Study sites and dates of measurements.

Information on ozone layer (based on OMPS; OMI for Valdivia March 2014; http://ozoneaq.gsfc.nasa.gov/tools/ozonemap/), solar zenith angle (SZA; calculated according to NOAA http://www.esrl.noaa.gov/gmd/grad/solcalc/; times of measurements given in S2 Data), total depth (based on echosounder, in deeper sites on bathymetric data by NOAA https://maps.ngdc.noaa.gov/viewers/bathymetry/), euphotic zone (z1%PAR based on determined Kd values) and the number of measured profiles (n) are also given. NA = Not available.