In the areas where lakes cover significant part of surface, they can represent an important climate factor. The reason is bigger thermal inertia of water bodies compared to land surface respectively heat-active soil layer has lower thermal inertia than water column, so it warms up and cools down faster. As a result, water surfaces are crucial for heating the planet, storing solar energy and distributing heat around the surroundings. The result is a smaller temperature amplitude of the bypass areas, compared to distant and areas without water bodies. In term paper, we presented the impact of Bohinj lake on air temperature in the surrounding area and their mutual co-operation and formation of the local climate. With thermo buttons, we have daily measured air and water temperature at five selected locations over four different periods in 2018. The obtained temperature variations were compared with different periods and locations of the measurements.
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