Linnemann, Kathrin und Gege, Peter und Rößler, Sebastian und Schneider, Thomas und Melzer, Arnulf (2013) CDOM retrieval using measurements of downwelling irradiance. In: SPIE Remote Sensing 2013, 8888, Seiten 1-10. SPIE Remote Sensing 2013, 2013-09-23 - 2013-09-26, Dresden, Deutschland. doi: 10.1117/12.2031250.
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Offizielle URL: doi: 10.1117/12.2031250
Kurzfassung
As it can strongly influence the availability of light and thus primary production, coloured dissolved organic matter (CDOM) affects the function of lake ecosystems. Therefore reliable methods are required for the monitoring of CDOM concentration. A new method using downwelling irradiance was tested for applicability in four selected lakes of the Bavarian Osterseen Lake District, which consists of 19 naturally connected freshwater lakes of different trophic level. The method separates between the direct and diffuse part of the incident light in order to handle the strong variability of the underwater light field. It is implemented in the software WASI, which is capable to retrieve water constituents by inverse modeling. During field campaigns downwelling irradiance measurements using RAMSES sensors were made in different depths. Simultaneously, water samples were taken in three depths (0.5 m, 2 m and Secchi disk depth), from which the absorption coefficient of CDOM, aY, was derived in the range from 190 to 900 nm using photometric absorption measurements. Concentration (defined as aY at 440 nm) ranged from 0.33 to 1.55 m-1 ± 0.04 m-1, the spectral slope at 440 nm from 0.0120 to 0.0184 nm-1 with a mean of 0.0145 ± 0.0008 nm-1. These laboratory measurements from water samples were compared to CDOM concentration obtained by inverse modeling of downwelling irradiance measurements using WASI. For sensor depths lower than 1 to 1.5 m large uncertainties were observed. The measurements in 2 m depth and at Secchi disk depth yielded good correlation between water sample and WASI derived data (R^2 = 0.87) with a mean standard deviation of 0.06 m-1 for the determined CDOM concentrations. This new method is an alternative to laboratory analysis of water samples from in situ measurements of CDOM concentration.
elib-URL des Eintrags: | https://elib.dlr.de/87669/ | ||||||||||||||||||||||||
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Dokumentart: | Konferenzbeitrag (Vortrag) | ||||||||||||||||||||||||
Titel: | CDOM retrieval using measurements of downwelling irradiance | ||||||||||||||||||||||||
Autoren: |
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Datum: | 16 Oktober 2013 | ||||||||||||||||||||||||
Erschienen in: | SPIE Remote Sensing 2013 | ||||||||||||||||||||||||
Referierte Publikation: | Ja | ||||||||||||||||||||||||
Open Access: | Ja | ||||||||||||||||||||||||
Gold Open Access: | Nein | ||||||||||||||||||||||||
In SCOPUS: | Nein | ||||||||||||||||||||||||
In ISI Web of Science: | Nein | ||||||||||||||||||||||||
Band: | 8888 | ||||||||||||||||||||||||
DOI: | 10.1117/12.2031250 | ||||||||||||||||||||||||
Seitenbereich: | Seiten 1-10 | ||||||||||||||||||||||||
Name der Reihe: | Remote Sensing of the Ocean, Sea Ice, Coastal Waters, and Large Water Regions | ||||||||||||||||||||||||
Status: | veröffentlicht | ||||||||||||||||||||||||
Stichwörter: | inland waters, monitoring, water constituents, CDOM, downwelling irradiance, RAMSES sensors, inverse modeling, WASI | ||||||||||||||||||||||||
Veranstaltungstitel: | SPIE Remote Sensing 2013 | ||||||||||||||||||||||||
Veranstaltungsort: | Dresden, Deutschland | ||||||||||||||||||||||||
Veranstaltungsart: | internationale Konferenz | ||||||||||||||||||||||||
Veranstaltungsbeginn: | 23 September 2013 | ||||||||||||||||||||||||
Veranstaltungsende: | 26 September 2013 | ||||||||||||||||||||||||
Veranstalter : | SPIE | ||||||||||||||||||||||||
HGF - Forschungsbereich: | Luftfahrt, Raumfahrt und Verkehr | ||||||||||||||||||||||||
HGF - Programm: | Raumfahrt | ||||||||||||||||||||||||
HGF - Programmthema: | Erdbeobachtung | ||||||||||||||||||||||||
DLR - Schwerpunkt: | Raumfahrt | ||||||||||||||||||||||||
DLR - Forschungsgebiet: | R EO - Erdbeobachtung | ||||||||||||||||||||||||
DLR - Teilgebiet (Projekt, Vorhaben): | R - Vorhaben Spektrometrische Verfahren und Konzepte der Fernerkundung (alt) | ||||||||||||||||||||||||
Standort: | Oberpfaffenhofen | ||||||||||||||||||||||||
Institute & Einrichtungen: | Institut für Methodik der Fernerkundung > Experimentelle Verfahren | ||||||||||||||||||||||||
Hinterlegt von: | Gege, Dr.rer.nat. Peter | ||||||||||||||||||||||||
Hinterlegt am: | 22 Jan 2014 18:36 | ||||||||||||||||||||||||
Letzte Änderung: | 24 Apr 2024 19:53 |
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