Dataset: MOCNESS Filtered Volumes
Deployment: AT42-13

View Data: For data, See Dataset Metadata Page: https://www.bco-dmo.org/dataset/783036

Principal Investigator:

Robert K. Cowen (Oregon State University, OSU-HMSC)

Co-Principal Investigator:

Su Sponaugle (Oregon State University, OSU-HMSC)

Kelly Rakow Sutherland (University of Oregon)

Contact:

Kelsey Swieca (Oregon State University, OSU-HMSC)

BCO-DMO Data Manager:

Karen Soenen (Woods Hole Oceanographic Institution, WHOI BCO-DMO)

Project:

Collaborative Research: Mesozooplankton food webs in intermittent upwelling systems: An overlooked link in a productive ocean (MEZCAL)

Version:

Deployment Synonyms:

S19

Expand/Collapse All

Description

Methods & Sampling

Dataset acquisition description

Sampling happend along two transects in winter and in summer 2018 and 2019. One transect was off of Trinidad Head, CA and the other Newport, OR (See Figure in Supplemental Docs). Each transect consisted of five target stations during the day and at night with replicate tows at each station. However, this sampling design was often modified at sea. Please refer to the dataset for completed stations.

To sample a range of zooplankton simultaneously, a coupled Multiple Opening and Closing Net Environmental Sampling System (MOCNESS) consisting of a 4m2 net fitted with 1 mm mesh and a 1 m2 net with 150 μm mesh was used (Guigand et al. 2005). The former is referred to as the Moc4 and the latter the Moc1. The Moc4 and Moc1 each have 5 nets (numbered 0-4) to sample discrete depths. Please see above for depth descriptions. All tows were sent to a target depth of 100 m.

Data Processing Description

Dataset Processing Description

All data were processed in R (v. 3.6.1).

BCO-DMO Processing Notes:

Adjusted column headers to meet database requirements
Reformatted date and start/end times to ISO format (UTC, timezone)
Round net volumes to 2 decimals

More information about this dataset deployment

Funding

Award Number	Funding Source
OCE-1737364	NSF Division of Ocean Sciences
OCE-1737399	NSF Division of Ocean Sciences

Instruments

MOCNESS

Supplied Name:

Supplied Description:

The MOCNESS systems consists of a 4m2 net fitted with 1 mm mesh and a 1 m2 net with 150 μm mesh (Guigand et al. 2005). The former is referred to as the Moc4 and the latter the Moc1. The Moc4 and Moc1 each have 5 nets (numbered 0-4) to sample discrete depths.

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.

Parameters

Supplied Name	Supplied description	Supplied Units	Standard Name
Cruise	Cruise identification number: S=summer; W=winter; 18=2018 ; 19=2019	unitless	cruise_id
Location	Sampling location: NH=Newport or TR=Trinidad Head; CA	unitless	site
Station	Location along transect: 1=closest nearshore; 5=furthest offshore	unitless	transect_station
Transect	Sampling transect: MaN=First night transect; MbN=Second replicate night transect; MaD=First day transect; MbD=Second replicate day transect	unitless	transect
Haul	A station identifier for labeling purposes and quick reference. Station weret consecutively numbered as they were sampled.	unitless	sta_id
Net_no	Net open on MOCNESS: 0=oblique; 1=100-75m; 2=75-50m; 3=50-25m; 4=25m-surface	unitless	net
moc_1_volume_m3	Filtered volume by a net with a 4m2 opening and fitted with a 1 mm mesh	liter per cubic meter (l/m3)	vol_filt
moc_4_volume_m3	Filtered volume by a net with a 1m2 opening and fitted with a 150 um mesh	liter per cubic meter (l/m3)	vol_filt
ISO_DateTime_UTC_Start	Date /Time of the start of the net towing in UTC timezone, ISO formatted (yyyy-mm-ddTHH:MM:SSZ)	units	ISO_DateTime_UTC
ISO_DateTime_UTC_End	Date /Time of the end of the net towing in UTC timezone, ISO formatted (yyyy-mm-ddTHH:MM:SSZ)	units	ISO_DateTime_UTC
Station_lat	Latitude of tow start location, south is negative	decimal degrees	lat
Station_lon	Longitude of tow end location, west is negative	decimal degrees	lon
Notes	At certain stations only oblique tows were done, these are indicated by ‘oblique’ in the Notes section	unitless	comment
time_start_GMT	Time of the start of the net towing in UTC timezone, ISO formatted (HH:MM:SS)	unitless	time_begin
time_end_GMT	Time of the end of the net towing in UTC timezone, ISO formatted (HH:MM:SS)	unitless	time_end
Date	Sample date in GMT timezone, ISO format (yyyy-mm-dd).	unitless	date

Database

Contribute Data

Dataset: MOCNESS Filtered Volumes
Deployment: AT42-13

Dataset acquisition description

Dataset Processing Description

Database

Contribute Data

Dataset: MOCNESS Filtered VolumesDeployment: AT42-13

Dataset acquisition description

Dataset Processing Description

Dataset: MOCNESS Filtered Volumes
Deployment: AT42-13