Weather:  Completely overcast with thick marine layer in the morning clearing by 12:00 local.  Winds calm and seas light chop during morning.  Afternoon was clear with only a thin marine haze on horizon.  A few stray clouds passed overhead of the ship during the afternoon, but none persisted for longer than a couple minutes.  Winds steady during afternoon sampling at 12-15 knots.  Waves were building to 3-4 feet by 14:00 local.  Some small white caps present.

Instrumentation used:  Sky camera system was run from 15:15 GMT – 23:30 GMT.  Images were taken in cycles that took 1 image with each appropriate spectral filter and polarizer combination.  A typical cycle took about 6 minutes to complete and cycles were started every 15 minutes.  DPOL instrument was run from 16:45 GMT – 22:15 GMT sampling downwelling light.  DPOL data was collected at the surface from 16:45 GMT – 17:45 GMT, then at 5 meters depth from 18:00 GMT – 19:00 GMT, then at 10 meters from 19:15 GMT – 20:45 GMT, then at 20 meters depth from 21:00 – 21:45 GMT, then at 30 meters from 22:00 GMT – 22:15 GMT.  Images from this instrument were taken in cycles that consisted of 1 image with each spectral filter and then that sequence was looped 5 times.  Cycles took about 12 minutes to complete and cycles were started every 15 minutes corresponding with the sky camera cycles.  Microtops sunphotometers were also taken every 15 minutes corresponding to the previous 2 instruments’ sampling schedule.  The microtops were taken from 18:45 GMT – 23:15 GMT.

Sky File Summary (Excel file)
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