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Proceedings Paper

MODIS CDOM and chlorophyll: a first look using SeaWiFS and AVHRR data
Author(s): Steven K. Hawes; Kendall L. Carder; Robert H. Evans
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Paper Abstract

Global maps of MODIS pigment products were produced using SeaWiFS and AVHRR data from 2 and 3 July 1998. The global mode value for the Case 2 chlorophyll product is 0.075 mg m-3, while global modes for two empirical chlorophyll algorithms are 0.02 to 0.03 mg m-3 higher. The Case 2 chlorophyll product shows a pronounced bimodal distribution with a secondary mode at around 0.30 mg m-3, which is consistent with high-latitude in situ pigment concentration data from the Southern Ocean. Analysis of spectral ratios of Rrs suggests that the 412 nm channel of SeaWiFS may be 1.5-2.0% too low. Blue-absorbing aerosols are not correctly removed from the imagery of the Mediterranean Sea, causing erroneously high retrievals of gelbstoff (or CDOM) absorption coefficient. A numerical filter to diagnose the presence of Saharan dust is suggested.

Paper Details

Date Published: 15 November 2000
PDF: 8 pages
Proc. SPIE 4135, Earth Observing Systems V, (15 November 2000); doi: 10.1117/12.494221
Show Author Affiliations
Steven K. Hawes, Univ. of South Florida (United States)
Kendall L. Carder, Univ. of South Florida (United States)
Robert H. Evans, Univ. of Miami (United States)


Published in SPIE Proceedings Vol. 4135:
Earth Observing Systems V
William L. Barnes, Editor(s)

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