Geography and Human Relationships

Geography and Human Relationships

Synoptic analysis of humidity anomalies especially in wet autumns in northwestern Iran

Document Type : Original Article

Authors
mohammad mirzaie 1
Karim Aminina 2
Ali Panahi 3
Abolfazl Hammetzadeh 4
1 Deputy / Environmental Protection Department of Meshginshahr, Iran
2 Department of Geography, Ahar Branch, Islamic Azad University, Ahar, Iran
3 Department of Geography, Tabriz Branch, Islamic Azad University, Tabriz, Iran
4 Senior expert on rangeland and watershed management of Meshkin Shahr Environmental Protection Department
10.22034/gahr.2024.448987.2074
Abstract
Precipitation is one of the elements of climate, any increase or decrease of which affects all atmospheric-climatic and environmental factors. In order to analyze and analyze the occurrence of wet autumns in northwest Iran, the monthly rainfall statistics of 15 synoptic stations during the statistical period of 1987-2016 were received from the Meteorological Organization. In order to identify and separate the wet autumn seasons, the standard precipitation index was used, then the seasonal data of 500 and 700 hectopascals at the coordinates of 10 to 75 degrees east longitude and 20 to 70 degrees north latitude in wet periods were obtained from the total reconstructed data of the NCEP/NCAR website And Was investigated. The results showed that the frequency of occurrence of normal and fearful conditions in mild and moderate intensities occurs more in the region. The negative anomalies caused by the decrease in height at the level of 500 hectopascals over the region and the strong positive anomalies over central to northern Europe are the most important causes of wet autumn in the region. Also, at the level of 700 hectopascals, there are positive anomalies indicating the activity of Sudanese and Mediterranean low pressure on the earth's surface compared to the long-term sources of moisture supply. Also, Sudanese low pressure systems and combined Sudanese-Mediterranean low pressure systems play a prominent role in moisture transfer. to the study area.
Keywords
Synoptic analysis
Specific humidity anomalies
Hof-Mueller diagram
wet autumns
northwest

Subjects

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Geography and Human Relationships
Volume 7, Issue 3 - Serial Number 27
Winter 2025
Pages 205-228

  • Receive Date 18 March 2024
  • Revise Date 17 January 2025
  • Accept Date 10 May 2024