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The Strathprints institutional repository is a digital archive of University of Strathclyde's Open Access research outputs. Strathprints provides access to thousands of Open Access research papers by University of Strathclyde researchers, including by researchers from the Department of Computer & Information Sciences involved in mathematically structured programming, similarity and metric search, computer security, software systems, combinatronics and digital health.

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Estimation of absorption and backscattering coefficients from in situ radiometric measurements: theory and validation in case 2 waters

McKee, D.J.C. and Cunningham, A. and Craig, S.E. (2003) Estimation of absorption and backscattering coefficients from in situ radiometric measurements: theory and validation in case 2 waters. Applied Optics, 42 (15). pp. 2804-2810. ISSN 1559-128X

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Abstract

A model that relates the coefficients of absorption (a) and backscattering (bb) to diffuse attenuation (Kd), radiance reflectance (RL), and the mean cosine for downward irradiance (μd) is presented. Radiance transfer simulations are used to verify the physical validity of the model for a wide range of water column conditions. Analysis of these radiance transfer simulations suggests that absorption and backscattering can be estimated with average errors of 1% and 3%, respectively, if the value of μd is known with depth. If the input data set is restricted to variables that can be derived from measurements of upward radiance (Lu) and downward irradiance (Ed), it is necessary to use approximate values of μd. Examination of three different approximation schemes for μd shows that the average error for estimating a and bb increases to ~13%. We tested the model by using measurements of Lu and Ed collected from case II waters off the west coast of Scotland. The resulting estimates of a and bb were compared with independent in situ measurements of these parameters. Average errors for the data set were of the order of 10% for both absorption and backscattering.