AE1918 was a cruise of opportunity on which two oceanographic sampling activities were conducted: a CTD cast and a MOCNESS net tow. These are the continuous underway data from the MOCNESS tow.

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Archival Copy

Version Date	Archive	Persistent Identifier	Date Assigned
2019-11-13	Marine Biological Laboratory/Woods Hole Oceanographic Institution Library (MBLWHOI DLA)	10.1575/1912/bco-dmo.781545.1	2019-12-02

Description

AE1918 was a cruise of opportunity on which two oceanographic sampling activities were conducted: a CTD cast and a MOCNESS net tow. These are the continuous underway data from the MOCNESS tow.

Methods & Sampling

Standard MOCNESS procedure. It was observed filtered volumes to be too high (and speeds too high), so flowmeter was "recalibrated" using deployments and files reanalyzed. It is likely that, since the flowmeter was too new, after several recent deployments has finally "broken-in" and now goes faster. Flow calibration was done by running the LVpki software for several profiles looking at average CF values.

Refer to the cruise report for more information. See also: the xmlcon and hdr files under Supplemental Files.

Data Processing Description

Data Processing: Data from the net files was extracted using SBEDataProcessing software. See Supplemental Files for raw data.

Problem Report: The mentioned problem with flow counts.

BCO-DMO Processing:
- added date/time and tow information from file header;
- added ISO-DateTime field.

Data Files

File
AE1918_MOC_continuous.csv (Comma Separated Values (.csv), 930.30 KB) MD5:0f1687c6a44a3e8de0c0a21b2cb77715 Primary data file for dataset ID 781545

Supplemental Files

File
AE1918 CTD MOCNESS .bl file filename: Tow1_01.bl (Plain Text, 448 bytes) MD5:1919641c5c9abca44adeca9c13644202 AE1918 CTD MOCNESS .bl file (summary for each net)
AE1918 CTD MOCNESS .hdr file filename: Tow1_01.hdr (Plain Text, 960 bytes) MD5:9ee25de59a4fb13d061dba4c8cc0d643 AE1918 CTD MOCNESS .hdr file
AE1918 CTD MOCNESS .hex file (raw data) filename: Tow1_01.hex (Plain Text, 8.47 MB) MD5:85ebae9ad691f24b49ad025a2dedefd7 AE1918 CTD MOCNESS .hex file (raw data)
AE1918 CTD MOCNESS .mcn file filename: Tow1_01.mcn (Plain Text, 841.83 KB) MD5:c21edba06448edca90c45f6454d29e4e AE1918 CTD MOCNESS .mcn file
AE1918 CTD MOCNESS XMLCON file filename: MOCNESS_CONFIG_0470_4June2019.xmlcon (Plain Text, 4.87 KB) MD5:a9188ec26bea98c1177c6c1081fe5f78 AE1918 CTD MOCNESS XMLCON file

More Information about this dataset

Funding Sources

Funding Source	Award Number
NSF Division of Ocean Sciences	OCE-1829318
NSF Division of Ocean Sciences	OCE-1829378

Deployments

Deployment	Synonyms	Start Date	Platform	Investigator
AE1918		2019-07-25	R/V Atlantic Explorer	Leocadio Blanco-Bercial (Chief Scientist)	data info

Instruments

MOCNESS1

Supplied Name: MOCNESS

Supplied Description:

Seabird 9/11 unit attached to a 1 m MOCNESS, 150 micron mesh nets

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

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

Supplied Name	Supplied description	Supplied Units	Standard Name
tow	Tow number (based on file name)	unitless	tow
date_start	Date UTC at start of tow (from file header); format: yyyy-mm-dd	unitless	date
time_start	Time UTC at start of tow (from file header); format: hh:mm:ss	unitless	time
ISO_DateTime_UTC_start	Date and time (UTC) at start of tow formatted ISO8601 standard: yyyy-mm-ddTHH:MM:SS	unitless	ISO_DateTime_UTC
cruise	Cruise identifier	unitless	cruise_id
time	Decimal day of year	unitless	time
pres	Pressure	decibars (dbar)	press
temp	Temperature of the water	degrees Celsius	temp
theta	Sigma-theta (density) of the water	kilograms per cubic meter (Kg m-3)	sigma_0
sal	Salinity of the water	PSU	sal
sigma	Sigma (density) of the water	kilograms per cubic meter (Kg m-3)	sigma_0
angle	Angle of the net	degrees	angle
flow	Flow counts of the net	counts	flow
hzvel	Horizontal velocity	meters per second (m s-1)	hzvel
vtvel	Vertical velocity	meters per second (m s-1)	vtvel
vol	Volume filtered in that net	cubmic meters (m3)	vol_filt
net	Net number	unitless	net
lat	Latitude	degrees North	lat
lon	Longitude	degrees East	lon
GPSTIME	GPS time	unitless	time
CTDDEPTH	Depth	meters (m)	depth