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Derivation of dissolved organic carbon concentrations from SeaWiFS data

Schwarz, Jill (2005) Derivation of dissolved organic carbon concentrations from SeaWiFS data. International Journal of Remote Sensing, 26 (2), Seiten 283-293.

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Kurzfassung

Coloured dissolved organic matter (CDOM), which represents a fraction of dissolved organic carbon (DOC), contributes strongly to the absorption of blue light in Baltic waters. This makes the Baltic an ideal test site for deriving DOC concentrations from ocean colour imagery. Two hundred and five high-resolution (1.3?km) Sea-viewing Wide Field of view Sensor (SeaWiFS) images from 1998 were processed using SeaDAS and combined into monthly composites of reflectance. A simple reflectance ratio algorithm, generated from in situ data, was used to derive CDOM absorption at 440?nm (ag440) and an algorithm from the literature was applied to derive DOC concentrations, with a constant CDOM spectral slope coefficient of 0.019?nm-1 to extrapolate to the required DOC-algorithm wavelength. Monthly composites were chosen to improve the radiometric signal-to-noise ratio, given limitation of spatial and temporal coverage caused by clouds, ice and low solar illumination. Surface DOC concentrations ranged between 4?mg?l-1 and 5?mg?l-1, with elevated values in the cloudiest months (March and October). An increase in surface DOC lagged one month behind the annual cyanobacterial bloom, which peaked in July. The Gulf of Bothnia was found to have relatively high DOC concentrations in all months and comparisons with water-leaving radiance (555?nm, associated with particulate scattering) maps showed no consistent correlation between DOC and suspended particulates.

Dokumentart:Zeitschriftenbeitrag
Zusätzliche Informationen: LIDO-Berichtsjahr=2005,
Titel:Derivation of dissolved organic carbon concentrations from SeaWiFS data
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Schwarz, JillNICHT SPEZIFIZIERT
Datum:2005
Erschienen in:International Journal of Remote Sensing
Referierte Publikation:Ja
In ISI Web of Science:Ja
Band:26
Seitenbereich:Seiten 283-293
Status:veröffentlicht
Stichwörter:organic matter
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 Entwicklung und Erprobung von Verfahren zur Gewässerfernerkundung (alt)
Standort: Oberpfaffenhofen
Institute & Einrichtungen:Institut für Methodik der Fernerkundung
Hinterlegt von: Bärbel Bolowski
Hinterlegt am:23 Feb 2006
Letzte Änderung:06 Jan 2010 22:41

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