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Abstract

The optical properties of water bodies are important for the calibration of algorithms, based on remotely sensed data and computing quantitatively chlorophyll content. This paper describes two different instruments, one for the determination of underwater downwelling and upwelling radiation, one for the measurement of the water-leaving radiance. The immersible instrument allows the determination of the light attenuation coefficient k and the reflectance R, as a function of depth for four different wavelengths, corresponding to the CZCS channels. Water-leaving radiance is measured in 256 channels in the range of 380--1100 nm. The high resolution constitutes the latest state of the art of new radiometer technology. Both narrow band measurements of single channels and integration of measurements over selected ranges are possible. This paper describes the instruments and shows examples of different water bodies. The obtained results are confronted with "it in situ/" data of chlorophyll. Optical "it in situ/" data are in good agreement with analytical results of chlorophyll determination.

Additional information

Authors: MARACCI G, JRC ISPRA ESTAB. (ITALY);OOMS M JRC ISPRA ESTAB. (ITALY), JRC ISPRA ESTAB. (ITALY)
Bibliographic Reference: IGARSS'88, EDINBURGH (SCOTLAND), SEPT. 13-16, 1988, AVAILABILITY: CEC-LUXEMBOURG, DG-XIII-C-3, POB 1907, MENTIONING PAPER EN 34183 ORA
Availability: Can be ordered online
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