Dataset: Mixed layer oxygen to argon
Deployment: KM1910

Mixed layer oxygen to argon

View Data: For data, See Dataset Metadata Page: https://www.bco-dmo.org/dataset/868774

Principal Investigator:

Sara Ferrón (University of Hawaii at Manoa, SOEST)

Contact:

Sara Ferrón (University of Hawaii at Manoa, SOEST)

BCO-DMO Data Manager:

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

Project:

EAGER Collaborative Research: Early career chief scientist training for biological and chemical oceanographers (Chief Sci KM1910)

Version:

Deployment Synonyms:

EAGER, Chief Sci cruise, 2019 Chief Scientist Training Cruise

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Description

Methods & Sampling

Dataset acquisition description

Samples for O2/Ar analyses were collected at three different depths within the mixed layer (5, 15, and 25 m) with 12-L Niskin® bottles attached to a CTD rosette. Seawater samples, collected in triplicate, were transferred to 12mL Labco Exetainer® screw cap vials with rubber septa. The vials were filled from the bottom using Tygon® tubing and allowed to overflow at least 3 times their volume. Samples were poisoned with 50 μL of saturated mercuric chloride solution and stored in the dark immersed in water at 4°C until analysis on board, within 2 days of collection.

Data Processing Description

Dataset Processing Description

Dissolved O2/Ar was measured in discrete water samples using membrane inlet mass spectrometry as described by Ferrón et al. (2015).

Membrane inlet mass spectrometer consists of a Pfeiffer Vacuum HiCube 80 Eco turbo pumping station connected to a HiQuayTM quadrupole mass spectrometer (QMG700), with a Balzers radio frequency generator (QMH 400-5) and a Balzers analyzer (QMA 430). The membrane inlet design is from Bay Instruments (Easton, Maryland).

BCO-DMO Processing Notes:
* Adjusted column names to comply with database requirements
* Added ISO8601 format of date and times

More information about this dataset deployment

Funding

Award Number	Funding Source
OCE-1911990	NSF Division of Ocean Sciences

Instruments

Membrane Inlet Mass Spectrometer

Supplied Name: Membrane inlet mass spectrometer

Supplied Description:

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.

Parameters

Supplied Name	Supplied description	Supplied Units	Standard Name
Cruise_ID	Cruise identification number	unitless	cruise_id
Sample_ID	Sample identification number	unitless	sample
Date	Date and time of CTD cast	UTC	DateTime
Latitude	Latitude, south is negative	decimal degrees	lat
Longitude	Longitude, west is negative	decimal degrees	lon
Cast	Cast number	unitless	cast
Niskin	Niskin bottle	unitless	bottle
Target_depth	Target depht	meters (m)	depth
MLD	Mixed layer depth, calculated following de Boyer Montégut et al. (2004), as the first depth where the potential density is at least 0.03 kg m−3 larger than the value at 10 m	meters (m)	depth
Temp	Conservative temperature	degrees Celsius (°C)	temp
Sal	Absolute salinity	g/kg	sal
Sig	Potential density	kg/m3	O2
O2_sol	Oxygen solubility determined from Garcia and Gordon (1992) solubility equations	mmol/m3	ratio
O2_Ar	Oxygen to Argon molar ratio.	mol O2/mol Ar	ratio
D_O2_Ar	Biological O2 saturation anomaly in percent. delta (O2/Ar) = [((O2/Ar)measured / (O2/Ar)equilibrium) - 1] * 100. Oxygen solubility determined from Garcia and Gordon (1992). Argon solubility solubility determined from Hamme and Emmerson (2004)	% (percent)	O2
ISO_DateTime_UTC	Sampling start date and time (UTC) in ISO8601 format: YYYY-MM-DDThh:mm:ssz	unitless	ISO_DateTime_UTC

Database

Contribute Data

Dataset: Mixed layer oxygen to argon
Deployment: KM1910

Dataset acquisition description

Dataset Processing Description

Database

Contribute Data

Dataset: Mixed layer oxygen to argonDeployment: KM1910

Dataset acquisition description

Dataset Processing Description

Dataset: Mixed layer oxygen to argon
Deployment: KM1910