EK60 Water Column Sonar Data Collected During DY1702
Acoustic-Trawl Surveys of Walleye Pollock in the Gulf of Alaska (DY1702, EK60). The
Midwater Assessment and Conservation Engineering (MACE) program of NOAA Fisheries,
Alaska Fisheries Science Center (AFSC) conducted acoustic-trawl (AT) stock assessment
surveys in the Gulf of Alaska (GOA) during the winter and early spring of 2017 to
estimate the distribution and abundance of walleye pollock (Gadus chalcogrammus).
These surveys were conducted aboard NOAA Ship Oscar Dyson, a 64 meter stern trawler
equipped with acoustic and oceanographic instrumentation. The primary instrument for
the surveys was a Simrad EK60 split-beam echosounder system utilizing five frequencies
(18, 38, 70, 120, and 200 kHz). The vessel departed Kodiak, Alaska on 1 March and
conducted the Kenai Bays survey (including Port Dick, Nuka Passage, Harris Bay, Aialik
Bay, Resurrection Bay, Day Harbor, and Port Bainbridge) 2-5 March. The Prince William
Sound, Hinchinbrook Trough and Middleton Island surveys were conducted 5-9 March.
A calibration of the echosounder system was conducted during the previous cruise on
14 February in Volcano Bay, Alaska. The vessel arrived at its homeport of Kodiak,
Alaska on 10 March, 2017.
- Cite as: Alaska Fisheries Science Center. 2017. 'EK60 Water Column Sonar Data Collected During DY1702'. NOAA National Centers for Environmental Information. doi:10.7289/V5MS3R19 [access date]
- DY1702_EK60
- doi:10.7289/V5MS3R19
- NCEI Metadata ID:gov.noaa.ngdc.mgg.wcd:DY1702_EK60
gov.noaa.ngdc.mgg.wcd:DY1702_EK60
Search Data |
|
Distribution Formats |
|
Ordering Instructions | Contact the NCEI Water Column Sonar Data Manager to order data. |
Distributor | NOAA National Centers for Environmental Information ncei.info@noaa.gov |
Dataset Point of Contact | NOAA National Centers for Environmental Information ncei.info@noaa.gov |
Dataset Point of Contact | Water Column Sonar Data Manager NOAA National Centers for Environmental Information (303) 497-4742 wcd.info@noaa.gov |
Time Period | 2017-02-28T18:45:01 to 2017-03-10T18:14:39 |
Spatial Reference System | urn:ogc:def:crs:EPSG::4326Vertical Datum: Unknown |
Spatial Bounding Box Coordinates |
West:-152.45287
East:-145.77491
South:57.72429
North:60.86886
|
Spatial Coverage Map |
General Documentation |
|
Associated Resources |
|
Publication Dates |
|
Dataset Progress Status | Complete - production of the data has been completed |
Data Update Frequency | Not planned |
Purpose | Acoustic-trawl (AT) surveys of walleye pollock (Gadus chalcogrammus) in the Kenai Bays and Prince William Sound areas of the Gulf of Alaska, 1-10 March, 2017. |
Use Limitations |
|
Dataset Citation |
|
Cited Authors |
|
Principal Investigators |
|
Custodians |
|
Publishers |
|
Theme keywords | Global Change Master Directory (GCMD) Science Keywords
|
Data Center keywords | Global Change Master Directory (GCMD) Data Center Keywords
|
Instrument keywords | Global Change Master Directory (GCMD) Instrument Keywords
|
Place keywords | International Hydrographic Organization (IHO) Sea Area ("Limits of Oceans and Seas"
publication S-23)
|
Use Constraints |
|
Access Constraints |
|
Fees |
|
Processor |
|
Lineage Statement | The EK60 transducers installed on NOAA Ship Oscar Dyson are mounted on a deployable centerboard. The transducer draft settings in the EK60 software are nominally correct when the centerboard is fully extended (draft correction setting is 9.15 meters below the surface). When the centerboard is in the retracted position (transducers approximately flush with the vessel's keel), the transducers are nominally 6.1 meters below the surface. |
Instrument |
|
Platform |
|
Operation |
|
Last Modified: 2020-06-03
For questions about the information on this page, please email:ncei.info@noaa.gov