Dataset: Arctic Nitrogen Fixation Rates
Deployment: ArcticNitro_Barrow

Size fractioned nitrogen fixation rates

Principal Investigator:

Rachel E. Sipler (Virginia Institute of Marine Science, VIMS)

Co-Principal Investigator:

Deborah A. Bronk (Virginia Institute of Marine Science, VIMS)

Patricia L. Yager (University of Georgia, UGA)

Contact:

Rachel E. Sipler (Virginia Institute of Marine Science, VIMS)

BCO-DMO Data Manager:

Amber D. York (Woods Hole Oceanographic Institution, WHOI BCO-DMO)

Project:

Does competition for nitrogen between autotrophs and heterotrophs control carbon fluxes in the western coastal Arctic? (ArcticNITRO)

Data URL:

https://www.bco-dmo.org/dataset-deployment/701801/data

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Description

This dataset contains nitrogen fixation rates, as well as ammonium, nitrate, and phosphate concentrations collected in the coastal Chukchi Sea west of Barrow, Alaska between 15 Aug 2011 and 20 Aug 2011. Salinity, temperature, and collection depth are also provided.

Methods & Sampling

Dataset acquisition description

Nitrogen fixation rates were calculated according to Montoya et al. (1996) and are reported as the average +- the standard error for each site (n=3). Sampling methodology and other analytical procedures are described in detail in Baer et al (2017).

Data Processing Description

Dataset Processing Description

BCO-DMO Data Manager Processing Notes:
* added a conventional header with dataset name, PI name, version date
* modified parameter names to conform with BCO-DMO naming conventions
* data with value "surface" in collection depth column changed to 0
* Added ISO_DateTime_UTC from UTC_Time and date_local fields
* latitude and longitude converted to decimal degrees from degrees minutes seconds.

More information about this dataset deployment

Funding

Award Number	Funding Source
PLR-0909839	NSF Arctic Sciences

Instruments

Flow Injection Analyzer

Supplied Name: Lachat QuickChem 8500 autoanalyzer

Supplied Description:

Nitrate and phosphate were measured using a Lachat QuikChem 8500 autoanalyzer.

Instrument Type

Generic Name: Flow Injection Analyzer

Acronym: FIA

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/LAB36/

Generic Description:

An instrument that performs flow injection analysis. Flow injection analysis (FIA) is an approach to chemical analysis that is accomplished by injecting a plug of sample into a flowing carrier stream. FIA is an automated method in which a sample is injected into a continuous flow of a carrier solution that mixes with other continuously flowing solutions before reaching a detector. Precision is dramatically increased when FIA is used instead of manual injections and as a result very specific FIA systems have been developed for a wide array of analytical techniques.

Mass Spectrometer

Supplied Name: Europa GEO 20/20

Supplied Description:

Isotopic measurements for 15N fixation rates were analyzed on a Europa GEO 20/20 mass spectrometer with an ANCA-SL autosampler.

Instrument Type

Generic Name: Mass Spectrometer

Acronym: Mass Spec

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/LAB16/

Generic Description:

General term for instruments used to measure the mass-to-charge ratio of ions; generally used to find the composition of a sample by generating a mass spectrum representing the masses of sample components.

UV Spectrophotometer-Shimadzu

Supplied Name: Shimadzu UV-1601 spectrophotometer

Supplied Description:

Ammonium concentrations were measured on a Shimadzu UV-1601 spectrophotometer.

Instrument Type

Generic Name: UV Spectrophotometer-Shimadzu

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/LAB20/

Generic Description:

The Shimadzu UV Spectrophotometer is manufactured by Shimadzu Scientific Instruments (ssi.shimadzu.com). Shimadzu manufacturers several models of spectrophotometer; refer to dataset for make/model information.

Parameters

Supplied Name	Supplied description	Supplied Units	Standard Name
Sample_ID	Station number (name)	unitless	sample
Date_local	Date of sample collection (time zone AKDT, UTC-8)	unitless	date
Time_local	Time of sample collection (time zone AKDT, UTC-8)	unitless	time
ISO_DateTime_UTC	Date and time of sample collection (UTC) in ISO 8601:2004(E) format YYYY-MM-DDThh:mmZ	unitless	ISO_DateTime_UTC
Latitude	Latitude of sample collection	decimal degrees	lat
Longitude	Longitude of sample collection; West is negative	decimal degrees	lon
Depth	Water Column Depth (Bottom depth)	meters (m)	depth_w
Collection_Depth	Depth of sample collection	meters (m)	depth
Size_fraction	Size Fraction	micrometer (um)	sample_descrip
Temperature	Temperature	degrees Celsius	temperature
Salinity	Salinity	Practical Salinity Units (PSU)	sal
N_Fixation_Rate_Absolute	Absolute Nitrogen fixation rate	micromoles per liter per hour (umol/L/h)	N2_fix
Nitrogen_Fixation_Rate_SE	Nitrogen fixation rate standard error	micromoles per liter per hour (umol/L/h)	N2_fix
Ammonium	Ammonium concentration [NH4]	micromolar (umol/L)	NH4
Ammonium_SD	Ammonium concentration [NH4] standard deviation	micromolar (umol/L)	NH4
Nitrate	Nitrate concentration [NO3]	micromolar (umol/L)	NO3
Nitrate_SD	Nitrate concentration [NO3] standard deviation	micromolar (umol/L)	NO2
Phosphate	Phosphate concentration [PO4]	micromolar (umol/L)	PO4
Phosphate_SD	Phosphate concentration [PO4] standard deviation	micromolar (umol/L)	PO4

Database

Contribute Data

Dataset: Arctic Nitrogen Fixation Rates
Deployment: ArcticNitro_Barrow

Dataset acquisition description

Dataset Processing Description

Database

Contribute Data

Dataset: Arctic Nitrogen Fixation RatesDeployment: ArcticNitro_Barrow

Dataset acquisition description

Dataset Processing Description

Dataset: Arctic Nitrogen Fixation Rates
Deployment: ArcticNitro_Barrow