Dataset: Copepod Abundances in MOCNESS tows
Deployment: SKQ201701S

Data are from vertically-stratified MOCNESS tows (8 or 9 nets per tow) through and within the Oxygen Minimum Zone (OMZ). Tows sampled various depth ranges between 1200 m to the surface and included paired day and night tows for many strata. Sampling intervals ranged from 100 or 200 m thick in standardized tows from 1000 m depth, and from 25, 50, or 150 m thick in fine-scale tows covering narrower depth intervals. Zooplankton collection occurred on the upcast portion of a tow. Several horizontally-sequenced tows were also done at specific mesopelagic depths within the OMZ. Large water volumes were filtered for most deeper and OMZ nets where abundances were low. MOCNESS sensors including a flowmeter provided environmental data. Tows were done over the course of a decade (2007 - 2017) during 4 cruises. See published papers below for details of tows and sampling schemes.

Net mesh size was 153 µm or 222 µm. Upon retrieval, samples or splits were stored in 4% sodium borate-buffered formaldehyde seawater. Sorting and identifications of whole samples or splits occurred later onshore by a trained technician using stereo- and compound microscopes. The copepod species shown in this dataset were selected to highlight different types of distributional responses to OMZ variability and are the basis for the Wishner et al. (2020) paper (Table S1 in that paper).

Data Processing Description

Dataset Processing Description

Data Processing: Abundances for each species were calculated for each net after accounting for split size and volume filtered and are reported as numbers per 1000 cubic meters of water filtered.

Column names:
Abundances are reported as the number of individual copepod species in each net (#/1000 m3).
Column names are shortened for ease of use (see parameter descriptions below for complete names).
Most abundances are for adults only, but for some species, younger life history stages are also shown.
Adults = total of adult males and females.
"C" numbers are copepodite life history stages (C1 – C5) for some species.
M = males, F = females
nd = no data (those species were not searched for in those nets)

BCO-DMO Processing:
- joined the abundance data with the corresponding event logs or MOCNESS logs to obtain the sampling latitude, longitude, date, time, and day/night columns;
- converted Date_Local to YYYY-MM-DD format;
- added date/time UTC fields in ISO8601 format;
- added column denoting the local time zone;
- renamed fields to comply with BCO-DMO naming conventions (removed spaces and special characters).

More information about this dataset deployment

Funding

Award Number	Funding Source
OCE-0526502	NSF Division of Ocean Sciences
OCE-0526545	NSF Division of Ocean Sciences
OCE-1459243	NSF Division of Ocean Sciences

Instruments

Microscope - Optical

Supplied Name: stereo- and compound microscopes

Supplied Description:

Sorting and identifications of whole samples or splits occurred onshore by a trained technician using stereo- and compound microscopes.

Instrument Type

Generic Name: Microscope - Optical

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/LAB05/

Generic Description:

Instruments that generate enlarged images of samples using the phenomena of reflection and absorption of visible light. Includes conventional and inverted instruments. Also called a "light microscope".

MOCNESS1

Supplied Name: 1 m2 MOCNESS

Supplied Description:

The first two cruises used the classic MOCNESS with its standard deck unit and sensors. The two later cruises used an upgraded MOCNESS with a Sea-Bird 911CTD for sensors and modified software. (See Wishner et al. (2020) for more details.)

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).

