| Summary: | Maintenance and Update Frequency: asNeeded Statement: Original field data. This record describes scientific split-beam echosounder data collected on the RV Investigator voyage IN2020_V09 (SOTS: Southern Ocean Time Series automated moorings for climate and carbon cycle studies southwest of Tasmania), which departed Hobart on the 27th August 2020 and returned to Hobart on the 12th September 2020. In addition to the tasks at the SOTS site the voyage also recovered a Rintoul mooring that was deployed during IN2020_V05. The Simrad EK80 wide band transceivers (WBT) 18, 38, 70, 120, 200 and 333 kHz, as well as the EK60 split-beam GPT 18kHz were used to acquire acoustic backscatter data to a range of 1500 m, during the voyage. All frequencies were logged sporadically (only when transiting) for the extent of the voyage. The frequencies were set to passive for the periods when stationary during the voyage. Note: the EK80 18kHz WBT failed at 12:06 on the 28th August 2020 (UTC) and was no longer used for the voyage. The 18kHz transducer was changed over to the EK60 GPT for the remainder of the voyage (in place of the 18kHz WBT). Data are stored in *.raw, *.bot and *.idx format at CSIRO. There are 291 files totalling 27.7 GB of raw data in this dataset. No processing has been conducted on this data. Additional information regarding this dataset is contained in the GSM data acquisition and processing report. Additional data products may be available on request.
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