Dataset: Compilation of MULVFS size-fractionated POC, PIC, and bSi data

Name: Compilation of MULVFS size-fractionated POC, PIC, and bSi data from 17 cruises conducted between 1973 and 2005
Published: 2022-11-21
Keywords: oceans

Cite This Dataset

DOI:10.26008/1912/bco-dmo.884057.1

Spatial Extent: N:50 E:161.01 S:-66.4 W:-172

Temporal Extent: 1973-12 - 2005-08

Project:

U.S. JGOFS Equatorial Pacific (EqPac)

VERtical Transport In the Global Ocean (VERTIGO)

Program:

Ocean Carbon and Biogeochemistry (OCB)

U.S. Joint Global Ocean Flux Study (U.S. JGOFS)

Principal Investigator:

James K.B. Bishop (University of California-Berkeley, UC Berkeley)

Co-Principal Investigator:

Phoebe J. Lam (University of California-Santa Cruz, UCSC)

Contact:

Phoebe J. Lam (University of California-Santa Cruz, UCSC)

BCO-DMO Data Manager:

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

Version:

Version Date:

2022-11-21

Restricted:

Validated:

Yes

Current State:

Final with updates expected

Compilation of MULVFS size-fractionated POC, PIC, and bSi data from 17 cruises conducted between 1973 and 2005

Abstract:

This dataset reports 74 profiles of <53um and >53um concentrations of particulate organic carbon (POC), particulate inorganic carbon (PIC), and biogenic silica (bSi) collected and analyzed by James K.B. Bishop from 17 cruises using ship-powered (Multiple Unit) Large Volume In-situ Filtration (LVFS, later MULVFS) between 1973 and 2005. The dataset was compiled by Phoebe Lam.

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Archival Copy

Version Date	Archive	Persistent Identifier (PID)	Date PID Issued
2022-11-21	Marine Biological Laboratory/Woods Hole Oceanographic Institution Library (MBLWHOI DLA)	10.26008/1912/bco-dmo.884057.1	2022-11-23

Description

This dataset compiles size fractionated (less than 53 micrometers (<53um) and greater than 53 micrometers (>53um)) particulate organic carbon (POC), particulate inorganic carbon (PIC), and biogenic silica (bSi concentrations collected by the Large Volume in-situ Filtration System (LVFS, Bishop and Edmond, 1976) and the Multiple Unit Large Volume in-situ Filtration System (MULVFS, Bishop, et al., 1985) between 1973 and 2005. A description of the compilation is given in Lam, et al. (2011), and the >53um POC, bSi, and PIC and 1-53um POC data were published in the supplemental information of that paper. This data submission adds 1-53um PIC and 0.4um-53um bSi to those data, as well as includes a few more coastal stations that were not reported in Lam, et al. (2011).

Methods & Sampling

Please see the original papers for detailed sampling and analytical methodology.

Briefly, size-fractionated particles were collected using the ship-powered (Multiple Unit) Large Volume in-situ Filtration System (LVFS, later MULVFS), typically in the upper 1000 m (Bishop and Edmond, 1976; Bishop, et al., 1985). Large particles were collected on a 293mm-diameter 53um mesh filter (Nitex, later 51um polyester) placed upstream of paired 293 millimeter (mm) diameter glass (LVFS) or quartz fiber (MULVFS) filters. This main flowpath filtered 2000-16000 liters (L) of seawater per pump. In later deployments, particles were also collected on 47mm diameter 0.4 um polycarbonate filters on a side-arm flow-path that filtered some tens of liters of seawater per pump.

Particulate inorganic carbon (PIC) was determined directly on a subsample of each size fraction on the main flowpath by measuring calcium (Ca) (by atomic absorption spectroscopy or Inductively coupled plasma mass spectrometry (ICP-MS)) following a weak acid leach, correcting for salt and organic matter Ca contributions, and assuming PIC was in CaCO₃ form.

