Notes for Lago Sarmiento CTD casts - August 2012
CTD arrived in crate via cargo system but the crate did not contaion the data/power interface cable. We arranged to bvorrow one from Carlos Moffat in Concepcion. It arrived on 8/16/12.
One week earlier, Dunbar installed the SBE43 unit on the SBE 19plusV2. Plumbing and mounting was easy. The software changes less so. The SBE43 was cabled into connector J2 (voltage 2,3). Dunbar called SeaBird and learned that a simple command of Volt2=Y would include the voltage logging from this sensor. Next, the configuration file used for data processing was modified to include an extra voltage channel and it was assigned to the SBE43 along with the sensor calibration coefficients specific to our SBE43.
On 8/17/12 we did our first CTD bat the far eastern end of the lake:
raw file: SBE19plus_01906823_2012_08_17_0001.hex
first cnv file: SBE19plus_01906823_2012_08_17_0001Lago Sarmiento 2012 HC-10.cnv
This ctd was done with the system configured as above - e.g., with the SBE43 connector plugged into J2 and Volt2=Y. The T and S data streams look fine but it doesn't seem as though the oxygen is varying enough. So.....it may be that I either need to plug the SBE43 cable into connector J1 (and enable Volt 0 (or Volt1?) and disable Volt2) or I need to finish processing the data and see what this does to the O2 values.......Or there may be a way in the data processing modules or con file to associate the voltage channel that is open for processing with the SBE43 (but I think I've already done this).
At any event, the first CTD should have collected O2 data. Upon recovery everything looked OK so no need to reconfigure to plug J1.
Update from 8/26/12 - now processing data from Sarmiento after vessel pulled from lake. CTD memory holds 12 cast files. We did 10 and 2 were “switch on – switch off” switch position check events. CTD cast number will be acquired by matching time and date stamps using Sverre’s station log.

Notes during processing:
Cast files show 2 casts on 8-20-12 but Sverre’s notes only show one cast at 0950. Cast 5 shows 8-20-12 at 12:37.
Processing module order: datacnv, filter, alignctd, CellThermalMass, Loopedit, wildedit, derive, bin average, asciiout
OK, done processing and have 10 ctd files as Sverre shows in her notes. The internal file labelling is off on one or two but the excel sheet labels in the excel folder, e.g., C:\Users\owner\Desktop\Lago Sarmiento CTD Aug 2012\Excel Files are right. They have been cross-checked with depths and times.