INVESTIGATORS:
Richard A. Feely 
- NOAA Pacific Marine Environmental Laboratory (PMEL)
Laurie W. Juranek
- Oregon State CEOAS (OSU-CEOAS)
Simone R. Alin
- NOAA Pacific Marine Environmental Laboratory (PMEL)
PACKAGE DESCRIPTION: This accession has been superseded by NCEI Accession 0123467. Please use and refer to NCEI Accession 0123467 instead of this accession. Users should only use this accession for special cases, such as reproducing previous studies that used this accession. Refer to the documentation for more information.
CITE AS: Feely, Richard A.; Alin, Simone R.; Hales, Burke; Johnson, Gregory C.; Juranek, Laurie W.; Byrne, Robert H.; Peterson, William T.; Goni, Miguel; Liu, Xuewu; Greeley, Dana (2016). Dissolved inorganic carbon, pH, alkalinity, temperature, salinity and other variables collected from discrete sample and profile observations using Alkalinity titrator, CTD and other instruments from WECOMA in the Gulf of the Farallones National Marine Sanctuary, Monterey Bay National Marine Sanctuary and others from 2011-08-12 to 2011-08-30 (NCEI Accession 0157458). [indicate subset used]. NOAA National Centers for Environmental Information. Dataset. https://www.ncei.noaa.gov/archive/accession/0157458. Accessed [date].
DATA PACKAGES RELATED TO THIS ONE:
IDENTIFICATION INFORMATION FOR THIS DATA PACKAGE:
NCEI ACCESSION: 0157458
EXPOCODE: 32WC20110812;
CRUISE ID: WCOA2011;
SECTION/LEG: West Coast OA Cruise;
TYPES OF STUDY: Discrete measurement;Profile;TEMPORAL COVERAGE:
START DATE: 2011-08-12
END DATE: 2011-08-30
SPATIAL COVERAGE:
WEST: -127.55
EAST: -117.75
GEOGRAPHIC NAMES: Pacific Ocean;
PLATFORMS: R/V Wecoma (ID: 32WC);
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 |
| Replicate information: |
Duplicate samples were collected from approximately 10% of the Niskins sampled, as a check of our precision. These replicate samples were interspersed throughout the station analysis for quality assurance and integrity of the coulometer cell solutions. The average absolute difference from the mean of these replicates is 1.04 µmol/kg. No systematic differences between the replicates were observed. |
| Standardization description: |
Each coulometer was calibrated by injecting aliquots of pure CO2 (99.999%) by means of an 8-port valve (Wilke et al., 1993) outfitted with two calibrated sample loops of different sizes (~1ml and ~2ml). The instruments were each separately calibrated at the beginning of each cell with a minimum of two sets of these gas loop injections and then again at the end of each cell to ensure no drift during the life of the cell. |
| CRM batch number: |
109 |
| Total alkalinity |
|---|
| Abbreviation: |
TA |
| Observation type: |
discrete |
| In-situ / Manipulation / Response variable: |
In-situ observation |
| Measured or calculated: |
Measured |
| Type of titration: |
Potentiometric titration |
| Cell type (open or closed): |
open cell |
| Curve fitting method: |
Non-linear least squares Two-stage, potentiometric, open-cell titration using coulometrically analyzed hydrochloric acid |
| Uncertainty: |
Analytical accuracy was assessed by periodic analysis of Certified Reference Materials (CRMs) throughout the cruise. CRMs were analyzed approximately every 24 samples. For this CRM batch, the average offset for system 1 was 1.16 with a standard deviation of 1.24. The average offset for system 2 was 0.21 with a standard deviation of 1.67. |
| Method reference: |
"Bates, R.G. Determination of pH. Theory and Practice. A Wiley-Interscience Publication, Second Edition. Dickson A.G. (1981). An exact definition of total alkalinity, and a procedure for the estimation of alkalinity and total inorganic carbon from titration data. Deep-Sea Res. 28, 609-623. Dickson A.G. (1992). The development of the alkalinity concept in marine chemistry. Marine chemistry 40:1-21-2, 49-63. Dickson, A. G., Afghan, J. D. & Anderson, G. C. (2003). Reference materials for oceanic CO2 analysis: A method for the certification of total alkalinity. Marine Chemistry 80, 185-197 Gran G. (1952). Determination of the equivalence point in potentiometric titrations. Part II. The analyst, 77, 661-671. Wolf-Gladrow, D.A. et al. (2007). Total alkalinity: The explicit conservative expression and its application to biogeochemical process. " |
