Dataset: Carbonate Chemistry and CTD
Deployment: KM1712

Water samples were collected at 24 different depths during each CTD cast. Temperature, salinity, [O2], density and fluorescence were measured in situ both downcast and upcast. After CTD recovery, water samples were collected and DIC, pH, d13C of DIC were measured onboard. Other parameters in the carbonate system were calculated using CO2SYS.

DIC and d13C were measured using a Picarro Cavity Ring-Down Spectroscopy (G2131-i). pH was measured using a Varian Cary 400 spectrophotometer. The CTD included a rosette of 24 10L bottles.

Data columns d13C_DIC_PDB_USC1 and d13C_DIC_PDB_USC2 were measured by the USC and Caltech groups. All other data columns to the right (d13C_DIC_PDB_USF1 and d13C_DIC_PDB_USF2, Alk, DIC, pH, OmegaCa, and OmegaAr) were measured by the USF group.

Data Processing Description

Dataset Processing Description

BCO-DMO Processing:
Version 1:
- renamed fields;
- converted latitude and longitude to decimal degrees.
Version 2:
- renamed fields;
- converted latitude and longitude to decimal degrees.

Version History:
Version 1 of this dataset was replaced by version 2 on 2022-01-31. Version 2 contains additional measurements (water column densities, nutrients, and AOUs) and has the CTD downcast columns removed. In version 2, only the mean values for duplicate measurements in the carbonate system parameters are reported.

More information about this dataset deployment

Funding

Award Number	Funding Source
OCE-1220302	NSF Division of Ocean Sciences
OCE-1220600	NSF Division of Ocean Sciences
OCE-1559004	NSF Division of Ocean Sciences

Instruments

Cavity enhanced absorption spectrometers

Supplied Name: Picarro Cavity Ring-Down Spectroscopy (G2131-i)

Supplied Description:

Instrument Type

Generic Name: Cavity enhanced absorption spectrometers

Acronym: CEAS

Generic Description:

Instruments that illuminate a sample inside an optical cavity, typically using laser light, and measure the concentration or amount of a species in gas phase by absorption spectroscopy. Techniques include cavity ring-down spectroscopy (CRDS) and integrated cavity output spectroscopy (ICOS).

CTD - profiler

Supplied Name: CTD with 24 bottle rosette

Supplied Description:

Instrument Type

Generic Name: CTD - profiler

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/130/

Generic Description:

The Conductivity, Temperature, Depth (CTD) unit is an integrated instrument package designed to measure the conductivity, temperature, and pressure (depth) of the water column. The instrument is lowered via cable through the water column. It permits scientists to observe the physical properties in real-time via a conducting cable, which is typically connected to a CTD to a deck unit and computer on a ship. The CTD is often configured with additional optional sensors including fluorometers, transmissometers and/or radiometers. It is often combined with a Rosette of water sampling bottles (e.g. Niskin, GO-FLO) for collecting discrete water samples during the cast.

This term applies to profiling CTDs. For fixed CTDs, see https://www.bco-dmo.org/instrument/869934.

Spectrophotometer

Supplied Name: Varian Cary 400 spectrophotometer

Supplied Description:

Instrument Type

Generic Name: Spectrophotometer

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/LAB20/

Generic Description:

An instrument used to measure the relative absorption of electromagnetic radiation of different wavelengths in the near infra-red, visible and ultraviolet wavebands by samples.

Parameters

Supplied Name	Supplied description	Supplied Units	Standard Name
Station	station number	unitless	station
CastNo	cast number	unitless	cast
Latitude	latitude	decimal degrees North	lat
Longitude	longitude	decimal degrees East	lon
Bottle	bottle number	unitless	bottle
Depth	ctd depth	meters	depth
Pressure	water pressure at depth	decibars (dbar)	press
Temp	Water temparature	degrees Celsius	temp
Sal	salinity	psu	sal
O2	oxygen concentration	micromoles per kilogram	O2
Density	seawater density	kilogram per cubic meter	density
Fluorescence	fluorescence concentration	milligrams per cubic meter	fluor
Theta	Potential temperature	degrees Celsius	potemp
Density_anomaly	Density anomaly from 1000 kg/m3	kilograms per cubic meter	no_bcodmo_term
Sigma0	Sigma-theta referenced to surface pressure	kilograms per cubic meter	sigma_0
Sigma4	Density anomaly referenced to 4 km	kilograms per cubic meter	no_bcodmo_term
Phosphate	phosphate concentration	micromoles per kilogram	PO43-
Nitrate	nitrate concentration	micromoles per kilogram	NO3
Silicate	silicate concentration	micromoles per kilogram	Silicate
AOU	aparent oxygen utilization	micromoles per kilogram	AOU
Alk	total alkalinity	micromoles per kilogram	TALK
DIC	dissolved inorganic carbon	micromoles per kilogram	DIC
d13C_DIC	isotopic cmposition of DIC	per mil (‰)	d13C_DIC
pHTpTS	pH at in situ temperature and pressure conditions	unitless	pH
pHTp0T25S	pH at 25 °C and surface pressure	unitless	pH
OmegaCa_Alk_DIC_PTS	calcite saturation state	unitless	OM_ca
OmegaCa_Alk_pH_corr_PTS	calcite saturation state	unitless	OM_ca
OmegaCa_pH_corr_DIC_PTS	calcite saturation state	unitless	OM_ca
OmegaAr_Alk_DIC_PTS	aragonite saturation state	unitless	OM_ar
OmegaAr_Alk_pH_incorr_PTS	aragonite saturation state	unitless	OM_ar
OmegaAr_pH_corr_DIC_PTS	aragonite saturation state	unitless	OM_ar

Database

Contribute Data

Dataset: Carbonate Chemistry and CTD
Deployment: KM1712

Dataset acquisition description

Dataset Processing Description

Database

Contribute Data

Dataset: Carbonate Chemistry and CTDDeployment: KM1712

Dataset acquisition description

Dataset Processing Description

Dataset: Carbonate Chemistry and CTD
Deployment: KM1712