Dissolved inorganic carbon (DIC), total alkalinity, pH on total scale, chlorofluorocarbons (CFC11, CFC12), temperature, salinity, dissolved oxygen, nutrients and other hydrographic and chemical variables collected from discrete samples and profile observations during the R/V Thomas G. Thompson cruise GO-SHIP_I06S (EXPOCODE 325020190403) in the Southern and Indian Oceans from 2019-04-03 to 2019-05-14 (NCEI Accession 0209630)
INVESTIGATORS:
Alejandro Orsi
- Texas A&M University (TAMU)
Rik Wanninkhof 
- NOAA Atlantic Oceanographic and Meteorological Laboratory (AOML)
- NOAA Atlantic Oceanographic and Meteorological Laboratory (AOML)
Richard A. Feely
- NOAA Pacific Marine Environmental Laboratory (PMEL)
- NOAA Pacific Marine Environmental Laboratory (PMEL)
Andrew G. Dickson
- Scripps Institution of Oceanography (SIO)
Dennis A. Hansell
- Division of Marine and Atmospheric Chemistry, Rosenstiel School of Marine and Atmospheric Science University of Miami 4600 Rickenbacker Causeway Miami, FL 33149, USA
- Division of Marine and Atmospheric Chemistry, Rosenstiel School of Marine and Atmospheric Science University of Miami 4600 Rickenbacker Causeway Miami, FL 33149, USAPACKAGE DESCRIPTION: This dataset includes discrete profile measurements of dissolved inorganic carbon (DIC), total alkalinity, pH on total scale, temperature, salinity, dissolved oxygen, nutrients, chlorofluorocarbons (CFC11, CFC12) and other hydrographic and chemical measurements obtained during R/V Thomas G. Thompson cruise GO-SHIP_I06S (EXPOCODE 325020190403) in the Southern and Indian Oceans from 2019-04-03 to 2019-05-14. The U.S. GO-SHIP I6S 2019 hydrographic section revisited this intercontinental line after its first occupation in 2008, itself a repeat of the original 1996 WOCE transect by France.
CITE AS: Orsi, Alejandro; Wanninkhof, Rik; Feely, Richard A.; Greeley, Dana; Dickson, Andrew G.; Min, Dong-Ha; Swift, James H.; Becker, Susan; Hansell, Dennis A.; McNichol, Ann; Key, Robert M. (2020). Dissolved inorganic carbon (DIC), total alkalinity, pH on total scale, chlorofluorocarbons (CFC11, CFC12), temperature, salinity, dissolved oxygen, nutrients and other hydrographic and chemical variables collected from discrete samples and profile observations during the R/V Thomas G. Thompson cruise GO-SHIP_I06S (EXPOCODE 325020190403) in the Southern and Indian Oceans from 2019-04-03 to 2019-05-14 (NCEI Accession 0209630). [indicate subset used]. NOAA National Centers for Environmental Information. Dataset. https://doi.org/10.25921/v20y-7221. Accessed [date].
IDENTIFICATION INFORMATION FOR THIS DATA PACKAGE:
NCEI ACCESSION: 0209630
NCEI DOI: https://doi.org/10.25921/v20y-7221
EXPOCODE: 325020190403;
CRUISE ID: TN366, SOCCOM;
SECTION/LEG: GO-SHIP I06S;
TYPES OF STUDY:
Discrete measurement;Profile;
TEMPORAL COVERAGE:
SPATIAL COVERAGE:
GEOGRAPHIC NAMES:
PLATFORMS:
RESEARCH PROJECT(S):
Discrete measurement;Profile;
TEMPORAL COVERAGE:
START DATE: 2019-04-03
END DATE: 2019-05-14
SPATIAL COVERAGE:
NORTH: -33.234
WEST: 28.095
EAST: 31.534
SOUTH: -68.6
GEOGRAPHIC NAMES:
Southern Ocean;Indian Ocean;
PLATFORMS:
R/V Thomas G. Thompson (ID: 3250);
RESEARCH PROJECT(S):
The Global Ocean Ship-based Hydrographic Investigations Program (GO-SHIP);
VARIABLES / PARAMETERS:
| Dissolved Inorganic Carbon | |
|---|---|
| Abbreviation: | TCARBN |
| Unit: | UMOL/KG |
| Observation type: | Discrete, bottle |
| Measured or calculated: | Measured |
| Sampling instrument: | Niskin Bottles |
| Analyzing instrument: | coulometry with two analytical systems (AOML 3 and AOML 4) |
| Detailed sampling and analyzing information: | Samples for DIC measurements were drawn (according to procedures outlined in the PICES Publication, Guide to Best Practices for Ocean CO2 Measurements [Dickson2007]) from Niskin bottles into 294 ml borosilicate glass bottles using silicone tubing. The flasks were rinsed once and filled from the bottom with care not to entrain any bubbles, overflowing by at least one-half volume. The sample tube was pinched off and withdrawn, creating a 6 ml headspace, followed by 0.16 ml of saturated HgCl2 solution which was added as a preservative. The sample bottles were then sealed with glass stoppers lightly covered with Apiezon-L grease and were stored at room temperature for a maximum of 12 hours. |
