Discrete, profile measurements of the dissolved inorganic carbon (DIC), total alkalinity, pH on total scale and other hydrographic and chemical data obtained during the PS-94, ARK-XXIX/3, TransArc-II cruise onboard R/V Polarstern (EXPOCODE 06AQ20150817) in the central Arctic Ocean from 2015-08-17 to 2015-10-15 (NCEI Accession 0170256)
INVESTIGATORS:
Ursula Schauer
- Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung
Elizabeth M. Jones
- Royal Netherlands Institute for Sea Research (NIOZ)
Adam Ulfsbo
- University of Gothenburg, Department of Chemistry and Molecular Biology
Dennis A. Hansell 
- Rosenstiel School of Marine and Atmospheric Science (RSMAS)
- Rosenstiel School of Marine and Atmospheric Science (RSMAS)PACKAGE DESCRIPTION: The expedition PS94 Trans-Arctic survey of the Arctic Ocean in transition ("TransArc II") aimed at capturing the physical, biological, and chemical changes of the Arctic Ocean. The retreat of the multi-year sea ice over the last decades, and the changes in ice and ocean circulation are tightly linked to changes in the heat and fresh water distribution with consequences for the gas exchange between ocean and atmosphere, for biogeochemical cycling and for organisms and ecosystems in the sea ice, in the water column and on the sea floor. This NCEI Accession includes discrete bottle measurements of Dissolved Inorganic Carbon (DIC), Total Alkalinity, pH on total scale, water temperature and salinity, oxygen, nutrients, CFCs, Dissolved organic carbon and other parameters measured onboard the R/V Polarstern in the central Arctic Ocean during the PS-94, ARK-XXIX/3, TransArc-II cruise (EXPOCODE 06AQ20150817) from 2015-08-17 to 2015-10-15.
CITE AS: Schauer, Ursula; Jones, Elizabeth M.; Ulfsbo, Adam; Hansell, Dennis A.; Smethie, William M., Jr.; Rabe, Benjamin; van Ooijen, Jan C. (2018). Discrete, profile measurements of the dissolved inorganic carbon (DIC), total alkalinity, pH on total scale and other hydrographic and chemical data obtained during the PS-94, ARK-XXIX/3, TransArc-II cruise onboard R/V Polarstern (EXPOCODE 06AQ20150817) in the central Arctic Ocean from 2015-08-17 to 2015-10-15 (NCEI Accession 0170256). [indicate subset used]. NOAA National Centers for Environmental Information. Dataset. https://doi.org/10.7289/v5319t5z. Accessed [date].
IDENTIFICATION INFORMATION FOR THIS DATA PACKAGE:
NCEI ACCESSION: 0170256
NCEI DOI: https://doi.org/10.7289/v5319t5z
EXPOCODE: 06AQ20150817;
CRUISE ID: ARK-XXIX/3;
PS-94;
TransArc-II;
SECTION/LEG: Arctic Ocean;
TYPES OF STUDY:
Discrete measurement;Profile;
TEMPORAL COVERAGE:
SPATIAL COVERAGE:
GEOGRAPHIC NAMES:
PLATFORMS:
RESEARCH PROJECT(S):
Discrete measurement;Profile;
TEMPORAL COVERAGE:
START DATE: 2015-08-17
END DATE: 2015-10-15
SPATIAL COVERAGE:
NORTH: 90
WEST: 20
EAST: -116.4
SOUTH: 70.7
GEOGRAPHIC NAMES:
Arctic Ocean;
PLATFORMS:
R/V Polarstern (ID: 06AQ);
RESEARCH PROJECT(S):
ART;
Arctic ROOS;
Arctic/Subarctic Ocean Fluxes (ASOF);
FRAM;
GEOTRACES (GEOTRACES);
RACE;
TransArc II;
Transdrift;
VARIABLES / PARAMETERS:
| Dissolved Inorganic Carbon | |
|---|---|
| Abbreviation: | TCARBN |
| Unit: | UMOL/KG |
| Observation type: | Discrete, bottle |
| Measured or calculated: | Measured |
| Sampling instrument: | Niskin Bottles |
| Analyzing instrument: | VINDTA 3C instrument (MARIANDA, Kiel) |
