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OAS accession Detail for 0115259
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| accessions_id: | 0115259 | archive |
|---|---|
| Title: | Zooplankton counts for bongo net hauls in the Gulf of Alaska from F/V Great Pacific GP0401-01, GP0401-02 from October to November 2004 (NEP project) (NCEI Accession 0115259) |
| Abstract: | This dataset contains biological and survey - biological data collected on F/V Great Pacific during cruises GP0401-01 and GP0401-02 in the Gulf of Alaska and North Pacific Ocean from 2004-10-19 to 2004-11-18. These data include depth, sex, and taxon. The instruments used to collect these data include Bongo Net. These data were collected by Dr Edward D. Cokelet and Dr Edward V. Farley of National Oceanic and Atmospheric Administration and Dr Kenneth O Coyle and Seth L. Danielson of University of Alaska Fairbanks as part of the "U.S. GLOBEC Northeast Pacific (NEP)" project 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 2020-01-16. The following is the text of the dataset description provided by BCO-DMO: Zooplankton counts for bongo net hauls in the Gulf of Alaska during 2004 Dataset Description: Gulf of Alaska Bongo catch data Zooplankton counts for bongo net hauls in the Gulf of Alaska during 2004. Marine Ecosystem Monitoring in the Northern Gulf of Alaska web site GAK1 Time Series web site This project is to conduct the Gulf of Alaska Long-Term Observation Program (GOA-LTOP) as part of Phase II of the Northeast Pacific (NEP) GLOBEC program. The GOA shelf supports a rich ecosystem that includes many commercially important fisheries. The basis for this productivity is enigmatic for the GOA shelf is deep, forced by downwelling-favorable winds, and fed by a massive nutrient-poor coastal freshwater discharge. Both the winds and the freshwater discharge are intimately linked to the strength and position of the Aleutian Low. The GOA ecosystem experiences substantial physical and biological changes on decadal and interannual time scales. Although some of these changes are correlated with various climatic indices a mechanistic understanding of climate change and ecosystem response is unavailable. The generic goal of this LTOP is to understand and quantify temporal (seasonal and interannual) and spatial (cross- and along-shelf) variations in the thermohaline, chemical, and biological properties and relationships of this shelf. Our proposal supports GLOBEC goals that will help: 1) retrospective studies interpret historical data, 2) design a cost-effective long-term monitoring program, 3) provide the seasonal and interannual context for concurrent mesoscale and process studies, and 4) provide boundary conditions and data sets for model evaluation. This 5-year project entails 4 field years and a fifth year for data analyses and synthesis. The field effort involves seven, 9-day interdisciplinary cruises/year in the northern GOA. The study area encompasses the 220-km long, Seward Line (sampled in the 1970s) that extends across the shelf and slope and high resolution sampling of the Alaska Coastal Current (ACC), upstream, downstream, and within Prince William Sound. The ACC is an important shelf habitat for yoy salmon migrating from nursery areas in the sound and into the GOA. The sampling effort (Table A) is year-round and motivated by seasonally significant physical and biological events affecting yoy pink salmon. Table A. Sampling schedule and rationale for GOA-LTOP. (Key for Winds, Discharge and Stratification: S=strong; M=moderate; W=weak; D=downwelling winds; U=upwelling winds; V=variable; L=low; H=high) Deep water moves onshore during the July-August upwelling period. Month Sampling Physical Rationale Biological Rationale CTD Nutrients Zoo Fish Winds Disch Strat March X X X D S L W Zooplankton migrate from depth (at shelfbreak); transported inshore. April X X X D M L-M W V Phytoplankton bloom May X X X D M-W M M V Maximum oceanic copepod biomass. July X X X X D/U W M-H S Maximum zooplankton abundance; YOY salmon enter shelf. August X X X X D/U W M-H S Maximum YOY salmon abundance on shelf. October X X X X D S H H YOY salmon on shelf. December X X X D S M M Fall-winter pre-conditioning for spring nutrients, small zooplankton. The sampling protocol follows GLOBEC guidelines and uses gear types and techniques similar to those in the Oregon LTOP that is also a part of the NEP-GLOBEC program. Most of the research will be conducted from the R/V Alpha Helix . Fish sampling will be done from a chartered trawler in July, August, and October. Both vessels will work together during these cruises so that the fishing charter can verify fish targets detected on the acoustics array towed from the Alpha Helix . This page was last updated on September 22, 2000. Maintained by: College of Oceanic & Atmospheric Sciences Oregon State University Corvallis, OR 97331-5503 phone: 541-737-4500; FAX 541-737-2064 |
| Date received: | 20200116 |
| Start date: | 20041019 |
| End date: | 20041118 |
| Seanames: | Gulf of Alaska, North Pacific Ocean |
| West boundary: | -157.45 |
| East boundary: | -151.6 |
| North boundary: | 58.928 |
| South boundary: | 54.29 |
| Observation types: | biological, survey - biological |
| Instrument types: | net - plankton net |
| Datatypes: | DEPTH - OBSERVATION, SPECIES IDENTIFICATION - SEX, TAXONOMIC CODE |
| Submitter: | |
| Submitting institution: | Biological and Chemical Oceanography Data Management Office |
| Collecting institutions: | University of Alaska Fairbanks, US DOC; National Oceanic and Atmospheric Administration |
| Contributing projects: | US GLOBEC |
| Platforms: | Great Pacific (324J) |
| Number of observations: | |
| Supplementary information: | Acquisition Description: The OCC/GLOBEC survey occurred along the coastal waters of the Gulf of Alaska and in Shelikof Strait, AK during 2001-2004. Transects sampled during the survey were perpendicular to shore and extended from nearshore across the continental shelf to oceanic waters beyond the 200-m shelf break. The survey was conducted aboard the contract fishing vessel F/V Great Pacific during 2001-2002 and 2004, and aboard NOAA Ship Miller Freeman during 2003. Fish samples were collected in a 198-m long mid-water rope trawl with hexagonal mesh wings and body, and a 1.2-cm mesh liner in the codend. The rope trawl was towed at 6.5 to 9.3 km • hour-1, at or near surface, and had a typical spread of 40-m horizontally and 15-m vertically. All tows lasted 30 minutes and covered 2.8 to 4.6 km, and sampling was done during daylight hours; however, tows occurred during night as part of a 24-hour repeat sampling of a single station for one day during 2001 and 2003. Once the net was hauled aboard, salmon and other fishes were sorted by species and counted. Standard biological measurements including fork length, body weight, and sex were taken from sub-samples of all salmon species. Sub-samples of juvenile pink ( Oncorhynchus gorbuscha ), chum ( O. keta ), and sockeye ( O. nerka ) salmon were frozen whole for laboratory analyses of food habits, otolith hatchery thermal marks (pink and chum salmon), and genetic analysis (chum salmon). Plankton samples were collected using a 1-m2 Tucker trawl fitted with a 505-um mesh net that was towed near surface (approximately 1 knot) for 5 minutes (2001-2003 surveys). During 2004, plankton samples were collected using a WP-2 net fitted with a 253-um mesh net that was deployed vertically to a depth of 100-m depth. The volume of water filtered by the net was estimated using flow meters. Plankton samples were transferred into vials, preserved in 5% formalin onboard the ship, and stored until a laboratory analysis was completed. 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: | 5 |
| Keydate: | 2013-12-23 19:00:05+00 |
| Editdate: | 2023-05-04 04:15:57+00 |