Dataset: CTD

Name: Processed CTD data from all sensors mounted on the rosette from R/V Knorr cruise KN210-04 in the Western Atlantic Ocean between Uruguay and Barbados in 2013 (Deep Atlantic DOM project)
Published: 2014-01-14
Keywords: oceans

Cite This Dataset

DOI:10.1575/1912/bco-dmo.481164.1

Spatial Extent: N:9.703869 E:-23.999036 S:-38.0026 W:-55.304343

Temporal Extent: 2013-03-26 - 2013-05-06

Project:

Dissolved Organic Matter Composition in the Deep Atlantic Ocean (Deep Atlantic DOM)

Program:

Ocean Carbon and Biogeochemistry (OCB)

Center for Chemical Currencies of a Microbial Planet (C-CoMP)

Principal Investigator:

Elizabeth Kujawinski (Woods Hole Oceanographic Institution, WHOI)

Co-Principal Investigator:

Krista Longnecker (Woods Hole Oceanographic Institution, WHOI)

Contact:

Krista Longnecker (Woods Hole Oceanographic Institution, WHOI)

BCO-DMO Data Manager:

Shannon Rauch (Woods Hole Oceanographic Institution, WHOI BCO-DMO)

Version:

Version Date:

2014-01-14

Restricted:

Validated:

Yes

Current State:

Final no updates expected

Processed CTD data from all sensors mounted on the rosette from R/V Knorr cruise KN210-04 in the Western Atlantic Ocean between Uruguay and Barbados in 2013 (Deep Atlantic DOM project)

Abstract:

Processed CTD data from all sensors mounted on the rosette from the KN210-04 cruise. Data include temperature, salinity, dissolved oxygen, fluorometry, turbidity, PAR, and SPAR.

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Archival Copy

Version Date	Archive	Persistent Identifier	Date Assigned
2014-01-14	Marine Biological Laboratory/Woods Hole Oceanographic Institution Library (MBLWHOI DLA)	10.1575/1912/bco-dmo.481164.1	2019-11-21

Description

Processed CTD data from all sensors mounted on the rosette from the KN210-04 cruise. Data include temperature, salinity, dissolved oxygen, fluorometry, turbidity, PAR, and SPAR.

Methods & Sampling

The CTD rosette was provided by the Knorr Shipboard Science Support Group (SSSG) and was prepared for initial deployment by the SSSG representative on our cruise, Catie Graver. The system was a SBE9+ CTD with a depth limit of 6000m. The investigators used the dual SBE3T/SBE4C sensor system for temperature and conductivity. The rosette was also equipped with a SBE43 oxygen sensor, a Benthos/Datasonics PSA-916 altimeter, a Wet Labs FLNTURTD combination fluorometer and turbidity sensor, and a WetLabs C-star transmissometer (operating at a wavelength of 660 nm with a 25cm pathlength). For hydrocasts less than 1000m deep, the investigators attached a Biospherical Instruments QSP-200L4S underwater PAR sensor. This sensor was linked to a surface PAR sensor on the ship (QSR-240).

Data Processing Description

After the cruise, Krista Longnecker used SBE Data Processing to convert the data files, filter the data, remove wild edits, and bin average the data into 1-m bins. These processed data were exported to MATLAB and the SBE43 oxygen data were calibrated based on the discrete water samples analyzed during the cruise by Evan Howard (WHOI). Fluorescence values from the WET Labs ECO-AFL/FL have been converted from volts to milligrams per cubic meter using calibration values from WETLabs. The chlorophyll concentrations have not been further calibrated with discrete samples.

BCO-DMO Processing Notes:
- Parameter names were modified to conform with BCO-DMO naming conventions.
- lat_start and lon_start were added by joining the data to the event log and matching on the unique event number.
- Replaced 'NaN' and '-9.99E-29' with 'nd' to indicate 'no data'.

Data Files

File
CTD.csv (Comma Separated Values (.csv), 26.55 MB) MD5:656bb4ca4fc85dc44e7582a6cf26ffe5 Primary data file for dataset ID 481164

More Information about this dataset

Funding Sources

Funding Source	Award Number
NSF Division of Ocean Sciences	OCE-1154320

Deployments

Deployment	Synonyms	Start Date	Platform	Investigator
KN210-04	DeepDOM	2013-03-25	R/V Knorr	Elizabeth Kujawinski (Chief Scientist)	data info

Instruments

Altimeter

Supplied Name: Benthos/Datasonics PSA-916 altimeter

Supplied Description:

A Benthos/Datasonics PSA-916 altimeter was equipped on the CTD rosette.

Instrument Type

Generic Name: Altimeter

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/379/

Generic Description:

An instrument that measures height above a fixed surface. The data can be used to map ocean-surface topography and generate gridded surface height fields.

