Derived parameters

Calculate derive parameters using Ruskin software or on the RBR instrument itself, depending on how it is configured. Both routes use the same equations and produce identical results.

Calculation on Ruskin

All derived parameters will be calculated on Ruskin:

  • when the data storage format is set to Desktop and Realtime is set to None

As a result, the RSK file will only store raw data. This option enables post-processing on Ruskin, with the flexibility of changing the variables.

To obtain derived parameters, download the dataset to your laptop and open it on Ruskin, then input physical parameters into the Parameters tab. Furthermore, Ruskin has alternative derivation options for some parameters, which you can also select in the Parameters tab. See Ruskin User Guide: Standard Instruments³ for details.

The Desktop storage format is a preferred option. Having the raw data keeps more options open in the long term.

However, when you are managing your deployments using a smartphone, it is more efficient to derive parameters in realtime than post-process a large RSK file with raw data, due to limited capabilities of mobile devices.

Calculation on the instrument

All derived parameters will be calculated on the instrument:

  • when the data storage format is set to Mobile
    or

  • when the data storage format is set to Desktop and Realtime is set to Serial or USB

As a result, the RSK file will store the data with calibration coefficients already applied and derived parameters already calculated.

CT measurements allow for deriving salinity, specific conductivity, speed of sound, and density anomaly.

CTD measurements allow for deriving salinity, specific conductivity, speed of sound, density anomaly, sea pressure, and depth.