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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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|
|Title:||Characterization of the phytoplankton in Lake Constance for classification by remote sensing|
|Journal or Publication Title:||Lake Constance, Characterization of an ecosystem in transition|
|In ISI Web of Science:||No|
|Publisher:||E. Schweizerbart'sche Verlagsbuchhandlung (Nägele und Obermiller)|
|Series Name:||Arch. Hydrobiol. Spec. Issues Advanc. Limnol,|
|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|
|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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