Dataset: inorganic nutrients
Deployment: PICO_1-301

Inorganic nutrients (NO3, NO2, PO4, SiOH4) from the PICO time-series station.

Principal Investigator:

Zackary I. Johnson (Duke University)

Co-Principal Investigator:

Dana Hunt (Duke University)

Contact:

Zackary I. Johnson (Duke University)

BCO-DMO Data Manager:

Shannon Rauch (Woods Hole Oceanographic Institution, WHOI BCO-DMO)

Project:

Pivers Island Coastal Observatory (PICO)

Current State:

Final with updates expected

Version:

03 Sept 2013

Deployment Synonyms:

PICO

Version Date:

2013-09-03

Data URL:

https://www.bco-dmo.org/dataset-deployment/456099/data

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Description

Inorganic nutrients from the Pivers Island Coastal Observatory (PICO) from 2010 to 2012. Data include nitrate (NO3), nitrite (NO2), phosphate (PO4), and silicate (SiOH4) reported in micromolar units (uM).

Note: Nutrients were not all measured at all time points, thus, some dates have no data ('nd') in the 'NO3', 'NO2', 'PO4', and/or 'SiOH4' columns.

Methods & Sampling

Dataset acquisition description

Water was filtered through a 0.22 um Sterivex cartridge filter, Millipore #SVGPL10RC using a peristaltic pump input line at 1 m for later nutrient analysis (NO3, NO2, PO4, SiOH4). Water was sampled in duplicate into HCl-cleaned HDPE bottles (VWR#414004-110) and stored at -80 degrees C until later analysis using an Astoria-Pacific A2 autoanalyzer, following the manufacturer’s recommended protocols by running each replicate sample in duplicate.

Certified reference materials were used to verify protocols (Inorganic Ventures: QCP-NT, QCP-NUT-1, CGSI1-1). The detection limits were: NO2 = 0.05 uM, NO3 = 0.1 uM, PO4 = 0.05 uM, SiOH4 = 0.2 uM. Values measured below these limits are reported as zero.

Data Processing Description

Dataset Processing Description

Samples that had a mean concentration (mean of replicated samples) below the nominal detection limit are reported as zero.

Quality Scores (qflag) as follows:
1 = excellent (no known issues),
2 = suspect,
3 = poor (known reason to suspect data).

BCO-DMO Processing Notes:
- Created 'replicate' column and re-arranged data so that replicates are in rows, not columns.
- Modified parameter names to conform with BCO-DMO naming conventions.
- Replaced blanks with 'nd' to indicate 'no data'.
- Separated date into month, day, and year columns.

More information about this dataset deployment

Funding

Award Number	Funding Source
OCE-1031064	NSF Division of Ocean Sciences
OCE-RIG-1322950	NSF Ocean Sciences Research Initiation Grants

Instruments

Nutrient Autoanalyzer

Supplied Description:

Nutrient concentrations were determined using an Astoria-Pacific A2 Autoanalyzer.

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
deployment	Deployment name/id number.	text	deployno
lat	Latitude of sampling location. Positive = North.	decimal degrees	lat
lon	Longitude of sampling location. Positive = East.	decimal degrees	lon
year	Year (local time) of the sampling event.	YYYY	year
month_local	Month (local time) when the sampling event occurred.	mm (01 to 12)	month_local
PID_num	Unique, sequential "occupation" number for sampling. (The unique time/day when sampling occurred.)	dimensionless	no_bcodmo_term
day_local	Day of month (local time) when the sampling event occurred.	dd (01 to 31)	day_local
time_local	Time (local) when the sampling event occurred; 24-hour clock.	HHMM.mm	time_local
time_qflag	Quality score for time_local: 1 = excellent (no known issues); 2 = suspect; 3 = poor (known reason to suspect data).	dimensionless	q_flag
depth	Depth of water sampling.	meters	depth
replicate	Replicate identifier. (All of the "A" nutrient samples are from the same bottle, however "A" replicates for nutrients are unrelated to "A" replicates in the other PICO datasets.)	text	replicate
NO2	Nitrite concentration.	micromolar (uM)	NO2
NO2_qflag	Quality score for NO2: 1 = excellent (no known issues); 2 = suspect; 3 = poor (known reason to suspect data).	dimensionless	qflag
NO3	Nitrate concentration.	micromolar (uM)	NO3
NO3_qflag	Quality score for NO3: 1 = excellent (no known issues); 2 = suspect; 3 = poor (known reason to suspect data).	dimensionless	qflag
PO4	Phosphate concentration.	micromolar (uM)	PO4
PO4_qflag	Quality score for PO4: 1 = excellent (no known issues); 2 = suspect; 3 = poor (known reason to suspect data).	dimensionless	qflag
SiOH4	Silicate concentration.	micromolar (uM)	Silicate
SiOH4_qflag	Quality score for SiOH4: 1 = excellent (no known issues); 2 = suspect; 3 = poor (known reason to suspect data).	dimensionless	qflag
yrday	Consecutive day of year for a specified year, as a decimal. The fraction of the value represents the time within the day (e.g. a value of 1.5 means January 1 at 1200 hours).	dimensionless	yrday
ISO_DateTime_Local	Date-time (local) formatted to ISO 8601 standard.	YYYY-MM-DDTHH:MM:SS.ss	ISO_DateTime_Local

Database

Contribute Data

Dataset: inorganic nutrients
Deployment: PICO_1-301

Dataset acquisition description

Dataset Processing Description

Database

Contribute Data

Dataset: inorganic nutrientsDeployment: PICO_1-301

Dataset acquisition description

Dataset Processing Description

Dataset: inorganic nutrients
Deployment: PICO_1-301