INVESTIGATORS:
Hiroshi Uchida
- Japan Agency for Marine-Earth Science and Technology (JAMSTEC)
Akihiko Murata 
- Meteorological Research Institute
PACKAGE DESCRIPTION: This dataset consists of discrete profile measurements of dissolved inorganic carbon (DIC), total alkalinity, pH on total scale, CTD temperature, salinity, dissolved oxygen, nutrients, chlorofluorocarbons (CFC-11, CFC-12, CFC113), sulfur hexafluoride (SF6), fluoro and chlorophyll obtained during the R/V Mirai cruise GOSHIP_S04I_2013 (EXPOCODE 49NZ20130106) in the Indian Ocean and Southern Oceans from 2013-01-06 to 2013-02-15. These data were collected by Hiroshi Uchida and Akihiko Murata of Japan Agency for Marine-Earth Science and Technology (JAMSTEC) as part of the GOSHIP_S04I_2013 data set. CDIAC associated the following cruise ID(s) with this data set: GOSHIP_S04I_2013
CITE AS: Uchida, Hiroshi; Murata, Akihiko; Aoyama, Michio; Kumamoto, Yuichiro; Aoki, Shigeru (2016). Dissolved inorganic carbon (DIC), pH on total scale, total alkalinity, temperature, salinity and other variables collected from discrete sample and profile observations obtained during the R/V Mirai cruise GOSHIP_S04I_2013 (EXPOCODE 49NZ20130106) in the Indian Ocean and Southern Oceans from 2013-01-06 to 2013-02-15 (NCEI Accession 0156925). [indicate subset used]. NOAA National Centers for Environmental Information. Dataset. https://doi.org/10.3334/cdiac/otg.goship_s04i_2013. Accessed [date].
DATA PACKAGES RELATED TO THIS ONE:
IDENTIFICATION INFORMATION FOR THIS DATA PACKAGE:
NCEI ACCESSION: 0156925
NCEI DOI: https://doi.org/10.3334/cdiac/otg.goship_s04i_2013
EXPOCODE: 49NZ20130106;
CRUISE ID: GOSHIP_S04I_2013;
SECTION/LEG: S04I;
TYPES OF STUDY: Discrete measurement;Profile;TEMPORAL COVERAGE:
START DATE: 2013-01-06
END DATE: 2013-02-15
SPATIAL COVERAGE:
WEST: 33.4882
EAST: 107.4453
GEOGRAPHIC NAMES: Southern Ocean;
PLATFORMS: R/V Mirai (ID: 49NZ);
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: |
Calculated |
| Detailed sampling and analyzing information: |
Coulometric |
| Standardization description: |
Measurement of CT was made with two total CO2 measuring systems (called as Systems C and D, respectively; Nippon ANS, Inc.), which were slightly different from each other. The systems comprised of a seawater dispensing system, a CO2 extraction system and a coulometer. In this cruise, we used a same type (Model 3000, Nippon ANS) of coulometers, for Systems C and D, respectively. |
| CRM batch number: |
CRMs, batch 121, certified value = 2039.26 μmol kg-1 |
| 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: |
Gran |
| Cell type (open or closed): |
Close |
| Curve fitting method: |
Measurement of AT was made based on spectrophotometry using a custom-made system (Nippon ANS, Inc.). The system comprises of a water dispensing unit, an auto-burette (765 Dosimat, Metrohm), and a spectrophotometer (Carry 50 Bio, Varian), which are automatically controlled by a PC. |
| Uncertainty: |
The repeatability of measurements was estimated to be 0.6 μmol kg-1, which was calculated from 211 differences of replicate measurements. |
| Method reference: |
Dickson, A. G., C. L. Sabine and J. R. Christian eds. (2007), Guide to best practices for ocean CO2 measurements, PICES Special Publication 3, 191 pp. |
| 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: |
25 °C |
| Detailed sampling and analyzing information: |
For an indicator solution, m-cresol purple (2 mM) was used. The indicator solution was produced on board a ship, and retained in a 1000 ml DURAN® laboratory bottle. We renewed an indicator solution 3 times when the headspace of the bottle became large, and monitored pH or absorbance ratio of the indicator solution by another spectrophotometer (Carry 50 Scan, Varian) using a cell with a short path length of 0.5 mm. In most indicator solutions, the absorbance ratios of the indicator solution were kept mostly between 1.4 and 1.6 by adding acid or alkali solution appropriately. |
| Uncertainty: |
It is recommended that correction for pH change resulting from addition of indicator solutions is made (Dickson et al., 2007). To check the perturbation of pH due to the addition, we measured absorbance ratios by doubling the volume of indicator solutions added to a same seawater sample. We corrected absorbance ratios based on an empirical method (Dickson et al., 2007), although the perturbations were small. Figure 3.7.1 illustrates a perturbation of absorbance ratios by adding indicator solutions for leg 2 in MR12-05 cruise. For 93 leg 3, the tendency was not significant statistically. Thus for correction, a value of 6.3364×10-5 was subtracted from the measured values. The reported values, which are the total scale, were set to the values at 25°C by the CO2 system calculation using data for pH and CT with K1 and K2 from Mehrbach et al. (1973) refit by Dickson and Millero (1987). The repeatability of measurements was estimated to be 0.0005 pH unit, which was calculated from 318 differences of replicate measurements. |
| 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 |
| CFC113 |
|---|
| Abbreviation: |
CFC113 |
| Unit: |
PMOL/KG |
| Controlled vocabulary name: |
CHLOROFLUOROCARBON-113 (CFC-113) |
| 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 |
| CHLORA |
|---|
| Abbreviation: |
CHLORA |
| Unit: |
UG/L |
| Controlled vocabulary name: |
CHLOROPHYLL A |
| In-situ / Manipulation / Response variable: |
in-situ |
| XMISS |
|---|
| Abbreviation: |
XMISS |
| Unit: |
%TRANS |
| In-situ / Manipulation / Response variable: |
in-situ |
| FLUORO |
|---|
| Abbreviation: |
FLUORO |
| Unit: |
VOLTS |
| Controlled vocabulary name: |
FLUORESCENCE |
| In-situ / Manipulation / Response variable: |
in-situ |
PUBLICATIONS DESCRIBING THIS DATASET: none;
ADDITIONAL INFORMATION: none;
FUNDING AGENCY: Japan Agency for Marine-Earth Science and Technology (JAMSTEC)
PROJECT TITLE:
PROJECT ID:
SUBMITTED BY: Alex Kozyr (Alex.Kozyr@noaa.gov)
SUBMISSION DATE: 2016-11-08
