Coronavirus Information for the UC San Diego Community

Our leaders are working closely with federal and state officials to ensure your ongoing safety at the university. Stay up to date with the latest developments. Learn more.

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.
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

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.

Student Publication: 
Research Topics: