I asked this question not long ago.   See:

http://www.last-word.com/content_handling/show_tree/tree_id/3122.html

I suggest that since the sun was responsible for the waves

by direct radiation;, that  the energy will be returned to the

water as heat.  Hard to measure. How about the energy given

to the sidewalk as you jog along? easier to measure.  The world

recycles energy in many ways; my pet one is that we use fossil

fuel that came from the sun to make air conditioners work to

negate the warmth we have millions of years later.  OOPs,

shouldn't use 'negate', just moves the warmth from inside the

house to the outside, generating more heat in the process.