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Characterization of the phytoplankton in Lake Constance for classification by remote sensing

Gege, Peter (1998) Characterization of the phytoplankton in Lake Constance for classification by remote sensing. In: Lake Constance, Characterization of an ecosystem in transition Arch. Hydrobiol. Spec. Issues Advanc. Limnol,, 53. E. Schweizerbart'sche Verlagsbuchhandlung (Nägele und Obermiller). ISBN 0071-1128.

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Abstract

Phytoplankton influences the spectral reflectance of most waters, thus it is accessible to remote sensing. This study investigates how the phytoplankton in Lake Constance (Bodensee) must be characterized to enable a quantitative determination of its concentration by remote sensing. A classification based on specific absorption spectra and neglecting species-specific differences in backs-cattering was found to be suitable. When an irradiance reflectance model is applied which accounts for the influence of additional absorbing and scattering water con-stituents and which is insensitive against moderate sunglint contamination of reflectance measu-rements, the concentrations of four phytoplankton spectral classes can be determined. The threshold concentration of a phytoplankton spectral class that is required before it can be distinguished from the other classes lies between 12 and 25 %, depending on the natural variability of its specific absorption spectrum. The accuracy of the determination of the total chlorophyll-a concentration is improved by 45 % compared to other remote sensing algorithms which neglect absorption differences between phytoplankton classes and determine the chlorophyll-a concentration from phytoplankton absorption at a single best-suited wavelength. The remaining error of chlorophyll-a determination is ± 31 % for the concentration range of 3.6-64 µg/l. It is comparable with the error when the concentration is derived from a microscopic analysis of water samples by considering the biovolumes. Below 3.6 µg/l the model cannot determine the chlorophyll-a concentration reliably from reflectance measurements.

Document Type:Contribution to a Collection
Additional Information: LIDO-Berichtsjahr=2000,
Title:Characterization of the phytoplankton in Lake Constance for classification by remote sensing
Authors:
AuthorsInstitution or Email of Authors
Gege, PeterUNSPECIFIED
Date:1998
Journal or Publication Title:Lake Constance, Characterization of an ecosystem in transition
Refereed publication:Yes
In ISI Web of Science:No
Volume:53
Editors:
EditorsEmail
Bäuerle, E.UNSPECIFIED
Gaedke, U.UNSPECIFIED
Publisher:E. Schweizerbart'sche Verlagsbuchhandlung (Nägele und Obermiller)
Series Name:Arch. Hydrobiol. Spec. Issues Advanc. Limnol,
ISBN:0071-1128
Status:Published
Keywords:Phytoplankton, reflectance, remote sensing, inverse modeling, Bodensee
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EO - Erdbeobachtung
DLR - Research area:Space
DLR - Program:W EO - Erdbeobachtung
DLR - Research theme (Project):UNSPECIFIED
Location: Oberpfaffenhofen
Institutes and Institutions:Institut für Optoelektronik
Deposited By: Cornelia Roehl
Deposited On:09 May 2006
Last Modified:06 Jan 2010 23:23

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