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OAS accession Detail for 0288302
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| accessions_id: | 0288302 | archive |
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| Title: | Abundance and size distribution of abandoned (ghost) Phaeocystis colonies from profiles conducted during R/V Polar Star cruises in the Ross Sea, Antarctica between 2001 and 2005 (NCEI Accession 0288302) |
| Abstract: | This dataset contains data collected on USCGC Polar Star during cruise IVARS_cruises in the South Pacific Ocean and Southern Ocean from 2001-12-20 to 2005-02-01. These data include depth. The instruments used to collect these data include CTD Sea-Bird SEACAT, Camera, and Sea Tech Transmissometer. These data were collected by Dr Vernon L. Asper of University of Southern Mississippi and Walker O. Smith of Virginia Institute of Marine Science as part of the "Interannual Variability in the Antarctic-Ross Sea (IVARS): Nutrients and Seasonal Production (IVARS)" project. The Biological and Chemical Oceanography Data Management Office (BCO-DMO) submitted these data to NCEI on 2019-06-12. The following is the text of the dataset description provided by BCO-DMO: Profile of the abundance and size distribution of abandoned (ghost) Phaeocystis colonines Dataset Description: Abundance and size distribution of abandoned (ghost) Phaeocystis colonies from profiles conducted during R/V Polar Star cruises in the Ross Sea, Antarctica between 2001 and 2005. Related dataset (collected during the same profiles): IVARS Marine Snow Profiles: https://www.bco-dmo.org/dataset/719478 |
| Date received: | 20190612 |
| Start date: | 20011220 |
| End date: | 20050201 |
| Seanames: | Southern Ocean, South Pacific Ocean |
| West boundary: | 171.067 |
| East boundary: | 172.8 |
| North boundary: | -76.409 |
| South boundary: | -77 |
| Observation types: | |
| Instrument types: | camera, CTD, transmissometer |
| Datatypes: | DEPTH - OBSERVATION |
| Submitter: | |
| Submitting institution: | Biological and Chemical Oceanography Data Management Office |
| Collecting institutions: | The University of Southern Mississippi, Virginia Institute of Marine Science |
| Contributing projects: | |
| Platforms: | Polar Star (32PZ) |
| Number of observations: | |
| Supplementary information: | Acquisition Description: Methodology: A marine snow imaging system was lowered through the water column to acquire photographs of aggregates but these images also included abandoned (ghost) Phaeocystis colonies that are enumerated in this data set. The imaging system consisted of a collimated strobe system and either a 35-mm film camera (Lobsiger Deepslope 6000; Years 1 - 3) or a digital camera (Insite Pacific Scorpio; Year 4) mounted on an aluminum frame. The system was lowered at a rate of 10 m min-1 through the water column, acquiring ca. six images min-1 at an interval of ca. 1.7 m throughout the entire water column. Illumination was provided by a pair of strobe lights (Deep Sea Power and Light) positioned to produce an 8.4-cm deep beam of uniform, collimated light 66 or 79 cm from the camera lens. Aggregates larger than 0.5 mm within this volume (3 - 15 L, depending on the camera, lens and resultant geometry) are quantified from images taken by a camera that is mounted perpendicular to the long axis of the light beam, which can subsequently be distinguished and quantified by digital analysis. Ambient light illuminates particles in front of and behind this light beam and invalidates the calculation of illuminated volume. Thus, profiles were obtained near local midnight whenever possible (24-h photoperiods occurred throughout all cruises) to minimize this interference; images with the frame visible, due to ambient light, were discarded. The depth of first aggregate counts ranged from 30 - 88 m (a function of water clarity and solar angle). A Sea-Bird SeaCat CTD and 25-cm SeaTech transmissometer mounted on the camera frame provided continuous measurements of temperature, salinity and optical transmission. These data were used to calculate the depth at which each image was acquired. All film (Tmax 400) and images were returned to the laboratory for processing except for short sections viewed at sea to assess camera operation. The films were developed and then digitized to JPG format either in house, using a Nikon camera and macro lens (3767 x 2368), or commercially (3544 x 2341). |
| Availability date: | |
| Metadata version: | 1 |
| Keydate: | 2024-02-02 15:01:25+00 |
| Editdate: | 2024-02-02 15:02:28+00 |