Entropy flux through the oceanatmosphere boundary as an integral indicator of the ocean climate change

Climatic trend of the entropy flux across the water-air boundary is determined for the oceanographic section along 180o meridian in the Pacific Ocean. The flux is calculated on the average annual data for SST and components of heat balance with 4-degree spatial resolution for 1979–2024. The flux is negative with the value ~3 . 10 –2 W/m 2 K and has a tendency toward zero. Mean rate of the turbulent energy dissipation per unit mass is evaluated as ~2.10 –7 m 2 /s 3 . Different trends in thermal conditions for the «closed» and «open» polar areas in the Southern and Northern Hemispheres, respectively, are discussed. Possible feedback of the parameters toward climate stability is noted: the lower the entropy flux, the weaker water dynamics, and the higher SST difference between tropical and polar zones, that leads to reverse process of increasing the entropy flux and returns the ocean back to its previous stationary state.