Dataset: AR16 Water column nutrients
Deployment: AR16

AE1812 water column phosphates

Principal Investigator:

Benjamin A.S. Van Mooy (University of Rhode Island, URI-GSO)

BCO-DMO Data Manager:

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

Project:

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

Deployment Synonyms:

PHAT – Phosphorus, Hydrocarbons, and Trichodesmium

Data URL:

https://www.bco-dmo.org/dataset-deployment/762872/data

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Description

This dataset includes water column nutrient data from RV/Neil Armstrong cruise AR16, May 2017: silicate, nitrate, nitrite, and ammonium concentrations.

Methods & Sampling

Dataset acquisition description

Sampling was conducted aboard the R/V Neil Armstrong during a cruise in May 2017. Seawater was collected from Niskin bottles deployed on a rosette with a CTD. Samples were pre-filtered through a 0.2 micrometer filter into a 50 mL Falcon tube and frozen at -20 degrees C. Samples were shipped frozen to the University of Washington Marine Chemistry Laboratory. Samples were analyzed on a Technicon AAII Autoanalyzer.

Analytical methods (from https://www.ocean.washington.edu/story/Marine+Chemistry+Laboratory):

Analysis	Method Reference	EPA/SM#	MELAC Code
PO4	UNESCO(1994)	EPA 365.5_1.4_1997	WM920270
Si(OH)4	UNESCO(1994)	EPA 366	WM920240
NO3	UNESCO(1994)	EPA 353.4_2_1997	10068209
NO2	UNESCO(1994)	EPA 353.4_2_1997	10068209
NH4	UNESCO(1994)	EPA 349	WM920220

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
- added lat and lon for each cast from data provided in dataset AR16_Water_Column, id#754508

More information about this dataset deployment

Funding

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

Instruments

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.

Nutrient Autoanalyzer

Supplied Name: Technicon AAII Autoanalyzer

Supplied Description:

Instrument Type

Generic Name: Nutrient Autoanalyzer

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/LAB04/

Generic Description:

Nutrient Autoanalyzer is a generic term used when specific type, make and model were not specified. In general, a Nutrient Autoanalyzer is an automated flow-thru system for doing nutrient analysis (nitrate, ammonium, orthophosphate, and silicate) on seawater 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
PO4	Phosphate concentration.Samples were NOT pre-concentrated with MAGIC; bdl = 0.014 umol per liter	umol per liter	PO4
Silicate	Silica concentration; bdl = 0.23 umol per liter	umol per liter	Silicate
NO3	Nitrate concentration; bdl = 0.288 umol per liter	umol per liter	NO3
NO2	Nitrite concentration; bdl = 0.011 umol per liter	umol per liter	NO2
NH4	Ammonium concentration; bdl = 0.047 umol per liter	umol per liter	NH4
lat	latitude; north is positive	decimal degrees	lat
lon	longitude; east is positive	decimal degrees	lon

Database

Contribute Data

Dataset: AR16 Water column nutrients
Deployment: AR16

Dataset acquisition description

Dataset Processing Description

Database

Contribute Data

Dataset: AR16 Water column nutrientsDeployment: AR16

Dataset acquisition description

Dataset Processing Description

Dataset: AR16 Water column nutrients
Deployment: AR16