abbreviation: C14/C13; Unit: /MILLE; Observation type: Bottle, discrete; Sampling instrument: CTD; Quality flag convention: WOCE quality control flags are used: 2 = good value, 3 = questionable value, 4 = bad value .

Acquisition Information (collection)
Instrument	carbon dioxide (CO2) gas analyzer CTD Niskin bottle titrator
Platform	R/V MIRAI

Last Modified: 2024-03-08T13:20:29Z
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