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Analytic model for the direct and diffuse components of downwelling spectral irradiance in water

Gege, Peter (2012) Analytic model for the direct and diffuse components of downwelling spectral irradiance in water. Applied Optics, 51 (9), pp. 1407-1419. Optical Society of America. ISSN 1559-128X


Official URL: http://www.opticsinfobase.org/ao/viewmedia.cfm?uri=ao-51-9-1407&seq=0


The direct and diffuse components of downwelling irradiance have in general different path lengths in water, hence they decrease differently with sensor depth. Further, the ever changing geometry of a wind-roughened and wave-modulated water surface induces uncorrelated intensity changes to these components. In order to cope with both effects, an analytic model of the downwelling irradiance in water was developed which calculates the direct and diffuse components separately. By assigning weights fdd and fds to the intensities of the two components, measurements performed at arbitrary surface conditions can be analysed by treating fdd and fds as fit parameters. The model was validated against Hydrolight and implemented into the public domain software WASI. It was applied to data from three German lakes to determine the statistics of fdd and fds, to derive the sensor depth of each measurement, and to estimate the concentrations of water constituents.

Item URL in elib:https://elib.dlr.de/75266/
Document Type:Article
Title:Analytic model for the direct and diffuse components of downwelling spectral irradiance in water
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Gege, Peterpeter.gege (at) dlr.deUNSPECIFIED
Date:20 March 2012
Journal or Publication Title:Applied Optics
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:Yes
Page Range:pp. 1407-1419
Publisher:Optical Society of America
Keywords:Irradiance, water, analytic model, inversion, WASI
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Erdbeobachtung
DLR - Research theme (Project):R - Vorhaben Spektrometrische Verfahren und Konzepte der Fernerkundung (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Remote Sensing Technology Institute > Experimental Methods
Deposited By: Gege, Dr.rer.nat. Peter
Deposited On:21 Mar 2012 11:42
Last Modified:31 Jul 2019 19:35

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