نوع مقاله : مقاله پژوهشی
نویسندگان
1 استاد اقلیم شناسی، دانشکده علوم انسانی، دانشگاه زنجان، زنجان
2 دانشجوی دکتری تغییرات آب و هوایی/دانشگاه زنجان، زنجان، ایران
چکیده
کلیدواژهها
موضوعات
عنوان مقاله [English]
نویسندگان [English]
In current research, attempts was made to analyze the hidden aspects of precipitation in the Caspian region. To this end, the daily data of 385 stations, under Meteorological Organization and the Ministry of Energy's supervision was used for the period of 2016-1966 (51 years). These stations were used in order to create maps with a spatial resolution of 3 × 3 km. Sinusoidal behaviors of monthly Precipitation in each map's pixels were investigated. Accordingly, first to sixth harmonics were extracted. Finally, to identify the spatial patterns of precipitation based on the contribution of different periodic and its zoning, the cluster analysis method was used based on the Euclidean distance and the "Ward" method of linkage. The results showed that large-scale systems, and local factors such as the Alborz Mountains, the Caspian Sea have led to different patterns of atmospheric precipitation. The largest share of precipitation from large scale systems in the southwest of the Caspian Sea and the eastern region and the highest share of local precipitation in the Alborz highlands is seen. This suggests that precipitation is concentrated in the coastal and southwest parts of the Caspian Sea and east of the region, and is less concentrated in the Alborz highlands. The results of cluster analysis indicate that in the Caspian region three classes of distinct precipitation diffraction can be identified. The geographical dispersion of these classes shows that the difference between these classes is affected by latitude and distance from the Caspian Sea.
کلیدواژهها [English]
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