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A Primary Production Algorithm Developed for Lake Constance

Thiemann, Sabine and Häse, Clivia (2002) A Primary Production Algorithm Developed for Lake Constance. 7th International Conference on Remote Sensing for Marine and Coastal Environments, Miami, 20.-22. Mai 2002.

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Abstract

A primary production algorithm based on remote sensing data as inputs is under development for inland waters. For this task, Lake Constance represents a good test site since there exists an extended data base of various in situ measurements for the last two decades. A widely used open ocean primary production model will be adjusted to the conditions in inland waters by combining experimental data and sensitivity analyses. Main factors influencing the primary production are the chlorophyll concentration at the surface, light, temperature, depth of the mixed layer, vertical distribution of water constituents, primary production parameters, and phytoplankton taxonomic composition. The first three factors can be derived from existing satellite data like MOS, NOAA/AVHRR, and METEOSAT. For chlorophyll and temperature as well as wind speed derived from Radar data the synergetic use of the sensors on board of ENVISAT is planned. The data analysis showed that at noon 44 % of the variance in primary production can already be explained by the surface chlorophyll concentration. From surface data, chlorophyll can be well extrapolated down to 10 m water depth which corresponds fairly well with the main part of the euphotic zone during the vegetation period in Lake Constance. The depth-resolved model for the euphotic zone can be improved by using the optical depth instead of the geometrical depth. Temperature as influencing factor is relevant mainly within the upper four meters where primary production is sensitive to temperature. It is studied whether it can be derived together with the depth of the mixed layer from the surface temperature and the two week history of weather data (air temperature, wind speed, and global irradiance) using a neural network approach.

Document Type:Conference or Workshop Item (Paper)
Additional Information: LIDO-Berichtsjahr=2002,
Title:A Primary Production Algorithm Developed for Lake Constance
Authors:
AuthorsInstitution or Email of Authors
Thiemann, SabineUNSPECIFIED
Häse, CliviaUNSPECIFIED
Date:2002
Status:Published
Event Title:7th International Conference on Remote Sensing for Marine and Coastal Environments, Miami, 20.-22. Mai 2002
Organizer:VERIDIAN
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:Remote Sensing Technology Institute
Deposited By: Cornelia Roehl
Deposited On:02 Feb 2006
Last Modified:06 Jan 2010 22:10

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