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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), pp. 283-293.

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Abstract

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.

Document Type:Article
Additional Information: LIDO-Berichtsjahr=2005,
Title:Derivation of dissolved organic carbon concentrations from SeaWiFS data
Authors:
AuthorsInstitution or Email of Authors
Schwarz, JillUNSPECIFIED
Date:2005
Journal or Publication Title:International Journal of Remote Sensing
Refereed publication:Yes
In ISI Web of Science:Yes
Volume:26
Page Range:pp. 283-293
Status:Published
Keywords:organic matter
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):W - Vorhaben Entwicklung und Erprobung von Verfahren zur Gewässerfernerkundung (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Remote Sensing Technology Institute
Deposited By: Bärbel Bolowski
Deposited On:23 Feb 2006
Last Modified:06 Jan 2010 22:41

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