Dataset: NH4 - Upper water column Ammonium measurements
Deployment: AT21-04

Upper water column Ammonium measurements

Principal Investigator:

Douglas G. Capone (University of Southern California, USC-WIES)

Co-Principal Investigator:

William M. Berelson (University of Southern California, USC-WIES)

Contact:

Matt Tiahlo (University of Southern California, USC-WIES)

BCO-DMO Data Manager:

Stephen R. Gegg (Woods Hole Oceanographic Institution, WHOI BCO-DMO)

Project:

Amazon iNfluence on the Atlantic: CarbOn export from Nitrogen fixation by DiAtom Symbioses (ANACONDAS)

Current State:

Preliminary and in progress

Version:

28 March 2013

Deployment Synonyms:

AN12, ANACONDAS, ROCA

Version Date:

2013-03-28

Data URL:

https://osprey.bco-dmo.org/dataset-deployment/491149/data

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Description

Ammonium concentrations were derived using the fluorometric method described by Holmes et al., (1999) incorporating amendments suggested by Taylor et al., (2007)

Related files and references:
Holmes et al. (1999). Description of fluorometric analytical technique.
A simple and precise method for measuring ammonium in marine and freshwater ecosystems
Robert M Holmes, Alain Aminot, Roger Kérouel, Bethanie A Hooker, Bruce J Peterson
Canadian Journal of Fisheries and Aquatic Sciences, 1999, 56(10): 1801-1808, 10.1139/f99-128
http://www.nrcresearchpress.com/doi/abs/10.1139/f99-128#.UugDShDTncs

Taylor et al. (2007). Description of improvements to Holmes method
Improving the fluorometric ammonium method: matrix effects, background fluorescence, and standard additions
Brad W. Taylor, Christine F. Keep, Robert O. Hall, Benjamin J. Koch, Lusha M. Tronstad, Alexander S. Flecker, Amber J. Ulseth
Journal of The North American Benthological Society - J N AMER BENTHOL SOC 01/2007; 26(2):167-177.
doi: http://dx.doi.org/10.1899/0887-3593(2007)26[167:ITFAMM]2.0.CO;2
http://www.bioone.org/doi/abs/10.1899/0887-3593%282007%2926%5B167%3AITFAMM%5D2.0.CO%3B2

Methods & Sampling

Dataset acquisition description

Sampling and Analytical Methodology:
50ml per sample drawn in duplicate from CTD mounted Niskin bottles. Samples for background fluorescence and matrix effect corrections per proceedures described in Taylor et al. (2007). Duplicate samples analysed for all depths. Typically 6 depths per cast were sampled, in the range of 0-100m. Standard deviation values included with dataset.

Samples were analysed underway using a Turner Trilogy fluorometer (model #7200-000) with Turner UV fluorescence module (7200-041). Limit of detection was typically ~0.01uM NH4.

Data Processing Description

Dataset Processing Description

Data Processing:
Values below detection limit reported as 0.

Equations used to derive concentrations as explained in Taylor et al (2007)

Initial quality control measures include omission of suspect or outlier standard values and blanks, and suspected contaminated samples. May be subject to further minor corrections. Current version release date: 28 March 2013.

BCO-DMO Processing Notes
- Generated from original file: "ANACONDAS NH4 all cruises 20130328.xlsx" contributed by Matt Tiahlo
- Cruise "Id_Year" added to data (i.e. "AN10_2010")
- Event Date/Time GMT added from event logs
- Event Lat/lon added from event logs
- Parameters modified to conform to BCO-DMO parameter naming conventions
- "nd" (no data) inserted into blank cells
- ANACONDAS numbers for AN11_2011, event 6.12 corrected by Matt Tiahlo 11Feb2014/srg

More information about this dataset deployment

Funding

Award Number	Funding Source
OCE-0934073	NSF Division of Ocean Sciences

Instruments

CTD Sea-Bird SBE 911plus

Supplied Name: CTD SBE 911plus

Supplied Description:

Instrument Type

Generic Name: CTD Sea-Bird SBE 911plus

Acronym: CTD SBE 911plus

Community Identifier: http://vocab.nerc.ac.uk/collection/L22/current/TOOL0058/

Generic Description:

The Sea-Bird SBE 911 plus is a type of CTD instrument package for continuous measurement of conductivity, temperature and pressure. The SBE 911 plus includes the SBE 9plus Underwater Unit and the SBE 11plus Deck Unit (for real-time readout using conductive wire) for deployment from a vessel. The combination of the SBE 9 plus and SBE 11 plus is called a SBE 911 plus. The SBE 9 plus uses Sea-Bird's standard modular temperature and conductivity sensors (SBE 3 plus and SBE 4). The SBE 9 plus CTD can be configured with up to eight auxiliary sensors to measure other parameters including dissolved oxygen, pH, turbidity, fluorescence, light (PAR), light transmission, etc.). more information from Sea-Bird Electronics

Fluorometer

Supplied Name: Turner Trilogy fluorometer (model #7200-000)

Supplied Description:

Samples were analysed underway using a Turner Trilogy fluorometer (model #7200-000) with Turner UV fluorescence module (7200-041). Limit of detection was typically ~0.01uM NH4.

Instrument Type

Generic Name: Fluorometer

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/113/

Generic Description:

A fluorometer or fluorimeter is a device used to measure parameters of fluorescence: its intensity and wavelength distribution of emission spectrum after excitation by a certain spectrum of light. The instrument is designed to measure the amount of stimulated electromagnetic radiation produced by pulses of electromagnetic radiation emitted into a water sample or in situ.

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
Id_Year	ANACONDAS Cruise Id and Year of Cruise (ANYY_YYYY)	text	cruise_id
AN_Number	ANACONDAS Sample Id (Sample Id = CruiseIdxxxxx)	text	sample
Station	ANACONDAS Station Id	text	station
Event_Number	ANACONDAS Event Id (Event Id = Station Id.Event Id at station)	text	event
Date_GMT	Event Date (GMT)	YYYYMMDD	date
Time_GMT	Event Time (GMT)	HHMM	time
Latitude	Event Latitude (South is negative)	decimal degrees	lat
Longitude	Event Longitude (West is negative)	decimal degrees	lon
Cast	Sequential CTD Cast Number	dimensionless	cast
Niskin	Niskin Bottle Number	dimensionless	bottle
Depth	Nominal Sample Depth	meters	depth
NH4_A	Ammonium concentration of sample replicate A	umol/L	NH4
NH4_B	Ammonium concentration of sample replicate B	umol/L	NH4
mean	Mean of replicates A and B	umol/L	mean
sd	standard deviation of mean values	umol/L	std_error_mean

Database

Contribute Data

Dataset: NH4 - Upper water column Ammonium measurements
Deployment: AT21-04

Dataset acquisition description

Dataset Processing Description

Database

Contribute Data

Dataset: NH4 - Upper water column Ammonium measurementsDeployment: AT21-04

Dataset acquisition description

Dataset Processing Description

Dataset: NH4 - Upper water column Ammonium measurements
Deployment: AT21-04