Dataset: OPC_MOCNESS
Deployment: NBP-97-03

Optical Plankton Counter data - MOCNESS Tows

Principal Investigator:

Dr Mark Huntley (University of California-San Diego Scripps, UCSD-SIO)

Co-Principal Investigator:

Meng Zhou (University of Massachusetts Boston, UMB-SMS)

BCO-DMO Data Manager:

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

Project:

U.S. JGOFS Antarctic Environment and Southern Ocean Process Study (AESOPS)

Version:

February 27, 1999

Deployment Synonyms:

NBP9703, NBP97_3

Version Date:

1999-02-27

Data URL:

https://www.bco-dmo.org/dataset-deployment/451086/data

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Description

Optical Plankton Counter data - MOCNESS Tows

Methods & Sampling

Dataset acquisition description

Deployment-specific acquisition description

   PI:              Mark Huntley and Meng Zhou
   of:              Scripps Institution of Oceanography (Huntley) and
                    University of Minnesota, Duluth (Zhou)
   dataset:         Optical Plankton Counter data - MOCNESS Tows
   dates:           April 14, 1997 to April 29, 1997
   location:        N: -73.999  S: -77.9385  W: 168.9599  E: -176.1732
   project/cruise:  AESOPS/NBP-97-3 - Ross Sea Process 3 Cruise
   ship:            R/V Nathaniel B. Palmer
 
   Sampling Methodology
 
   Note 1: The class will not show up if nothing were counted within that class.
 
   Note 2: OPC data is reported on a Log10 basis.

Data Processing Description

Dataset Processing Description

More information about this dataset deployment

Instruments

MOCNESS

Supplied Description:

MOCNESS (Multiple Opening and Closing Nets Envionment Sampling System)

Instrument Type

Generic Name: MOCNESS

Community Identifier: http://vocab.nerc.ac.uk/collection/L22/current/NETT0097/

Generic Description:

The Multiple Opening/Closing Net and Environmental Sensing System or MOCNESS is a family of net systems based on the Tucker Trawl principle. There are currently 8 different sizes of MOCNESS in existence which are designed for capture of different size ranges of zooplankton and micro-nekton Each system is designated according to the size of the net mouth opening and in two cases, the number of nets it carries. The original MOCNESS (Wiebe et al, 1976) was a redesigned and improved version of a system described by Frost and McCrone (1974).(from MOCNESS manual) This designation is used when the specific type of MOCNESS (number and size of nets) was not specified by the contributing investigator.

Optical Plankton Counter

Supplied Description:

Instrument Type

Generic Name: Optical Plankton Counter

Acronym: OPC

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/352/

Generic Description:

An OPC provides quantitative measurements of abundance and sizes of mesozooplankton ranging between approximately 0.25 and 14 mm in Equivalent Spherical Diameter (ESD), and has the capability to integrate measurements from other sensors such as a CTD, fluorometer and Global Positioning System (GPS). It can be deployed on a variety of instruments such as SeaSoar, Aries, Scanfish, MOCNESS, a bongo net or simple towing frame. The data from an OPC are typically transmitted to a data acquisition computer through two conducting wires in a towing cable at real time, but it can also be modified to have an internal memory. Large amounts of data are produced. The procedures employed by OPC users vary from; i) estimating integrated biomass by integrating the OPC size distributions, ii) comparing size distributions between OPC and net samples, and iii) simply isolating a size region in the OPC size distribution which correspond solely to specific taxa, eg. Calanus spp..

from: Zhou, M., Tande, K., 2002. Optical Plankton Counter Workshop. GLOBEC Report 17, University of Tromso, Tromso

Parameters

Supplied Name	Supplied description	Supplied Units	Standard Name
event	event number from event log		event
sta	station number from event log		no_bcodmo_term
depth_r	depth range sampled lt_150 = zero to 150 meters gt_150 = greater than 150 meters		no_bcodmo_term
vol_filt	water volume filtered	m^3	vol_filt
counts_tot	total counts		no_bcodmo_term
opc_class	class number		no_bcodmo_term
opc_wt_mid	middle value of each weight class	ugC	no_bcodmo_term
opc_wt_biomass	normalized biomass spectra - weight classes	1/m^3	no_bcodmo_term
opc_wt_abund	normalized abundance spectra - weight classes	1/ugC*m^3	no_bcodmo_term
opc_size_mid	middle value of each ESD size class	mm	no_bcodmo_term
opc_size_abund	normalized abundance spectra - ESD size classes	1/mm*m^3	no_bcodmo_term
opc_size_biovol	normalized bio-volume spectra - ESD size classes	mm^3/mm*m^3	no_bcodmo_term
opc_vol_mid	middle value of each volume class	mm^3	no_bcodmo_term
opc_vol_biovol	normalized bio-volume spectra - volume classes	1/m^3	no_bcodmo_term

Database

Contribute Data

Dataset: OPC_MOCNESS
Deployment: NBP-97-03

Dataset acquisition description

Deployment-specific acquisition description

Dataset Processing Description

Database

Contribute Data

Dataset: OPC_MOCNESSDeployment: NBP-97-03

Dataset acquisition description

Deployment-specific acquisition description

Dataset Processing Description

Dataset: OPC_MOCNESS
Deployment: NBP-97-03