An example of one day of radiometer data from the SAS system on the ASIT tower. Diurnal incident PAR and spectral irradiance (top two plots) indicate a cloud-free day. Water-leaving spectral radiances (bottom two plots) contain variability due not only to the incident solar radiation but also physiological factors in the photosynthetic apparatus of phytoplankton, optical properties of the water column, geometrical issues with the observations, and sea state. Separating these various controls on sun-stimulated fluorescence is extremely difficult without making these measurements in conjunction with other ocean properties currently monitored by instrumentation on the ASIT.



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Last updated April 17, 2011
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