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| Titel |
New algorithm for simultaneous retrieval of aerosols and marine parameters in coastal waters |
| VerfasserIn |
K. Stamnes, W. Li, Y. Fan, B. Hamre, O. Frette, A. Folkestad, K. Sørensen, J. J. Stamnes |
| Konferenz |
EGU General Assembly 2012
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 14 (2012) |
| Datensatznummer |
250061425
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| Zusammenfassung |
| We present simultaneous retrievals of aerosol and marine parameters in coastal waters from ocean color data using a new inversion algorithm, Ocean Color: Simultaneous Marine and Aerosol Retrieval Tool (OC-SMART). The OC-SMART algorithm uses a one-step nonlinear optimal estimation/Levenberg-Marquardt method instead of the traditional two-step look-up table approach to improve retrieval accuracy, and a radial basis function neural network (RBF-NN) to replace the forward radiative transfer model for the coupled atmosphere-water system and thereby increase retrieval speed without loss of accuracy. Previous results have shown that the retrieval speed of OC-SMART was increased by a factor of about 1,500 due to the RBF-NN training. We will discuss applications of OC-SMART to analyze SeaWiFS. MERIS, and MODIS images obtained over coastal waters. Five parameters are obtained from the retrieval: aerosol optical depth, aerosol bi-modal fraction, chlorophyll concentration, CDOM absorption, and backscattering coefficient. The water leaving radiance is provided as a by-product. The retrieval results will be compared with in situ and match-up data as well as with retrieval results obtained from the standard MERIS algorithm or produced by the SeaDAS software package. |
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