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Inverted echo sounder measurements collected in the Japan/East Sea, from 1999-06-08 to 2001-07-25, under the sponsorship of the Office of Naval Research (NCEI Accession 0002331)
Observations were conducted from June 1999 to July 2001 to study the shallow and deep current variability in the southwest Japan/East Sea. Data were collected during the field experiment with a two-dimensional array of pressure-gauge equipped inverted echo sounders (PIES) and deep recording current meters (RCM). Hourly measurements of vertical acoustic travel time, pressure, temperature and horizontal currents are provided. Additional processing has been done to provide data sets which can easily be used together as a coherent array. The travel time records have been projected on to a common depth level, low-pass filtered, and subsampled to twice daily. The low-pass filtered, subsampled pressures have been adjusted to a common, deep geopotential surface. Small gaps in the current measurements have been replaced by fitted-spline interpolated values.
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EK80 Water Column Sonar Data Collected During DAFT1-C11-201701 Deployment
공공데이터포털
A bottom-moored echosounder was deployed at 47.15 m depth in the NE Chukchi Sea (70.0136N, 166.85755W) from 08 August 2017 to 11 August 2018. The mooring was instrumented with a battery-powered EK80 wideband autonomous transceiver (WBAT, Simrad AS). The echosounder operated an upwards facing depth-rated 70 kHz 18° split-beam transducer (ES70-18CD), positioned upward with a two-axis gimbal equipped with a 0.7 kg counterweight. The echosounder also operated a combined 38 kHz 18° split-beam and 200 kHz 18° single-beam (ES38-18/200-18C) mounted at a fixed position. Both transducer faces were positioned at a height of 0.8 m above the seafloor. During the deployment, the WBAT was programmed to transmit an ensemble of 300 pings (200 pings at 70 kHz, 100 pings at 38 and 200 kHz) during an ~3-minute wake up every two hours. Data were recorded to a range of 60 m. Echosounders were calibrated in Seattle, Washington prior to deployment using a 38.1-mm tungsten carbide sphere following the standard sphere method (Demer et al., 2015).
EK80 Water Column Sonar Data Collected During DAFT4-C11-201801 Deployment
공공데이터포털
A bottom moored echosounder was deployed at 47.15 m depth in the NE Chukchi Sea (70.0130N, 166.856233W) from 12 August 2018 to 26 August 2019. The mooring was instrumented with a battery powered EK80 wideband autonomous transceiver (WBAT, Simrad AS). The echosounder operated an upwards facing depth-rated 70 kHz 18° split-beam transducer (ES70-18CD), positioned upward with a two-axis gimbal equipped with a 0.7 kg counterweight. The echosounder also operated a combined 38 kHz 18° split-beam and 200 kHz 18° single-beam (ES38-18/200-18C) mounted at a fixed position. Both transducer faces were positioned at a height of 0.8 m above the seafloor. During the deployment, the WBAT was programmed to transmit an ensemble of 300 narrowband (200 pings at 70 kHz, 100 pings at 38 and 200 kHz) and 50 wideband (25 pings at 70 kHz, 25 pings at 38 and 200 kHz) every two hours. Data were recorded to a range of 60 m. This instrument failed after recovery and was unable to be calibrated, thus the mean values from the calibration of five other deployments were averaged. In addition, the 38 kHz channel failed during deployment, identified by issues the transmit power and impedence on the 38 kHz channel 2 in the raw files. Calibrations had occured in Seattle, Washington either prior to deployment or after recovery using a 38.1-mm tungsten carbide sphere following the standard sphere method (Demer et al., 2015).
EK80 Water Column Sonar Data Collected During SME100-201901 Deployment
공공데이터포털
A bottom moored echosounder was deployed at 95.6 m depth in the NW Bering Sea (61.85022 N, 176.25066 W) from 26 July 2019 to 31 August 2020. The mooring was instrumented with a battery powered EK80 wideband autonomous transceiver (WBAT, Simrad AS). The echosounder operated an upwards facing depth-rated 70 kHz 18° split-beam transducer (ES70-18CD), positioned upward with a two-axis gimbal equipped with a 0.7 kg counterweight. During the deployment, the WBAT was programmed to transmit an ensemble of 320 narrowband and 35 wideband every two hours. Data were recorded to a range of 155 m. Calibrations had occured in Seattle, Washington either prior to deployment or after recovery using a 38.1-mm tungsten carbide sphere following the standard sphere method (Demer et al., 2015).
EK80 Water Column Sonar Data Collected During SME120-201901 Deployment
공공데이터포털
A bottom moored echosounder was deployed at 116.3 m depth in the NW Bering Sea (61.36881 N, 177.17 W) from 26 July 2019 to 31 August 2020. The mooring was instrumented with a battery powered EK80 wideband autonomous transceiver (WBAT, Simrad AS). The echosounder operated an upwards facing depth-rated 70 kHz 18° split-beam transducer (ES70-18CD), positioned upward with a two-axis gimbal equipped with a 0.7 kg counterweight. During the deployment, the WBAT was programmed to transmit an ensemble of 320 narrowband and 35 wideband every two hours. Data were recorded to a range of 155 m. Calibrations had occured in Seattle, Washington either prior to deployment or after recovery using a 38.1-mm tungsten carbide sphere following the standard sphere method (Demer et al., 2015).
