Parameter: bbp700

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
Supplied Units: 
m -1
Conversion Necessary: 
no
No Data Value: 
nd
Description: 

Particulate backscattering coefficient bbp (700nm); Acquired with WET Labs MCOMS Scattering Meter with 700-nm wavelength and in-water centroid angle of 150 deg. See Table 3 in paper.

The particulate volume scattering coefficient ?p was calculated as

?p(150 deg,700 nm) [m-1 sr-1] = Scale Factor * (Output - Dark Counts)

using a factory-determined scale factor and a dark offset, computed separately for each sensor as the mean of the deep-water minima measured during all profiles between July and September 2013 at BATS (https://www.bco-dmo.org/dataset/728371). Particulate backscattering coefficient, bbp(?) [m-1], is estimated as

bbp = 2???p(150 deg)

? = 1.13 for 150 deg (from Boss and Pegau 2001).