Dataset: CTD and underwater mass spectrometer data - EN575

Name: CTD and underwater mass spectrometer data acquired in 2016 aboard the RV/Endeavor (cruise EN575) in the the subtropical Atlantic using a Triaxus tow vehicle.
Published: 2021-03-03
Keywords: O2/Ar, triaxus, SWIMS, underwater mass spectrometer, photic zone gases, oceans

Cite This Dataset

DOI:10.26008/1912/bco-dmo.843222.1

Spatial Extent: N:39.8138 E:-71.4505 S:27.61 W:-76.8814

Temporal Extent: 2016-03-04 - 2016-03-11

Project:

Collaborative Research: Inventories of Primary Productivity by In-situ Mass Spectrometry in the Upper Ocean (ZIPP)

Principal Investigator:

Brice Loose (University of Rhode Island, URI)

Co-Principal Investigator:

R. Timothy Short (SRI International, SRI)

Scientist:

Richard D. Ricketts (University of Minnesota Duluth)

Strawn Toler (SRI International, SRI)

Contact:

Brice Loose (University of Rhode Island, URI)

Technician:

Jason Agnich (University of Minnesota Duluth)

Erich Gruebel (University of Rhode Island, URI)

BCO-DMO Data Manager:

Karen Soenen (Woods Hole Oceanographic Institution, WHOI BCO-DMO)

Version:

Version Date:

2021-03-03

Restricted:

Validated:

Yes

Current State:

Final no updates expected

CTD and underwater mass spectrometer data acquired in 2016 aboard the RV/Endeavor (cruise EN575) in the the subtropical Atlantic using a Triaxus tow vehicle.

Abstract:

CTD and underwater mass spectrometer data acquired in 2016 aboard the RV/Endeavor (cruise EN575) in the the subtropical Atlantic using a Triaxus tow vehicle.

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Archival Copy

Version Date	Archive	Persistent Identifier	Date Assigned
2021-03-03	Marine Biological Laboratory/Woods Hole Oceanographic Institution Library (MBLWHOI DLA)	10.26008/1912/bco-dmo.843222.1	2021-03-16

Methods & Sampling

Data collected from Pt. Everglades, Florida to Narragansett Bay, Rhode Island, crossing Gulf Stream and several mesoscale eddies between 28 and 40 N. The SWIMS instrument uses a quadrupole mass analyzer to measure in-situ gas concentration. Ion currents were calibrated using an in-situ calibration technique and a Recurrent Neural Network to remove bias introduced by pressure and temperature changes on the membrane inlet.

In this application we towed the mass-spectrometer through water depths from 0 to 150 m aboard a Triaxus tow vehicle, corresponding to region where sunlight penetrates the surface ocean. The SWIMS was used to measure oxygen, argon, carbon dioxide, and nitrogen in seawater.

Data Processing Description

Data from Triaxus CTD and SWIMS was merged in real time.

Post-processing includes:

Introduction of a 21 second lag between CTD and SWIMS data, because SWIMS measurements pass through inlet tubing with 21 second travel time.
Wild_edit Seabird-like removal of values that fall outside 5 standard deviations of the mean.
Linear interpolation across data gaps.
SWIMS ion current has been corrected to remove the effects of hydrostatic pressure and temperature on the membrane permeation rate. Details of the method can be found at https://doi.org/10.3389/feart.2020.537028.
Calibration is carried out in-situ, using a known reference standard of equilibrated seawater, pumped from a gas-tight foil bag.

Data Files

File
swims_en575.csv (Comma Separated Values (.csv), 15.20 MB) MD5:e6edf8b5bc0b621b7af16327506461f4 Primary data file for dataset ID 843222

More Information about this dataset

Funding Sources

Funding Source	Award Number
NSF Division of Ocean Sciences	OCE-1429940

Deployments

Deployment	Synonyms	Start Date	Platform	Investigator
EN575		2016-03-03	R/V Endeavor	Brice Loose (Chief Scientist)	data info

Instruments

CTD Sea-Bird MicroCAT 37

Supplied Name: SBE 37

Supplied Description:

Triaxus tow vehicle from U. Of Minnesota, Duluth, equipped with SBE 37, SBE43, and Wetlabs ECOpuck.

