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Total alkalinity, pH on total scale, water temperature, salinity and other variables obtained during the R/V R/V Pourquoi Pas? GEOTRACES GA01 cruise along the GO-SHIP hydrographic section A25 (EXPOCODE 35PK20140515) in the North Atlantic Ocean from 2014-05-15 to 2014-06-30 (NCEI Accession 0173358)

INVESTIGATORS:
Fiz F. Pérez ORCID logo - Institute of Marine Research Vigo (IIM)
Paul J. Tréguer - Laboratoire Des Sciences de L'Environnement Marin (LEMAR)
Maribel I. García-Ibáñez - Institute of Marine Research Vigo (IIM)
Pierre Branellec - IFREMER, University of Brest, CNRS, IRD, LOPS UMR 6523, IUEM
Pascale Lherminier - IFREMER
Géraldine Sarthou - CNRS, Environmental Sciences Laboratory (LEMAR, UMR 6539) at the European Institute for Marine Studies (IUEM)

PACKAGE DESCRIPTION: This dataset includes discrete sample and profile data collected during the R/V Pourquoi Pas? OVIDE-14 cruise along the GO-SHIP Section A25 and GEOTRACES GA01 (EXPOCODE 35PK20140515) in the North Atlantic Ocean from 2014-05-15 to 2014-06-30. These data include total alkalinity, pH on total scale, oxygen, temperature, salinity, nutrients and other measurements. The instruments used to collect these data include alkalinity titrator, CTD, bottle and spectrophotometer. These data were collected by Fiz Pérez of Instituto de Investigaciones Marinas de Vigo as part of the Hydrographic Repeat Sections Project data set. The International Global Ocean Carbon and Repeat Hydrography Program carries out a systematic and global re-occupation of select World Ocean Circulation Experiment (WOCE) hydrographic sections to quantify changes in storage and transport of heat, fresh water, carbon dioxide, and related parameters.

CITE AS: Pérez, Fiz F.; Tréguer, Paul J.; Branellec, Pierre; García-Ibáñez, Maribel I.; Lherminier, Pascale; Sarthou, Géraldine (2018). Total alkalinity, pH on total scale, water temperature, salinity and other variables obtained during the R/V R/V Pourquoi Pas? GEOTRACES GA01 cruise along the GO-SHIP hydrographic section A25 (EXPOCODE 35PK20140515) in the North Atlantic Ocean from 2014-05-15 to 2014-06-30 (NCEI Accession 0173358). [indicate subset used]. NOAA National Centers for Environmental Information. Dataset. https://doi.org/10.7289/v5cv4g2b. Accessed [date].

FAIR DATA USE REQUEST: [Please read before downloading the data] Please note that cruise data are as provided in the National Center for Environmental Information's Ocean Carbon Data System archived version. For the original cruise data please see SEANOE data publication: Perez Fiz, Treguer Paul, Branellec Pierre, García-Ibáñez Maribel I., Lherminier Pascale, Sarthou Géraldine (2018). The 2014 Greenland-Portugal GEOVIDE bottle data (GO-SHIP A25 and GEOTRACES GA01). SEANOE. https://doi.org/10.17882/54653


DATA PACKAGES RELATED TO THIS ONE:
IDENTIFICATION INFORMATION FOR THIS DATA PACKAGE:
NCEI ACCESSION: 0173358
NCEI DOI: https://doi.org/10.7289/v5cv4g2b
EXPOCODE: 35PK20140515;
CRUISE ID: OVIDE_2014, GEOTRACES GA01;
SECTION/LEG: WOCE A01W; WOCE A25;

TYPES OF STUDY:
Discrete measurement;Profile;

TEMPORAL COVERAGE:
START DATE: 2014-05-15
END DATE: 2014-06-30

SPATIAL COVERAGE:
NORTH: 60
WEST: -53.8
EAST: -9.2
SOUTH: 40.2

GEOGRAPHIC NAMES:
North Atlantic Ocean;

PLATFORMS:
R/V Pourquoi pas? (ID: 35PK);

RESEARCH PROJECT(S):
Observatoire de la variabilite interannuelle et decennale (OVIDE);

VARIABLES / PARAMETERS:

