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OAS accession Detail for 0112172
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| accessions_id: | 0112172 | archive |
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| Title: | Zooplankton abundance and biomass from MOCNESS silhouettes, from the RVIB Nathaniel B. Palmer NBP0103, NBP0104 from the Southern Ocean, 2001-2002 (SOGLOBEC project, Southern Ocean Krill project) (NCEI Accession 0112172) |
| Abstract: | This dataset contains biological and survey - biological data collected on RVIB Nathaniel B. Palmer during cruises NBP0103 and NBP0104 in the South Atlantic Ocean, South Pacific Ocean, and Southern Ocean from 2001-04-29 to 2002-09-11. These data include abundance, biomass, depth_close, depth_open, and taxon. The instruments used to collect these data include MOCNESS1. These data were collected by Dr Carin J. Ashjian and Dr Peter H. Wiebe of Woods Hole Oceanographic Institution as part of the "GLOBEC: Winter Distribution and Success of Southern Ocean Krill (Southern Ocean Krill)" and "U.S. GLOBEC Southern Ocean (SOGLOBEC)" projects and "U.S. GLOBal ocean ECosystems dynamics (U.S. GLOBEC)" program. The Biological and Chemical Oceanography Data Management Office (BCO-DMO) submitted these data to NCEI on 2019-02-06. The following is the text of the dataset description provided by BCO-DMO: Zooplankton abundance + biomass from silhouettes, MOC nets, NBPalmer Dataset Description: Zooplankton abundance and biomass from MOCNESS nets using silhouette analysis NB Palmer, austral fall & winter of 2001 & 2002 Cruises: Nathaniel B. Palmer, April-June 2001 (NBP01-03), 24 tows Nathaniel B. Palmer, July-Sept. 2001 (NBP01-04), 17 tows Nathaniel B. Palmer, April-May 2002 (NBP02-02), 24 tows Nathaniel B. Palmer, July-Sept. 2002 (NBP02-04), 19 tows Related Datasets: Zooplankton biovolume values from MOCNESS tows - this dataset is derived from displacement volume measurements and dry weight conversion calculations from the same set of samples as the above data. https://www.bco-dmo.org/dataset/2372 Zooplankton Abundance Based on Taxa and Life Stages or Size - these abundance values on the same tows were derived by counting and identifying a subset of the zooplankton to the species and life stage for euphausiids and dominant copepods and to taxonomic group with broad size categories for other zooplankton (pteropod, chaetognath, polychaete, etc.). https://www.bco-dmo.org/dataset/2387 |
| Date received: | 20190206 |
| Start date: | 20010429 |
| End date: | 20020911 |
| Seanames: | South Atlantic Ocean, Southern Ocean, South Pacific Ocean |
| West boundary: | -75.732 |
| East boundary: | -65.529 |
| North boundary: | -65.147 |
| South boundary: | -69.243 |
| Observation types: | biological, survey - biological |
| Instrument types: | Multiple Opening/Closing Net and Environmental Sensing System (MOCNESS) |
| Datatypes: | DEPTH - OBSERVATION, species abundance, SPONGE SPECIES IDENTIFICATION, TAXONOMIC CODE |
| Submitter: | |
| Submitting institution: | Biological and Chemical Oceanography Data Management Office |
| Collecting institutions: | Woods Hole Oceanographic Institution |
| Contributing projects: | SO-GLOBEC, US GLOBEC |
| Platforms: | Nathaniel B. Palmer (3206) |
| Number of observations: | |
