PH, alkalinity, temperature, salinity and other variables collected from discrete sample and profile observations using Alkalinity titrator, CTD and other instruments from THALASSA in the North Atlantic Ocean from 2010-06-08 to 2010-06-30 (NCEI Accession 0112842)
INVESTIGATORS:
Aída F. Ríos
- Institute of Marine Research Vigo (IIM)
Herlé Mercier
-
Fiz F. Pérez 
- Institute of Marine Research Vigo (IIM)
- Institute of Marine Research Vigo (IIM)PACKAGE DESCRIPTION: This dataset includes discrete sample and profile data collected from THALASSA in the North Atlantic Ocean from 2010-06-08 to 2010-06-30 and retrieved during cruise CLIVAR_OVIDE_2010. These data include DISSOLVED OXYGEN, HYDROSTATIC PRESSURE, NITRATE, Potential temperature (theta), SALINITY, TOTAL ALKALINITY (TA), WATER TEMPERATURE, pH, phosphate and silicate. The instruments used to collect these data include Alkalinity titrator, CTD, bottle and spectrophotometer. These data were collected by Aida F. Ríos and Fiz Pérez of Instituto de Investigaciones Marinas de Vigo and H. Mercier [affiliation unknown] as part of the CLIVAR_OVIDE_2010 data set. The International CLIVAR Global Ocean Carbon and Repeat Hydrography Program carries out a systematic and global re-occupation of select WOCE/JGOFS hydrographic sections to quantify changes in storage and transport of heat, fresh water, carbon dioxide (CO2), and related parameters.
CITE AS: Ribas-Ribas, Mariana; Fajar, Noelia M.; Mercier, Herlé; Thierry, Virginie; Branellec, Pierre; Lherminier, Pascale; Morin, Pascal (2013). PH, alkalinity, temperature, salinity and other variables collected from discrete sample and profile observations using Alkalinity titrator, CTD and other instruments from THALASSA in the North Atlantic Ocean from 2010-06-08 to 2010-06-30 (NCEI Accession 0112842). [indicate subset used]. NOAA National Centers for Environmental Information. Dataset. https://doi.org/10.3334/cdiac/otg.clivar_ovide_2010. Accessed [date].
DATA PACKAGES RELATED TO THIS ONE:
none;
none;
IDENTIFICATION INFORMATION FOR THIS DATA PACKAGE:
NCEI ACCESSION: 0112842
NCEI DOI: https://doi.org/10.3334/cdiac/otg.clivar_ovide_2010
EXPOCODE: 35TH20100608;
CRUISE ID: CLIVAR_OVIDE_2010;
SECTION/LEG: OVIDE-10;
WOCE A25;
TYPES OF STUDY:
Discrete measurement;Profile;
TEMPORAL COVERAGE:
SPATIAL COVERAGE:
GEOGRAPHIC NAMES:
PLATFORMS:
RESEARCH PROJECT(S):
Discrete measurement;Profile;
TEMPORAL COVERAGE:
START DATE: 2010-06-08
END DATE: 2010-06-30
SPATIAL COVERAGE:
NORTH: 59.913
WEST: -43.074
EAST: -9.459
SOUTH: 40.331
GEOGRAPHIC NAMES:
Atlantic Ocean;
PLATFORMS:
R/V Thalassa (ID: 35TH);
RESEARCH PROJECT(S):
none;
VARIABLES / PARAMETERS:
| Total alkalinity | |
|---|---|
| Abbreviation: | TA |
| 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 |
| 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:
Clayton, T.D. and R.H. Byrne, Spectrophotometric seawater pH measurements: total hydrogen ion concentration scale concentration scale calibration of m-cresol purple and at-sea results. D.S.R. I, 40, 10, 2115-2129, https://doi.org/10.1016/0967-0637(93)90048-8, 1993.
Mercier, H., P. Lherminier, A. Sarafanov, F. Gaillard, N. Daniault, D. Desbruyères, A. Falina, B. Ferron, C. Gourcuff, T. Huck and V. Thierry, Variability of the meridional overturning circulation at the Greenland-Portugal OVIDE section from 1993 to 2010. Progress in Oceanography, https://doi.org/10.1016/j.pocean.2013.11.001, 2013.
Pérez F.F., A.F. Ríos, T. Rellán and M. Alvarez, Improvements in a fast potentiometric seawater alkalinity determination. Ciencias Marinas, 26(3), 463-478, https://doi.org/10.7773/cm.v26i3.592, 2000.
Zunino, P., M.I. García-Ibáñez, P. Lherminier, H. Mercier, A.F. Ríos and F.F. Pérez, Variability of the transport of anthropogenic CO2 at the Greenland-Portugal OVIDE section: controlling mechanisms. Biogeosci, 11(8), 2375-2389, https://doi.org/10.5194/bg-11-2375-2014, 2014.
García-Ibáñez, Maribel I., Paula C. Pardo, Lidia I. Carracedo, Herle Mercier, Pascale Lherminier, Aida F. Ríos, Fiz F Pérez, 2015: Structure, transports and transformations of the water masses in the Atlantic Subpolar Gyre. Progress in Oceanography, 135, 18-36, https://doi.org/10.1016/j.pocean.2015.03.009.
García-Ibáñez, M. I., Zunino, P., Frob, F., Carracedo, L. I., Ríos, A. F., Mercier, H., Olsen, A., and Pérez, F. F., 2016: Ocean acidification in the North Atlantic: controlling mechanisms, Biogeosciences, 13, 3701-3715. https://doi.org/10.5194/bg-13-3701-2016.
Marcos Fontela, Maribel I. García-Ibáñez, Dennis A. Hansell, Herle Mercier, Fiz F. Pérez, 2016: Dissolved Organic Carbon in the North Atlantic Meridional Overturning Circulation. Sci. Rep. 6, 26931; https://doi.org/10.1038/srep26931.
Zunino, P., P. Lherminier, H. Mercier, X. A. Padín, A. F. Ríos, and F. F. Pérez (2015), Dissolved inorganic carbon budgets in the eastern subpolar North Atlantic in the 2000s from in situ data, Geophys. Res. Lett., 42, 9853-9861, https://doi.org/10.1002/2015GL066243.
ADDITIONAL INFORMATION:
none;
FUNDING AGENCY:
SUBMITTED BY: Alex Kozyr (Alex.Kozyr@noaa.gov)
SUBMISSION DATE: 2013-09-10
REVISION DATE: 2016-02-21
PREVIOUS VERSIONS: Version 1.1Version 2.2