Biospherical QSP-200L underwater PAR Sensor

Supplied Name: Biospherical Instruments QSP-200L4S underwater PAR sensor

Supplied Description:

For hydrocasts less than 1000m deep, a Biospherical Instruments QSP-200L4S underwater PAR sensor was attached to the CTD rosette. This sensor was linked to a surface PAR sensor on the ship (QSR-240).

Instrument Type

Generic Name: Biospherical QSP-200L underwater PAR Sensor

Acronym: QSP-200L underwater PAR

Community Identifier: http://vocab.nerc.ac.uk/collection/L22/current/TOOL0070/

Generic Description:

Underwater radiometer with a PAR spectral response (400-700nm). Standard configuration had a spherical collector measuring 4-pi scalar irradiance but a flat plate cosine collector was available as an identically-designated option.

Biospherical QSR-240 surface PAR

Supplied Name: QSR-240 surface PAR sensor

Supplied Description:

For hydrocasts less than 1000m deep, a Biospherical Instruments QSP-200L4S underwater PAR sensor was attached to the CTD rosette. This sensor was linked to a surface PAR sensor on the ship (QSR-240).

Instrument Type

Generic Name: Biospherical QSR-240 surface PAR

Acronym: QSR-240

Community Identifier: http://vocab.nerc.ac.uk/collection/L22/current/TOOL0071/

Generic Description:

Shipboard radiometer with a PAR spectral response (400-700nm) designed to monitor surface irradiance during underwater light profile measurement. Hemispherical collector measuring 2-pi scalar irradiance.

CTD Sea-Bird SBE 911plus

Supplied Name: CTD SBE 911plus

Supplied Description:

Instrument Type

Generic Name: CTD Sea-Bird SBE 911plus

Acronym: CTD SBE 911plus

Community Identifier: http://vocab.nerc.ac.uk/collection/L22/current/TOOL0058/

Generic Description:

The Sea-Bird SBE 911 plus is a type of CTD instrument package for continuous measurement of conductivity, temperature and pressure. The SBE 911 plus includes the SBE 9plus Underwater Unit and the SBE 11plus Deck Unit (for real-time readout using conductive wire) for deployment from a vessel. The combination of the SBE 9 plus and SBE 11 plus is called a SBE 911 plus. The SBE 9 plus uses Sea-Bird's standard modular temperature and conductivity sensors (SBE 3 plus and SBE 4). The SBE 9 plus CTD can be configured with up to eight auxiliary sensors to measure other parameters including dissolved oxygen, pH, turbidity, fluorescence, light (PAR), light transmission, etc.). more information from Sea-Bird Electronics

Sea-Bird SBE 43 Dissolved Oxygen Sensor

Supplied Name: SBE43 oxygen sensor

Supplied Description:

An SBE43 oxygen sensor was equipped on the CTD rosette.

Instrument Type

Generic Name: Sea-Bird SBE 43 Dissolved Oxygen Sensor

Acronym: SBE-43 DO

Community Identifier: http://vocab.nerc.ac.uk/collection/L22/current/TOOL0036/

Generic Description:

The Sea-Bird SBE 43 dissolved oxygen sensor is a redesign of the Clark polarographic membrane type of dissolved oxygen sensors. more information from Sea-Bird Electronics

Sea-Bird SBE-3 Temperature Sensor

Supplied Name: Dual SBE3T/SBE4C

Supplied Description:

A dual SBE3T/SBE4C sensor system for temperature and conductivity was equipped on the CTD rosette.

Instrument Type

Generic Name: Sea-Bird SBE-3 Temperature Sensor

Acronym: SBE-3 Temperature

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/134/

Generic Description:

The SBE-3 is a slow response, frequency output temperature sensor manufactured by Sea-Bird Electronics, Inc. (Bellevue, Washington, USA). It has an initial accuracy of +/- 0.001 degrees Celsius with a stability of +/- 0.002 degrees Celsius per year and measures seawater temperature in the range of -5.0 to +35 degrees Celsius. more information from Sea-Bird Electronics

Sea-Bird SBE-4 Conductivity Sensor

Supplied Name: Dual SBE3T/SBE4C

Supplied Description:

A dual SBE3T/SBE4C sensor system for temperature and conductivity was equipped on the CTD rosette.

Instrument Type

Generic Name: Sea-Bird SBE-4 Conductivity Sensor

Acronym: SBE-4 Conductivity

Community Identifier: http://vocab.nerc.ac.uk/collection/L22/current/TOOL0417/

Generic Description:

The Sea-Bird SBE-4 conductivity sensor is a modular, self-contained instrument that measures conductivity from 0 to 7 Siemens/meter. The sensors (Version 2; S/N 2000 and higher) have electrically isolated power circuits and optically coupled outputs to eliminate any possibility of noise and corrosion caused by ground loops. The sensing element is a cylindrical, flow-through, borosilicate glass cell with three internal platinum electrodes. Because the outer electrodes are connected together, electric fields are confined inside the cell, making the measured resistance (and instrument calibration) independent of calibration bath size or proximity to protective cages or other objects.

