This is expected since the air and surface waters approach thermal equilibrium.
These bodies are said to be in thermal equilibrium.
After a certain point you cannot bond and during this time your thermal equilibrium is reached.
The temperature T arises from the fact that the system is in thermal equilibrium with its environment.
This is not true, as the law only applies in thermal equilibrium.
One sense is that of thermal equilibrium within a system for itself.
While the transfer of energy as heat continues, the system is not in thermal equilibrium.
At that point the net flow of energy is zero, and the systems are said to be in thermal equilibrium.
But, as Albert might have said, thermal equilibrium was maintained.
Thus, on a very practical basis, there is no way to keep the two gas samples from thermal equilibrium.