Dataset: CTD and underwater mass spectrometer data - EN602
Deployment: EN602

View Data: For data, See Dataset Metadata Page: https://www.bco-dmo.org/dataset/828767

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)

Project:

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

Version:

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Description

Methods & Sampling

Dataset acquisition description

EN602: Departure port of Gulfport, MS to Narragansett Bay, Rhode Island. Problems with Triaxus overheating restricted data collection, to a region of the subtropical Atlantic between 28 N and 40 N. The ship track followed the same coordinates used during EN575.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

Dataset 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.

More information about this dataset deployment

Funding

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

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

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)	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
Depth	Sample depth	meters (m)	depth
Pressure	Pressure at depth	decibels (db)	press
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

Database

Contribute Data

Dataset: CTD and underwater mass spectrometer data - EN602
Deployment: EN602

Dataset acquisition description

Dataset Processing Description

Database

Contribute Data

Dataset: CTD and underwater mass spectrometer data - EN602Deployment: EN602

Dataset acquisition description

Dataset Processing Description

Dataset: CTD and underwater mass spectrometer data - EN602
Deployment: EN602