Global radiation and albedo in the radiation system of Lake Balaton
Keywords:
albedo, Balaton, global radiation, reflected radiation, Keszthely BayAbstract
The values of global radiation and albedo measured above Lake Balaton between July 2007 and August 2008 were examined and that was compared with the global radiation measured above the standard meteorological station of Keszthely. Different intensity of global radiation was found above the shore and above the water at the same elevation of the Sun. At low elevations the global radiation is higher above the shore while at solar elevation beyond 40° it is higher above the water. In 90% of the examined period the values of albedo measured in the morning differed from that measured in the afternoon at the same elevations. The difference increases with the decrease of solar elevation. In summertime until the middle of September the albedo measured in the morning is regularly higher than that measured in the afternoon. From the middle of October the values measured in the afternoon are higher. The mean albedo of the Lake Balaton is the smallest in June: 3–5%, thereafter it rises gradually. The mean albedo was 6.8% at Keszthely Bay, in the course of our investigation.
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