Biogenic silica (bSi) was determined spectrophotometrically following a weak alkaline leach on a subsample of the >53um size fraction and on the >0.4um side-arm polycarbonate filter, when available. Small size fraction bSi was estimated as the difference between the >0.4um bSi and the >53um bSi when >0.4um bSi was available.

Particulate organic carbon (POC) was determined directly by combustion on subsamples of the glass fiber or quartz fiber filters for the 1-53um size fraction.Particulate organic matter (POM) on the >53um size fraction was typically estimated gravimetrically as the difference between salt-corrected dry weight and the stoichiometric masses of major phases determined chemically (CaCO₃, opal, SrSO₄, where applicable), then converted to POC assuming a biochemically-realistic plankton composition (Lam, et al., 2011).

Data Processing Description

Data Processing:
Please see Lam, et al. (2011) for more details.

BCO-DMO Processing:
- replaced "NaN" with "nd" as missing data value ("no data");
- replaced commas with semi-colons in "References" column;
- replaced "19" with "10" in the month column for rows 142-148 (cruise 8210).

Data Files

File
MULVFS_compilation.csv (Comma Separated Values (.csv), 78.49 KB) MD5:11e27766ef975843d88190b828427e78 Primary data file for dataset ID 884057

Supplemental Files

File
884057_References.pdf (Portable Document Format (.pdf), 371.65 KB) MD5:060a0ae132f813983521c79d107956c0 Complete citations of references cited in the "References" column of dataset 884057, "Compilation of MULVFS size-fractionated POC, PIC, and bSi data".

More Information about this dataset

Funding Sources

None available yet

Deployments

None available yet

Instruments

Multiple Unit Large Volume Filtration System

Supplied Name: Multiple Unit Large Volume In-situ Filtration System (MULVFS)

Supplied Description:

Instrument Type

Generic Name: Multiple Unit Large Volume Filtration System

Acronym: MULVFS

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/32/

Generic Description:

The Multiple Unit Large Volume Filtration System (MULVFS) was first described in Bishop et al., 1985 (doi: 10.1021/ba-1985-0209.ch009). The MULVFS consists of multiple (commonly 12) specialized particulate matter pumps, mounted in a frame and tethered to the ship by a cable (Bishop et al., 1985; Bishop and Wood, 2008). The MULVFS filters particulates from large volumes of seawater, although the exact protocols followed will vary for each project.

Parameters

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

Supplied Name	Supplied description	Supplied Units	Standard Name
StationName	short description of station	unitless	station
num	profile number (sequential)	unitless	cast
lat	latitude (negative values = South)	degrees North	lat
long	longitude (negative values = West)	degrees East	lon
year	year of sampling Format: %Y	unitless	year
month	month of sampling Format: %m	unitless	month
MLD	Mixed Layer Depth, as reported in original reference, or where Δσθ >0.05 kg/m3	meters (m)	depth_mixed_layer
zeu	Euphotic zone depth; see Lam et al., 2011 (doi: 10.1029/2010gb003868) for details	meters (m)	depth
cruiseID	Cruise ID (cruise number if available; if not, a unique numeric cruiseID was created based on year and month of cruise)	unitless	cruise_id
station	Station ID as reported in original reference	unitless	station
depth	Depth of pump sample	meters (m)	depth
lt53POCumolkg	1-53um POC concentration	micromoles per kilogram (umol/kg)	POC
gt53POCumolkg	>53um POC concentration	micromoles per kilogram (umol/kg)	POC
lt53PICumolkg	1-53um PIC concentration	micromoles per kilogram (umol/kg)	PIC
gt53PICumolkg	>53um PIC concentration	micromoles per kilogram (umol/kg)	PIC
lt53bSiumolkg	0.4-53um bSi concentration	micromoles per kilogram (umol/kg)	Si_bio
gt53bSiumolkg	>53um bSi concentration	micromoles per kilogram (umol/kg)	Si_bio
References	Numbers to full references with more information about the samples. See Supplemental File "884057_References.pdf" for a list of the full citations.	unitless	reference_paper

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Dataset: Compilation of MULVFS size-fractionated POC, PIC, and bSi data