INVESTIGATORS:
Richard A. Feely 
- NOAA Pacific Marine Environmental Laboratory (PMEL)
Rik Wanninkhof
- NOAA Atlantic Oceanographic and Meteorological Laboratory (AOML)
Dennis A. Hansell
- Rosenstiel School of Marine and Atmospheric Science (RSMAS)
Andrew G. Dickson
- Scripps Institution of Oceanography (SIO)
PACKAGE DESCRIPTION: This dataset includes discrete profile measurements of dissolved inorganic carbon (DIC), total alkalinity, pH on total scale, temperature, salinity, dissolved oxygen, nutrients, chlorofluorocarbons (CFC-11, CFC-12), tritium, triter, dissolved organic carbon (DOC), total dissolved nitrogen (TDN) and sulfur hexafluoride (SF6) obtained during the R/V Roger Revelle cruise CLIVAR_I05_2009 (EXPOCODE 33RR20090320) in the Indian Ocean from 2009-03-20 to 2009-05-15. These data were collected by Dennis Hansell of Rosenstiel School of Marine and Atmospheric Science, Rik Wanninkhof of NOAA Atlantic Oceanographic and Meteorological Laboratory, Richard A. Feely of US DOC; NOAA; OAR; Pacific Marine Environmental Laboratory and Andrew Dickson of University of California - San Diego; Scripps Institution of Oceanography as part of the CLIVAR_I05_2009 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: Feely, Richard A.; Dickson, Andrew G.; Hansell, Dennis A.; Wanninkhof, Rik; McNichol, Ann; Key, Robert M. (2013). Dissolved inorganic carbon (DIC), total alkalinity, pH on total scale, temperature, salinity and other variables collected from discrete sample and profile observations during the R/V Roger Revelle cruise CLIVAR_I05_2009 (EXPOCODE 33RR20090320) in the Indian Ocean from 2009-03-20 to 2009-05-15 (NCEI Accession 0108075). [indicate subset used]. NOAA National Centers for Environmental Information. Dataset. https://doi.org/10.3334/cdiac/otg.clivar_i05_2009. Accessed [date].
DATA PACKAGES RELATED TO THIS ONE:
IDENTIFICATION INFORMATION FOR THIS DATA PACKAGE:
NCEI ACCESSION: 0108075
NCEI DOI: https://doi.org/10.3334/cdiac/otg.clivar_i05_2009
EXPOCODE: 33RR20090320;
CRUISE ID: CLIVAR_I05_2009;
SECTION/LEG: CLIVAR I05;
TYPES OF STUDY: Discrete measurement;Profile;TEMPORAL COVERAGE:
START DATE: 2009-03-20
END DATE: 2009-05-15
SPATIAL COVERAGE:
WEST: 30.3437
EAST: 114.8451
GEOGRAPHIC NAMES: Indian Ocean;
PLATFORMS: R/V Roger Revelle (ID: 33RR);
RESEARCH PROJECT(S):
none;
VARIABLES / PARAMETERS:
| Dissolved Inorganic Carbon |
|---|
| Abbreviation: |
TCARBN |
| Unit: |
UMOL/KG |
| Observation type: |
discrete |
| In-situ / Manipulation / Response variable: |
In-situ observation |
| Measured or calculated: |
measured |
| Replicate information: |
The precision is displayed by the greater than 450 replicate samples drawn. The absolute average difference from the mean of these replicates are less than 0.85 μmol/kg. No significant systematic differences were noted. |
| CRM batch number: |
Batch 94 |
| Total alkalinity |
|---|
| Abbreviation: |
ALKALI |
| Unit: |
UMOL/KG |
| 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: |
Non-linear least squares. The total alkalinity analyses performed during I6S, were performed using a two-stage, potentiometric, opencell titration and coulometrically analyzed hydrochloric acid. |
| Uncertainty: |
Precision ~ 1.5 μmol/kg, Accuracy ~ 2.0 μmol/kg |
| 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. |
| pH |
|---|
| Abbreviation: |
PH_TOT |
| pH scale: |
Total scale |
| Observation type: |
discrete |
| In-situ / Manipulation / Response variable: |
In-situ observation |
| Measured or calculated: |
Measured |
| Temperature of pH measurement: |
20 |
| Detailed sampling and analyzing information: |
pH values are determined at a reference temperature of 20 C using the constants of Liu et al. (2011). These values are further adjusted to counter errors created by using constants determined for purified m-cresol dye for measurements made with unpurified (Acros Organics) dye. The applied adjustment is a pH dependent offset estimated by fitting a 2nd order polynomial to the data in figure 2a in the article by Liu et al. (2011). The likely uncertainties on these measurements are explored in detail in Carter et al. (conditionally accepted, 2012). |
| Uncertainty: |
Accuracy of spectrophotometric pH measurements is difficult to constrain with no agreed upon calibration procedure. For this cruise two approaches were made. First, since the same bottles that were sampled for alkalinity and total carbon were sampled for pH, an independent estimate of pH can be obtained from equilibrium equations. Second, pH analyses of Certified Reference Materials (currently only certified for DIC and alkalinity) were performed. A review of the accuracy of the pH measurements is underway, and large changes (~0.01) in the final reported values are likely. Confidence in the precision of the measurements remains high, and likely changes would be a simple offset or an offset that is a simple function of reported pH. |
| 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 |
| 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 |
| CFC-11 |
|---|
| Abbreviation: |
CFC-11 |
| Unit: |
PMOL/KG |
| Controlled vocabulary name: |
CHLOROFLUOROCARBON-11 (CFC-11) |
| In-situ / Manipulation / Response variable: |
in-situ |
| CFC-12 |
|---|
| Abbreviation: |
CFC-12 |
| Unit: |
PMOL/KG |
| Controlled vocabulary name: |
CHLOROFLUOROCARBON-12 (CFC-12) |
| In-situ / Manipulation / Response variable: |
in-situ |
| SF6 |
|---|
| Abbreviation: |
SF6 |
| Unit: |
FMOL/KG |
| Controlled vocabulary name: |
Sulfur Hexaflouride (SF6) |
| 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 |
| DOC |
|---|
| Abbreviation: |
DOC |
| Unit: |
UMOL/KG |
| Controlled vocabulary name: |
DISSOLVED ORGANIC CARBON |
| In-situ / Manipulation / Response variable: |
in-situ |
| TDN |
|---|
| Abbreviation: |
TDN |
| Unit: |
UMOL/KG |
| Controlled vocabulary name: |
Total Dissolved Nitrogen (TDN) |
| In-situ / Manipulation / Response variable: |
in-situ |
| TRITUM |
|---|
| Abbreviation: |
TRITUM |
| Unit: |
TU |
| Controlled vocabulary name: |
Tritium (Hydrogen isotope) |
| In-situ / Manipulation / Response variable: |
in-situ |
| TRITER |
|---|
| Abbreviation: |
TRITER |
| Unit: |
TU |
| In-situ / Manipulation / Response variable: |
in-situ |
PUBLICATIONS DESCRIBING THIS DATASET: none;
ADDITIONAL INFORMATION: none;
FUNDING AGENCY:
SUBMITTED BY: Alex Kozyr (Alex.Kozyr@noaa.gov)
SUBMISSION DATE: 2013-06-05
REVISION DATE: 2016-02-23
PREVIOUS VERSIONS: Version 1.1
