Document Type : Original Article
Authors
1 Department of Irrigation and Reclamation Engineering, Faculty of Agriculture, College of Agriculture and Natural Resources, University of Tehran, Karaj, Iran
2 Associate Prof., Irrigation & Reclamation Engrg. Dept. University of Tehran Karaj, Iran.
Abstract
Teleconnection, the large-scale patterns of climate change that link distant regions, has long been recognized as an important factor in understanding and predicting weather patterns around the world. In Iran, these teleconnections have been shown to significantly affect the distribution and variability of rainfall, cloudiness, and temperature as a key driver affecting the region. One of the most important links in this field is the large-scale index of several decades’ atlas. In this research, the climatic component of cloudiness and the effects of several decades of the Atlas index on it have been analyzed. With the method of Principal Components Analysis, the climatic component of cloudiness and the effect of 12 teleconnections have been investigated and analyzed. that the greatest effect is obtained from the index of several decades of atlas. The highest percentage of correlation is calculated from Karaj station located in the western Alborz slopes and is -0.65%. Stations in the western and southwestern regions showed the highest percentage of correlation between the cloudiness parameter and the aforementioned index, followed by the central and southern regions. In general, the positive phase of the index will cause a decrease in cloudiness in the western and central regions of Iran, and the negative phase of the index will cause an increase in cloudiness in the mentioned areas. It is recommended to consider climate change and global warming in future studies.
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