<div><p>The MOCNESS is based on the Tucker Trawl principle (Tucker, 1951). The particular MOCNESS system from which these CTD data came is one of two net systems. The MOCNESS-1 has nine rectangular nets (1m x 1.4 m) which are opened and closed sequentially by commands through conducting cable from the surface (Wiebe et al., 1976). The MOCNESS-10 (with 10 m2 nets)carries 6 nets of 3.0-mm circular mesh. In both systems, 'the underwater unit sends a data frame, comprised of 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... Temperature (to approximately 0.01 deg C) and conductivity are measured with SEABIRD sensors. Normally, a modified T.S.K.-flowmeter is used... Both the temperature and conductivity sensors and the flow meter are mounted on top of the frame so that they face horizontally when the frame is at a towing angle of 45deg... Calculations of salinity (to approximately 0.01 o/oo S), potential temperature (theta), potential density (sigma), the oblique and vertical velocities of the net, and the approximate volume filtered by each net are made after each string of data has been received by the computer.' (Wiebe et al., 1985) In addition, data were collected from four other sensors attached to the frame: the Transmissometer, the Fluorometer, the Down welling light sensor, and the Oxygen sensor. A SeaBird underwater pump was also included in the sensor suite.</p></div>
CTD data collected during MOCNESS hauls
<div><h2>CTD observations taken simultaneously during MOCNESS tows,<br />
plus MOCNESS sampling conditions</h2>
<p><strong>Note:</strong> Some variables have been eliminated from the display but are nevertheless available. These variables include: oxycurrent, oxytemp, tempco, and echo.</p>
<p>The MOCNESS is based on the Tucker Trawl principle (Tucker, 1951). The particular MOCNESS system from which these CTD data came is one of two net systems. The MOCNESS-1 has nine rectangular nets (1m x 1.4 m) which are opened and closed sequentially by commands through conducting cable from the surface (Wiebe <em>et al.</em>, 1976). The MOCNESS-10 (with 10 m<sup>2</sup> nets)carries 6 nets of 3.0-mm circular mesh. In both systems, "the underwater unit sends a data frame, comprised of 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... Temperature (to approximately 0.01 deg C) and conductivity are measured with SEABIRD sensors. Normally, a modified T.S.K.-flowmeter is used... Both the temperature and conductivity sensors and the flow meter are mounted on top of the frame so that they face horizontally when the frame is at a towing angle of 45deg... Calculations of salinity (to approximately 0.01 o/oo S), potential temperature (theta), potential density (sigma), the oblique and vertical velocities of the net, and the approximate volume filtered by each net are made after each string of data has been received by the computer." (Wiebe <em>et al.</em>, 1985) In addition, data were collected from four other sensors attached to the frame: the Transmissometer, the Fluorometer, the Down welling light sensor, and the Oxygen sensor. A SeaBird underwater pump was also included in the sensor suite.</p>
<p>It should be noted that due to Antarctic cold, the first few minutes of data are often of questionable value as they are extremely variable and have a high frequency of '50.000' (indicating 'bad values') in the temp, theta and sal fields. Once the sensors encounter deeper, warmer water, they start recording good values.</p>
<p>For additional information, contact the <a href="http://usjgofs.whoi.edu/jg/serv/globec/soglobec/inventory.html0?project,name_prin"> chief scientist</a> for the cruise.</p>
<p> </p>
<h2>References</h2>
<p>¹Fofonoff and Millard, 1983, UNESCO technical papers in Marine Sciences, #44</p>
