Parameter: bbp700_corr

Dataset: 
Profile data
Parameter: 
bbp700
Master parameters information
Short Name:
 bbp700
Short Description:
 bbp700
Official Name:
 bbp700
No Data Value:
 nd
Description:
 

Particulate backscattering coefficient (bbp) Backscattering voltage was converted to beta at 140° by subtracting dark voltages (median in-situ dark voltage, 0.078 V) and multiplying by factory calibration scale factors, modified based on measurements and calculations of Sullivan et al. (subm.). The calibration factor did not change between pre-cruise and post-cruise factory calibration. at 140° was converted to bbp (m-1 or reciprocal meter) at 700 nm by subtracting of seawater (Zhang et al., 2009) and multiplying by 2pi beta(where beta = 1.132).

Dataset-parameters information
Supplied Name: 
bbp700_corr
Supplied Units: 
m -1
Conversion Necessary: 
no
Conversion Utility: 
No Data Value: 
nd
Description: 
Corrected particulate backscattering coefficient bbp (700nm); Depth profiles of particulate backscattering coefficient bbp(700 nm) were despiked using a running median filter (Briggs et al. 2011). Due to the size of the median filter window the initial and final six data points in each profile could not be despiked and appear as NaN. Park phase bbp(700 nm) data were not despiked because they were collected at a nominally constant depth. Despiked profile phase bbp(700 nm) and raw park phase bbp(700 nm) were further corrected by a float-specific deep-water offset. The minimum bbp(700 nm) measured during the long-term deployments was determined for each float (-2.0488e-04 m-1 for F033; -1.1139e-04 m-1 for F034) and subtracted from the bbp(700 nm) values derived above.