Total alkalinity
Abbreviation: TALK
Observation type: discrete
In-situ / Manipulation / Response variable: In-situ observation
Measured or calculated: Measured
Type of titration: potentiometric titration
Curve fitting method: Total alkalinity was measured by potentiometric titrations to final pH of 4.40 following Pérez and Fraga 1987. Seawater samples for alkalinity were collected after pH samples, in 600 ml glass bottles. Samples were filled to overflowing and immediately stopped. Total alkalinity was measured using an automatic potentiometric titrator "TITRANDO Metrohm", with a combination glass electrode and a Pt-1000 probe (Metrohm 6.0257.000). The potentiometric titrations were carried out with hydrochloric acid ([HCl] = 0.1 M, Riedel-deHaën, Fixanal 38285).
Uncertainty: The precision of the AT measurements (± 0.34 μmol·kg-1) was calculated analysing 14 samples for reproducibility taken from different Niskin bottles closed at the same level (4815 dbar) at station 0. Besides, the 1011 AT duplicates analyses showed a reproducibility of 0.23 ± 0.44 μmol·kg-1 along the cruise.
Method reference: Pérez, F.F. and F. Fraga. 1987. A precise and rapid analytical procedure for alkalinity determination. Mar. Chem.,21, 169-182
pH
Abbreviation: PH_TOT
pH scale: SWS@25C
Observation type: discrete
In-situ / Manipulation / Response variable: In-situ observation
Measured or calculated: Measured
Temperature of pH measurement: 25C
Detailed sampling and analyzing information: pH was measured spectrophotometrically following Clayton and Byrne (1993). This method consists on adding a dye solution to the seawater sample, so that the ratio between two absorbencies at two different wavelengths is proportional to the sample pH. Seawater samples for pH were collected at 95 stations after oxygen samples from depth using cylindrical optical glass 10-cm path length cells, which were filled to overflowing and immediately stopped. The indicator was a solution of m-cresol purple prepared in seawater. After sampling all the samples were stabilised at 25ºC. All the absorbance measurements were obtained in the thermostated (25±0.2 ºC) cell compartment of a SHIMADZU UV-2401PC spectrophotometer. Seawater pH was measured using a double-wavelength spectrophotometric procedure (Byrne, 1987). The absorbance was measured at three different fixed wavelengths (434, 578 and 730 nm) and 75 μl of the dye solution were added to each sample using an adjustable repeater pipette. pH, on the total hydrogen ion concentration scale, is calculated using the following formula (Clayton and Byrne, 1993):
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
SALNTY
Abbreviation: SALNTY
Controlled vocabulary name: SALINITY
In-situ / Manipulation / Response variable: in-situ
OXYGEN
Abbreviation: OXYGEN
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
NITRAT
Abbreviation: NITRAT
Unit: UMOL/KG
Controlled vocabulary name: NITRATE
In-situ / Manipulation / Response variable: in-situ
ALKALI
Abbreviation: ALKALI
Unit: UMOL/KG
Controlled vocabulary name: total alkalinity
In-situ / Manipulation / Response variable: in-situ
PH_SWS
Abbreviation: PH_SWS
Unit: @25C
Controlled vocabulary name: pH
In-situ / Manipulation / Response variable: in-situ
PH_TMP
Abbreviation: PH_TMP
Unit: DEG_C
Controlled vocabulary name: pH
In-situ / Manipulation / Response variable: in-situ
THETA
Abbreviation: THETA
Unit: DEG_C
Controlled vocabulary name: Potential temperature (theta)
In-situ / Manipulation / Response variable: in-situ
PUBLICATIONS DESCRIBING THIS DATASET:
Perez, Fiz; Treguer, Paul; Branellec, Pierre; García-Ibáñez, Maribel I.; Lherminier, Pascale; Sarthou, Géraldine (2018). The 2014 Greenland-Portugal GEOVIDE bottle data (GO-SHIP A25 and GEOTRACES GA01). SEANOE. https://doi.org/10.17882/54653
García-Ibáñez Maribel I., Perez Fiz F., Lherminier Pascale, Zunino Rodriguez Patricia, Mercier Herle, Treguer Paul (2018). The 2014 Greenland-Portugal GEOVIDE water masses data (GO-SHIP A25 and GEOTRACES GA01). Seanoe. https://doi.org/10.17882/54739
Lherminier, Pascale; Sarthou, Geraldine (2017). The 2014 Greenland-Portugal GEOVIDE CTDO2 hydrographic and SADCP data (GO-SHIP A25 and GEOTRACES GA01). SEANOE. https://doi.org/10.17882/52153
ADDITIONAL INFORMATION:
none;
FUNDING AGENCY:

SUBMITTED BY: Robert M. Key (key@princeton.edu)

SUBMISSION DATE: 2018-05-21

REVISION DATE: 2024-04-12

PREVIOUS VERSIONS: Version 1.1