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Dissolved inorganic carbon (DIC), total alkalinity, temperature, salinity and other variables collected from discrete samples and profile observations during the R/V Celtic Explorer cruise CE17007 along the Global Ocean Ship-Based Hydrographic Investigation Program (GO-SHIP) Section A02 (EXPOCODE 45CE20170427) in the North Atlantic Ocean from 2017-04-27 to 2017-05-22 (NCEI Accession 0208599)

INVESTIGATORS:
Peter L. Croot - Earth and Ocean Sciences, School of Natural Sciences and the Ryan Institute, National University of Ireland Galway
Ute Schuster - University of Exeter
Toste Tanhua ORCID logo - GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany

PACKAGE DESCRIPTION: This dataset includes discrete profile measurements of dissolved inorganic carbon, total alkalinity, temperature, salinity, oxygen, nutrients, chlorofluorocarbon 12 (CFC-12) and sulfur hexafluoride (SF6) made during the R/V Celtic Explorer cruise CE17007 along the Global Ocean Ship-Based Hydrographic Investigation Program (GO-SHIP) Section A02 (EXPOCODE 45CE20170427) in the North Atlantic Ocean from 2017-04-27 to 2017-05-22. Hydrographic measurements along this section were made under the direction of the GO-SHIP. This reoccupation of the A02 section was supported by the Irish Marine Institute and funded under the Marine Research Programme by the Irish Government. Individual teams were supported by the European Union’s Horizon 2020 and the Canada Excellence Research Chair in Ocean Science and Technology.

CITE AS: Croot, Peter L.; Schuster, Ute; Tanhua, Toste; Szumski, Tom; McGovern, Evin (2020). Dissolved inorganic carbon (DIC), total alkalinity, temperature, salinity and other variables collected from discrete samples and profile observations during the R/V Celtic Explorer cruise CE17007 along the Global Ocean Ship-Based Hydrographic Investigation Program (GO-SHIP) Section A02 (EXPOCODE 45CE20170427) in the North Atlantic Ocean from 2017-04-27 to 2017-05-22 (NCEI Accession 0208599). [indicate subset used]. NOAA National Centers for Environmental Information. Dataset. https://doi.org/10.25921/4379-p950. Accessed [date].


DATA PACKAGES RELATED TO THIS ONE:
IDENTIFICATION INFORMATION FOR THIS DATA PACKAGE:
NCEI ACCESSION: 0208599
NCEI DOI: https://doi.org/10.25921/4379-p950
EXPOCODE: 45CE20170427;
CRUISE ID: CE17007;
SECTION/LEG: GO-SHIP A02;

TYPES OF STUDY:
Discrete measurement;Profile;

TEMPORAL COVERAGE:
START DATE: 2017-04-27
END DATE: 2017-05-22

SPATIAL COVERAGE:
NORTH: 49.8
WEST: -50.1
EAST: -10.4
SOUTH: 41.6

GEOGRAPHIC NAMES:
North Atlantic Ocean;

PLATFORMS:
R/V Celtic Explorer (ID: 45CE);

RESEARCH PROJECT(S):
none;

VARIABLES / PARAMETERS:

