File(s) | Type | Description | Action |
---|---|---|---|
Backscatter.csv (313.11 MB) | Comma Separated Values (.csv) | Primary data file for dataset ID 715715 | Download |
Krill and fish were sampled acoustically and visually beneath the fast ice using the tethered SCINI ROV, which was deployed and operated through a 25 cm diameter hole drilled through the sea ice. SCINI contained cameras and thrusters, and towed a sensor package consisting of a WET Labs fluorometer (ECO-AFL/FL) and a single-beam Biosonics 120 kHz DT-X echosounder. Visual targets were identified to the lowest taxon possible; these observations were used primarily to verify classification of acoustic signals. The echosounder operated at a nominal ping rate of 1 ping s-1; however, this rate was occasionally adjusted if false bottom signals were observed. The general profile of a dive included a surface transect of ~300 m horizontal distance, where the acoustic transducer faced downward, and also a dive to ~120 m if conditions allowed. Echogram data were saved to a depth of 500 m, and background noise was removed. Given the effective range of the transducer of approximately 100 m (resolving -80 dB targets), surveys characterized the upper 200 m of the water column.
Daly, K., Saenz, B., Kim, S. (2017) Acoustic backscatter from krill and silverfish in McMurdo Sound from 2014-2015. Biological and Chemical Oceanography Data Management Office (BCO-DMO). (Version 2017-08-31) Version Date 2017-08-31 [if applicable, indicate subset used]. doi:10.1575/1912/bco-dmo.731152 [access date]
Terms of Use
This dataset is licensed under Creative Commons Attribution 4.0.
If you wish to use this dataset, it is highly recommended that you contact the original principal investigators (PI). Should the relevant PI be unavailable, please contact BCO-DMO (info@bco-dmo.org) for additional guidance. For general guidance please see the BCO-DMO Terms of Use document.