mamooth
Diamond Member
This happens in the first ten microns of the surface of the oceans..
Let's go over the basics, because you really need the lesson.
This is the temperature profile of most spots in the ocean. Note the vertical scale is sort of logarithmic.

The bulk of solar energy penetrates deeply and warms the water. Convection causes warmer water to rise, so the oceans get warmer as you get shallower.
However, that trend reverses at the skin layer. The atmosphere is usually colder than the ocean below, so the ocean at the surface loses heat to the cooler atmosphere, which lowers the temperature of the skin layer by about 1C.
The amount of heat flowing out the oceans, from combined conduction and evaporation, depends on the delta-T across that skin layer. Heat conducts from hot to cold, linearly proportionally to the temperature difference. With more of a temperature gradient, more heat flows out of the oceans. Less of a gradient, less outflow.
Enter the IR radiation. It heats the skin layer, decreasing the delta-T across the skin layer, so less heat flows out of the oceans. The IR doesn't heat the deeper ocean directly. It reduces the heat flow out of the deeper ocean, so more heat stays in the deeper ocean, so the IR indirectly warms the deeper ocean.
Note that the skin layer is _not_ evaporating away and instantly shedding the backradiation energy. An 0.3C temperature rise is not enough to make the skin layer boil. It is enough to significantly reduce heat flow out of the oceans.

3rd ERS Symposium - Earth Online
The ESA Directorate for Observation of the Earth and its Environment held the 3rd ERS Symposium, in 1997, where many of the results from the ERS-1 and ERS-2 missions were presented and discussed by the scientific community.
Studies of the bulk-skin temperature difference (the "skin effect") show that it has a typical daytime value of 0.3 K (Schlussel, 1990) for high latitudes.
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