Parameters

Supplied Name	Supplied description	Supplied Units	Standard Name
Cruise	Cruise ID	unitless	cruise_id
Station	Station number; note: station numbers are cruise-specific (not necessarily the same location between cruises)	unitless	station
Station_Name	Station name; corresponds to station names in Table 1 of Wishner et al. (2020): TB = Tehuantepec Bowl (SJ07 and KN0819502 cruises); CRD = Costa Rica Dome (SJ07 and KN0819502 cruises); OC = Oceanus cruise station; SKQ = Sikuliaq cruise station.	unitless	sta_name
Tow	MOCNESS tow number	unitless	tow
Net_ID	Identifying number for each of the 8 or 9 nets in a MOCNESS tow. The first 3 digits are the Tow number and the last digit is the net number. Most tows were done with a vertically-stratified sampling scheme, with the first net being the deepest one and the following nets sequentially shallower. Some tows were horizontally-sequenced or had other sampling profiles.	unitless	net
Start_Depth	Depth at which net was opened	meters (m)	depth_begin
End_Depth	Depth at which net was closed	meters (m)	depth_end
Vol_Filt	Volume of water filtered through net, based on electronic flowmeter data	cubic meters (m^3)	vol_filt
Dis_pal_Adults	Abundance of Disseta palumbii (adults) in the net	number of individuals per 1000 cubic meters (#/1000 m^3)	abundance
Dis_pal_C5	Abundance of Disseta palumbii (C5 stage) in the net	number of individuals per 1000 cubic meters (#/1000 m^3)	abundance
Eua_mag_Adults	Abundance of Euaugaptilus magnus (adults) in the net	number of individuals per 1000 cubic meters (#/1000 m^3)	abundance
Eua_nod_Adults	Abundance of Euaugaptilus nodifrons (adults) in the net	number of individuals per 1000 cubic meters (#/1000 m^3)	abundance
Euc_cal_Adults	Abundance of Eucalanus californicus (adults) in the net	number of individuals per 1000 cubic meters (#/1000 m^3)	abundance
Euc_cal_C4_M	Abundance of Eucalanus californicus (C4 stage males) in the net	number of individuals per 1000 cubic meters (#/1000 m^3)	abundance
Euc_cal_C5_M	Abundance of Eucalanus californicus (C5 stage males) in the net	number of individuals per 1000 cubic meters (#/1000 m^3)	abundance
Euc_cal_C5_F	Abundance of Eucalanus californicus (C5 stage females) in the net	number of individuals per 1000 cubic meters (#/1000 m^3)	abundance
Euc_ine_Adults	Abundance of Eucalanus inermis (adults) in the net	number of individuals per 1000 cubic meters (#/1000 m^3)	abundance
Euc_ine_C1	Abundance of Eucalanus inermis (C1 stage) in the net	number of individuals per 1000 cubic meters (#/1000 m^3)	abundance
Euc_ine_C2	Abundance of Eucalanus inermis (C2 stage) in the net	number of individuals per 1000 cubic meters (#/1000 m^3)	abundance
Euc_ine_Imm_C3_C4F_C5F	Abundance of Eucalanus inermis (immature, C3 stage, C4 stage females, and C5 stage females) in the net	number of individuals per 1000 cubic meters (#/1000 m^3)	abundance
Euc_ine_C4_M	Abundance of Eucalanus inermis (C4 stage males) in the net	number of individuals per 1000 cubic meters (#/1000 m^3)	abundance
Euc_ine_C5_M	Abundance of Eucalanus inermis (C5 stage males) in the net	number of individuals per 1000 cubic meters (#/1000 m^3)	abundance
Euc_spi_Adults	Abundance of Eucalanus spinifer (adults) in the net	number of individuals per 1000 cubic meters (#/1000 m^3)	abundance
Gae_kru_Adults	Abundance of Gaetanus kruppi (adults) in the net	number of individuals per 1000 cubic meters (#/1000 m^3)	abundance
Gae_pse_Adults	Abundance of Gaetanus pseudolatifrons (adults) in the net	number of individuals per 1000 cubic meters (#/1000 m^3)	abundance
Hal_lon_Adults	Abundance of Haloptilus longicornis (adults) in the net	number of individuals per 1000 cubic meters (#/1000 m^3)	abundance