| Supplementary information: | Acquisition Description: The MOCNESS-1 plankton sampler has nine rectangular nets (1m x 1.4 m) with a mesh size of 0.333 mm, which are opened and closed sequentially by commands through conducting cable from the surface (Wiebe et al. , 1976). Biomass (wet weight) and abundance were determined principally by silhouette digitization of taxa lengths and conversion to equivalent wet weights according to the equations and methods adapted from Davis and Wiebe (1985) and Wiebe et al. (2004). New formulas were calculated for Southern Ocean krill because the length-weight relationship (Wet Weight = 0.0054*Length 3.214 ) differed from that of the North Atlantic euphausiids (Wet Weight = 0.0138*Length 3.071 ; Davis and Wiebe, 1985). MOCNESS Sample Analysis (from Ashjian et al., 2004) Silhouette photographs first were obtained from each sample; this photograph then was scanned with an Epson Expression 1600 scanner at 1200 dpi to produce a Tagged Image File Format (TIF) image. Identification and measurement of organisms from the tiff image were accomplished manually using the specialized MATLAB (Mathworks, Inc.) routine, the WHOI Silhouette DIGITIZER (v 1.0) (Little and Copley, 2003). A scanned photographic image of an aliquot of a sample was displayed with a superimposed reference grid on the computer screen. The operator identified each organism to taxonomic and/or size category by selecting the appropriate category button. Organism lengths (both straight and curved) then were measured by the operator using the cursor on the computer screen. Although the nominal resolution of the measurement is 0.02 mm, in practice the resolution was ~0.05 mm. In instances where there were too many organisms of a given type to justify measuring every individual organism, the DIGITIZER routine generated a list of randomly located cells to systematically sub-sample the overall image. Each organism's biomass was calculated automatically from its length measurement using the appropriate length-weight relationship. This is a graph of the vertical distribution of biomass from the Winter 2001 Cruise, NBP0103. Net 8 is closest to the surface and net 1 is deepest: This is a graph of the vertical distribution of biomass from the Winter 2001 Cruise, NBP0104: Figure 1. Map of Tow locations, Fall and Winter, 2001 Table 1. Summary of locations, times, and depths for the twelve net tows. ( Note: Winter tows 14 and 15 were considered one tow because when ice and malfunction led to no data in the top three nets of Tow 14, MOC Tow 15 was fished in the upper 90 meters to compensate.) Cruise Region Tow Number Date Time (Local) Light* Lat(S) Lon(W) Tow Depth(m) Bottom Depth(m) Ice Cover (tenths) Fall Offshore 6 05/04/01 1332 D 66 40.17 73 22.08 0-1001 3650 0 Midshelf 1 1 04/30/01 2050 N 66 10.80 69 10.47 0-306 360 0 Midshelf 2 3 05/02/01 0320 N 66 48.53 70 21.42 0-348 600 0 Midshelf 3 12 05/13/01 1830 N 68 23.62 72 18.44 0-356 400 0 Midshelf 4 16 05/18/01 0854 N 68 59.43 74 55.77 0-340 350 0 Marguerite Bay 24 05/29/01 0300 N 67 55.33 68 30.69 0-602 690 0 Winter Offshore 11 08/11/01 0918 T 67 14.69 74 25.27 0-989 2917 10 Midshelf 1 17 08/26/01 0306 N 66 11.13 69 06.21 7-305 346 6 Midshelf 2 4 07/31/01 0949 D 66 45.18 70 09.64 11-413 501 8 Midshelf 3 13 08/17/01 2117 N 68 13.21 72 56.53 0-230 325 10 Midshelf 4 14 08/21/01 1136 D 69 15.55 75 34.00 20-290 ~340 7 15 08/22/01 0327 N 69 12.30 75 43.90 0-91 ~350 9 Marguerite Bay 9 08/08/01 0215 N 67 53.74 68 10.82 0-488 600+ 9 * Light conditions are designated as: "D" = day, sunlight present; "N" = night, darkness; "T" = twilight In this accession, NCEI has archived multiple versions of these data. The latest (and best) version of these data has the largest version number. |
| Availability date: | |
| Metadata version: | 8 |
| Keydate: | 2013-08-19 19:21:49+00 |
| Editdate: | 2025-01-18 16:04:16+00 |