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Diurnal Variation of Air Temperature in the Atmospheric Surface Layer
Tanja Likso
Krešo Pandžić
Sažetak
In order to illustrate the nature of the diurnal temperature variations in the atmospheric surface layer in all seasons a set of hourly observations at the Zagreb-Maksimir Observatory (Croatia), measured at three different levels (5 cm, 50 cm and 2 m above ground) during the year 2005, was used. An approximate method for calculating air temperature at 5 cm, using the air temperature at 2 m, is presented. For this purpose, hourly data (screen height temperature, cloudiness, air pressure at barometer level and wind speed at 2 m) collected at the Zagreb-Maksimir Observatory during the summer season of 2005 have been used. Th is method is based on the Monin-Obukhov similarity theory. Estimated values have been compared with observations. The results obtained are the most accurate for cloudy weather, and the least accurate in the case of clear sky. A systematic error of this approach was discovered using a clustering procedure and is briefly discussed.
Ključne riječi
air temperature; atmospheric surface layer; Monin-Obukhov similarity theory
Hrčak ID:
7296
URI
Datum izdavanja:
19.12.2006.
Posjeta: 1.118 *