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Testbed results for scalar and vector radiative transfer computations of light in atmosphere-ocean systems

TitleTestbed results for scalar and vector radiative transfer computations of light in atmosphere-ocean systems
Publication TypeJournal Article
Year of Publication2020
AuthorsChowdhary J., Zhai P.W, Xu F., Frouin R., Ramon D.
Volume242
Date Published2020/02
Type of ArticleArticle
ISBN Number0022-4073
Accession NumberWOS:000513291600037
Keywordsatmosphere; Atmosphere-ocean system; bidirectional reflectance; coupled; markov-chain formalism; optical-properties; Optics; PACE; plane-parallel; Polarimeters; polarized-light; pure; radiative transfer; spectroscopy; Stokes parameters; Testbed; transfer model; water; water-leaving radiance; wavelength dependence
Abstract

We generate and tabulate reflectance values of the Stokes parameters I, Q and U of upwelling radiance just above a rough ocean surface and at the top of the atmosphere (TOA) for 100 scattering geometries, four atmosphere-ocean systems, and four wavelengths. The atmosphere-ocean systems increase in complexity from (a) a molecular atmosphere above a rough ocean surface (AOS-I model); to (b) a pure water body below a rough ocean surface (AOS-II model); to (c) a fully-coupled simple atmosphere-ocean system (AOS-III model) containing a molecular atmosphere, rough ocean surface, and pure water; to (d) a fully-coupled complex atmosphere-ocean system (AOS-IV model) that includes scattering by molecules, rough ocean surface, pure water, and hydrosols. Our wavelengths (350, 450, 550, and 650 nm) capture the ultraviolet-visible range. Our tables provide radiative transfer (RT) testbed results for atmosphere-ocean systems with an accuracy that surpasses the measurement accuracy of state-of-the-art polarimeters. To validate the accuracy of these tables we performed computations using three independent RT codes that provide deterministic numerical solutions for the RT equation. The agreement is 10(-5) for AOS-IV model, and 10(-6) for the other models. The degree of linear polarization computed by these RT codes differs by <= 0.2% for 15 isolated cases of tabulated reflectance values, and by <= 0.1% for all remaining cases. We also provide comparisons with results obtained by a stochastic RT code for AOS-I model. The agreement between the deterministic and stochastic results for this model is 10(-5) at TOA, and 10(-6) above the ocean surface. (C) 2019 Elsevier Ltd. All rights reserved.

DOI10.1016/j.jqsrt.2019.106717
Student Publication: 
No
Research Topics: 
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