WET Labs {Sea-Bird WETLabs} C-Star transmissometer

Supplied Name: WL CSTAR Trans

Supplied Description:

A WetLabs C-star transmissometer (operating at a wavelength of 660 nm with a 25cm pathlength) was equipped on the CTD rosette.

Instrument Type

Generic Name: WET Labs {Sea-Bird WETLabs} C-Star transmissometer

Acronym: WL CSTAR Trans

Community Identifier: http://vocab.nerc.ac.uk/collection/L22/current/TOOL0160/

Generic Description:

The C-Star transmissometer has a novel monolithic housing with a highly intgrated opto-electronic design to provide a low cost, compact solution for underwater measurements of beam transmittance. The C-Star is capable of free space measurements or flow-through sampling when used with a pump and optical flow tubes. The sensor can be used in profiling, moored, or underway applications. Available with a 6000 m depth rating.

More information on Sea-Bird website: https://www.seabird.com/c-star-transmissometer/product?id=60762467717

WetLabs FLNTU

Supplied Name: Wet Labs FLNTURTD

Supplied Description:

A Wet Labs FLNTURTD combination fluorometer and turbidity sensor was equipped on the CTD rosette.

Instrument Type

Generic Name: WetLabs FLNTU

Acronym: FLNTU

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/113/

Generic Description:

The WetLabs ECO FLNTU is a dual-wavelength, single-angle sensor for simultaneously determining both chlorophyll fluorescence and turbidity. It detects light scattered by particles suspended in water, generating an output voltage proportional to turbidity or suspended solids. Scaling factors are used to convert the voltage readings to values representing chlorophyll concentration and turbidity expressed in Nephelometric Turbidity Units (NTUs).

Parameters

Date and time formats are described in python strftime() syntax.

Supplied Name	Supplied description	Supplied Units	Standard Name
turbidity	Turbidity from WET Labs ECO. (Originally called 'tubWETntu0'.)	Nephelometric Turbidity Units (NTU)	turbidity
trans	Beam transmission from WET Labs C-Star. (Originally called 'CStarTr0'.)	percent (%)	trans
time_start_utc	Time (UTC) given as hour -- minute.	HHMM	time_utc
temp2	Temperature from secondary sensor on CTD. (Originally called 't190C'.).	degrees Celsius (ITS-90)	temp2
temp	Temperature from primary sensor on CTD. (Originally called 't090C'.)	degrees Celsius (ITS-90)	temp
station	Identification number of the sampling station.	dimensionless	station
spar	SPAR / surface irradiance.	microEinsteins per square meter per second (μE/m2-sec)	SPAR
sound_vel	Sound velociy. (Originally called 'svCM1'.)	meters per second (m/s) (Chen-Millero)	sound_vel
sal2	Salinity from secondary sensor on CTD. (Originally called 'sal11'.)	Practical Salinity Units (PSU)	sal2
sal	Salinity from primary sensor on CTD. (Originally called 'sal00'.)	Practical Salinity Units (PSU)	sal
press	Pressure. (Originally called 'prDM'.)	decibars (db)	press
par	PAR / irradiance from Biospherical/Licor.	microEinsteins per square meter per second (μE/m2-sec)	PAR
O2_mL_L	Oxygen from SBE43.	milliliters per liter (mL/L)	O2_ml_L
lon_start	Longitude at the time the event started (from the cruise event log).	decimal degrees	lon_start
longitude	Longitude.	decimal degrees	lon
lat_start	Latitude at the time the event started (from the cruise event log).	decimal degrees	lat_start
latitude	Latitude.	decimal degrees	lat
fluor	Fluorescence from WET Labs ECO-AFL/FL. (Originally called 'flECO_AFL'.)	milligrams per cubic meter (mg/m^3)	fluor
flag	Data quality flag.	dimensionless	flag
event_start	The event number from the ELOG maintained during the cruise.	dimensionless	event
depth	Depth. (Orignally called 'depSM'.)	meters	depth
density2	Density from secondary sensor on CTD. (Originally called 'density11'.)	kilograms per cubic meter (kg/m^3)	no_bcodmo_term
density	Density from primary sensor on CTD. (Originally called 'density00'.)	kilograms per cubic meter (kg/m^3)	density
date_start_utc	Date (UTC) given as 4-digit year -- 2-digit month -- 2-digit day in YYYYmmdd format.	unitless	date_utc
cast	Consecutive cast number for the instrument.	dimensionless	cast

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