Dataset: ETSP NO2 NH4
Deployment: MV1104

ETSP nitrite (NO2) and ammonium (NH4) concentration data

View Data: For data, See Dataset Metadata Page: https://www.bco-dmo.org/dataset/820165

Lead Principal Investigator:

Karen L. Casciotti (Woods Hole Oceanographic Institution, WHOI)

Scientist:

Angela N. Knapp (Florida State University, FSU - EOAS)

Contact:

Alyson E. Santoro (University of California-Santa Barbara, UCSB)

BCO-DMO Data Manager:

Dana Stuart Gerlach (Woods Hole Oceanographic Institution, WHOI BCO-DMO)

Project:

Expression of Microbial Nitrification in the Stable Isotopic Systematics of Oceanic Nitrite and Nitrate (Microbial Nitrification)

Version:

Deployment Synonyms:

ETSP2011

Expand/Collapse All

Description

Methods & Sampling

Dataset acquisition description

Seawater samples were obtained during the R/V Atlantis (AT15-61) and R/V Melville (MV1104) cruises in Jan-Feb 2010 and Mar-Apr 2011. Water samples were collected at discrete depths using a standard 24-bottle Niskin rosette sampler equipped with an SBE9plus conductivity-temperature-depth (CTD) sensor package (SeaBird Electronics, Bellevue, WA).

Ammonium concentration ([NH4+]) was determined on-ship in unfiltered 50 mL seawater samples using o-phthaldialdehyde derivatization (Holmes et al., 1999) and measurement on an Aquafluor 8000 handheld fluorometer (Turner Designs), with modifications as suggested in Taylor et al., 2007. Nitrite ([NO2-]) was determined on-ship in unfiltered 50 mL sample volumes using standard colorimetric methods (Strickland and Parsons, 1968). NH4+ standards (30 – 300 nM) were freshly prepared for each analysis in duplicate using deep water (> 500 m) from the same station, which consistently had a lower blank than ultrapure water. Detection limits for [NH4+] and [NO2-] were 0.010 µM, and 0.10 µM for [NO2-]. Measured values are reported even if they are lower than the detection limit.

Data Processing Description

Dataset Processing Description

Full protocol on seawater [NH4+] processing can be found below under Supplemental Files: "Ammonium Concentration in Seawater Protocol Santoro Lab v2.3"

BCO-DMO processing:
- Adjusted parameter names to comply with database requirements.
- Combined year, month, day fields into one date field.
- Units in parentheses removed and added to Parameter Description metadata section.
- Added a conventional header with dataset name, PI name, version date.
- Missing data identifier of 'NaN' replaced with 'nd' ('nd' is BCO-DMO system default missing data identifier).

More information about this dataset deployment

Funding

Award Number	Funding Source
OCE-0961098	NSF Division of Ocean Sciences

Instruments

CTD Sea-Bird 9

Supplied Name: SBE9plus conductivity-temperature-depth (CTD) sensor package

Supplied Description:

SeaBird 9plus conductivity-temperature-depth (CTD) sensor package (SeaBird Electronics, Bellevue, WA).

Instrument Type

Generic Name: CTD Sea-Bird 9

Acronym: CTD SBE 9

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

Generic Description:

The Sea-Bird SBE 9 is a type of CTD instrument package. The SBE 9 is the Underwater Unit and is most often combined with the SBE 11 Deck Unit (for real-time readout using conductive wire) when deployed from a research vessel. The combination of the SBE 9 and SBE 11 is called a SBE 911. The SBE 9 uses Sea-Bird's standard modular temperature and conductivity sensors (SBE 3 and SBE 4). The SBE 9 CTD can be configured with auxiliary sensors to measure other parameters including dissolved oxygen, pH, turbidity, fluorometer, altimeter, etc.). Note that in most cases, it is more accurate to specify SBE 911 than SBE 9 since it is likely a SBE 11 deck unit was used. more information from Sea-Bird Electronics

Niskin bottle

Supplied Name: standard 24-bottle Niskin rosette sampler

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.

Turner Designs Aquafluor 8000

Supplied Name: Turner Designs Aquafluor 8000 handheld fluorometer/turbidometer

Supplied Description:

AquaFluor® is a lightweight, inexpensive, handheld fluorometer/turbidimeter ideal for field use. Can be configured with one or two channels to measure turbidity, chlorophyll, algae, dyes, ammonium, CDOM, and more. Detailed description at https://www.turnerdesigns.com/aquafluor-handheld-fluorometer

Instrument Type

Generic Name: Turner Designs Aquafluor 8000

Generic Description:

The Turner Designs Aquafluor 8000 is a lightweight, handheld fluorometer/turbidimeter ideal for field use. It can be configured with one or two channels to measure turbidity, chlorophyll, algae, dyes, ammonium, CDOM, and more. Detailed description at https://www.turnerdesigns.com/aquafluor-handheld-fluorometer

Parameters

Supplied Name	Supplied description	Supplied Units	Standard Name
Depth	Sample depth	meters	depth
Year	Deployment year	unitless	year
Month	Deployment month (local)	unitless	month_local
Day	Deployment day (local)	unitless	day_local
Latitude	Latitude of sample collection, South is negative	decimal degrees	lat
Longitude	Longitude of sample collection, West is negative	decimal degrees	lon
Station	Station Number	unitless	station
Cast	Cast Number	unitless	cast
NO2	Nitrite concentration	micromole per liter (umol/L)	NO2
NH4	Ammonium concentration	micromole per liter (umol/L)	NH4
ISO_Date_Local	Date of sampling in ISO format (yyyy-mm-dd). Timezone was GMT-5 in 2010, GMT-4 in 2011	yyyy-mm-dd	date_local

Database

Contribute Data

Dataset: ETSP NO2 NH4
Deployment: MV1104

Dataset acquisition description

Dataset Processing Description

Database

Contribute Data

Dataset: ETSP NO2 NH4Deployment: MV1104

Dataset acquisition description

Dataset Processing Description

Dataset: ETSP NO2 NH4
Deployment: MV1104