Dataset: Suspended particles underway
Deployment: KM1910

Surface particulate carbon concentration, nitrogen concentration, and bulk isotope composition (C and N) from underway clean water intake during June 2019 at station ALOHA during cruise KM1910.

Methods & Sampling

Dataset acquisition description

Sampling and analytical procedures:

Suspended particulates were collected while underway using the ship's clean surface water intake ( ~0 to 5 m ocean depth) in the hydro lab sink aboard RV Kilo Moana. Water was passed through three separate filter holders containing 1) an acid-washed 53um mesh screen pre-filter followed by 2), a combusted (4.5hrs 450 degrees C) 142mm GF/F (Whatman nominal pore size 0.7um) and finally followed by 3), a combusted 142mm GF75 (Advantec nominal pore size 0.3um). Samples were folded (active side in) and stored in clean (combusted) foil at -20 degrees C until subsampled with metal cork borer (subsamples were not acidified so PC and d13C represents total C). Subsamples were oven-dried overnight at 55-60 degrees C then packed in 9x11 tin capsules for analysis on EA IRMS. Six blank (dry) filters were analyzed for background C and N and subtracted from measured PC and PN sample values.

Instruments:

EA-IRMS: a Vario ISOTOPE select (Elementar Isoprime) was used to quantify total C, N, and d13C and d15N. Samples are combusted/reduced at high temperature to create gases (CO2 and N2); column chromatography separates the gases; a thermal conductivity detector determines the carbon and nitrogen concentrations, followed by an isotope ratio mass spectrometer for bulk isotope composition. Measurements were calibrated with an in-house aminocaproic acid standard (ACROS) and four USGS standards (#41, #41a, #65, #25). Analytical uncertainty (determined from standards with similar isotope values) was 0.2‰ for delta-15N and 0.1‰ for delta-13C.

Known problems:

Lat and Lon was not recorded at end of sample starting at 11:51 and ending at 15:30 on 190617

Data Processing Description

Dataset Processing Description

BCO-DMO Processing:
- converted date_HST to YYYY-MM-DD format;
- created UTC date/time field in ISO8601 format.

More information about this dataset deployment

Funding

Award Number	Funding Source
OCE-1911831	NSF Division of Ocean Sciences
OCE-1911990	NSF Division of Ocean Sciences

Instruments

Elemental Analyzer

Supplied Name: EA-IRMS

Supplied Description:

A Vario ISOTOPE select (Elementar Isoprime) was used to quantify total C, N, and d13C and d15N.

Instrument Type

Generic Name: Elemental Analyzer

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/LAB01/

Generic Description:

Instruments that quantify carbon, nitrogen and sometimes other elements by combusting the sample at very high temperature and assaying the resulting gaseous oxides. Usually used for samples including organic material.

Isotope-ratio Mass Spectrometer

Supplied Name:

Supplied Description:

Bulk isotope composition.

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

Supplied Name	Supplied description	Supplied Units	Standard Name
cruise_id	Cruise identifier	unitless	cruise_id
Start_ISO_DateTime_UTC	Datetime (UTC) at start of collection; in ISO8601 format: YYYY-MM-DDThh:mmZ	unitless	ISO_DateTime_UTC
date_start_HST	Local date (HST) at start of collection; format: YYYY-MM-DD	unitless	start_date
time_start_HST	Local time (HST) (24 hour) at start of collection; format: hhmm	unitless	time
End_ISO_DateTime_UTC	Datetime (UTC) at end of collection; in ISO8601 format: YYYY-MM-DDThh:mmZ	unitless	ISO_DateTime_UTC
date_end_HST	Local date (HST) at end of collection; format: YYYY-MM-DD	unitless	end_date
time_end_HST	Local time (HST) (24 hour) at end of collection; format: hhmm	unitless	time
sta	Station number	unitless	station
lon_start	Longitude (degrees E) at start of collection	decimal degrees	lon_start
lat_start	Latitude (degrees N) at start of collection	decimal degrees	lat_start
lon_end	Longitude (degrees E) at end of collection	decimal degrees	lon_end
lat_end	Latitude (degrees N) at end of collection	decimal degrees	lat_end
samplesize_L	Liters of water through entire filter	liters (L)	sample_volume
subsamplesize_L	Liters of water through filter punch subsample	liters (L)	sample_volume
PC_GFF	Total Particulate Carbon (PC) [umol/L] on first filter GF/F (nominal pore size 0.7um), prefiltered with 53um mesh, size range = 53 to 0.7um; filter punches not acidified before analysis; measurements corrected for 6 blank (dry) filters	micromole per liter (umol/L)	TPC
PC_GF75	Particulate Carbon (PC) [umol/L] on second filter GF75 (nominal pore size 0.3um), size range = 0.7 to 0.3um, filter punches not acidified before analysis; measurements corrected for 6 blank (dry) filters	micromole per liter (umol/L)	C
P13C_GFF	Delta-13C of PC (permil vs. VPDB) on first filter GF/F (nominal pore size 0.7um), prefiltered with 53um mesh, size range = 53 to 0.7um; filter punches not acidified before analysis. Analytical uncertainty 0.1 permil	permil vs. VPDB	d13C
P13C_GF75	Delta-13C of PC (permil vs. VPDB) on second filter GF75 (nominal pore size 0.3um) size range = 0.7 to 0.3um, filter punches not acidified before analysis. Analytical uncertainty 0.1 permil	permil vs. VPDB	d13C
PN_GFF	Particulate Nitrogen (PN) [umol/L] on first filter GF/F (nominal pore size 0.7um), prefiltered with 53um mesh, size range = 53 to 0.7um; filter punches not acidified before analysis; measurements corrected for 6 blank (dry) filters	micromole per liter (umol/L)	PON
PN_GF75	Particulate Nitrogen (PN) [umol/L] on second filter GF75 (nominal pore size 0.3um), size range = 0.7 to 0.3um, filter punches not acidified before analysis; measurements corrected for 6 blank (dry) filters	micromole per liter (umol/L)	PON
P15N_GFF	Delta-15N of PN (permil vs. air-N2) on first filter GF/F (nominal pore size 0.7um), prefiltered with 53um mesh, size range = 53 to 0.7um; filter punches not acidified before analysis. Note there is no P15N_GF75 data, all samples from the second filter were below detection, detection limit ~0.75 micromol N. Analytical uncertainty 0.2 permil	permil vs. air-N2	d15N

Database

Contribute Data

Dataset: Suspended particles underway
Deployment: KM1910

Dataset acquisition description

Dataset Processing Description

Database

Contribute Data

Dataset: Suspended particles underwayDeployment: KM1910

Dataset acquisition description

Dataset Processing Description

Dataset: Suspended particles underway
Deployment: KM1910