Dataset: ammonium
Deployment: TN277

Ammonium (NH4) data from CTD rosette bottles from 3 POWOW cruises.

Principal Investigator:

Zackary I. Johnson (Duke University)

BCO-DMO Data Manager:

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

Project:

Seasonal and decadal changes in temperature drive Prochlorococcus ecotype distribution patterns (POWOW)

Current State:

Final no updates expected

Version:

25 Oct 2012

Deployment Synonyms:

POWOW1

Version Date:

2012-10-25

Data URL:

https://www.bco-dmo.org/dataset-deployment/455489/data

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Description

Ammonium (NH4) concentration in nM from 3 POWOW cruises (TN277, KM1301, and KM1312). Samples that had a mean concentration (mean of replicated samples) below the nominal detection limit are reported as zero.

Also see related inorganic nutrient data from this project.
Nitrite and Nitrate (NO2, NO3) https://www.bco-dmo.org/dataset/3755
Phosphate and Silicate (PO4, SiOH4) https://www.bco-dmo.org/dataset/3756

Methods & Sampling

Dataset acquisition description

Ammonium was measured on fresh, unfiltered samples following Holmes et al. 1999. Certified reference materials were used to verify protocols (Inorganic Ventures: QCP-NT, QCP-NUT-1, CGSI1-1). The detection limits of NH4 were:
9 nM for POWOW1 samples
5 nM for POWOW2 and POWOW3 samples

Data Processing Description

Dataset Processing Description

BCO-DMO edits made:
- Parameter names have been changed to conform to BCO-DMO conventions.
- month_utc, day_utc, year, and time_utc were added, based on the original ISO_DateTime_UTC field.
- Rosette bottle numbers were added from the CTD cast sheets for POWOW1 data.
- 'NaN' was replaced with 'nd' to indicate 'no data'.

More information about this dataset deployment

Funding

Award Number	Funding Source
OCE-1031064	NSF Division of Ocean Sciences

Instruments

Niskin bottle

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.

Parameters

Supplied Name	Supplied description	Supplied Units	Standard Name
cruise_name	Cruise identifier (POWOW1 = TN277 = R/V Thomas G. Thompson cruise 277; POWOW2 = KM1301 = R/V Kilo Moana cruise 1301; POWOW3 = KM1312 = R/V Kilo Moana cruise 1312).	text	cruise_name
cast	Consecutive CTD cast number. CTD numbers are unique and sequential across stations.	unitless	cast
lat	Latitude at start of CTD cast. Positive = North.	decimal degrees	lat
lon	Longitude at start of CTD cast. Positive = East.	decimal degrees	lon
depth_w	Depth of the water (bottom depth) at sampling station.	meters	depth_w
month_utc	2-digit month of year, UTC.	mm (01 to 12)	month_utc
day_utc	2-digit day of month, UTC.	dd (01 to 31)	day_utc
year	4-digit year. in YYYY format	unitless	year
time_utc	Time (UTC) at start of sample collection, 24-hour clock.	HHMM.mm	time_utc
ISO_DateTime_UTC	Date/Time (UTC) ISO8601 formatted. T indicates start of time string; Z indicates UTC.	YYYY-mm-ddTHH:MM:SS.ssZ	ISO_DateTime_UTC
depth	Sample depth.	meters	depth
bot	Rosette position of the bottle.	unitless	bot
NH4	Ammonium (NH4) concentration in nM.	nanomolar (nM)	NH4

Database

Contribute Data

Dataset: ammonium
Deployment: TN277

Dataset acquisition description

Dataset Processing Description

Database

Contribute Data

Dataset: ammoniumDeployment: TN277

Dataset acquisition description

Dataset Processing Description

Dataset: ammonium
Deployment: TN277