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OAS accession Detail for 0113956
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| accessions_id: | 0113956 | archive |
|---|---|
| Title: | AK-LTOP MOCNESS tow zooplankton abundance and biomass from R/V Alpha Helix, R/V Wecoma multiple cruises in the Northeast Pacific from 1997-2004 (NEP project) (NCEI Accession 0113956) |
| Abstract: | This dataset contains biological and survey - biological data collected on R/V Alpha Helix and R/V Wecoma during cruises HX201, HX203, HX205, HX208, HX211, HX215, HX217, HX218, HX219, HX223, HX225, HX228, HX230, HX231, HX234, HX237, HX239, HX241, HX243, HX246, HX248, HX252, HX254, HX257, HX258, HX262, HX263, HX267, HX269, HX270, HX272, HX276, HX279, HX281, HX283, HX286, HX292, and W0307A in the Gulf of Alaska from 1997-10-13 to 2004-10-08. These data include abundance, biomass, depth, species, stage, and taxon_code. The instruments used to collect these data include MOCNESS1. These data were collected by Dr Kenneth O Coyle 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 2023-01-23. The following is the text of the dataset description provided by BCO-DMO: AK-LTOP MOCNESS tow zooplankton abundance/biomass Dataset Description: MOCNESS catch data - zooplankton species abundance and biomass, 1997 - 2004 updated July 2008 All data are for 1 meter-square nets, 5 mm mesh, oblique hauls. |
| Date received: | 20230123 |
| Start date: | 19971013 |
| End date: | 20041008 |
| Seanames: | Gulf of Alaska |
| West boundary: | -149.491 |
| East boundary: | -144.16 |
| North boundary: | 60.797 |
| South boundary: | 58.046 |
| Observation types: | biological, survey - biological |
| Instrument types: | Multiple Opening/Closing Net and Environmental Sensing System (MOCNESS) |
| Datatypes: | DEPTH - OBSERVATION, species abundance, SPECIES IDENTIFICATION, SPECIES IDENTIFICATION - LIFE STAGE, SPONGE SPECIES IDENTIFICATION, TAXONOMIC CODE |
| Submitter: | |
| Submitting institution: | Biological and Chemical Oceanography Data Management Office |
| Collecting institutions: | University of Alaska Fairbanks |
| Contributing projects: | US GLOBEC |
| Platforms: | Alpha Helix (31HX), WECOMA (32WC) |
| Number of observations: | |
| Supplementary information: | Acquisition Description: GLOBEC 2000: Gulf of Alaska Long-Term Observation Program T. Weingartner, L. Haldorson, R. Hopcroft, K. Coyle, T. E. Whitledge (all at University of Alaska, Fairbanks), T. Royer (Old Dominion University) 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 followed GLOBEC guidelines and used gear types and techniques similar to those in the Oregon LTOP that was also a part of the NEP-GLOBEC program. Most of the research was conducted from R/V Alpha Helix . Fish sampling was done from a chartered trawler in July, August, and October. Both vessels worked together during these cruises so that the fishing charter could verify fish targets detected on the acoustics array towed from the Alpha Helix . This information was last updated on September 22, 2000. 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: | 2013-10-29 13:45:06+00 |
| Editdate: | 2025-01-18 16:11:14+00 |