Dataset: Bongo disp. volumes
Deployment: AL9906

Bongo displacement volume data, GLOBEC Georges Bank broadscale cruises, 1995-1999

Co-Principal Investigator:

Dr John Green (National Marine Fisheries Service, NMFS)

Dr David Mountain (National Marine Fisheries Service, NMFS)

BCO-DMO Data Manager:

Ms Dicky Allison (Woods Hole Oceanographic Institution, WHOI BCO-DMO)

Project:

U.S. GLOBEC Georges Bank (GB)

Data URL:

https://www.bco-dmo.org/dataset-deployment/449833/data

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Description

BioVolume Data from Bongo Tows during Broadscale Cruises, 1995-1999
Dave Mountain, Jack Green and Joe Kane, NMFS

This displacement volume data comes from one net with a mesh size of 333 um.

Methods & Sampling

Dataset acquisition description

This displacement volume data comes from one net with a mesh size of 333 um.

Deployment-specific acquisition description

This displacement volume data comes from one net with a mesh size of 333 um.

Data Processing Description

Dataset Processing Description

column header	meaning	units
raw_vol	raw volume	cc
displ_vol	displacement volume	cc/100m3
haul_factor	haul factor	100/volume filtered (m3)

displacement volume is a normalized displacement volume and is calculated: raw_vol * haul_factor

Deployment-specific processing description

<table align="center" width="80%">
<tbody><tr align="left"><th> column header</th> <th> meaning </th> <th> units</th> </tr>

<tr align="left">
<td>raw_vol</td> <td> raw volume</td> <td>cc</td></tr>
<tr align="left">
<td>displ_vol</td> <td>displacement volume</td> <td>cc/100m3</td></tr>
<tr align="left">

<td>haul_factor</td> <td>haul factor</td> <td>100/volume filtered (m3)</td></tr>

</tbody></table>

displacement volume is a normalized displacement volume and is calculated:
<b>raw_vol * haul_factor</b>

More information about this dataset deployment

Funding

Award Number	Funding Source
unknown GB NOAA	National Oceanic and Atmospheric Administration
unknown GB NSF	National Science Foundation

Instruments

Bongo Net

Supplied Name: Bongo Nets

Supplied Description:

Bongo net with a mesh size of 333 um.

Instrument Type

Generic Name: Bongo Net

Community Identifier: http://vocab.nerc.ac.uk/collection/L22/current/NETT0009/

Generic Description:

A Bongo Net consists of paired plankton nets, typically with a 60 cm diameter mouth opening and varying mesh sizes, 10 to 1000 micron. The Bongo Frame was designed by the National Marine Fisheries Service for use in the MARMAP program. It consists of two cylindrical collars connected with a yoke so that replicate samples are collected at the same time. Variations in models are designed for either vertical hauls (OI-2500 = NMFS Pairovet-Style, MARMAP Bongo, CalVET) or both oblique and vertical hauls (Aquatic Research). The OI-1200 has an opening and closing mechanism that allows discrete "known-depth" sampling. This model is large enough to filter water at the rate of 47.5 m3/minute when towing at a speed of two knots. More information: Ocean Instruments, Aquatic Research, Sea-Gear

Parameters

Supplied Name

Supplied description

Supplied Units

Standard Name

raw_vol

raw volume

raw_vol

displ_vol

displacement volume is a normalized displacement volume and is calculated: raw_vol * haul_factor.

Displacement volume is the volume of animals per 100 cubic meters of seawater.

cc per 100m3 water

disp_vol

haul_factor

haul factor.
A standard haul factor (SHF) was calculated for each Bongo net tow to make them comparable
and to allow estimation of areal abundance. The SHF is calculated by the formula:
SHF = 10D/V

where D = depth of haul = cosine of the average angle of stray of the towing cable
multiplied by cable length (m)

V = total volume of water (m3) strained during the haul.

V = R * a * p

where R = total number of revolutions of the current meter during the haul

a = area (m2) of the mouth of the net

p = length of the column of water needed produce one revolution of the current meter

100/volume filtered (m3)

haul_factor

cruiseid

cruise identifier e.g. AL9505 is RV/Albatross-9505

cruiseid

year

year of sampling. format: yyyy

unitless

year

cast

cast number

integer

cast

station

station number

integer

station

station_std

standard station number

integer

station_std

day_local

day of month in local time

1-31

day_local

month_local

month in local time

1-12

month_local

time_local

local time

HHmm

time_local

lat

latitude: North is positive and negative denotes South

decimal degrees

lat

lon

longtude: East is positive and negative denotes West

decimal degrees

no_bcodmo_term

depth_w

depth of the water

cubic meters

depth_w

depth

depth of the sample

meters

depth

region

code for region of NW Atlantic: GBK= Georges Bank; GOM=Gulf of Maine; SNE=Southern New England; SSH=Slope/Shelf; UNK=unknown

text

region

yrday_local

local day and decimal time: as 326.5 for the 326th day of the year or November 22 at 1200 hours (noon)

yrday_local

Database

Contribute Data

Dataset: Bongo disp. volumes
Deployment: AL9906

BioVolume Data from Bongo Tows during Broadscale Cruises, 1995-1999
Dave Mountain, Jack Green and Joe Kane, NMFS

Dataset acquisition description

Deployment-specific acquisition description

Dataset Processing Description

Deployment-specific processing description

Database

Contribute Data

Dataset: Bongo disp. volumesDeployment: AL9906

BioVolume Data from Bongo Tows during Broadscale Cruises, 1995-1999 Dave Mountain, Jack Green and Joe Kane, NMFS

Dataset acquisition description

Deployment-specific acquisition description

Dataset Processing Description

Deployment-specific processing description

Dataset: Bongo disp. volumes
Deployment: AL9906

BioVolume Data from Bongo Tows during Broadscale Cruises, 1995-1999
Dave Mountain, Jack Green and Joe Kane, NMFS