| pH |
|---|
| Abbreviation: |
pH |
| pH scale: |
Total Scale |
| Observation type: |
discrete |
| In-situ / Manipulation / Response variable: |
In-situ observation |
| Measured or calculated: |
Measured |
| Temperature of pH measurement: |
25 °C |
| Detailed sampling and analyzing information: |
Samples were collected for pH analysis immediately following O2 in the Niskin/Rosette sampling sequence. Seawater samples were collected from the Niskin bottles directly in 10-cm cylindrical optical cells (~30 mL volume) using a section of silicone tubing (about 15 cm long). One end of the silicone tubing was attached to the optical cell and the other end was attached to the nipple of the Niskin bottle. The Niskin bottle nipple was pushed in to initiate flow and the silicone tubing was squeezed to eliminate air bubbles. The optical cell was agitated to eliminate bubbles and, after 15 seconds of sample flow, the cell was capped at one end. The silicone tubing was then detached from the optical cell and, with the water still flowing, the cap was rinsed and used to seal the optical cell. Samples collected this way were not exposed to the atmosphere, and each cell was flushed with approximately three cell volumes of seawater. The samples were collected, taken into the lab, and rinsed with tap water to get rid of salt outside of the cells. The cells were dried and the optical windows were cleaned with Kimwipes. Samples were thermostatted at 25 (±0.05) ºC in a custom made 36-position cell warmer. A custom macro program running on Agilent ChemStation was used to guide the measurements and data processing. The macro automated the procedures of sample input, blank and sample scans, quality control, and data archiving. The quality control steps included checking the baseline shift after dye injection and monitoring the standard deviation of multiple scans. Absorbance blanks were taken for each sample and 10 microliters of purified m-cresol purple (10 mmol/kg) were added for the analysis. pHT (total scale) was calculated according to Liu et al. (2011). |
| Uncertainty: |
Precision was equal to ±0.0004. |
| CDTTMP |
|---|
| Abbreviation: |
CDTTMP |
| 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 |
| CTDOXY |
|---|
| Abbreviation: |
CTDOXY |
| Unit: |
UMOL/KG |
| Controlled vocabulary name: |
DISSOLVED OXYGEN |
| 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 |
| NITRIT |
|---|
| Abbreviation: |
NITRIT |
| Unit: |
UMOL/KG |
| Controlled vocabulary name: |
NITRITE |
| In-situ / Manipulation / Response variable: |
in-situ |
| PHSPHT |
|---|
| Abbreviation: |
PHSPHT |
| Unit: |
UMOL/KG |
| Controlled vocabulary name: |
phosphate |
| In-situ / Manipulation / Response variable: |
in-situ |
| AMMONI |
|---|
| Abbreviation: |
AMMONI |
| Unit: |
UMOL/KG |
| Controlled vocabulary name: |
AMMONIUM (NH4) |
| 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 |
| PH_TOT |
|---|
| Abbreviation: |
PH_TOT |
| 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 |
| CHLORA |
|---|
| Abbreviation: |
CHLORA |
| Unit: |
UG/L |
| Controlled vocabulary name: |
CHLOROPHYLL A |
| In-situ / Manipulation / Response variable: |
in-situ |
| PON |
|---|
| Abbreviation: |
PON |
| Unit: |
UMOL/L |
| Controlled vocabulary name: |
PARTICULATE ORGANIC NITROGEN (PON) |
| In-situ / Manipulation / Response variable: |
in-situ |
| POC |
|---|
| Abbreviation: |
POC |
| Unit: |
UMOL/L |
| Controlled vocabulary name: |
PARTICULATE ORGANIC CARBON |
| In-situ / Manipulation / Response variable: |
in-situ |
| POC/PON |
|---|
| Abbreviation: |
POC/PON |
| Unit: |
MOL/MOL |
| Controlled vocabulary name: |
PARTICULATE ORGANIC CARBON |
| In-situ / Manipulation / Response variable: |
in-situ |
PUBLICATIONS DESCRIBING THIS DATASET: none;
ADDITIONAL INFORMATION: none;
FUNDING AGENCY: NOAA's Ocean Acidification Program
PROJECT TITLE:
PROJECT ID:
SUBMITTED BY: Alex Kozyr (Alex.Kozyr@noaa.gov)
SUBMISSION DATE: 2016-12-11
