Dataset: GN01 Aerosol Nitrate

Name: Aerosol Nitrate (NO3) from samples collected on the US GEOTRACES Arctic cruise (HLY1502) from August to October 2015
Published: 2019-01-17
Keywords: oceans

Cite This Dataset

Spatial Extent: N:89.9413 E:171.6882 S:56.0743 W:-104.19

Temporal Extent: 2015-08-10 - 2015-10-09

Project:

Collaborative Research: GEOTRACES Arctic Ocean section-Constraining Nitrogen Cycling in the western Arctic Ocean. (US GEOTRACES Arctic Nitrogen Flux)

U.S. Arctic GEOTRACES Study (GN01) (U.S. GEOTRACES Arctic)

Program:

U.S. GEOTRACES (U.S. GEOTRACES)

Principal Investigator:

Meredith Hastings (Brown University)

Co-Principal Investigator:

Julie Granger (University of Connecticut, UConn)

BCO-DMO Data Manager:

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

Version:

Version Date:

2019-01-17

Restricted:

Validated:

Yes

Current State:

Final no updates expected

Aerosol Nitrate (NO3) from samples collected on the US GEOTRACES Arctic cruise (HLY1502) from August to October 2015

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Description

This dataset contains concentration and nitrogen and oxygen isotopic composition of aerosol nitrate collected during the U.S. GEOTRACES ARCTIC research cruise in 2015.

Methods & Sampling

Samples were collected using Florida State University's high volume aerosol sampler (Tisch Environmental TSP TE5170V), during the US GEOTRACES Arctic cruise, USCG Healy (HLY1502), which took place from August 9, 2015 - October 12, 2015. Samples were collected at the rate of 1 cubic meter per minute on Whatman 47 mm discs (glass fiber; GF) or quartz microfiber; QMA) and were pre-combusted before deployment.

Methods for collection of filter and extraction of nitrate are described in Morton et al. (Limnology and Oceanography: Methods; 2013). Filters were stored frozen until processing. Filters were soaked in 30 mL ultrapure (18 Megaohm) water, sonicated, and then filtered via syringe filters.

Concentration analysis of samples was completed using an automated colorimetric system (WestCo SmartChem 200); the pooled standard deviation of control standards run within each sample set run was 0.3 micromoles per Liter (6.2 ppb nitrate); detection limit was 0.09 micromoles per Liter. Based upon nitrate concentration, 20 nmol of N were injected into vials containing denitrifying bacteria to convert nitrate to nitrous oxide for isotopic analysis on a ThermoFisher Delta V isotope ratio mass spectrometer. Analysis for d15N and d18O of nitrate are described in Sigman et al. (Analytical Chemistry; 2001), Casciotti et al. (Analytical Chemistry; 2002), McIlvin and Casciotti (Analytical Chemistry; 2011). Kaiser et al. (Analytical Chemistry; 2007) describes similar methodology for the determination of D17O of nitrate. D17O analyses require 50 nmol of N for complete analysis.

Data Processing Description

NOTE: Not enough nitrate for D17O analysis for aerosol samples. No NH4 or H2O isotope analyses were conducted for these samples.

As described in Kaiser et al. (2007), isotopic data is corrected and standardized to international reference materials IAEA-N3, USGS34, and USGS35, which are run 3-9 times with each sample run. For d15N, samples are corrected for isobaric interferences and a blank associated with the bacteria. For d18O, samples are corrected for isobaric interferences, blank, and exchange between sample nitrate and background water that takes place during denitrification to nitrous oxide. The pooled standard deviation for the reference materials are (n=88): 0.2 per mil for d15N and 0.7 per mil for d18O of IAEA-N3; 0.3 per mil for d15N and 0.7 per mil for d18O of USGS34; and 0.7 per mil for d18O of USGS35 (sample d15N is not corrected for d15N of USGS35, this is used as an internal quality check and pooled standard deviation across all runs in 0.2 per mil). 10 samples were run in duplicate or triplicate and the paired pooled standard deviation (n=10) is 0.2 per mil for d15N and 0.4 per mil for d18O. Pooled standard deviation for USGS34 and USGS35 run for D17O is 0.6 and 0.9 per mil each (n=14 and 15, respectively), and replicate samples were 0.9 per mil (n=4).

Due to contamination during sample processing with syringe filters, only a subset of aerosols collected could be analyzed for isotopic characterization (n = 8 reported out of 12).

