Spatial-temporality modeling of albedo in the scope of Iran

چکیده مقاله

This study, to model the temporal-spatial changes of Albedo using the simultaneous effect of several components such as: soil surface layer moisture (Wetness), cloudiness, supernatural topography and vegetation density, using Model MEERA2, with a power of fifty by fifty kilometers, in the years 2000 to 2010 has been done in Iran.The results of spatial analysis of albedo values ​​in Iran showed that the highest amount of reflection, during the longitude of 44 to 45 degrees east, 2.8 to 3.3 and the lowest amount of reflection between 52 to 53 degrees east, ie the eastern slopes of the Zagros Mountains, 1 to 1.5 units are recorded. Provincially, the highest reflection, 0.25 units, is related to Ilam province and then 0.24 units is related to Fars province. The lowest amount of albedo is allocated to Gilan and Mazandaran provinces with 0.17 and 0.19 units, respectively. Also, the results of seasonal time scale analysis showed that the highest amount of albedo in Iran, in winter, was 0.26 units and the minimum amount of reflection in spring was 0.23 units. In general, according to the factors used, it can be said that the western and central regions of the country have the most, and the northern and northwestern regions of Iran have the least albedo.