| Detailed sampling and analyzing information: | DIC and TA were determined on all seawater and ice core melt samples. Both DIC and TA are measured in parallel with a VINDTA 3C instrument (MARIANDA, Kiel). The accuracy is set by internationally recognized and widely used certi ed reference material (CRM), batch 144, obtained from Prof. A. Dickson at Scripps Institute of Oceanography (USA). DIC is the sum of all dissolved inorganic carbon species and is determined by a precise coulometric method (Dickson et al., 2007). For every coulometric cell that was used in the coulometer, at least two CRMs were measured in duplicate at the beginning and the end of the analyses, where differences in the measurements infer the precision of the instrument. The precision for DIC and TA was determined from the in-bottle CRM duplicate analyses to be better than 2 umol/kg. The accuracy was checked against frequent analysis of CRMs. |
| CRM manufacturer: | Andrew Dickson Laboratory at SIO |
| CRM batch number: | Batch 144 |
| Preservation method: | mercuric chloride solution |
| Preservative volume: | 100 mL |
| Uncertainty: | precision was better than 2 micromol kg-1 |
| Quality flag convention: | WOCE quality control flags are used: 2 = good value, 3 = questionable value, 4 = bad value |
| Researcher name: | Elisabeth Jones; Adam Ulfsbo |
| Researcher institution: | Royal Netherlands Institute for Sea Research, the Netherlands; University of Gothenburg, Sweden |
| Total alkalinity | |
|---|---|
| Abbreviation: | ALKALI |
| Unit: | UMOL/KG |
| Observation type: | Discrete, bottle |
| Measured or calculated: | Measured |
| Sampling instrument: | Niskin Bottles |
| Analyzing instrument: | ALKALI were determined on all seawater and ice core melt samples. Both DIC and TA are measured in parallel with a VINDTA 3C instrument (MARIANDA, Kiel) |
| Type of titration: | potentiometric titration |
| Cell type (open or closed): | open |
| CRM batch number: | Batch 144 |
| Uncertainty: | The precision for TA was determined from the in-bottle CRM duplicate analyses to be better than 2 μmol/kg. The accuracy was checked against frequent analysis of CRMs. |
| Quality flag convention: | WOCE quality control flags are used: 2 = good value, 3 = questionable value, 4 = bad value |
| Method reference: | Dickson, Andrew G., Chris Sabine and James R. Christian, editors, "Guide to Best Practices for Ocean CO2 Measurements", Pices Special Publication 3, IOCCP Report No. 8, October 2007, SOP 3b, "Determination of total alkalinity in sea water using an open-cell titration" |
| Researcher name: | Elisabeth Jones; Adam Ulfsbo |
| Researcher institution: | Royal Netherlands Institute for Sea Research, the Netherlands; University of Gothenburg, Sweden |
| pH | |
|---|---|
| Abbreviation: | PH_TOT |
| pH scale: | Total |
| Observation type: | Discrete, bottle |
| Measured or calculated: | Measured |
| Sampling instrument: | Niskin Bottles |
| Analyzing instrument: | spectrophotometry (pH) |
| Temperature of pH measurement: | 25 Deg C |
| Detailed sampling and analyzing information: | A total of 54 stations were sampled for seawater pH using borosilicate bottles (250 mL), having tight plastic screw caps, and were rinsed with at least one bottle volume and lled to the rim. All samples were thermostated to 25degC at least 30 min prior to analysis directly after sampling. Seawater pH was determined spectrophotometrically (Clayton and Byrne, 1993) using the sulfonephthalein indicator m-Cresol Purple (mCP). Puri ed mCP (Liu et al., 2011) was purchased from the laboratory of Robert H. Byrne, University of South Florida, USA. The indicator solution (0.2 mM) was prepared by dissolving pre-weighed mCP indicator in 0.5 L ltered seawater (0.20 um) of about salinity 34. The indicator was adjusted to a pH in the same range as the