EK80 Water Column Sonar Data Collected During SME140-201901 Deployment
공공데이터포털
A bottom moored echosounder was deployed at 137.6 m depth in the NW Bering Sea (61.06918 N, 177.73993 W) from 26 July 2019 to 31 August 2020. The mooring was instrumented with a battery powered EK80 wideband autonomous transceiver (WBAT, Simrad AS). The echosounder operated an upwards facing depth-rated 70 kHz 18° split-beam transducer (ES70-18CD), positioned upward with a two-axis gimbal equipped with a 0.7 kg counterweight. During the deployment, the WBAT was programmed to transmit an ensemble of 320 narrowband and 35 wideband every two hours. Data were recorded to a range of 155 m. Calibrations had occured in Seattle, Washington either prior to deployment or after recovery using a 38.1-mm tungsten carbide sphere following the standard sphere method (Demer et al., 2015).
EK80 Water Column Sonar Data Collected During DAFT5-C1-201801 Deployment
공공데이터포털
A bottom moored echosounder was deployed at 44.4 m depth in the NE Chukchi Sea (70.836015N, 163.114758W) from 15 August 2018 to 04 September 2019. The mooring was instrumented with a battery powered EK80 wideband autonomous transceiver (WBAT, Simrad AS). The echosounder operated an upwards facing depth-rated 70 kHz 18° split-beam transducer (ES70-18CD), positioned upward with a two-axis gimbal equipped with a 0.7 kg counterweight. The echosounder also operated a combined 38 kHz 18° split-beam and 200 kHz 18° single-beam (ES38-18/200-18C) mounted at a fixed position. Both transducer faces were positioned at a height of 0.8 m above the seafloor. During the deployment, the WBAT was programmed to transmit an ensemble of 300 narrowband (200 pings at 70 kHz, 100 pings at 38 and 200 kHz) and 50 wideband (25 pings at 70 kHz, 25 pings at 38 and 200 kHz) every two hours. Data were recorded to a range of 60 m. Echosounders were calibrated in Seattle, Washington after instrument recovery using a 38.1-mm tungsten carbide sphere following the standard sphere method (Demer et al., 2015).
EK80 Water Column Sonar Data Collected During DAFT2-C1-201701 Deployment
공공데이터포털
A bottom-moored echosounder was deployed at 44.44 m depth in the NE Chukchi Sea (70.8357N, 163.1044W) from 09 August 2017 to 14 August 2018. The mooring was instrumented with a battery-powered EK80 wideband autonomous transceiver (WBAT, Simrad AS). The echosounder operated an upwards facing depth-rated 70 kHz 18° split-beam transducer (ES70-18CD), positioned upward with a two-axis gimbal equipped with a 0.7 kg counterweight. The echosounder also operated a combined 38 kHz 18° split-beam and 200 kHz 18° single-beam (ES38-18/200-18C) mounted at a fixed position. Both transducer faces were positioned at a height of 0.8 m above the seafloor. During the deployment, the WBAT was programmed to transmit an ensemble of 300 pings (200 pings at 70 kHz, 100 pings at 38 and 200 kHz) during an ~3-minute wake up every two hours. Data were recorded to a range of 60 m. Echosounders were calibrated in Seattle, Washington prior to deployment using a 38.1-mm tungsten carbide sphere following the standard sphere method (Demer et al., 2015).
EK80 Water Column Sonar Data Collected During SD1049-2020-01
공공데이터포털
The Midwater Assessment and Conservation Engineering (MACE) program of NOAA Fisheries, Alaska Fisheries Science Center (AFSC) conducted acoustic stock assessment surveys in the eastern Bering Sea (EBS) in summer of 2020 to estimate distribution and abundance of walleye pollock (Gadus chalcogrammus). This survey was initially intended as a ship-based survey, but this was cancelled due to the emerging COVID-19 pandemic. The survey was completed by three chartered 7 meter saildrone USVs. The primary water column acoustic instrument for the survey was a Simrad EK80 mini scientific echosounder system equipped with a dual frequency ES38-18/200-18CR transducer (38 kHz split-beam, 200 kHz single beam). The vessels departed Alameda, CA on 13-14 May, conducted an acoustic survey of the Bering Sea from 4-20 August, and returned to Alameda on 4 October. The echosounder system was calibrated via the standard sphere method before and after the cruise.
EK80 Water Column Sonar Data Collected During SD1043-2020-01
공공데이터포털
The Midwater Assessment and Conservation Engineering (MACE) program of NOAA Fisheries, Alaska Fisheries Science Center (AFSC) conducted acoustic stock assessment surveys in the eastern Bering Sea (EBS) in summer of 2020 to estimate distribution and abundance of walleye pollock (Gadus chalcogrammus). This survey was initially intended as a ship-based survey, but this was cancelled due to the emerging COVID-19 pandemic. The survey was completed by three chartered 7 meter saildrone USVs. The primary water column acoustic instrument for the survey was a Simrad EK80 mini scientific echosounder system equipped with a dual frequency ES38-18/200-18CR transducer (38 kHz split-beam, 200 kHz single beam). The vessels departed Alameda, CA on 13-14 May, conducted an acoustic survey of the Bering Sea from 4-20 August, and returned to Alameda on 4 October. The echosounder system was calibrated via the standard sphere method before and after the cruise.
SWOT 2019-2020 Prelaunch Oceanography Field Campaign SIO Pressure-sensing Inverted Echo Sounder (PIES)
공공데이터포털
This dataset provides the in-situ measurements from a Pressure-sensing Inverted Echo Sounder (PIES) deployed by the SWOT prelaunch field campaign. The campaign was designed to test the performance of several instruments/platforms in meeting the SWOT Calibration/Validation (CalVal) requirement. It was conducted near the SWOT CalVal crossover location, about 300 kilometers west of Monterey, California between September, 2019 and January, 2020. The campaign also deployed three CTD moorings, a slocum glider, and another bottom pressure recorder. The PIES measurements include bottom pressure and the round-trip travel time from the IES, which can be used to derive equivalent steric height through regression. Details can be found in the user guide and the journal reference given in the documentation section.
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