Synoptic patterns

Open Access Article

1 - Study the main synoptic sea level pressure In freezing frost of Kermanshah province
ali hassanzadeh hooshmand ataee nader parvin amir gandomkar

Agricultural crops have damaged a lot due to the aftermath of late spring frost, and because low temperatures have damaging effects on agricultural production, it is essential to anticipate and prevent potential damages. Often, atmospheric temperatures variations are ve More

Agricultural crops have damaged a lot due to the aftermath of late spring frost, and because low temperatures have damaging effects on agricultural production, it is essential to anticipate and prevent potential damages. Often, atmospheric temperatures variations are very urgent due to the ightemperature of the systems and the plants can not adapting themselves with severe oscillations and,consequently, have been damaged. identifying the sea level equations and the late spring freezing frost of the period from 1990 to 2015. This analyze has been done to determine the times of the freezing phenomenon, determine the minimum daily temperature of 7 stations placed in Kermanshah, Hamedan and Ilam. After analyzing the data of spring frost freezing of Kermanshah province using the main component analysis technique and hierarchical clustering method ,the most common 10 patterns of late spring coldness of the areawerestudied and determined. In 10 resulting cluster, the 8 clusters are related to the high pressure pattern of Siberia. From the total 91 days of spring frost freezing in Kermanshah province (79% (72 days)) is due to the high rainfall of Siberia, 12% (11 days) is due to the Mediterranean climate and 9% (8 days) is due to the Van lake climate. Manuscript profile

Open Access Article

2 - Synoptic patterns of the flood rains of Gorgan River
بهلول Alijani طواق Gholparnian

In order to study and identify the pressure patterns responsible for the floods of theGorgan River the dates of the sudden increase of daily discharge of the river wereextracted for each calendar month during the 1968-1998 period. For each calendarmonth one intensive an More

In order to study and identify the pressure patterns responsible for the floods of theGorgan River the dates of the sudden increase of daily discharge of the river wereextracted for each calendar month during the 1968-1998 period. For each calendarmonth one intensive and widespread flood was selected. The weather maps of thesedays at the surface and 500 hPa levels were analysed and the main pressure patternswere determined.The results showed four distinctive patterns: cyclonic, anticyclonic, warm front, andlocal cold front. The anticyclonic pattern was the most frequent one which is followedby the cyclonic pattern. Manuscript profile

Open Access Article

3 - A Survey on Synoptic Patterns of Heavy Summer Rain happening in the northern areas of Khorasan
علیرضا Bani-Vahab

In order to investigate and analyze the synoptic patterns in relation to heavysummer rain happening in the northern areas of Khorasan Province during 2001-2002,the earth surface pressure maps and the 500 mb ones were examined .The most significant patterns that were in More

In order to investigate and analyze the synoptic patterns in relation to heavysummer rain happening in the northern areas of Khorasan Province during 2001-2002,the earth surface pressure maps and the 500 mb ones were examined .The most significant patterns that were in coordination with the real flood happeningwere as follows:High pressure of the Caspian Sea, the higher atmosphere level trough, Kavir plainlow pressure, combination of polar and subtropical jet stream. Out of 18 cases understudy, 44.4 % including 8 cases, were about high pressure of the Caspian Sea andnorth flows over this sea, 27.7% including 5 cases, were concerned with higheratmosphere level trough, 11.1% including 2 cases, were related to Kavir plain lowpressure, and 16.2% including 3 cases, were due to a combination of polar andsubtropical jet stream .The patterns related to high pressure of the Caspian Sea and Kavir plain lowpressure have happened in the hottest summer days and higher atmosphere leveltrough with a combination of polar and subtropical jet stream occurred in spring . Manuscript profile

Open Access Article

4 - Analysis of Synoptic Patterns of the Two Heaviest Rainfall Events in Zayandeh Rood Dam Basin
Shahideh Dehghan Amir Gandomkar Alireza Abbasi

Precipitation is one of the most important climatic elements, and its importance increases especially when heavy rains occur. Investigating rainfall or heavy rainfall in a region requires analysis of synoptic patterns. This research was conducted with the aim of investi More