<p>Tucker, G.H., 1951. Relation of fishes and other organisms to the scattering of underwater sound. <em> Journal of Marine Research</em>, <strong>10:</strong> 215-238.</p>
<p>Wiebe, P.H., K.H. Burt, S. H. Boyd, A.W. Morton, 1976. The multiple opening/closing net and environmental sensing system for sampling zooplankton. <em>Journal of Marine Research</em>, <strong>34(3):</strong> 313-326</p>
<p>Wiebe, P.H., A.W. Morton, A.M. Bradley, R.H. Backus, J.E. Craddock, V. Barber, T.J. Cowles and G.R. Flierl, 1985. New developments in the MOCNESS, an apparatus for sampling zooplankton and micronekton. <em>Marine Biology</em>, <strong>87:</strong> 313-323.</p>
<p><em>last updated January 10, 2006; gfh</em></p></div>
CTD_MOCNESS10
<div><p>It should be noted that due to Antarctic cold, the first few minutes of data are often of questionable value as they are extremely variable and have a high frequency of '50.000' (indicating 'bad values') in the temp, theta and sal fields. Once the sensors encounter deeper, warmer water, they start recording good values.</p>
<p>For additional information, contact the <a href="/jg/serv/globec/soglobec/inventory.html0?project,name_prin"> chief scientist</a> for the cruise.</p></div>
2388
CTD_MOCNESS10
2009-11-25T11:56:52-05:00
2009-11-25T11:56:52-05:00
2023-07-07T16:10:26-04:00
urn:bcodmo:dataset:2388
CTD data collected during MOCNESS hauls from ARSV Laurence M. Gould and RVIB Nathaniel B. Palmer cruises LMG0203, NBP0104,and NBP0204 in the Southern Ocean from 2001-2002 (SOGLOBEC project)
CTD data collected during MOCNESS hauls from ARSV Laurence M. Gould and RVIB Nathaniel B. Palmer cruises LMG0203, NBP0104,and NBP0204 in the Southern Ocean from 2001-2002 (SOGLOBEC project)
false
Torres, J., Wiebe, P. (2001) CTD data collected during MOCNESS hauls from ARSV Laurence M. Gould and RVIB Nathaniel B. Palmer cruises LMG0203, NBP0104,and NBP0204 in the Southern Ocean from 2001-2002 (SOGLOBEC project). Biological and Chemical Oceanography Data Management Office (BCO-DMO). (Version 1) Version Date 2001-12-03 [if applicable, indicate subset used]. doi:10.1575/1912/bco-dmo.2388.1 [access date]
true
1
10.1575/1912/bco-dmo.2388.1
false
2001-12-03
Datapackage.json
Frictionless Data Package
https://www.bco-dmo.org/dataset/2388/datapackage.json
application/vnd.datapackage+json
PDF
https://www.bco-dmo.org/dataset/2388/Dataset_description.pdf
application/pdf
ISO 19115-2 (NOAA Profile)
https://www.bco-dmo.org/dataset/2388/iso
application/xml
http://www.isotc211.org/2005/gmd-noaa
Dublin Core
https://www.bco-dmo.org/dataset/2388/dublin-core
application/xml
http://purl.org/dc/elements/1.1/
2388
http://lod.bco-dmo.org/id/dataset/2388
2001-04-30 - 2002-09-11
2001-04-30
2001-04-30
---30
119
--04
2001
2002-09-11
2002-09-11
---11
253
--09
2002
OSPREY
http://www.opengis.net/def/crs/OGC/1.3/CRS84
<http://www.opengis.net/def/crs/OGC/1.3/CRS84> POLYGON((-77.0803 -69.7085, -64.1496 -69.7085, -64.1496 -69.7085, -64.1496 33.064, -77.0803 33.064, -77.0803 -69.7085))
-77.0803
-69.7085
-64.1496
33.064
-18.322250000000
-70.614950000000
VIEW TABLE
https://erddap.bco-dmo.org/erddap/tabledap/bcodmo_dataset_2388.htmlTable
text/html
SUBSET DATA
https://erddap.bco-dmo.org/erddap/tabledap/bcodmo_dataset_2388.html
text/html
CSV
https://erddap.bco-dmo.org/erddap/tabledap/bcodmo_dataset_2388.csv
text/csv
TSV
https://erddap.bco-dmo.org/erddap/tabledap/bcodmo_dataset_2388.tsv
text/tsv
GeoJSON
https://erddap.bco-dmo.org/erddap/tabledap/bcodmo_dataset_2388.geoJson
application/geo+json
MATLAB
https://erddap.bco-dmo.org/erddap/tabledap/bcodmo_dataset_2388.mat
text/x-matlab
netCDF
https://erddap.bco-dmo.org/erddap/tabledap/bcodmo_dataset_2388.nc
application/x-netcdf