EK60 Water Column Sonar Data Collected During DY1506
Gulf of Alaska Acoustic-Trawl Survey of Walleye Pollock (DY1506, EK60). The Midwater
Assessment and Conservation Engineering (MACE) program of NOAA National Marine Fisheries
Service (NMFS), Alaska Fisheries Science Center (AFSC) conducted an acoustic-trawl
(AT) stock assessment survey in the Gulf of Alaska (GOA) during late spring/summer
of 2015 to estimate the distribution and abundance of walleye pollock (Gadus chalcogrammus).
The survey area included the GOA shelf from the Islands of Four Mountains to Chiniak
Trough including many associated bays and troughs. The survey was conducted from June
11 to August 16, 2015 in three legs, starting and ending in Kodiak, Alaska, with intermediate
port calls in Kodiak, Alaska. The survey was conducted aboard NOAA Ship Oscar Dyson,
a 64 meter stern trawler equipped with acoustic and oceanographic instrumentation.
The primary instrumentation for the survey was a Simrad EK60 split-beam echosounder
system utilizing five frequencies (18, 38, 70, 120, and 200 kHz).
- Cite as: Alaska Fisheries Science Center. 2015. 'EK60 Water Column Sonar Data Collected During DY1506'. NOAA National Centers for Environmental Information. doi:10.7289/V5MS3QQV [access date]
- DY1506_EK60
- doi:10.7289/V5MS3QQV
- NCEI Metadata ID:gov.noaa.ngdc.mgg.wcd:DY1506_EK60
gov.noaa.ngdc.mgg.wcd:DY1506_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 | 2015-06-11T14:28:53 to 2015-08-16T00:00:00 |
Spatial Reference System | urn:ogc:def:crs:EPSG::4326Vertical Datum: Unknown |
Spatial Bounding Box Coordinates |
West:-170.036986042604
East:-139.636695858121
South:52.3829560358483
North:60.8975332580642
|
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) survey of walleye pollock (Gadus chalcogrammus) in the Gulf of Alaska |
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 the 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