INVESTIGATORS:
Triona McGrath
- National University of Ireland - Galway
Rachel R. Cave
- National University of Ireland - Galway
Evin McGovern
- Marine Institute of Ireland (MI)
Triona McGrath
- Marine Institute and National University of Ireland, Galway
Evin McGovern
- Marine Institute of Ireland (MI)
Rachel R. Cave
- National University of Ireland - Galway
Caroline Kivimäe
- National University of Ireland - Galway
PACKAGE DESCRIPTION: This dataset includes chemical, discrete sample, physical and profile data collected from Celtic Explorer in the North Atlantic Ocean from 2009-02-06 to 2012/01/10. These data include DISSOLVED INORGANIC CARBON (DIC), DISSOLVED OXYGEN, HYDROSTATIC PRESSURE, NITRATE, NITRATE + NITRITE CONTENT (CONCENTRATION), NITRITE, PHOSPHATE, SALINITY, SILICATE, TOTAL ALKALINITY (TA) and WATER TEMPERATURE. The instruments used to collect these data include Alkalinity titrator, CTD, Coulometer for DIC measurement and bottle.
These data were collected by Triona McGrath, Caroline Kivimae, Rachel R. Cave, Evin McGovern, Triona Dr. McGrath, Evin Dr. McGovern and Rachel R. Dr. Cave of National University of Ireland - Galway as part of the COASTAL_Rockall_Trough_2009_2010 and COASTAL_Rockall_Trough_2011_2012 data set. CDIAC assigned the following cruise ID(s) to this data set: CE11001, CE12001 and COASTAL_Rockall_Trough.
The Global Coastal Carbon Data Project data includes the bottle (discrete) and surface (underway) carbon-related measurements from coastal research cruises, the data from time series cruises and coastal moorings. The coastal regions data are very important for the understanding of carbon cycle on the continental margins.
The World Ocean Circulation Experiment (WOCE) was a major component of the World Climate Research Program with the overall goal of better understanding the ocean's role in climate and climatic changes resulting from both natural and anthropogenic causes. The CO2 survey took advantage of the sampling opportunities provided by the WOCE Hydrographic Program (WHP) cruises during this period between 1990 and 1998. The final collection covers approximately 23,000 stations from 94 WOCE cruises.
CITE AS: McGrath, Triona; Kivimäe, Caroline; Cave, Rachel R.; McGovern, Evin (2013). Dissolved inorganic carbon, alkalinity, temperature, salinity and other variables collected from discrete sample and profile observations using Alkalinity titrator, CTD and other instruments from the Celtic Explorer in the North Atlantic Ocean from 2009-02-06 to 2012/01/10 (NCEI Accession 0112886). [indicate subset used]. NOAA National Centers for Environmental Information. Dataset. https://doi.org/10.3334/cdiac/otg.rockall_trough_2012. Accessed [date].
DATA PACKAGES RELATED TO THIS ONE:
none;
IDENTIFICATION INFORMATION FOR THIS DATA PACKAGE:
NCEI ACCESSION: 0112886
NCEI DOI: https://doi.org/10.3334/cdiac/otg.rockall_trough_2012
EXPOCODE: 45CE20090206;
45CE20100209;
45CE20110103;
45CE20120105;
CE0903;
CE10002;
CRUISE ID: CE11001;
CE12001;
COASTAL_Rockall_Trough;
SECTION/LEG: Rockall_Trough;
TYPES OF STUDY: Discrete measurement;Profile;TEMPORAL COVERAGE:
START DATE: 2009-02-06
END DATE: 2012-01-10
SPATIAL COVERAGE:
WEST: -18.2505
EAST: -9.499
GEOGRAPHIC NAMES:
Atlantic Ocean;Eastern North Atlantic;Rockall Trough;
PLATFORMS: R/V Celtic Explorer (ID: 45CE);
RESEARCH PROJECT(S):
none;
VARIABLES / PARAMETERS:
Dissolved Inorganic Carbon |
Abbreviation: |
DIC |
Observation type: |
discrete |
In-situ / Manipulation / Response variable: |
In-situ observation |
Measured or calculated: |
Calculated |
Detailed sampling and analyzing information: |
TCO2 is measured by acidification of the sample with phosphoric acid followed by coulometric titration on a VINDTA-3C (Versatile Instrument for the Determination of Titration Alkalinity) system with UIC coulometer. |
Standardization description: |
A known volume of sample is acidified with phosphoric acid in order to transfer all dissolved inorganic carbon to CO2. The resulting CO2 is forced out of the sample by a continuous flow of pure nitrogen through the sample and the extracted CO2 is passed into a titration cell in the coulometer. The CO2 is titrated coulometrically with a dimethyl sulfoxide (DMSO) based absorbent containing ethanolamine. The CO2 reacts quantitatively with the ethanolamine to produce hydroxyethylcarbanic acid. The pH of the titration is monitored by measuring the transmittance of the thymolphthalein indicator which shows when the titration is finished. The thymol blue indicator fades to the original colour due to generation of hydroxide ions at the cathode to maintain the transmittance of the solution at a constant value. The change in colour is monitored by the photodetector as a percentage of transmittance (%T). The amount of CO2 extracted from the sample is determined by the time integrated current of the hydroxide ions generated. Once the endpoint is reached, the current stops and the VINDTA LabVIEWTM software calculates the TCO2 concentrations. |
CRM batch number: |
97, 99, 102 |
Total alkalinity |
Abbreviation: |
TA |
Observation type: |
discrete |
In-situ / Manipulation / Response variable: |
In-situ observation |
Measured or calculated: |
Measured |
Type of titration: |
potentiometric |
Cell type (open or closed): |
open |
Curve fitting method: |
based on Gran function |
TA blank correction: |
30 |
Uncertainty: |
CE0903: Accuracy is estimated as 1.0u mol/kg, which is the mean of the absolute difference between the 64 duplicate samples analyzed. Precision is estimated as 1.3u mol/kg, which is the standard deviation of the absolute difference between the 64 duplicate samples analyzed. CE10002:Accuracy of the analysis was estimated as 1.3 μmol/kg by calculating the mean of the absolute difference between duplicate samples. Precision of the analysis was estimated as 1.4u mol/kg by calculating the standard deviation of the absolute difference between duplicate samples. |
Method reference: |
Dickson, A.G., Sabine, C.L., Christian, J.R., 2007. Guide to best practices for ocean CO2 measurements. PICES Special Publication 3, 1-191.
