NTR: New P01 Beta backscattering terms required - volume scattering coefficient [BODCNVS-2066]

[danibodc]

New P01 terms required for volume scattering coefficient, termed 'Beta' in the community, for various wavelengths. In use amongst Argo, Autosub and OceanGliders communities using Wetlabs ECO optical backscattering sensors.

A second group of terms for Beta(p) where scattering of seawater is removed, so the resulting parameter is the volume scattering attributable to particles only.

• Beta: Raw counts are converted to the total Volume Scattering coefficient (β, m-1 sr-1) using the manufacturer-supplied calibration coefficients (scaling factor and dark counts)

• Beta(p): The Volume Scattering of seawater is calculated and then removed from the total Volume Scattering, to obtain the Volume Scattering attributable to particles only (βp, m-1 sr-1).

Volume scattering coefficient {Beta} of electromagnetic radiation (412nm wavelength) in the water body by in-situ optical backscatter measurement Volume scattering coefficient {Beta} of electromagnetic radiation (470nm wavelength) in the water body by in-situ optical backscatter measurement Volume scattering coefficient {Beta} of electromagnetic radiation (532nm wavelength) in the water body by in-situ optical backscatter measurement Volume scattering coefficient {Beta} of electromagnetic radiation (650nm wavelength) in the water body by in-situ optical backscatter measurement Volume scattering coefficient {Beta} of electromagnetic radiation (700nm wavelength) in the water body by in-situ optical backscatter measurement Volume scattering coefficient {Beta} of electromagnetic radiation (800nm wavelength) in the water body by in-situ optical backscatter measurement Volume scattering coefficient {Beta} of electromagnetic radiation (880nm wavelength) in the water body by in-situ optical backscatter measurement

Volume scattering attributable to particles {Beta(p)} of electromagnetic radiation (412nm wavelength) in the water body by in-situ optical backscatter measurement Volume scattering attributable to particles {Beta(p)} of electromagnetic radiation (470nm wavelength) in the water body by in-situ optical backscatter measurement Volume scattering attributable to particles {Beta(p)} of electromagnetic radiation (532nm wavelength) in the water body by in-situ optical backscatter measurement Volume scattering attributable to particles {Beta(p)} of electromagnetic radiation (650nm wavelength) in the water body by in-situ optical backscatter measurement Volume scattering attributable to particles {Beta(p)} of electromagnetic radiation (700nm wavelength) in the water body by in-situ optical backscatter measurement Volume scattering attributable to particles {Beta(p)} of electromagnetic radiation (800nm wavelength) in the water body by in-situ optical backscatter measurement Volume scattering attributable to particles {Beta(p)} of electromagnetic radiation (880nm wavelength) in the water body by in-situ optical backscatter measurement

[danibodc]

@gwemon I think actually I should use S29 'instrument output (xxx wavelength)' as opposed to 'electromagnetic radiation (xxx wavelength)', and have the matrix as 'not applicable' as opposed to 'water body', as this is still the raw output from the instrument but has had the manufacturer's scale factor applied to the raw and dark counts.

[gwemon]

@danibodc we need to think carefully about the construction of these. Are these both Volume scattering coefficients (i.e. same quantity kind, same vector dimension)? but one is of water plus particles while the other is of particles only?

[danibodc]

Will keep to the original plan, using ' electromagnetic radiation (xxx wavelength) in the water body' as this is not a pure raw output.

[danibodc]

These terms have now been loaded to P01 and will be live on the NVS from tomorrow morning:

BVSFO412 Volume scattering coefficient of electromagnetic radiation (412nm wavelength) {Beta} in the water body by in-situ optical backscatter measurement BVSFO470 Volume scattering coefficient of electromagnetic radiation (470nm wavelength) {Beta} in the water body by in-situ optical backscatter measurement BVSFO532 Volume scattering coefficient of electromagnetic radiation (532nm wavelength) {Beta} in the water body by in-situ optical backscatter measurement BVSFO650 Volume scattering coefficient of electromagnetic radiation (650nm wavelength) {Beta} in the water body by in-situ optical backscatter measurement BVSFO700 Volume scattering coefficient of electromagnetic radiation (700nm wavelength) {Beta} in the water body by in-situ optical backscatter measurement BVSFO800 Volume scattering coefficient of electromagnetic radiation (800nm wavelength) {Beta} in the water body by in-situ optical backscatter measurement BVSFO880 Volume scattering coefficient of electromagnetic radiation (880nm wavelength) {Beta} in the water body by in-situ optical backscatter measurement

BPVSO412 Volume scattering attributable to particles of electromagnetic radiation (412nm wavelength) {Beta(p)} in the water body by in-situ optical backscatter measurement BPVSO470 Volume scattering attributable to particles of electromagnetic radiation (470nm wavelength) {Beta(p)} in the water body by in-situ optical backscatter measurement BPVSO532 Volume scattering attributable to particles of electromagnetic radiation (532nm wavelength) {Beta(p)} in the water body by in-situ optical backscatter measurement BPVSO650 Volume scattering attributable to particles of electromagnetic radiation (650nm wavelength) {Beta(p)} in the water body by in-situ optical backscatter measurement BPVSO700 Volume scattering attributable to particles of electromagnetic radiation (700nm wavelength) {Beta(p)} in the water body by in-situ optical backscatter measurement BPVSO800 Volume scattering attributable to particles of electromagnetic radiation (800nm wavelength) {Beta(p)} in the water body by in-situ optical backscatter measurement BPVSO880 Volume scattering attributable to particles of electromagnetic radiation (880nm wavelength) {Beta(p)} in the water body by in-situ optical backscatter measurement