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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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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.

Item URL in elib:https://elib.dlr.de/8903/
Document Type:Contribution to a Collection
Additional Information: LIDO-Berichtsjahr=2000,
Title:Characterization of the phytoplankton in Lake Constance for classification by remote sensing
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Journal or Publication Title:Lake Constance, Characterization of an ecosystem in transition
Refereed publication:Yes
Open Access:No
Gold Open Access:No
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
Location: Oberpfaffenhofen
Institutes and Institutions:Institut für Optoelektronik
Deposited By: Roehl, Cornelia
Deposited On:09 May 2006
Last Modified:06 Jan 2010 23:23

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