BCO-DMO Processing:
- modified parameter names (replaced spaces with underscores);
- formatted times as hh:mm;
- separated Dates_of_collection field into Date_Start and Date_End (yyyy-mm-dd).

Data Files

File
Aerosols_NO3.csv (Comma Separated Values (.csv), 2.62 KB) MD5:ee9d077009ec4eedb5c83a726538563c Primary data file for dataset ID 753147

More Information about this dataset

Funding Sources

Funding Source	Award Number
NSF Division of Ocean Sciences	OCE-1433989
NSF Division of Ocean Sciences	OCE-1435002

Deployments

Deployment	Synonyms	Start Date	Platform	Investigator
HLY1502	GN01 U.S. GEOTRACES Arctic 32H120150809	2015-08-09	USCGC Healy	David C. Kadko (Chief Scientist) William M. Landing (Co-Chief Scientist)	data info

Instruments

Aerosol Sampler

Supplied Name: Tisch TE-5170V-BL high volume aerosol sampler

Supplied Description:

Instrument Type

Generic Name: Aerosol Sampler

Acronym: Aerosol_Sampler

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/13/

Generic Description:

A device that collects a sample of aerosol (dry particles or liquid droplets) from the atmosphere.

Discrete Analyzer

Supplied Name: WestCo SmartChem 200 discrete chemistry analyzer

Supplied Description:

Instrument Type

Generic Name: Discrete Analyzer

Generic Description:

Discrete analyzers utilize discrete reaction wells to mix and develop the colorimetric reaction, allowing for a wide variety of assays to be performed from one sample. These instruments are ideal for drinking water, wastewater, soil testing, environmental and university or research applications where multiple assays and high throughput are required.

Isotope-ratio Mass Spectrometer

Supplied Name: ThermoFisher Delta V isotope ratio mass spectrometer

Supplied Description:

Instrument Type

Generic Name: Isotope-ratio Mass Spectrometer

Acronym: IR Mass Spec; IRMS

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

Generic Description:

The Isotope-ratio Mass Spectrometer is a particular type of mass spectrometer used to measure the relative abundance of isotopes in a given sample (e.g. VG Prism II Isotope Ratio Mass-Spectrometer).

Parameters

Date and time formats are described in python strftime() syntax.

Supplied Name	Supplied description	Supplied Units	Standard Name
deployment_number	Deployment set number (designated by FSU filter collection team)	unitless	deployno
filter_type	Filter type (GFF = glass fiber; QMA = quartz microfiber)	unitless	instrument
GEOTRC_EVENTNO	Cruise event number	unitless	event
GEOTRC_SAMPNO	Log number for sample set (GEOTRACES sample number)	unitless	sample
Dates_of_collection	Cruise collection dates in 2015. Format: m/dd - m/dd	unitless	date
Date_Start	Date at start of collection period. Format: yyyy-mm-dd	unitless	date_begin
Date_End	Date at end of collection period. Format: yyyy-mm-dd	unitless	date_end
UTC_Start	Start time (UTC). Format: hh:mm	unitless	time_begin
Latitude_Start	Latitude at start of air collection through filter; positive is North	decimal degrees	lat
Longitude_Start	Longitude at start of air collection through filter; negative is West	decimal degrees	lon
UTC_End	End time (UTC). Format: hh:mm	unitless	time_end
Latitude_End	Latitude at end of air collection through filter; positive is North	decimal degrees	lat
Longitude_End	Longitude at end of air collection through filter; negative is West	decimal degrees	lon
Collection_Time	Total time of air collection through filter, in hours	hours	time_elapsed
Total_air_filtered	Total volume of air filtered through each filter	cubic meters of air	volume
Extraction_Volume	Volume of ultra pure water used to extract filter nitrate	millilters (mL)	no_bcodmo_term
NITRATE_A_SML_CONC_HIVOL	Concentration of aerosol nitrate after accounting for volume air filtered, in micromoles per liter of air; this conversion allowed for comparable units with non-aerosol data in micromoles per liter of water	micromoles per liter of air (umol/L)	NO3_aerosol
NITRATE_15_14_A_SML_DELTA_HIVOL	delta 15N of aerosol nitrate	permil vs. atmospheric N2	dN15_NO3
NITRATE_18_16_A_SML_DELTA_HIVOL	delta 18O of aerosol nitrate	permil vs. VSMOW	d18O_NO3
Comments	Comments regarding aerosol collection	unitless	comment

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Dataset: GN01 Aerosol Nitrate