Dataset: AE1812 Water column phosphate data
Deployment: AE1812

AE1812 water column phosphates

Principal Investigator:

Benjamin A.S. Van Mooy (Woods Hole Oceanographic Institution, WHOI)

Co-Principal Investigator:

Tatiana A. Rynearson (University of Rhode Island, URI-GSO)

BCO-DMO Data Manager:

Nancy Copley (Woods Hole Oceanographic Institution, WHOI BCO-DMO)

Project:

Collaborative Research: Defining the biogeochemical drivers of diatom physiological ecology in the North Atlantic (North Atlantic Diatoms)

Redox Cycling of Phosphorus in the Western North Atlantic Ocean (Phosphorus Redox Cycling)

Data URL:

https://www.bco-dmo.org/dataset-deployment/762830/data

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Description

This dataset includes water column phosphate data from RV/Atlantic Explorer AE1812, May 2018.

Methods & Sampling

Dataset acquisition description

MAGIC Soluble reactive phosphorus (SRP) concentrations. SRP (i.e. phosphate) was determined in seawater samples (done in triplicate) and incubations using MAGnesium Induced Coprecipitation (MAGIC) as described by Karl and Tien (1992).

Total particulate phosphorus (TTP) concentrations. TPP was determined in seawater samples using a wet chemical oxidation method using potassium persulfate as described in Suzumura (2008). Briefly, 1 to 2 liters of seawater were filtered onto 47 mm 0.2 µm pore size polyvinylidene fluoride membranes (Millipore) and frozen (-80°C) until analysis. One fourth of these filters were cut with clean stainless-steel scissors and placed in 8 mL glass vials for oxidation. 2 mL of 5% (0.19 M) persulfate was added to each vial and the samples were then autoclaved for 30 minutes at 120°C. To remove any residual material, the samples were filtered through 0.45 µm syringe filters (Millipore Millex-HV). The persulfate was shown to inhibit color development when greater than 2%, therefore, the samples were diluted to 0.5% (0.019 M). As with the SRP samples, the TPP samples were analyzed via the molybdenum blue method using a spectrophotometer (Thermo).

Data Processing Description

Dataset Processing Description

BCO-DMO Processing:
- added conventional header with dataset name, PI name, version date
- modified parameter names to conform with BCO-DMO naming conventions
- re-formatted date from m/d/yyyy to yyyy-mm-dd

More information about this dataset deployment

Funding

Award Number	Funding Source
OCE-1536346	NSF Division of Ocean Sciences
OCE-1558490	NSF Division of Ocean Sciences
OCE-1558506	NSF Division of Ocean Sciences

Instruments

Centrifuge

Supplied Name:

Supplied Description:

Used to collect precipitate for soluble reactive phosphorus (SRP) measurements.

Instrument Type

Generic Name: Centrifuge

Generic Description:

A machine with a rapidly rotating container that applies centrifugal force to its contents, typically to separate fluids of different densities (e.g., cream from milk) or liquids from solids.

CTD - profiler

Supplied Name:

Supplied Description:

Instrument Type

Generic Name: CTD - profiler

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

Generic Description:

The Conductivity, Temperature, Depth (CTD) unit is an integrated instrument package designed to measure the conductivity, temperature, and pressure (depth) of the water column. The instrument is lowered via cable through the water column. It permits scientists to observe the physical properties in real-time via a conducting cable, which is typically connected to a CTD to a deck unit and computer on a ship. The CTD is often configured with additional optional sensors including fluorometers, transmissometers and/or radiometers. It is often combined with a Rosette of water sampling bottles (e.g. Niskin, GO-FLO) for collecting discrete water samples during the cast.

This term applies to profiling CTDs. For fixed CTDs, see https://www.bco-dmo.org/instrument/869934.

Niskin bottle

Supplied Name:

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.

Sediment Trap - Particle Interceptor

Supplied Name: free-floating NetTrap

Supplied Description:

"Based on the design of a closing plankton net capable of collecting large amounts (~1 g) of very fresh sinking particulate material in short time periods (24-36 h) to facilitate microbial decomposition experiment." (Peterson et al, 2005)

Instrument Type

Generic Name: Sediment Trap - Particle Interceptor

Acronym: Sed Trap - Part Int

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/33/

Generic Description:

A Particle Interceptor Trap is a prototype sediment trap designed in the mid 1990s to segregate 'swimmers' from sinking particulate material sampled from the water column. The prototype trap used 'segregation plates' to deflect and segregate 'swimmers' while a series of funnels collected sinking particles in a chamber (see Dennis A. Hansell and Jan A. Newton. September 1994. Design and Evaluation of a "Swimmer"-Segregating Particle Interceptor Trap, Limnology and Oceanography, Vol. 39, No. 6, pp. 1487-1495).

Shipboard Incubator

Supplied Name:

Supplied Description:

Instrument Type

Generic Name: Shipboard Incubator

Generic Description:

A device mounted on a ship that holds water samples under conditions of controlled temperature or controlled temperature and illumination.

Spectrophotometer

Supplied Name: spectrophotometer (Thermo)

Supplied Description:

Used to measure total particulate phosphate concentrations

Instrument Type

Generic Name: Spectrophotometer

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/LAB20/

Generic Description:

An instrument used to measure the relative absorption of electromagnetic radiation of different wavelengths in the near infra-red, visible and ultraviolet wavebands by samples.

Parameters

Supplied Name	Supplied description	Supplied Units	Standard Name
Date	UTC Sampling date formatted as yyyy-mm-dd.	unitless	date_utc
Depth	Depth at which the samples were collected.	meters	depth
Station	Numeric identifier for the station where the data was collected.	unitless	station
CTD_Cast	Numeric identifier for the CTD cast where the data was collected.	unitless	cast
Lat	Latitude of sampling. Positiv evalues indicate North.	decimal degrees	lat
Long	Longitude of sampling. Negative values indicate West.	decimal degrees	lon
MAGIC_SRP	Soluble reactive phosphorus measured by magnesium induced co-precipitation.	nmol per liter	PO4
TPP	Total particulate phosphorus.	nmol per liter	TPP

Database

Contribute Data

Dataset: AE1812 Water column phosphate data
Deployment: AE1812

Dataset acquisition description

Dataset Processing Description

Database

Contribute Data

Dataset: AE1812 Water column phosphate dataDeployment: AE1812

Dataset acquisition description

Dataset Processing Description

Dataset: AE1812 Water column phosphate data
Deployment: AE1812