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Ocean colour algorithms from the Case 2 waters of the Irish Sea in comparison to algorithms from Case 1 waters

1986; Elsevier BV; Volume: 5; Issue: 3 Linguagem: Inglês

10.1016/0278-4343(86)90005-1

1873-6955

E. G. Mitchelson, N.J. Jacob, John H. Simpson,

Coastal and Marine Management

In situ measurements of upwelling irradiance were made using a four-channel submersible irradiance meter with similar optical characteristics to the visible channels of the Coastal Zone Color Scanner (CZCS). Concentrations of total pigments, yellow substance and total seston were sampled in parallel with the optical data. Sea-truth data were collected in the Irish Sea, which is considered to be Case 2 waters and, for comparison, in Case 1 waters off the west coast of Scotland, and off the Isles of Ushant, Brittany. Analyses showed that pigment concentration is the dominant factor affecting the colour ratios of upwelling irradiances. Statistical comparison of the algorithms relating the logarithms of E11(440)/E11(550) to total pigment concentration, C, derived for each cruise in Case 2 waters, indicated that the regression coefficients were not significantly different. Similarly those found for data collected in Case 1 waters were not significantly different from cruise to cruise, nor from those of other investigators. However, there was a significant difference between the slopes for Case 1 and Case 2 waters, enabling two general algorithms to be formed.