Dataset: fattyacids
Deployment: TT011

Fatty acid fluxes from sediment trap samples

Principal Investigator:

Stuart Wakeham (Skidaway Institute of Oceanography, SkIO)

BCO-DMO Data Manager:

Cynthia L. Chandler (Woods Hole Oceanographic Institution, WHOI BCO-DMO)

Project:

U.S. JGOFS Equatorial Pacific (EqPac)

Version:

December 1, 1995

Deployment Synonyms:

EqPac Fall Survey

Version Date:

1995-12-01

Data URL:

https://www.bco-dmo.org/dataset-deployment/450934/data

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Description

Fatty acid fluxes, Indented Rotary Sphere (IRS) Floating sediment trap samples

Methods & Sampling

Dataset acquisition description

See Platform deployments for cruise specific documentation

Deployment-specific acquisition description

   PI:              Stuart Wakeham
   dataset:         Fatty acid fluxes, Indented Rotary Sphere
                    sediment trap samples
   dates:           August 5, 1992 to September 18, 1992
   location:        N: 12  S: -12  W: -140  E: -140
   project/cruise:  EqPac/TT011 - Fall Survey
   ship:            Thomas Thompson
 
   Sampling Methodology: Traps deployed at 100 meters for durations of 1.5 to 2.5     
   days.  For specifics on trap deployment/recovery positions and times see event log, PI 
   Hedges. 

   Methodology:  Sediment trap material was filtered onto 90 mm glass fiber
   filters (A/E) and frozen.  Filters with trap material and sediments were
   Soxhlet extracted with methylene chloride-methanol (2:1) and the extracts
   partitioned into the organic phase with 5% NaCl.  The "lipid extracts"
   were saponified with 0.5N KOH/methanol, with "neutral lipids" extracted
   out of basic solution and "acids" extracted out of acidic solution.
   Neutral lipids were silylated with BSTFA and fatty acids were methylated
   with diazomethane.  Anaylsis was by gas chromatography and gas
   chromatography-mass spectrometry.

 
   Notes:
   Note due to the nature of this data set the standard suite of data
   manipulative tools (plot/other options) on the JGOFS Data System 
   do not apply.
  
   fatty_acid names have been prefixed with (fa_) and this prefix must be 
   ignored when deciphering the true fatty acid name.  Names are defined as 
   number carbon atoms:number of double bonds.  Prefixes i=iso, a=anteiso.
   
   The field labels n12 thru s12 are nominal latitudes for trap deployments
   along 140 west.
  
   Traps deployed at 100 meters for durations of 1.5 to 2.5 days.  For specifics
   on trap deployment/recovery positions and times see event log, PI Hedges. 
  
   fatty acid fluxes = reported as ug/m^2/day
   nd = no/bad data

Data Processing Description

Dataset Processing Description

More information about this dataset deployment

Instruments

Sediment Trap - IRS

Supplied Name: IRS Sediment Trap

Supplied Description:

Instrument Type

Generic Name: Sediment Trap - IRS

Acronym: Sed Trap - IRS

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/33/

Generic Description:

Sediment traps are specially designed containers deployed in the water column for periods of time to collect particles from the water column falling toward the sea floor. In general a sediment trap has a jar at the bottom to collect the sample and a broad funnel-shaped opening at the top with baffles to keep out very large objects and help prevent the funnel from clogging. The Indented Rotating Sphere (IRS) Sediment Trap is described in Peterson et al. (Field evaluation of a valved sediment trap. 1993. Limnology and Oceanography, 38, pp. 1741-1761 and Novel techniques for collection of sinking particles in the ocean and determining their settling rates. 2005. Limnology and Oceanography Methods 3, pp. 520-532). The IRS trap consists of four cylindrical modules; a particle interceptor, an IRS valve; a skewed funnel, and an eleven sample carousel (designated IRSC trap). The key to the trap design is the patented IRS valve located between the particle interceptor and particle accumulator portions of the trap. The valve and carousel are regulated by a TattleTale IVA (manufactured by Onset Computer Corp.) microprocessor and custom software. The IRS sediment trap was specifically designed to exclude zooplankton (Trull et al. 2008. Deep-Sea Research II v.55 pp. 1684-1695).

Parameters

Supplied Name	Supplied description	Supplied Units	Standard Name
n12 thru s12	nominal latitudes for trap deployments along 140W	degrees	no_bcodmo_term
Fatty_acid	fluxes of fatty acids names have been prefixed with (fa_). This prefix must be ignored when deciphering the fatty acid name. Names are defined as number carbon atoms:number of double bonds. Prefixes i=iso, a=anteiso.	ug/m^2/d	no_bcodmo_term

Database

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Dataset: fattyacids
Deployment: TT011

Dataset acquisition description

Deployment-specific acquisition description

Dataset Processing Description

Database

Contribute Data

Dataset: fattyacidsDeployment: TT011

Dataset acquisition description

Deployment-specific acquisition description

Dataset Processing Description

Dataset: fattyacids
Deployment: TT011