| Standardization description: | The accuracy of the DICE measurement is determined with the use of standards (Certified Reference Materials (CRMs), consisting of filtered and UV irradiated seawater) supplied by Dr. A. Dickson of Scripps Institution of Oceanography (SIO). The CRM accuracy is determined manometrically on land in San Diego and the DIC data re-ported to the data base have been corrected to this batch 178 CRM value. The CRM certified value for this batch is 1952.62 µmol/kg. |
| Standardization frequency: | Daily |
| CRM manufacturer: | Andrew Dickson Laboratory at SIO |
| CRM batch number: | 178 and 180 |
| Preservation method: | Mercuric chloride solution |
| Preservative volume: | 200 μL |
| Uncertainty: | The accuracy of the DICE measurement is determined with the use of standards (Certified Reference Materials (CRMs), consisting of filtered and UV irradiated seawater) supplied by Dr. A. Dickson of Scripps Institution of Oceanography (SIO). The CRM accuracy is determined manometrically on land in San Diego and the DIC data re-ported to the data base have been corrected to this batch 178 CRM value. The CRM certified value for this batch is 1952.62 µmol/kg. |
| Quality flag convention: | WOCE quality control flags are used: 2 = good value, 3 = questionable value, 4 = bad value |
| Method reference: | Guide to Best Practices for Ocean CO2 Measurements [Dickson2007]) |
| Researcher name: | Rik Wanninkhoff, Dana Greely |
| Researcher institution: | NOAA/PMEL/AOML |
| Total alkalinity | |
|---|---|
| Abbreviation: | ALKALI |
| Unit: | UMOL/KG |
| Observation type: | Discrete, bottle |
| Measured or calculated: | Measured |
| Sampling instrument: | Niskin Bottles |
| Type of titration: | Potentiometric |
| Cell type (open or closed): | Open |
| Detailed sampling and analyzing information: | Samples are dispensed using a Sample Delivery System (SDS) consisting of a volumetric pipette, various relay valves, and two air pumps controlled by LabVIEW 2012. Before filling the jacketed cell with a new sample for analysis, the volumetric pipette is cleared of any residual from the previous sample with the aforementioned air pumps. The pipette is then rinsed with new sample and filled, allowing for overflow and time for the sample temperature to equilibrate. The sample bottle temperature is measured using a DirecTemp thermistor probe inserted into the sample bottle and the volumetric pipette temperature is measured using a DirecTemp surface probe placed directly on the pipette. These temperature measurements are used to convert the sample volume to mass for analysis. Samples are analyzed using an open cell titration procedure using two 250 mL jacketed cells. One sample is un-dergoing titration while the second is being prepared and equilibrating to 20°C for analysis. After an initial aliquot of approximately 2.3-2.4 mL of standardized hydrochloric acid (~0.1M HCl in ~0.6M NaCl solution), the sample is stirred for 5 minutes while air is bubbled into it at a rate of 200 scc/m to remove any liberated carbon dioxide gas. A Metrohm 876 Dosimat Plus is used for all standardized hydrochloric acid additions. After equilibration, ~19 aliquots of 0.035 ml are added. Between the pH range of 3.5 to 3.0, the progress of the titration is monitored using a pH glass electrode/reference electrode cell, and the total alkalinity is computed from the titrant volume and e.m.f. measure-ments using a non-linear least-squares approach ([Dickson2007]). An Agilent 34970A Data Acquisition/Switch Unit with a 34901A multiplexer is used to read the voltage measurements from the electrode and monitor the temperatures from the sample, acid, and room. The calculations for this procedure are performed automatically using LabVIEW 2012. |
| Standardization description: | The samples were standardized using Certified Reference Materials (CRMs) provided by Dr. A. Dickson of Scripps Institution of Oceanography. |
