Dataset: MOCNESS Deployment Summary
Deployment: KM1418

Summary deployment data for MOCNESS 1m2 and 10m2 tows

Principal Investigator:

Jeffrey C. Drazen (University of Hawai'i, UH)

Co-Principal Investigator:

Hilary G. Close (University of Hawaiʻi at Mānoa, HIGP)

Cecelia Hannides (University of Hawai'i, UH)

Brian N. Popp (University of Hawaiʻi at Mānoa, HIGP)

Kanesa Seraphin (University of Hawai'i, UH)

BCO-DMO Data Manager:

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

Project:

Evaluating the relative importance of suspended and sinking particles to the meso and bathypelagic food web in the central North Pacific (SuspendSinkPart)

Current State:

Final no updates expected

Version:

final

Version Date:

2016-01-27

Data URL:

https://www.bco-dmo.org/dataset-deployment/636606/data

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Description

Summary data from 1m2 and 10m2 MOCNESS tows conducted off Hawaii. Start and end of each net deployment pressure, fluorometry,conductivity, salinity, temperature,potential temperature and potential density. These data represent 33 tows from three cruises.

DMO notes:
Changed MOCNESS time column to yrday_local and used it to get hour/min.
The first tow in each cruise has incorrect MOCNESS time when the tow crossed midnight. The hour and minute calculations are correct but for some reason the MOCNESS incremented a day when a net was opened. This is only true for the first tow in each cruise.
Added year column to help with time conversions.

Methods & Sampling

Dataset acquisition description

Standard Multiple Opening Closing Net Environmental Sampling Systems (MOCNESS; Wiebe et al., 1976; Wiebe et al., 1985; Sameoto et al., 2000) were used to sample zooplankton (1m2 mouth opening system) and micronekton (10m2 mouth opening system) from the surface to 1500m depth. Nets were first deployed to maximum depth and slowly retrieved towards the surface. Tows were conducted during the day (typically 09:30-15:30) or during the night (typically 21:30-03:30) so as to avoid migration times around sunrise and sunset. All raw data files are available upon request.

Data Processing Description

Dataset Processing Description

More information about this dataset deployment

Funding

Award Number	Funding Source
OCE-1333734	NSF Division of Ocean Sciences

Instruments

MOCNESS1

Supplied Name: MOCNESS_1

Supplied Description:

The 1-meter-squared MOCNESS that was used was a standard MOCNESS.

Instrument Type

Generic Name: MOCNESS1

Acronym: MOC1

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. The MOCNESS-1 carries nine 1-m2 nets usually of 335 micrometer mesh and is intended for use with the macrozooplankton. All nets are black to reduce contrast with the background. A motor/toggle release assembly is mounted on the top portion of the frame and stainless steel cables with swaged fittings are used to attach the net bar to the toggle release. A stepping motor in a pressure compensated case filled with oil turns the escapement crankshaft of the toggle release which sequentially releases the nets to an open then closed position on command from the surface. -- from the MOCNESS Operations Manual (1999 + 2003).

MOCNESS10

Supplied Name: MOCNESS_10

Supplied Description:

The 10-square-meter mouth opening MOCNESS was a standard MOCNESS.

Instrument Type

Generic Name: MOCNESS10

Acronym: MOC10

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

Generic Description:

The Multiple Opening/Closing Net and Environmental Sensing System (MOCNESS) is based on the Tucker Trawl principle (Tucker, 1951). The MOCNESS-10 (with 10 m^2 nets) carries 6 nets of 3.0-mm circular mesh which are opened and closed sequentially by commands through conducting cable from the surface (Wiebe et al., 1976). In this system, "the underwater unit sends a data frame, comprising temperature, depth, conductivity, net-frame angle, flow count, time, number of open net, and net opening/closing, to the deck unit in a compressed hexadecimal format every 2 seconds and from the deck unit to a microcomputer every 4 seconds" (Wiebe et al., 1985).

Parameters

Supplied Name	Supplied description	Supplied Units	Standard Name
cruise	identification of cruise	text	cruiseid
year	year	number	year
datatype	sampling method - instrument type; e.g. MOCNESS-1 or MOCNESS-10	text	datatype
tow	tow number;encrypted to include the net size; the sequential tow number; and the year	alphanumeric	tow
day_night	time of day the tow took place; reference to day or night operation	text	time_of_day
net	MOCNESS net number:0-9	number	net
event	start or end of tow	text	action
yrday_local	year day as a decimal; based on Julian calendar; local	decimal number	yrday_local
time_local	time of tow; local time using 24 hour clock	decimal minute	time_local
ISO_DateTime_Local	time standard based on ISO 8601:2004(E)	YYYY-MM-DDTHH:MM:SS[.xx][+/-TZ]	ISO_DateTime_Local
press_tow	depth of tow converted to pressure	decibars	press
temp	temperature at the recorded pressure	degrees Celsius	temp
theta	potential temperature	degrees Celsius	potemp
sal	salinity calculated from conductivity; bad values are set to 50	unitless	sal
sigma	sigma theta or potential density	unitless	sigma_0
net_angle	angle of net frame relative to vertical (0-89 degrees)	degrees	tow_angle
flow_counts	consecutive flow counts	counts	flow
horizontal_velocity	horizontal net velocity	meters per second	hzvel
vertical_velocity	vertical net velocity	meters per second	vtvel
volume_filt	volume filtered by the net	cubic meters	vol_filt
fluor	relative fluorescence (0-5 volts)	volts	flvolt
lat	latitude; positive = North	decimal degrees	lat
lon	longitude; negative = West	decimal degrees	lon
comments	information about the tows	text	comment

Database

Contribute Data

Dataset: MOCNESS Deployment Summary
Deployment: KM1418

Dataset acquisition description

Dataset Processing Description

Database

Contribute Data

Dataset: MOCNESS Deployment SummaryDeployment: KM1418

Dataset acquisition description

Dataset Processing Description

Dataset: MOCNESS Deployment Summary
Deployment: KM1418