MODIS CDOM and chlorophyll: a first look using SeaWiFS and AVHRR data

Steven K. Hawes; Kendall L. Carder; Robert H. Evans

doi:10.1117/12.494221

15 November 2000 MODIS CDOM and chlorophyll: a first look using SeaWiFS and AVHRR data

Steven K. Hawes, Kendall L. Carder, Robert H. Evans

Proceedings Volume 4135, Earth Observing Systems V; (2000) https://doi.org/10.1117/12.494221
Event: International Symposium on Optical Science and Technology, 2000, San Diego, CA, United States

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.

Citation Download Citation

Steven K. Hawes, Kendall L. Carder, and Robert H. Evans "MODIS CDOM and chlorophyll: a first look using SeaWiFS and AVHRR data", Proc. SPIE 4135, Earth Observing Systems V, (15 November 2000); https://doi.org/10.1117/12.494221

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