Dataset: GP17-OCE CTD Profiles

Name: Processed CTD profile data from both rosettes (GTC and ODF) deployed on the US GEOTRACES GP17-OCE cruise on R/V Roger Revelle (RR2214) from December 2022 to January 2023
Published: 2024-12-01
Keywords: oceans

View Data: Data not available yet

Cite This Dataset

Spatial Extent: N:-19.9998 E:-75.0972 S:-67.0002 W:-152.00031

Temporal Extent: 2022-12-03 - 2023-01-24

Project:

US GEOTRACES GP17 Section: South Pacific and Southern Ocean (GP17-OCE) (GP17-OCE)

Program:

U.S. GEOTRACES (U.S. GEOTRACES)

Principal Investigator:

Benjamin Twining (Bigelow Laboratory for Ocean Sciences)

Co-Principal Investigator:

Gregory A. Cutter (Old Dominion University, ODU)

Jessica N. Fitzsimmons (Texas A&M University, TAMU)

BCO-DMO Data Manager:

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

Version:

Version Date:

2024-12-01

Restricted:

Validated:

Current State:

Data not available

Processed CTD profile data from both rosettes (GTC and ODF) deployed on the US GEOTRACES GP17-OCE cruise on R/V Roger Revelle (RR2214) from December 2022 to January 2023

Abstract:

This dataset includes the processed CTD profile data from both rosettes (GTC and ODF) deployed on the US GEOTRACES GP17-OCE cruise on R/V Roger Revelle (RR2214) from December 2022 to January 2023. Data are binned to 2 meters. Data were processed by the Oceanographic Data Facility (ODF) at Scripps Institution of Oceanography.

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Description

Processed CTD profile data from both rosettes. Data are binned to 2 meters.

Methods & Sampling

Excerpts from the GP17-OCE Cruise Report:

The Cutter group (ODU) and the East Coast van and winch pools provided the GEOTRACES Trace Element Carousel sampling system (GTC), including the A-frame, Dynacon winch with 7300 m of Vectran cable with conductors, clean lab van, and Seabird 9/11+ carousel/CTD with 24 x 12L Go-Flo bottles (+spares).

The GTC sensor array was re-calibrated immediately prior to the GP17-OCE cruise. The sensor array consisted of dual SBE-9 temperature and salinity sensors (calibration date: 23 June 2022), an SBE-43 dissolved oxygen sensor (calibration date: 9 Aug 2022), a Seapoint fluorometer, a Benthos altimeter, and a WetLabs C-Star transmissometer (calibration date: 12 July 2022). The "Salinity-2" sensor on the CTD physically broke after Station 36 and was replaced with a spare calibrated from the same set (and calibration values updated accordingly). The Bishop (UC Berkeley), Lam (UC Santa Cruz), and Ohnemus (UGA Skidaway) groups also installed on the GTC a birefringence sensor that detects particulate inorganic carbon (PIC) at all stations/depths (observed as “Voltage 7” in the GTC CTD data). The Fitzsimmons lab (TAMU) also installed a logging, non-conducting MAPR (Miniature Autonomous Plume Recorder) sensor suite on the rosette frame at deep casts of Stations 18 and 20 in order to collect turbidity and oxidationreductional potential data near the hydrothermal plumes.

The 36-place Scripps ODF rosette was used to sample water for less contamination-prone elements. Cutter (ODU, co-cruise leader), along with Marty Fleisher (LDEO) and Jule Middleton (WHOI) were responsible for managing the water budget and overall sampling of the ODF rosette.

For more information on CTD deployments and processing, see the cruise report available from BODC at https://www.bodc.ac.uk/resources/inventories/cruise_inventory/reports/rogerrevelle_rr2214.pdf

Data Processing Description

WOCE CTD Quality Code descriptions can be found at https://exchange-format.readthedocs.io/en/latest/quality.html#ctd-quality-codes, and are replicated below:

1: Not calibrated.

2: Acceptable measurement.

3: Questionable measurement.

4: Bad measurement.

5: Not reported.

6: Interpolated over a pressure interval larger than 2 dbar.

7: Despiked.

(8): Not used for CTD data.

9: Not sampled.

BCO-DMO Processing

- Imported original file "data_from_WHP_CTD_Collection_2023-11-20T11-23-11.txt" into the BCO-DMO system.
- Renamed fields to comply with BCO-DMO naming conventions.
- Converted the date/time column to ISO 8601 format and renamed the column "ISO_DateTime_UTC".
- Added column for Longitude on -180 to 180 scale.
- Removed empty columns: EXPOOCODE, SECT_ID, STNNBR, CRUISE REPORT, SOURCE FILE NAME.
- Saved the final file as "944794_v1_gp17-oce_ctd_profiles.csv".

