Advancing two‐component partitioning of light scattering in Cayuga Lake, New York. (27th October 2015)

• Record Type: Journal Article
• Authors: Peng, Feng; Effler, Steven W.
• Is Part Of: Limnology and oceanography. Volume 61:Number 1(2016)
• Page Start: 298
• Page End: 315
• Publication Date: 2015-10-27
• Subjects: Limnology -- Periodicals; Oceanography -- Periodicals; Océanographie; Limnologie; Limnology; Oceanography; Computer network resources; Périodique électronique (Descripteur de forme); Ressource Internet (Descripteur de forme); Periodicals; 551.4805
• DOI: 10.1002/lno.10216
• Languages: English
• ISSNs: 0024-3590

Abstract

Abstract: 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.