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Optical transparency chlorophyll and primary productivity in the eastern mediterranean near the israeli coast


, : Optical transparency chlorophyll and primary productivity in the eastern mediterranean near the israeli coast. Oceanologica Acta 7(3): 367-372

For the first time, quantitative data on optical characteristics, chlorophyll standing crops and primary production are given for the pelagic waters of the Levant Basin in the Eastern Mediterranean, close to the Israeli coast. During 4 cruises (July, Dec. 1981, April, July 1982) Secchi depths ranging from 33-46 m, diffuse downwelling attenuation coefficients from 0.031 to 0.046 m-1, near-surface chlorophylls from 0.026 to 0.069 .mu.g l-1 and photosynthetic rates from 1.62 to 9.79 mg C m-2 h-1 were measured. Images from the Coastal Zone Color Scanner on board the Nimbus 7 Satellite confirmed that these low chlorophyll concentrations were characteristic for the pelagic region and suggested that mixing with the neritic waters may occur in winter. The majority of chlorophyll and primary productivity was associated with organisms < 3 .mu.m. Deep chlorophyll maxima (75-125 m) were observed at all pelagic stations. These waters are among the most oligotrophic described.

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