More Information about this dataset

Funding Sources

Funding Source	Award Number
NSF Division of Ocean Sciences	OCE-2023206
NSF Division of Ocean Sciences	OCE-2023237
NSF Division of Ocean Sciences	OCE-2023315

Deployments

Deployment	Synonyms	Start Date	Platform	Investigator
RR2214	GP17 GP17-OCE 33RR20221201	2022-12-01	R/V Roger Revelle	Benjamin Twining (Chief Scientist) Gregory A. Cutter (Co-Chief Scientist) Jessica N. Fitzsimmons (Co-Chief Scientist)	data info

Instruments

Altimeter

Supplied Name:

Supplied Description:

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.

CTD Sea-Bird 9

Supplied Name:

Supplied Description:

Instrument Type

Generic Name: CTD Sea-Bird 9

Acronym: CTD SBE 9

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

Generic Description:

The Sea-Bird SBE 9 is a type of CTD instrument package. The SBE 9 is the Underwater Unit and is most often combined with the SBE 11 Deck Unit (for real-time readout using conductive wire) when deployed from a research vessel. The combination of the SBE 9 and SBE 11 is called a SBE 911. The SBE 9 uses Sea-Bird's standard modular temperature and conductivity sensors (SBE 3 and SBE 4). The SBE 9 CTD can be configured with auxiliary sensors to measure other parameters including dissolved oxygen, pH, turbidity, fluorometer, altimeter, etc.). Note that in most cases, it is more accurate to specify SBE 911 than SBE 9 since it is likely a SBE 11 deck unit was used. more information from Sea-Bird Electronics

CTD Sea-Bird SBE 911plus

Supplied Name:

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

Fluorometer

Supplied Name: Seapoint fluorometer

Supplied Description:

Instrument Type

Generic Name: Fluorometer

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

Generic Description:

A fluorometer or fluorimeter is a device used to measure parameters of fluorescence: its intensity and wavelength distribution of emission spectrum after excitation by a certain spectrum of light. The instrument is designed to measure the amount of stimulated electromagnetic radiation produced by pulses of electromagnetic radiation emitted into a water sample or in situ.

Sea-Bird SBE 43 Dissolved Oxygen Sensor

Supplied Name:

Supplied Description:

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

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

Supplied Name:

Supplied Description:

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

Parameters

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

Supplied Name	Supplied description	Supplied Units	Standard Name
Cruise	Cruise ID and EXPOCODE	unitless	cruise_id
Station	Station number	unitless	station
Type	Data type; C = CTD	unitless	cast_type
ISO_DateTime_UTC	Date and time (UTC) in ISO 8601 format Format: %Y-%m-%dT%H:%M:%SZ	unitless	ISO_DateTime_UTC
Longitude_360	Longitude in degrees East (0 to 360)	decimal degrees	lon_360
Longitude	Longitude in degrees East (-180 to 180); negative values = West direction	decimal degrees	lon
Latitude	Latitude in degrees North; negative values = South direction	decimal degrees	lat
Bot_Depth	Bottom depth	meters (m)	depth_bottom
Comments	Comments/notes	unitless	comment
CTDPRS	The corrected pressure as measured by the CTD	decibars (db)	press
QV_WOCECTD_CTDPRS	WOCE quality flag for CTD data	unitless	q_flag
CTDTMP	The corrected temperature as measured by the CTD [ITS-90]	degrees Celsius	temp
QV_WOCECTD_CTDTMP	WOCE quality flag for CTD data	unitless	q_flag
CTDSAL	The corrected practical salinity as measured (calculated) by the CTD [PSS-78]	PSU	sal
QV_WOCECTD_CTDSAL	WOCE quality flag for CTD data	unitless	q_flag
CTDOXY	The corrected oxygen measured by the CTD	micromoles per kilogram (umol/kg)	O2
QV_WOCECTD_CTDOXY	WOCE quality flag for CTD data	unitless	q_flag
CTDXMISS	Transmissometer reading in volts	0-5 volts direct current (VDC)	trans_v
QV_WOCECTD_CTDXMISS	WOCE quality flag for CTD data	unitless	q_flag
CTDFLUOR	Fluorometer reading in volts	0-5 volts direct current (VDC)	fluor
QV_WOCECTD_CTDFLUOR	WOCE quality flag for CTD data	unitless	q_flag
CTDORP	Oxidation-reduction (or redox) potential sensor	millivolts	Ox_Red
QF_CTDORP	WOCE quality flag for CTD data	unitless	q_flag
CTDTURB	Turbidity reading in FTU	FTU	turbidity
QF_CTDTURB	WOCE quality flag for CTD data	unitless	q_flag
QV_WOCECTD_SAMPLE	WOCE quality flag for CTD data	unitless	q_flag

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Dataset: GP17-OCE CTD Profiles