Instrument Type

Generic Name: CTD Sea-Bird MicroCAT 37

Acronym: CTD MicroCAT 37

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/350/

Generic Description:

The Sea-Bird MicroCAT CTD unit is a high-accuracy conductivity and temperature recorder based on the Sea-Bird SBE 37 MicroCAT series of products. It can be configured with optional pressure sensor, internal batteries, memory, built-in Inductive Modem, integral Pump, and/or SBE-43 Integrated Dissolved Oxygen sensor. Constructed of titanium and other non-corroding materials for long life with minimal maintenance, the MicroCAT is designed for long duration on moorings.

In a typical mooring, a modem module housed in the buoy communicates with underwater instruments and is interfaced to a computer or data logger via serial port. The computer or data logger is programmed to poll each instrument on the mooring for its data, and send the data to a telemetry transmitter (satellite link, cell phone, RF modem, etc.). The MicroCAT saves data in memory for upload after recovery, providing a data backup if real-time telemetry is interrupted.

Membrane Inlet Mass Spectrometer

Supplied Name: SWIMS

Supplied Description:

SWIMS: Submersible Wet Inlet Mass Spectrometer is a membrane inlet mass spectrometer that is submersible to 2000 m and samples every 2 seconds for pre-chosen masses.

Instrument Type

Generic Name: Membrane Inlet Mass Spectrometer

Acronym: MIMS

Generic Description:

Membrane-introduction mass spectrometry (MIMS) is a method of introducing analytes into the mass spectrometer's vacuum chamber via a semipermeable membrane.

Sea-Bird SBE 43 Dissolved Oxygen Sensor

Supplied Name: SBE43

Supplied Description:

Triaxus tow vehicle from U. Of Minnesota, Duluth, equipped with SBE 37, SBE43, and Wetlabs ECOpuck.

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

towed undulating vehicle

Supplied Name: Triaxus Tow Vehicle

Supplied Description:

Triaxus tow vehicle from U. Of Minnesota, Duluth

Instrument Type

Generic Name: towed undulating vehicle

Acronym: TUV

Generic Description:

A towed undulating vehicle is a generic class of instruments. See the data set specific information for a detailed description. These are often prototype instrument packages designed to make very specific measurements.

Wet Labs ECO Puck

Supplied Name: Wetlabs ECOpuck

Supplied Description:

Triaxus tow vehicle from U. Of Minnesota, Duluth, equipped with SBE 37, SBE43, and Wetlabs ECOpuck.

Instrument Type

Generic Name: Wet Labs ECO Puck

Generic Description:

The Puck is a miniature version of the ECO series of sensors, specifically designed for use in AUVs, profiling floats, and Slocum gliders with a dry science bay. This compact optical sensor is available in combinations of backscattering and fluorescence measurements.
Manufacturer's website: https://www.seabird.com/auv-rov-sensors/eco-puck/family?productCategoryId=55352274651

Parameters

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

Supplied Name	Supplied description	Supplied Units	Standard Name
ISO_DateTime_UTC	DateTime of sample in UTC time zone and ISO format (yyy-mm-ddThh:mm:ss) Format: %Y-%m-%dT%H:%M:%SZ	unitless	ISO_DateTime_UTC
Latitude	Latitude of sampling location, west is negative	decimal degrees	lat
Longitude	Longitude of sampling location, south is negative	decimal degrees	lon
Pressure	Pressure at depth	decibels (db)	press
Depth	Sample depth	meters (m)	depth
Temperature	In situ temperature	degrees Celsius (°C)	temp
Salinity	In situ salinity	PSU	sal
Oxygen	In situ dissolved oxygen from MicroCAT CTD	umol/kg	O2
Fluorescence_CDOM	In situ fluorescence	milligrams per cubic meter (mg/m3)	fluor
Beam_Transmission	In situ light transmission	percentage (%)	trans
PAR	In situ photosynthetically active radiation	unitless	PAR
N2	In situ dissolved Nitrogen from SWIMS	umol/kg	N
O2	In situ dissolved oxygen from SWIMS	umol/kg	O2
Argon	In situ dissolved Argon from SWIMS	umol/kg	Argon
CO2	In situ dissolved Carbon Dioxide from SWIMS	umol/kg	CO2

Database

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Dataset: CTD and underwater mass spectrometer data - EN575