samples, approximately +/- 0.2 pH units, by adding a small volume of concentrated HCl or NaOH. The pH values are corrected to 25degC on the total scale. The overall precision from duplicate sample analysis was better than +/-0.001 pH units. The accuracy is mainly set by the accuracy of the physico-chemical characterizations of the indicator with respect to temperature dependence and the determination of the equilibrium constants of the indicator, as well as the purity of the indicator (Liu et al., 2011). The accuracy was checked against Certi ed Reference Material for total alkalinity and total dissolved inorganic carbon, indicating that it should be well below 0.01 pH units. |
| At what temperature was pH reported: | at SST |
| Uncertainty: | 0.001 |
| Quality flag convention: | WOCE quality control flags are used: 2 = good value, 3 = questionable value, 4 = bad value |
| Researcher name: | Elisabeth Jones; Adam Ulfsbo |
| Researcher institution: | Royal Netherlands Institute for Sea Research, the Netherlands; University of Gothenburg, Sweden |
| 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: | B. Rabe |
| Researcher institution: | AWI |
| 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: | B. Rabe |
| Researcher institution: | AWI |
| Bottle Salinity | |
|---|---|
| Abbreviation: | SALNTY |
| Observation type: | Bottle, discrete |
| Sampling instrument: | CTD |
| Quality flag convention: | WOCE quality control flags are used: 2 = good value, 3 = questionable value, 4 = bad value |
| Researcher name: | B. Rabe |
| Researcher institution: | AWI |
| CTD Oxygen | |
|---|---|
| Abbreviation: | CTDOXY |
| Unit: | UMOL/KG |
| Observation type: | CTD sensor |
| Sampling instrument: | CTD |
| Quality flag convention: | WOCE quality control flags are used: 2 = good value, 3 = questionable value, 4 = bad value |
| Researcher name: | B. Rabe |
| Researcher institution: | AWI |
| Bottle Oxygen | |
|---|---|
| Abbreviation: | OXYGEN |
| Unit: | UMOL/KG |
| Observation type: | Bottle, discrete |
| Sampling instrument: | CTD |
| Quality flag convention: | WOCE quality control flags are used: 2 = good value, 3 = questionable value, 4 = bad value |
| Researcher name: | B. Rabe |
| Researcher institution: | AWI |
| Nutrients | |
|---|---|
| Abbreviation: | SILCAT, NITRAT, NITRIT, PHSPHT |
| Unit: | UMOL/KG |
| Observation type: | Bottle, discrete |
| Sampling instrument: | CTD |
| Quality flag convention: | WOCE quality control flags are used: 2 = good value, 3 = questionable value, 4 = bad value |
| Researcher name: | B. Rabe |
| Researcher institution: | AWI |
| CFC | |
|---|---|
| Abbreviation: | CFC |
| Unit: | PMOL/KG |
| Observation type: | Bottle, discrete |
| Sampling instrument: | CTD bottles |
| Quality flag convention: | WOCE quality control flags are used: 2 = good value, 3 = questionable value, 4 = bad value |
| Researcher name: | W. Smethie |
| Researcher institution: | Lamont-Doherty Earth Observatory, Columbia University |
| Dissolved Organic carbon | |
|---|---|
| Abbreviation: | DOC |
| Unit: | UMOL/KG |
| Observation type: | Bottle, discrete |
| Sampling instrument: | CTD bottles |
| Quality flag convention: | WOCE quality control flags are used: 2 = good value, 3 = questionable value, 4 = bad value |
| Researcher name: | D. Hansell |
| Researcher institution: | RSMAS, University of Miami |
PUBLICATIONS DESCRIBING THIS DATASET:
none;
ADDITIONAL INFORMATION:
none;
FUNDING AGENCY:
International agencies
PROJECT TITLE:
GEOTRACES
PROJECT ID:
SUBMITTED BY: Robert M. Key (key@princeton.edu)
SUBMISSION DATE: 2018-01-23