Precipitation is one of the most important climatic elements, and its importance increases especially when heavy rains occur. Investigating rainfall or heavy rainfall in a region requires analysis of synoptic patterns. This research was conducted with the aim of investigating the heavy rains in the catchment area of Zayandeh Rood Dam. For this purpose, the daily rainfall data of Kohrang, Fereydon Shahr, Shahrekord, Daran, Pol Zaman Khan, Farrokh Shahr, Chadegan and Saman stations during the statistical period of 1958-2019 were used. After examining the data, two rainfall events on 7/1/2004 and 12/3/2005, which were heavy rains (rainfall above 20 mm) in the study area, were selected and their co-occurrence patterns were analyzed. The data related to geopotential height of three levels of 500, 700 and 850 hectopascals was obtained from the NOAA site and its maps were drawn in Arc Gis software. The obtained results showed that heavy rains occur in the studied basin when cold air in higher latitudes moves to lower latitudes and obtains the necessary moisture over the Red Sea and the Mediterranean. When the trough axis is located in the eastern Mediterranean and there is a lot of humidity, it causes heavy rains in the studied area. In general, it can be stated that the heaviest rains in the studied area occur in March and the Mediterranean and Sudanese systems cause heavy rains in this area. Manuscript profile

Open Access Article

5 - Synoptic patterns leading to the occurrence of extreme high temperature in the cold period of the south coast of Iran
Soudabeh Sanadizadeh Hassan Lashkari Seyed jamaledin Daryabary

The occurrence of heatwaves, even in short time periods, can disrupt daily life and many social activities for residents. This phenomenon, when it persists for longer durations, may cause environmental and agricultural damage. The objective of this research is to extrac More

The occurrence of heatwaves, even in short time periods, can disrupt daily life and many social activities for residents. This phenomenon, when it persists for longer durations, may cause environmental and agricultural damage. The objective of this research is to extract and introduce synoptic patterns that lead to the creation of heatwaves in the southern coastal cities over the past 33 years. To achieve this goal, using the Z-score index and other selected criteria, heatwave samples were extracted for all selected stations. Based on the selected criteria, 90 heatwave samples were extracted for the 33-year statistical period. Then, using the factor analysis method and visual inspection with 1000 hPa weather data, dominant and frequent synoptic patterns were extracted. The results of this research showed that seven factors and 14 frequent patterns are the most dominant synoptic patterns that create heatwaves during the cold season in southern Iranian cities. Among these patterns, the first factor of the Sudan-Turkmenistan low-pressure pattern and, among the effective systems in creating high heatwave temperatures, the Sudan low-pressure system had the most significant role in the structure of synoptic patterns. In this pattern, the Sudan low-pressure system is combined with a northeast expansion towards the South and the warm air movement of the Hadley cell, causing an abnormal rise in temperatures at coastal stations. The core heat of this pattern is located over Sudan and Saudi Arabia. In the boundary layer to the middle troposphere, the Arabian trough rotates over the region, creating dynamic Manuscript profile

Open Access Article

6 - Numerical Analysis of surface Ozone and its relation to synoptic patterns in Tehran
Ali Afshariazad Bahman Ramezani atoosa bigdeli mohammadreza afshariazad

This research tries to assess the emission and concentration of surface Ozone related to the synoptic weather patterns in general circulation of atmosphere. 2020 – 2021 is the time and Tehran is the place of this research. Based on the defined scenarios, the extre More

This research tries to assess the emission and concentration of surface Ozone related to the synoptic weather patterns in general circulation of atmosphere. 2020 – 2021 is the time and Tehran is the place of this research. Based on the defined scenarios, the extreme emission day, the pure day accompanied with stability and instability of the atmosphere, air pressure in sea level and 500 hpa. Skew-T chart from Mehrabad airport were analyzed. The emission datum was taken from the six stations of the air quality control organization in Tehran. The analysis was done daily and seasonally. The result of the research shows that in 24 hours emissions the most concentration happens in the mid-day and last until 6 in the evening. Among the seasons, summer has the most concentration because of the dominance of high pressure in atmosphere, increase in surface temperature high radiation and wind speed. More than 6 m Manuscript profile

List of Articles Synoptic patterns

Sanad

Links

Related Centers

Technical Support

Official pages