Changes in downwelling photosynthetic active radiation (PAR) and spectral composition of the underwater light in different depths in the Gulf of Aqaba off the Interuniversity Institute in Eilat on the 29th October 2015.

(a) Percentage of PAR at various depths expressed as % of surface PAR (1400 μmol*m-2*s-1). The inset shows the values for mesophotic depths. (b) Depth-dependent changes in spectral irradiance.