Dissolved Inorganic Carbon
Abbreviation: TCARBN
Unit: UMOL/KG
Observation type: discrete
In-situ / Manipulation / Response variable: In-situ observation
Measured or calculated: Measured
Detailed sampling and analyzing information: All measurements were completed on two Versatile INstrument for the Determination of Titration Alkalinity (VINDTA, version 3C, SN#064 and #065, Marianda, Germany, Mintrop, 2004) each connected to a coulometer (SN135015020 and SN135015019 respectively). Water samples were first analysed for Dissolved Inorganic Carbon (DIC). An excess of phosphoric acid (1M, 8.5%) was added to a calibrated volume of seawater sample to convert all inorganic dissolved carbon to CO2. This CO2 was then transported to the coulometer cell by oxygen-free-nitrogen gas (OfN), which was filtered through soda lime to remove any residual traces of CO2 prior to coming in contact with the recently converted CO2. In the cell, all CO2 is quantitatively absorbed to form an acid that is subsequently titrated via coulometry. See Dickson et al., (2007) SOP #02 for more detailed information.
Standardization description: Initial DIC calibration was done during the cruise for each instrument by correcting all sample data by the difference between the mean of all CRMs. Post-cruise data quality control will include the calibration of the DIC readings for each coulometer cell used during CE17007, identification and removal of errors/outliers and accounting for instrument drift.
CRM manufacturer: Prof A Dickson, Scripps Institute of Oceanography, San Diego, USA
CRM batch number: CRM batch 163 (certified at 2039.49 ± 0.73 for DIC)
Method reference: Dickson, A. G., Sabine, C. L., and Christian, J. R. (Eds.) (2007), Guide to best practices for ocean CO2 measurements, PICES Special Publication 3, pp.191
Researcher name: Ute Schuster
Researcher institution: University of Exeter
Total alkalinity
Abbreviation: ALKALI
Unit: UMOL/KG
Observation type: discrete
In-situ / Manipulation / Response variable: In-situ observation
Measured or calculated: Measured
Type of titration: Total Alkalinity was measured by potentiometric titration using the same VINDTA machines as for DIC analysis. These systems use a highly precise Metrohm Titrino for acid addition, an ORION-Ross pH electrode, a Metrohm reference electrode and an auxiliary electrode. Similarly to the DIC analysis, the pipette and analysis cell were kept at the same temperature as the samples (25oC) by a water jacket. Hydrochloric acid (0.1M) made to the ionic strength of seawater was used as the alkalinity titrant as described in SOP#3B (Dickson et al., 2007). Alkalinity values were calibrated using replicate analyses taken from the 500mL bottles and CRM batch 163 (certified at 2215.53 kg-1 ± 0.56 for TA). See Dickson et al., (2007) SOP #03 for more detailed information. Post-cruise data corrections will include a recalculation of alkalinities using CTD temperature, salinity and nutrients, and also incorporate a recalibration of the alkalinity pipettes’ volume and temperature sensors. Post-cruise Quality Control will identify and remove outliers and account for drift in the instruments’ alkalinity measurements taken over the course of the cruise.
CRM manufacturer: Prof A Dickson, Scripps Institute of Oceanography, San Diego, USA
CRM batch number: CRM batch 163 (certified at 2215.53 kg-1 ± 0.56 for TA).
Uncertainty: Repeated measurements on the same batch of seawater (n=3) were undertaken every day prior to sample analysis in order to assess the precision of the method. The precision was estimated for the whole dataset to be 3 μmol kg-1 for DIC and 4 μmol kg-1 for TA. The accuracy of the measurement is assured by the standardization using the CRM from A.G. Dickson, Scripps Institution of Oceanography on daily basis.
Method reference: Dickson, A. G., C. L. Sabine, and J. R. Christian. 2007. Guide to best practices for ocean CO2 measurements. PICES Special Publication 3. 191 pp.
CTDTMP
Abbreviation: CTDTMP
Unit: DEG_C
Controlled vocabulary name: WATER TEMPERATURE
In-situ / Manipulation / Response variable: in-situ
CTDSAL
Abbreviation: CTDSAL
Controlled vocabulary name: SALINITY
In-situ / Manipulation / Response variable: in-situ
CTDOXY
Abbreviation: CTDOXY
Unit: UMOL/KG
Controlled vocabulary name: DISSOLVED OXYGEN
In-situ / Manipulation / Response variable: in-situ
SILCAT
Abbreviation: SILCAT
Unit: UMOL/KG
Controlled vocabulary name: silicate
In-situ / Manipulation / Response variable: in-situ
Nitrate
Abbreviation: NITRAT
Unit: UMOL/KG
In-situ / Manipulation / Response variable: in-situ
Nitrite
Abbreviation: NITRIT
Unit: UMOL/KG
In-situ / Manipulation / Response variable: in-situ
PHSPHT
Abbreviation: PHSPHT
Unit: UMOL/KG
Controlled vocabulary name: phosphate
In-situ / Manipulation / Response variable: in-situ
Chlorofluorocarbon 12
Abbreviation: CFC-12
Unit: PMOL/KG
In-situ / Manipulation / Response variable: in-situ
Sulfur Hexaflouride
Abbreviation: SF6
Unit: PMOL/KG
In-situ / Manipulation / Response variable: in-situ
PUBLICATIONS DESCRIBING THIS DATASET:
none;
ADDITIONAL INFORMATION:
none;
FUNDING AGENCY:
Marine Research Programme by the Irish Government
PROJECT TITLE: Global Ocean Ship-Based Hydrographic Investigation Program (GO-SHIP).
PROJECT ID:

SUBMITTED BY: Nico Lange (nlange@geomar.de)

SUBMISSION DATE: 2020-01-08