\chi: conversion factor depending on sensor angle, provided in Argo reference table
BETASWxxx is the contribution to the Volume Scattering Function (VSF) by pure seawater at xxx nanometers wavelength. Code to calculate this based on Zhang et al. (2009) provided here: http://doi.org/10.17882/42916
The coefficients should be included in PREDEPLOYMENTCALIB***, ex:
PREDEPLOYMENT_CALIB_EQUATION="BBP700=2pichi((BETA_BACKSCATTERING700-DARK_BACKSCATTERING700_O)SCALE_BACKSCATTERING700-BETASW700)"
PREDEPLOYMENT_CALIB_COEFFICIENT="DARK_BACKSCATTERING700=71, DARK_BACKSCATTERING700_O=80, SCALE_BACKSCATTERING700=0.008, chi=1.076, BETASW700 (contribution of pure sea water) is calculated at 124°"
PREDEPLOYMENT_CALIB_COMMENT="Sullivan et al., 2013, Zhang et al., 2009, BETASW700 is the contribution by the pure seawater at 700nm, requiring temperature, salinity and using a depolarization of 0.039, its default value. the script can be found at http://doi.org/10.17882/42916.
Raw data from the backscattering meter (BETA_BACKSCATTERINGxxx) are transmitted as counts.
The equation to convert from counts to backscatter is:
BBPxxx = 2\pi\chi[(BETA_BACKSCATTERINGxxx - DARK_BACKSCATTERINGxxx)*SCALE_BACKSCATTERINGxxx - BETASWxxx]
where:
\chi: conversion factor depending on sensor angle, provided in Argo reference table
BETASWxxx is the contribution to the Volume Scattering Function (VSF) by pure seawater at xxx nanometers wavelength. Code to calculate this based on Zhang et al. (2009) provided here: http://doi.org/10.17882/42916
The coefficients should be included in PREDEPLOYMENTCALIB***, ex:
PREDEPLOYMENT_CALIB_EQUATION="BBP700=2pichi((BETA_BACKSCATTERING700-DARK_BACKSCATTERING700_O)SCALE_BACKSCATTERING700-BETASW700)" PREDEPLOYMENT_CALIB_COEFFICIENT="DARK_BACKSCATTERING700=71, DARK_BACKSCATTERING700_O=80, SCALE_BACKSCATTERING700=0.008, chi=1.076, BETASW700 (contribution of pure sea water) is calculated at 124°" PREDEPLOYMENT_CALIB_COMMENT="Sullivan et al., 2013, Zhang et al., 2009, BETASW700 is the contribution by the pure seawater at 700nm, requiring temperature, salinity and using a depolarization of 0.039, its default value. the script can be found at http://doi.org/10.17882/42916.