When using in‐situ methods such as the use of spectrometers aboard a ship, aircraft or satellites to estimate suspended matter (especially phytoplankton concentrations) in waters it is necessary to know the corresponding correlations between the matter concerned and the spectral reflectance R(Λ) or colour indices R(Λi)/R(Λj). Therefore, ship‐borne experiments were carried out on mesotrophic and eutrophic waters. The following parameters were measured: reflectance at the wavelengths 450, 550, 670, 705 nm, Secchidisk transparency, chlorophyll‐a concentration, fluorescence, extinction, and scattering. Significant correlations (0.92<r2<0.99) were found between chlorophyll‐a concentration (10 to 360 μg/l) and the reflectance ratios R(705)/(670), R(705)/R(550), (R(705) ‐R(670))/R(550). At these concentrations the estimation of chlorophyll‐a by means of R(705)/R(670) appears to be more accurate than by the fluorescence method. When developing methods for estimating seston concentrations the use of R(705) is recommended.
|Original language||English (US)|
|Number of pages||12|
|Journal||Internationale Revue der gesamten Hydrobiologie und Hydrographie|
|State||Published - 1988|
- chlorophyll a
ASJC Scopus subject areas
- Agricultural and Biological Sciences(all)