Dataset: PE23-20 Unbinned CTD

Name: Processed CTD data from 20 casts conducted on R/V Pelican cruise PE23-20 in the Northern Gulf of Mexico in May 2023
Published: 2023-09-12
Keywords: oceans

Cite This Dataset

DOI:10.26008/1912/bco-dmo.908001.1

Spatial Extent: N:28.8699 E:-90.4862 S:28.607 W:-91.6194

Temporal Extent: 2023-05-02 - 2023-05-06

Project:

CAREER: Investigating aerobic microbial respiration dynamics in coastal hypoxia (Coastal O2 Respir)

Principal Investigator:

J. Cameron Thrash (University of Southern California, USC)

BCO-DMO Data Manager:

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

Version:

Version Date:

2023-09-12

Restricted:

Validated:

Yes

Current State:

Final no updates expected

Processed CTD data from 20 casts conducted on R/V Pelican cruise PE23-20 in the Northern Gulf of Mexico in May 2023

Abstract:

This dataset includes the processed CTD data from 20 casts conducted on R/V Pelican cruise PE23-20 in the Northern Gulf of Mexico in May 2023. Data have not been binned by depth.

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Archival Copy

Version Date	Archive	Persistent Identifier	Date Assigned
2023-09-12	Marine Biological Laboratory/Woods Hole Oceanographic Institution Library (MBLWHOI DLA)	10.26008/1912/bco-dmo.908001.1	2023-09-22

Methods & Sampling

Sampling was conducted on R/V Pelican cruise PE23-20 in the Northern Gulf of Mexico in May 2023. All CTD casts were conducted according to standard ship operator procedure. Refer to the Cruise Plan (Supplemental File) for more information.

The data were collected using a SeaBird 911 plus system with twelve 12-liter Niskin bottles. The instruments included in the 911 plus suite are dual Temperature (SBE 3), dual Conductivity (SBE 4), and dual Oxygen (SBE 43) sensors. Additionally, the suite included an SBE 27 pH/Oxidation, Wetlabs ECO Fluorometer, and a Wetlabs CDOM sensor. Serial numbers and calibration information are stored in the Header Information included in the original .cnv files (see Supplemental Files for an example header file).

Data Processing Description

The data were processed using Seabird's SBEDataProccessing_Win32 software. The data were converted from hexadecimal to engineering units first. Using the software's Bin Averaging tool, the data were also averaged in bins of 1.0 meters. For the binned data, see the related dataset https://www.bco-dmo.org/dataset/907873. The attached Supplemental File contains the complete Seabird header from one cast (C6C_1).

BCO-DMO Processing

- Imported the original .cnv files (20 total; one per cast) into the BCO-DMO system.
- Captured the starting latitude, starting longitude, and starting date/time from the Seabird headers as columns.
- Concatenated the separate files into one dataset.
- Converted starting latitude and longitude to decimal degrees (rounded to 5 decimal places).
- Converted starting date/time to ISO8601 format.
- Created the Cast column based on the original file name.
- Renamed fields to comply with BCO-DMO parameter naming conventions.
- Saved the final file as "908001_v1_PE23-20_Un-binned_CTD.csv".

Data Files

File
908001_v1_PE23-20_Un-binned_CTD.csv (Comma Separated Values (.csv), 7.17 MB) MD5:f7e45755195133c275bde171a6306e90 Primary data file for dataset ID 908001, version 1.

Supplemental Files

File
Cruise_Plan_May2023_f.pdf (Portable Document Format (.pdf), 2.13 MB) MD5:934bced1024c455cb2323d66e1544d34 PE23-20 Cruise Plan
PE23-20_unbinned_CTD_header_file.txt (Plain Text, 12.48 KB) MD5:80280616519c174d6bb3968597629fcb Supplemental file for dataset ID 908001, version 1. Example of a CTD header file extracted from the original .cnv file named "CTD_C6C_1_converted.cnv"

More Information about this dataset

Funding Sources

Funding Source	Award Number
NSF Division of Ocean Sciences	OCE-1945279

Deployments

Deployment	Synonyms	Start Date	Platform	Investigator
PE23-20	Microbial DO respir Coastal O2 Respir	2023-05-01	R/V Pelican	J. Cameron Thrash (Chief Scientist)	data info

Instruments

CTD Sea-Bird SBE 911plus

Supplied Name: SeaBird 911 plus system

Supplied Description:

SeaBird 911 plus system with twelve 12-liter Niskin bottles

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: Wetlabs ECO 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.

