<div><p>Acoustic data were collected nearly continuously using Simrad EK60s at 4 frequencies (38, 70, 120, and 200 kHz). Split beam transducers (Simrad model numbers: 38-12, 70-7c, 120-7c, 200-7c) were mounted 1.5 m below the surface on a rigid pole. Each transmitted a 512 us pulse as frequently as possible for the water depth. Raw data were stored using Simrad ER60 software.</p>
<p>Noise from splash down, electrical interference, and CTD casts were flagged as ‘bad data’ using Echoview software before integration. Acoustic backscattering values at 38 kHz that were greater than -75 dB were integrated in 1 km horizontal bins from depths of 5m to 500m or 1 m above the bottom, whichever was shallower. These integrated, area scattering values or Nautical Area Scattering Coefficients (NASC: m2 nmi-2) are provided.</p></div>
Nautical Area Scattering Coefficients (NASC) from NH1006 and NH1106 cruises, Guaymas Basin.
<div><p>Integrated, area scattering values, or Natuical Area Scattering Coefficients (NASC) are provided from two cruises in the Guaymas Basin that occurred in June 2010 and June 2011. Also included are the time (UTC) and location at the start and end of each integration bin, mean depth of the exclusion line for each bin, and the average thickness of the integrated cell.</p>
<p>Raw acoustic scattering data (.raw files) are extremely large. These are archived at Oregon State University and will be shared using physical media upon request.</p></div>
Integrated Acoustic Scattering NH
<div><p>BCO-DMO Processing Notes:<br />
- Modified parameter names to conform with BCO-DMO naming conventions.<br />
- Replaced values of '999' in the lat and lon columns with 'nd' to indicate 'no data'.<br />
- Reformatted display of time from HH:MM:SS to HHMM.mmmm</p></div>
4013
Integrated Acoustic Scattering NH
2013-08-15T14:42:10-04:00
2013-08-15T14:42:10-04:00
2023-07-07T16:10:26-04:00
urn:bcodmo:dataset:4013
Nautical Area Scattering Coefficients (NASC) from R/V New Horizon cruises NH1106 and NH1006 in the Guaymas Basin in 2010 and 2011 (Jumbo Squid Physiology project)
Integrated, area scattering values, or Natuical Area Scattering Coefficients (NASC) are provided from two cruises in the Guaymas Basin that occurred in June 2010 and June 2011. Also included are the time (UTC) and location at the start and end of each integration bin, mean depth of the exclusion line for each bin, and the average thickness of the integrated cell.
Raw acoustic scattering data (.raw files) are extremely large. These are archived at Oregon State University and will be shared using physical media upon request.
false
Benoit-Bird, K. (2013) Nautical Area Scattering Coefficients (NASC) from R/V New Horizon cruises NH1106 and NH1006 in the Guaymas Basin in 2010 and 2011 (Jumbo Squid Physiology project). Biological and Chemical Oceanography Data Management Office (BCO-DMO). (Version 1) Version Date 2013-08-15 [if applicable, indicate subset used]. doi:10.1575/1912/bco-dmo.4013.1 [access date]
true
1
10.1575/1912/bco-dmo.4013.1
false
2013-08-15
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