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The vertically generalized production model (VGPM), which was designed for open ocean waters (Behrenfeld and Falkowski, 1997), was evaluated using in situ measurements of primary productivity (PP) in the characteristically turbid coastal waters of Khure-Mussa, in northwest Persian Gulf, to develop a regionally modified version of the model. The euphotic depth (Zeu)-integrated PP (IPP) calculated from the VGPM using in situ chlorophyll a (Chla), sea surface temperature (SST) and Zeu was significantly underestimated ,but 59% of the observed variability was explained. The weak correlation could have partially resulted from overestimations by the sub-models embedded in the original VGPM model for estimation of Zeu (Morel and Berthon, 1989) and the optimal Chla-normalized PP (P B opt). Chla was the most important parameter influencing the modeled IPP variation in Khure-Mussa. The modeled and in situ P B opt were weakly correlated. This NPP model for the Khure-Mussa incorporates an improved prediction of the P B opt, as a function of sea surface temperature (SST). The estimation of Chla was improved by optimizing the Chla algorithm with in situ Rrs data. The daily average of primary productivity in the whole Khure-Mussa was 0.63 gcm -2 d -1 . Thus, even though the VGPM is a global open ocean model, when coupled with turbid water algorithms for Zeu and Chla and modeled P B opt, it provided realistic estimates of IPP in the turbid water ecosystem of Khure-Mussa.

SATELLITE-DERIVED PRIMARY PRODUCTIVITY AND ITS SPATIAL AND TEMPORAL VARIABILITY IN THE KHUREMUSSA (NORTHWEST PERSIAN GULF)