The MOCNESS is based on the Tucker Trawl principle (Tucker, 1951). 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). In MOCNESS 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 flowmeter 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, depending on the particular configuration of the MOCNESS-1, data may have been collected from other sensors attached to the frame : (Transmissometer, Fluorometer, Downwelling light sensor, and the Oxygen sensor). A SeaBird underwater pump was also included in the sensor suite.
U.S. GLOBEC Northeast Pacific California Current Program MOCNESS Plankton (MOC1) Data
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Data Collections were done as part of several projects.
\nContact for this dataset is:
\nDr. William Peterson (bill.peterson@noaa.gov)
\nPhone: 541-867-0201
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All inquiries about this data should be directed to Dr. Peterson.
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Data Description
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The MOC1 data are organized by cruise within year. The master page (Level 0) lists all of the cruises in chronological order. Clicking on a cruise will show all of the casts collected/processes from that cruise (Level 1). Clicking on a cast will bring up the Level 2 file that shows all of the samples (nets) processed from that cast. Clicking on the sample_id (ranges from \"1\" to \"8\" for this type of data) will display the Level 3 data, which are the actual taxonomic categories and abundances for that particular sample. Additional info about the variables is described below.
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\n\n\n| Program Codes | \nDescription | \n
\n\n| LTOP | \nsamples collected on Long-term Observation Program Cruises (ca. 4-6 cruises per year; all sample the Newport Hydrographic (NH) Line; some sample other standard lines further south) | \n
\n\n| MESO_1 | \nsamples collected from process cruise in June 2000 | \n
\n\n| MESO_2 | \nsamples collected from process cruise in August 2000 | \n
\n\n| MESO_3 | \nsamples collected from process cruise in June 2002 | \n
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\n\n\nLife Stage Info Codes
\n\t\t\t(partial listing) | \nDescription | \n
\n\n| most are self-explanatory; Male, Female, CV ==> Copepodite 5, Zoea, Nauplii, N2 => Nauplius 2, Egg--a few are not, esp. for the euphausiids (Thysanoessa and Euphausia) | \n
\n\n| F2 | \nSecond Stage Furcilia (aka Furcilia 2) | \n
\n\n| F3 | \nThird Stage Furcilia (aka Furcilia 3) | \n
\n\n| F1_0 | \nFirst Stage Furcilia with 0 legs | \n
\n\n| F2_32 or Furcilia_2_3L2S | \nSecond Stage Furcilia with 3 pairs of legs total, with 2 pairs of legs having setae; this xLyS pattern is common, with x and y varying depending on stage of development | \n
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\n\n\n| MOCNESS Sample Analysis Protocols from \"comments\" field | \n
\n\n| Comment | \nDescription | \n
\n\n| Proc_Protocol=0 | \n(Standard Protocol): 1) Count, sex, measure, and stage all euphausiid species. 2) Count and measure Limacina pteropods 3) Count, stage, and measure both spp. of Neocalanus 4) Count and measure \"Big Stuff\" (large zooplankton, i.e., fish larvae, squid, octopi, jellies, other shrimp, etc...) | \n
\n\n| Proc_Protocol=1 | \n(Euphausiids only Protocol): 1) Count, sex, measure, and stage all euphausiids. | \n
\n\n| Proc_Protocol=2 | \n('Acoustic Calibrations' Protocol): 1) Count, sex, and measure all euphausiids (Adults and juveniles ONLY). 2) Count and measure Limacina pteropods. | \n
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Metadata last updated 29 May 2012;smr, BCO-DMO
After retrieval to deck, the contents of the nets were rinsed into the codends and transferred to storage bottles, and fixed and preserved with formalin. In the shore laboratory, the contents of the bottles were subsampled and counts and biomass estimates made for selected taxa (see the Proc_Protocol info below). This data object reports only the count information.