Dataset: MOCNESS Filtered Volumes

Name: Multiple Opening and Closing Net Environmental Sampling System (MOCNESS) water filtering volumes from 2018 and 2019 taken in the Northern California Current waters.
Published: 2023-02-16
Keywords: Plankton imagery, MOCNESS, Northern California Current, fine-scale, oceans

Cite This Dataset

DOI:10.26008/1912/bco-dmo.783036.2

Spatial Extent: N:44.652 E:-124.267 S:41.0583 W:-125.117

Temporal Extent: 2018-02-17 - 2019-07-25

Project:

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

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)

Version:

Version Date:

2023-02-16

Restricted:

Validated:

Yes

Current State:

Final no updates expected

Multiple Opening and Closing Net Environmental Sampling System (MOCNESS) water filtering volumes from 2018 and 2019 taken in the Northern California Current waters.

Abstract:

Multiple Opening and Closing Net Environmental Sampling System (MOCNESS) water filtering volumes from 2018 and 2019 taken in the Northern California Current waters sampled aboard the R/V Sikuliaq, R/V Sally Ride and R/V Atlantis.

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Archival Copy

Version Date	Archive	Persistent Identifier (PID)	Date PID Issued
2023-02-16	Marine Biological Laboratory/Woods Hole Oceanographic Institution Library (MBLWHOI DLA)	10.26008/1912/bco-dmo.783036.2	2023-02-16
2021-01-19	Marine Biological Laboratory/Woods Hole Oceanographic Institution Library (MBLWHOI DLA)	10.26008/1912/bco-dmo.783036.1	2021-02-26

Methods & Sampling

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

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

Data Files

File
mocness_volumes.csv (Comma Separated Values (.csv), 57.83 KB) MD5:d610844b3d72086eeaf2cde1ea42f088 Primary datafile for dataset 783036, version 2.

Supplemental Files

File
MOCNESS Towing Stations filename: NH_and_TR_stations_bathy.png (Portable Network Graphics (.png), 30.10 KB) MD5:5092794b987cd197ca6344dc3ca99da5 MOCNESS towing stations related to BCO-DMO dataset 783036 in .png format. Towing stations with bathymetry basemap.

More Information about this dataset

Funding Sources

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

Deployments

Deployment	Synonyms	Start Date	Platform	Investigator
AT42-13	S19	2019-07-15	R/V Atlantis	Robert K. Cowen (Chief Scientist)	data info
SKQ201804S	W18	2018-02-17	R/V Sikuliaq	Robert K. Cowen (Chief Scientist)	data info
SKQ201903S	W19	2019-03-03	R/V Sikuliaq	Robert K. Cowen (Chief Scientist)	data info
SR1810	S18	2018-07-06	R/V Sally Ride	Robert K. Cowen (Chief Scientist)	data info

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

Date and time formats are described in python strftime() syntax.

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) Format: %Y-%m-%dT%H:%M:%SZ	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) Format: %Y-%m-%dT%H:%M:%SZ	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) Format: %H:%M:%S	unitless	time_begin
time_end_GMT	Time of the end of the net towing in UTC timezone, ISO formatted (HH:MM:SS) Format: %H:%M:%S	unitless	time_end
Date	Sample date in GMT timezone, ISO format (yyyy-mm-dd). Format: %Y-%m-%d	unitless	date

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Dataset: MOCNESS Filtered Volumes