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Appears in Collections:Biological and Environmental Sciences Journal Articles
Peer Review Status: Refereed
Title: Deriving inherent optical properties from classical water color measurements: Forel-ule index and secchi disk depth
Author(s): Wang, Shenglei
Lee, Zhongpin
Shang, Shaoling
Li, Junsheng
Zhang, Bing
Lin, Gong
Issue Date: 4-Mar-2019
Citation: Wang S, Lee Z, Shang S, Li J, Zhang B & Lin G (2019) Deriving inherent optical properties from classical water color measurements: Forel-ule index and secchi disk depth. Optics Express, 27 (5), pp. 7642-7655.
Abstract: Secchi disk depth (ZSD) and Forel-Ule index (FUI) are the two oldest and easiest measurements of water optical properties based on visual determination. With an overarching objective to obtain water inherent optical properties (IOPs) using these historical measurements, this study presents a model for associating remote-sensing reflectance (Rrs) with FUI and ZSD. Based upon this, a scheme (FZ2ab) for converting FUI and ZSD to absorption (a) and backscattering coefficients (bb) is developed and evaluated. For a data set from HydroLight simulations, the difference is < 11% between FZ2ab-derived a and known a, and < 28% between FZ2ab-derived bb and known bb. Further, for a data set from field measurements, the difference is < 30% between FZ2ab-derived a and measured a. These results indicate that FZ2ab can bridge the gap between historical measurements and the focus of IOP measurements in modern marine optics, and potentially extend our knowledge on the bio-optical properties of global seas to the past century through the historical measurements of FUI and ZSD.
DOI Link: 10.1364/OE.27.007642
Rights: Users are allowed to read, download, copy, distribute, print, search, or link to the full text of the article, or use them for any other lawful purpose, without asking prior permission from the publisher or the Author(s). This is in accordance with the BOAI definition of open access.

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