| Standardization frequency: | Daily |
| CRM manufacturer: | Certified Reference Material (Dr. Andrew Dickson, Marine Physical Laboratory, La Jolla, California) |
| CRM batch number: | 178 2216.53 ± 0.61 𝜇mol/kg; 180 2224.47 ± 0.56 𝜇mol/kg |
| Preservation method: | Mercuric chloride |
| Preservative volume: | 200 μL |
| Uncertainty: | Duplicate Standard Deviation ± 1.55 µmol kg-1 (143) [± std. dev. (n)] |
| Quality flag convention: | WOCE quality control flags are used: 2 = good value, 3 = questionable value, 4 = bad value |
| Method reference: | Dickson 2007 |
| Researcher name: | Andrew Dickson |
| Researcher institution: | SIO |
| pH on total scale | |
|---|---|
| Abbreviation: | PH_TOT |
| Observation type: | discrete, bottle |
| Sampling instrument: | Niskin Bottles |
| Analyzing instrument: | Agilent 8453 spectrophotometer |
| Detailed sampling and analyzing information: | pH was measured spectrophotometrically on the total hydrogen scale using an Agilent 8453 spectrophotometer and in accordance with the methods outlined by Carter et al., 2013. [Carter2013]. A Kloehn V6 syringe pump was used to autonomously fill, mix, and dispense sample through the custom 10cm flow-through jacketed cell. A Thermo Fisher Isotemp recirculating water bath was used to maintain the cell temperature at 25.0°C during analyses, and a YSI 4600 precision thermometer and probe were used to monitor and record the temperature of each sample during the spec-trophotometric measurements. Purified meta-cresol purple (mCP) was the indicator used to measure the absorbance of light measured at two different wavelengths (434 nm, 578 nm) corresponding to the maximum absorbance peaks for the acidic and basic forms of the indicator dye. A baseline absorbance was also measured and subtracted from these wavelengths. The baseline absorbance was determined by averaging the absorbances from 725-735nm. The ratio of the absorbances was then used to calculate pH on the total scale using the equations outlined in Liu et al., 2011 [Liu2011]. The salinity data used was obtained from the salinity analysis conducted on board. |
| Quality flag convention: | WOCE quality control flags are used: 2 = good value, 3 = questionable value, 4 = bad value |
| Researcher name: | Andrew Dickson |
| Researcher institution: | SIO |
| 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: | Jim Swift |
| Researcher institution: | SIO |
| 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: | Jim Swift |
| Researcher institution: | SIO |
| Nutrients | |
|---|---|
| Abbreviation: | SILCAT, NITRAT, NITRIT, PHSPHT |
| Unit: | UMOL/KG |
| Observation type: | Bottle, discrete |
| Sampling instrument: | CTD Niskin Bottles |
| Analyzing instrument: | Discrete samples were run on a continuous flow analyzer. |
| Quality flag convention: | WOCE quality control flags are used: 2 = good value, 3 = questionable value, 4 = bad value |
| Researcher name: | Susan Becker, Jim Swift |
| Researcher institution: | SIO |
| Dissolved Oxygen | |
|---|---|
| Abbreviation: | OXYGEN |
| Unit: | UMOL/KG |
| Observation type: | Bottle, discrete |
| Sampling instrument: | CTD Niskin Bottles |
| Quality flag convention: | WOCE quality control flags are used: 2 = good value, 3 = questionable value, 4 = bad value |
| Researcher name: | Susan Becker, Jim Swift |
| Researcher institution: | SIO |
| Chlorofluorocarbons | |
|---|---|
| Abbreviation: | CFC11, CFC12 |
| Unit: | PMOL/KG |
| Observation type: | Bottle, discrete |
| Sampling instrument: | CTD Niskin Bottles |
| Quality flag convention: | WOCE quality control flags are used: 2 = good value, 3 = questionable value, 4 = bad value |
| Researcher name: | Dong-Ha Min |
| Researcher institution: | UT |
PUBLICATIONS DESCRIBING THIS DATASET:
none;
ADDITIONAL INFORMATION:
none;
FUNDING AGENCY:
National Science Foundation, National Oceanic and Atmospheric Administration
PROJECT TITLE:
PROJECT ID:
SUBMITTED BY: Robert M. Key (key@princeton.edu)
SUBMISSION DATE: 2020-04-06
REVISION DATE: 2021-08-17
PREVIOUS VERSIONS: Version 1.1