Mintrop, L., Pérez, F.F., González-Dávila, M., Körtzinger, A., Ríos, A.F., Santana-Casiano., J.M., 1999. Regional Studies: the carbon dioxide system in the Canary Islands region. Proceedings of the 2nd International Symposium CO2 in the Oceans, Tsukuba, Enero 1999. CGE-1037-99, Center for Global Environmental Research/National Institute for Environmental Studies, Japan pp. 521-524. |
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 |
SALNTY |
Abbreviation: |
SALNTY |
Controlled vocabulary name: |
SALINITY |
In-situ / Manipulation / Response variable: |
in-situ |
NO2+NO3 |
Abbreviation: |
NO2+NO3 |
Unit: |
UMOL/KG |
Controlled vocabulary name: |
nitrate + nitrite content (concentration) |
In-situ / Manipulation / Response variable: |
in-situ |
NITRIT |
Abbreviation: |
NITRIT |
Unit: |
UMOL/KG |
Controlled vocabulary name: |
NITRITE |
In-situ / Manipulation / Response variable: |
in-situ |
SILCAT |
Abbreviation: |
SILCAT |
Unit: |
UMOL/KG |
Controlled vocabulary name: |
silicate |
In-situ / Manipulation / Response variable: |
in-situ |
PHSPHT |
Abbreviation: |
PHSPHT |
Unit: |
UMOL/KG |
Controlled vocabulary name: |
phosphate |
In-situ / Manipulation / Response variable: |
in-situ |
TCARBN |
Abbreviation: |
TCARBN |
Unit: |
UMOL/KG |
Controlled vocabulary name: |
DISSOLVED INORGANIC CARBON (DIC) |
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 |
TALK |
Abbreviation: |
TALK |
Unit: |
UMOL/KG |
Controlled vocabulary name: |
total alkalinity |
In-situ / Manipulation / Response variable: |
in-situ |
NITRAT |
Abbreviation: |
NITRAT |
Unit: |
UMOL/KG |
Controlled vocabulary name: |
NITRATE |
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 |
CTD_TMP |
Abbreviation: |
CTD_TMP |
Unit: |
DEG_C |
Controlled vocabulary name: |
WATER TEMPERATURE |
In-situ / Manipulation / Response variable: |
in-situ |
CTD_OXY |
Abbreviation: |
CTD_OXY |
Unit: |
UMOL/KG |
Controlled vocabulary name: |
DISSOLVED OXYGEN |
In-situ / Manipulation / Response variable: |
in-situ |
PUBLICATIONS DESCRIBING THIS DATASET: McGrath, T., C. Kivimae, E. McGovern, R.R. Cave and E. Joyce. 2013. Winter measurements of oceanic biogeochemical parameters in the Rockall Trough (2009-2012). ESSD 5:375-383, https://doi.org/10.5194/essd-5-375-2013
McGrath, T., Kivimae, C., Tanhua, T., Cave, R.R. and McGovern, E., 2012a. Inorganic carbon and pH levels in the Rockall Trough 1991-2010. Deep Sea Research Part I: Oceanographic Research Papers, 68(0): 79-91.
McGrath, T., Nolan, G. and McGovern, E., 2012b. Chemical characteristics of water masses in the Rockall Trough. Deep Sea Research Part I: Oceanographic Research Papers, 61(0): 57-73.
McGrath, T., C. Kivimae, E. McGovern, R.R. Cave and E. Joyce. 2013. Winter measurements of oceanic biogeochemical parameters in the Rockall Trough (2009-2012). ESSD 5:375-383, https://doi.org/10.5194/essd-5-375-2013
ADDITIONAL INFORMATION: none;
FUNDING AGENCY: National Development Plan 2007-2013
PROJECT TITLE:
PROJECT ID:
SUBMITTED BY: Alex Kozyr (Alex.Kozyr@noaa.gov)
SUBMISSION DATE: 2013-09-12
REVISION DATE: 2014-04-22
PREVIOUS VERSIONS: Version 1.1