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Mostafa Karampour, Yeganeh Khamoshian Sahneh, Zohreh Ebrahimi, Hamed Heidari,
Volume 0, Issue 0 (3-1921)
Abstract

In recent years, much attention has been allocated to the study of atmospheric rivers because atmospheric rivers are massive carriers of moisture from remote areas. In this study, atmospheric rivers were studied for Iran and the neighboring countries in terms of their source of formation and their relationship and correlation with the NAO index. To study them the 1994 to 2019 data of various climatic elements such as Vwind, Function wind, NAO,, wind Shum, Meridonal wind were used. The results showed that during the study period, the ARs direction became more southerly, and jet streams played a major role in producing and determining the direction of river flow. Jetstream performance can also be used to determine the potential of an area in identifying atmospheric rivers. The highest correlation of the Transatlantic Transplant Index is with the tidal currents at the levels of 500 and 400. If the pressure centers are located in the southern part of the atmospheric rivers and the jet streams reach the eastern regions about 60 degrees, the length of the atmospheric rivers will reach more than 12,000 kilometers and  affect the eastern regions of Iran to Pakistan, Bangladesh and Afghanistan.

Daryosh Yarahmdi, Asadollah Khoshkish, Mustafa Karampour, Ismail Ahmadi,
Volume 16, Issue 40 (3-2016)
Abstract

One of the Siberian high pressure system is the Earth climate system, atmospheric important. The purpose of this study, analysis of core changes Siberian high pressure system in the period mentioned. To identify the core spatial variations in the timeframe mentioned data, daily sea level pressure and temperature of the earth's surface with a resolution of 2.5 degrees within the space of 30 to 65 degrees north latitude and 130 degrees east longitude from the database 45 to NOAA NCEP / NCAR for the cold was extracted. The core of the GIS spatial data analysis system and two separate zones and point to output six decades was ten years old and were analyzed. To study the process of change, determine the direction of the trend, type and timing of changes in temperature and pressure of the core of the system the test of Mann-Kendal is used. Comparison between the first and sixth decades 60-year period showed that the core in January from the East to the West and in October and March from the North East to the South West from the Balkhash Lake to Baikal there has been a significant shift. Results also showed that during the same period the Siberian High central pressure was reduced in January while the land surface temperatures in January showed a significant upward trend. Unlike the months of October and January, in March the central pressure had few mutations but no trend was observed. However, during this month the Earth's surface temperature has increased significantly during thementioned period.



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