Publication Date:
2015-10-28
Description:
The particulate scattering and backscattering coefficients ( b p and b bp ) were partitioned into the additive contributions of minerogenic ( b m and b b,m ) and organic ( b o and b b,o ) components for nearshore and pelagic areas of Cayuga Lake, New York, over a 7 month period in 2013. The analysis was based on paired measurements of (1) bulk b p and b bp , (2) light-scattering properties of mineral particles, with an individual particle analysis (IPA) technique, and (3) concentrations of chlorophyll a ([Chl]) and particulate organic carbon (POC), as two indices to quantify organic particle scattering. b m and b b,m were estimated through Mie theory calculations with IPA results as inputs. b o and b b,o were estimated with both system-specific and oceanic bio-optical models parameterized on [Chl] or POC. POC performed better than [Chl] as the index for both b o and b b,o . The averages of the ratios ( b m + b o ) : b p and ( b b,m + b b,o ) : b bp at 660 nm, were 1.02 and 1.03, respectively; the average relative errors were 18.2% and 15.6%. Multiple empirical bio-optical models developed for Case 1 oceanic waters (for b o and b b,o estimates) approached the closure performance of the system-specific relationships. In addition to systematically accounting for more b bp than b p , terrigenous minerogenic particles made greater contributions to both b p and b bp in the nearshore area proximate to tributary inputs than in pelagic waters. A strong positive dependency of the backscattering ratio ( b bp : b p ) on the b m : b p ratio was observed for both nearshore and pelagic areas.
Print ISSN:
0024-3590
Electronic ISSN:
1939-5590
Topics:
Biology
,
Geosciences
,
Physics
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