thermocline rayer depth is called 200meters.
in general,around central latutude area has four seasons.exterem temperature difference is summer and winter.
in general water,chemesty h2o , vary at 0-100ﾟc.
but at very high presure,in characteristic atomosphere physical value in deep sea,
from -4ﾟc as theory.
but monitored temperature is -2ﾟc in real.
that is to say,central latutude sea area has -2ﾟc - about 26 ﾟc and so.
to another,air temperature has -5ﾟ- 37ﾟc and so on in central latutude area.
for example,in summer,sea surface is heated by air,infulenced by air.
soory but to change in topic, do you know why air conditioner device set on high wall in room?
becase in summer,temperature become low by cool wind, in general cool air is weigh to hot air in comparision.so cool air go down and hot air go up into empty space in alternative in gradually.
the reason is effective mixed in air by placed air conditioner at high area in room.economically .
why in winter to reverse?
but becase air conditioner device has ability to warm in room in all.
for example,my ural father house is not narrow.air conditioner has not able to warm in room all and high in economically cost in winter,he use stove souced barning oil in placed in horizontally.
its no nessessary to warm in high area in room,nobody in.
just likely to sea surface.
seasurface replaced top of room.
in summer, air warm seasurface.but warmed ocean is not weigh to low layer.in baisically sea surface is warmed only and not transport warm water to low layer.surface mixed layer is thick.
in winter,you may be understand it.
i tired in using english.
good bye to your best.