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Utilizing Downwelling Irradiance for Phytoplankton Determination

Gege, Peter (2012) Utilizing Downwelling Irradiance for Phytoplankton Determination. Ocean Optics XXI, 8.-12. Okt. 2012, Glasgow, Scotland.

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Abstract

The downwelling irradiance is rarely utilized to determine optical parameters of a water body since the ever-changing water surface induces strong signal fluctuations in the upper meters of typically 20 to 40 %. An analytic model has been developed that calculates the spectra of the direct and diffuse component separately. It can cope with the fluctuations by treating, in addition to the unknown optical parameters of the water body, also the intensities of the two irradiance components as fit parameters during data analysis. The potential of this model for the determination of phytoplankton concentration was analyzed using data from two German lakes. Three phytoplankton classes could be identified above thresholds between 0.4 and 0.8 μg/l, and total pigment concentration (sum of chlorophyll-a and phaeophytin-a) could be determined with an uncertainty of 0.7 μg/l. This new approach may be of particular interest for shallow waters, where it is difficult to apply the usual reflectance-based algorithms due to bottom influences.

Document Type:Conference or Workshop Item (Paper, Poster)
Title:Utilizing Downwelling Irradiance for Phytoplankton Determination
Authors:
AuthorsInstitution or Email of Authors
Gege, PeterUNSPECIFIED
Date:October 2012
Refereed publication:No
In ISI Web of Science:No
Page Range:pp. 1-9
Status:Published
Keywords:Irradiance, Water, Inversion, Phytoplankton
Event Title:Ocean Optics XXI
Event Location:Glasgow, Scotland
Event Type:international Conference
Event Dates:8.-12. Okt. 2012
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
Location: Oberpfaffenhofen
Institutes and Institutions:Remote Sensing Technology Institute > Experimental Methods
Deposited By: Dr.rer.nat. Peter Gege
Deposited On:25 Oct 2012 13:20
Last Modified:01 Mar 2013 15:40

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