Het_lon_Adults	Abundance of Heterostylites longicornis/longioperculus (adults) in the net. (probably a mixture of two species that cannot be reliably separated by light microscopy).	number of individuals per 1000 cubic meters (#/1000 m^3)	abundance
Lop_fro_Adults	Abundance of Lophothrix frontalis (adults) in the net	number of individuals per 1000 cubic meters (#/1000 m^3)	abundance
Luc_fla_Adults	Abundance of Lucicutia flavicornis (adults) in the net	number of individuals per 1000 cubic meters (#/1000 m^3)	abundance
Luc_hul_Adults	Abundance of Lucicutia hulsemannae (adults) in the net	number of individuals per 1000 cubic meters (#/1000 m^3)	abundance
Luc_ova_Adults	Abundance of Lucicutia ovalis (adults) in the net	number of individuals per 1000 cubic meters (#/1000 m^3)	abundance
Mec_cla_Adults	Abundance of Mecynocera clausi (adults) in the net	number of individuals per 1000 cubic meters (#/1000 m^3)	abundance
Met_bre_Adults	Abundance of Metridia brevicauda (adults) in the net	number of individuals per 1000 cubic meters (#/1000 m^3)	abundance
Met_pri_Adults	Abundance of Metridia princeps (adults) in the net	number of individuals per 1000 cubic meters (#/1000 m^3)	abundance
Par_cal_Adults	Abundance of Paraeuchaeta californica (adults) in the net	number of individuals per 1000 cubic meters (#/1000 m^3)	abundance
Ple_abd_Adults	Abundance of Pleuromamma abdominalis (adults) in the net	number of individuals per 1000 cubic meters (#/1000 m^3)	abundance
Ple_joh_Adults	Abundance of Pleuromamma johnsoni (adults) in the net	number of individuals per 1000 cubic meters (#/1000 m^3)	abundance
Ple_qua_Adults	Abundance of Pleuromamma quadrungulata (adults) in the net	number of individuals per 1000 cubic meters (#/1000 m^3)	abundance
Sca_mag_Adults	Abundance of Scaphocalanus magnus (adults) in the net	number of individuals per 1000 cubic meters (#/1000 m^3)	abundance
Sub_sub_Adults	Abundance of Subeucalanus subtenuis (adults) in the net	number of individuals per 1000 cubic meters (#/1000 m^3)	abundance
Date_Local	Date (local) of MOCNESS tow; added from the cruise event log or MOCNESS event log; format: YYYY-MM-DD	unitless	date
Time_In_Local	Time (local) at start of MOCNESS deployment; added from the cruise event log or MOCNESS event log; format: hhmm	unitless	time
Time_Out_Local	Time (local) of end of MOCNESS deployment; added from the cruise event log or MOCNESS event log; format: hhmm	unitless	time
Lat_In	Latitude at start of MOCNESS deployment; added from the cruise event log or MOCNESS event log	decimal degrees North	lat
Lon_In	Longitude at start of MOCNESS deployment; added from the cruise event log or MOCNESS event log	decimal degrees East	lon
Lat_Out	Latitude at end of MOCNESS deployment; added from the cruise event log or MOCNESS event log	decimal degrees North	lat
Lon_Out	Longitude at end of MOCNESS deployment; added from the cruise event log or MOCNESS event log	decimal degrees East	lon
Day_Night	Designates if the cast was during the day (D) or night (N); added from the cruise event log or MOCNESS event log	unitless	time_of_day
In_ISO_DateTime_UTC	Date and time (UTC) at start of MOCNESS deployment in ISO8601 format: YYYY-MM-DDThh:mmZ	unitless	ISO_DateTime_UTC
Out_ISO_DateTime_UTC	Date and time (UTC) at end of MOCNESS deployment in ISO8601 format: YYYY-MM-DDThh:mmZ	unitless	ISO_DateTime_UTC
local_time_zone	Local time zone represented as number of hours offset from UTC	unitless	time_zone

Database

Contribute Data

Dataset: Copepod Abundances in MOCNESS tows
Deployment: SKQ201701S

Dataset acquisition description

Dataset Processing Description

Database

Contribute Data

Dataset: Copepod Abundances in MOCNESS towsDeployment: SKQ201701S

Dataset acquisition description

Dataset Processing Description

Dataset: Copepod Abundances in MOCNESS tows
Deployment: SKQ201701S