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Spectral variability of downwelling irradiance in water induced by wave focusing

Gege, Peter und Pinnel, Nicole (2011) Spectral variability of downwelling irradiance in water induced by wave focusing. ASLO 2011, 14.-18. Feb. 2011, San Juan, Puerto Rico.

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Kurzfassung

If the water surface is not perfectly flat, the downwelling irradiance in water is highly variable due to focusing and defocusing of the sun and sky light. The time scales and intensity variations caused by this wave focusing effect are well-studied. Much less is known about the induced spectral variability. We have developed a spectral model which describes the wave focusing effect by two parameters that can be determined for each irradiance measurement, and applied it to a large data set from three German lakes to study the spectral variability in the depth range from 0 to 5 m. It was found that the variance of spectral irradiance can be described quantitatively by a "geometry factor" which has a smooth spectral shape in the range 400 to 700 nm. For our data set the average variability across that range was 5 %; for 9 % of the data the spectral changes were > 15 %.

Dokumentart:Konferenzbeitrag (Vortrag)
Titel:Spectral variability of downwelling irradiance in water induced by wave focusing
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Gege, Peterpeter.gege@dlr.de
Pinnel, Nicolenicole.pinnel@dlr.de
Datum:16 Februar 2011
Status:veröffentlicht
Stichwörter:Irradiance, variance, water, spectroscopy, wave focusing
Veranstaltungstitel:ASLO 2011
Veranstaltungsort:San Juan, Puerto Rico
Veranstaltungsart:internationale Konferenz
Veranstaltungsdatum:14.-18. Feb. 2011
Veranstalter :ASLO
HGF - Forschungsbereich:Verkehr und Weltraum (alt)
HGF - Programm:Weltraum (alt)
HGF - Programmthema:W EO - Erdbeobachtung
DLR - Schwerpunkt:Weltraum
DLR - Forschungsgebiet:W EO - Erdbeobachtung
DLR - Teilgebiet (Projekt, Vorhaben):W - Vorhaben Spektrometrische Verfahren und Konzepte der Fernerkundung (alt)
Standort: Oberpfaffenhofen
Institute & Einrichtungen:Institut für Methodik der Fernerkundung > Experimentelle Verfahren
Hinterlegt von: Dr.rer.nat. Peter Gege
Hinterlegt am:15 Mär 2011 08:25
Letzte Änderung:15 Mär 2011 08:25

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