Fluorometer

Supplied Name: Wetlabs CDOM

Supplied Description:

Instrument Type

Generic Name: Fluorometer

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

Generic Description:

Niskin bottle

Supplied Name: 12-liter Niskin bottles

Supplied Description:

Instrument Type

Generic Name: Niskin bottle

Community Identifier: http://vocab.nerc.ac.uk/collection/L22/current/TOOL0412/

Generic Description:

A Niskin bottle (a next generation water sampler based on the Nansen bottle) is a cylindrical, non-metallic water collection device with stoppers at both ends. The bottles can be attached individually on a hydrowire or deployed in 12, 24, or 36 bottle Rosette systems mounted on a frame and combined with a CTD. Niskin bottles are used to collect discrete water samples for a range of measurements including pigments, nutrients, plankton, etc.

Sea-Bird SBE 27 pH/O.R.P. sensor

Supplied Name: SBE 27 pH/Oxidation

Supplied Description:

Instrument Type

Generic Name: Sea-Bird SBE 27 pH/O.R.P. sensor

Acronym: SBE 27 pH/Oxidation sensor

Generic Description:

The SBE 27 pH and O.R.P. (Redox) sensor combines a pressure-balanced, glass-electrode, Ag/AgCl reference probe and platinum O.R.P. electrode to provide in-situ measurements at depths to 1200 m. The replaceable pH probe is permanently sealed and is supplied with a soaker bottle attachment that prevents the reference electrode from drying out during storage. The SBE 27 is intended for use as an add-on auxiliary sensor for profiling CTDs (SBE 9plus; SBE 19, 19plus, and 19plus V2 SeaCAT; and SBE 25 and 25plus Sealogger).

Sea-Bird SBE 43 Dissolved Oxygen Sensor

Supplied Name: dual Oxygen (SBE 43) sensors

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

Sea-Bird SBE-3 Temperature Sensor

Supplied Name: dual Temperature (SBE 3) sensors

Supplied Description:

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 Conductivity (SBE 4) sensors

Supplied Description:

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.

Parameters

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

Supplied Name	Supplied description	Supplied Units	Standard Name
Cast	Cast identifier	unitless	cast
Lat_Start	Latitude at start of cast	degrees North	lat
Lon_Start	Longitude at start of cast (negative values = West)	degrees East	lon
ISO_DateTime_Start_UTC	Date and time (UTC) at start of cast Format: %Y-%m-%dT%H:%M:%SZ	unitless	ISO_DateTime_UTC
altM	Altimeter	meters (m)	altitude
avgsvCM	Average Sound Velocity (Chen-Millero)	meters per second (m/s)	sound_vel
nbf	Number of bottles fired	unitless	number
c0S_m	Conductivity	Siemens per meter (S/m)	cond
c1S_m	Conductivity, 2	Siemens per meter (S/m)	cond
depSM	Depth (salt water)	meters (m)	depth
dz_dtM	Descent rate	meters per second (m/s)	descent_rate
flECO_AFL	Fluorescence, WET Labs ECO-AFL/FL	milligrams per cubic meter (mg/m^3)	fluor
wetCDOM	Fluorescence, WET Labs CDOM	milligrams per cubic meter (mg/m^3)	fluor
latitude	Latitude	degrees North	lat
longitude	Longitude (negative values = West)	degrees East	lon
sbeox0Mg_L	Oxygen, SBE 43	milligrams per liter (mg/L)	O2
sbeox1Mg_L	Oxygen, SBE 43, 2	milligrams per liter (mg/L)	O2
ptempC	Pressure temperature	degrees Celsius	temp
prDM	Pressure, Digiquartz	decibars (db)	press
sal00	Salinity, Practical	PSU	sal
ph	pH	unitless (pH scale)	pH
svCM	Sound Velocity (Chen-Millero)	meters per second (m/s)	sound_vel
spar	SPAR, Biospherical/Licor	micromoles photons per square meter per second (umol photons/m^2/sec)	SPAR
t090C	Temperature (ITS-90)	degrees Celsius	temp
t190C	Temperature, 2 (ITS-90)	degrees Celsius	temp
timeS	Time elapsed	seconds	time_elapsed
timeM	Time elapsed	minutes	time_elapsed
flag	Flag	unitless	flag

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Dataset: PE23-20 Unbinned CTD