The Study of the Impact of Temperature and Wind In the Southern Low Pressure Systems
This research aims to study the impact of temperature and wind in the southern low-pressure system and its associated precipitation in the southern regions of Iran. As The southern low pressure system moves eastward, it crosses the southern regions of Iran, causing medium and heavy rainfall in these...
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| Language: | fas |
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Kharazmi University
2020-06-01
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| Series: | تحقیقات کاربردی علوم جغرافیایی |
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| Online Access: | http://jgs.khu.ac.ir/article-1-3205-en.pdf |
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| author | mahboobeh pouratashi mohammad moradi ebrahim fattahi |
| author_facet | mahboobeh pouratashi mohammad moradi ebrahim fattahi |
| author_sort | mahboobeh pouratashi |
| collection | DOAJ |
| description | This research aims to study the impact of temperature and wind in the southern low-pressure system and its associated precipitation in the southern regions of Iran. As The southern low pressure system moves eastward, it crosses the southern regions of Iran, causing medium and heavy rainfall in these areas. In this study, two southern low-pressure systems that caused heavy rainfall on March 11, 2015 and January 17, 2000 in southern Iran were selected, analyzed and simulated using the numerical Weather Research and Forecasting (WRF) model. Since the wind and temperature fields play a significant role in the southern low-pressure systems, four experiments were performed for investigating the effects of temperature and wind on the intensification and weakening of the southern system. The simulation results showed that the simulation for the increased (decreased) temperature caused the weakened (intensified) the southern low pressure in the studied area. This result showed that the vertical structure of the southern low-pressure and its physical characteristics are similar to the mid-latitudes cyclones, and these systems were different from the thermal low pressures. The results of wind speed changes showed that the increased (decreased) wind speed simulation caused an increase (decrease) in relative vorticity, thus the southern low pressure was intensified (weakened). In both cases, the rainfall was decreased by the increased temperature simulation, and decreased temperature caused an increase in rainfall. It was also seen that the increase in wind speed caused the special humidity advection to be increased and then the rainfall increased. Also the amount of rainfall decreased when conditions did not provide for the advection of specific humidity or the wind speed reduced. |
| format | Article |
| id | doaj-art-70f5cce7a9be4cfea6da8869e3ae7694 |
| institution | Kabale University |
| issn | 2228-7736 2588-5138 |
| language | fas |
| publishDate | 2020-06-01 |
| publisher | Kharazmi University |
| record_format | Article |
| series | تحقیقات کاربردی علوم جغرافیایی |
| spelling | doaj-art-70f5cce7a9be4cfea6da8869e3ae76942025-01-31T17:26:51ZfasKharazmi Universityتحقیقات کاربردی علوم جغرافیایی2228-77362588-51382020-06-012057223241The Study of the Impact of Temperature and Wind In the Southern Low Pressure Systemsmahboobeh pouratashi0mohammad moradi1ebrahim fattahi2 ASMERC ASMERC ASMERC This research aims to study the impact of temperature and wind in the southern low-pressure system and its associated precipitation in the southern regions of Iran. As The southern low pressure system moves eastward, it crosses the southern regions of Iran, causing medium and heavy rainfall in these areas. In this study, two southern low-pressure systems that caused heavy rainfall on March 11, 2015 and January 17, 2000 in southern Iran were selected, analyzed and simulated using the numerical Weather Research and Forecasting (WRF) model. Since the wind and temperature fields play a significant role in the southern low-pressure systems, four experiments were performed for investigating the effects of temperature and wind on the intensification and weakening of the southern system. The simulation results showed that the simulation for the increased (decreased) temperature caused the weakened (intensified) the southern low pressure in the studied area. This result showed that the vertical structure of the southern low-pressure and its physical characteristics are similar to the mid-latitudes cyclones, and these systems were different from the thermal low pressures. The results of wind speed changes showed that the increased (decreased) wind speed simulation caused an increase (decrease) in relative vorticity, thus the southern low pressure was intensified (weakened). In both cases, the rainfall was decreased by the increased temperature simulation, and decreased temperature caused an increase in rainfall. It was also seen that the increase in wind speed caused the special humidity advection to be increased and then the rainfall increased. Also the amount of rainfall decreased when conditions did not provide for the advection of specific humidity or the wind speed reduced.http://jgs.khu.ac.ir/article-1-3205-en.pdfheavy rainfallsouthern low pressurewrf modelsouth and southwest of iransouthern cyclone |
| spellingShingle | mahboobeh pouratashi mohammad moradi ebrahim fattahi The Study of the Impact of Temperature and Wind In the Southern Low Pressure Systems تحقیقات کاربردی علوم جغرافیایی heavy rainfall southern low pressure wrf model south and southwest of iran southern cyclone |
| title | The Study of the Impact of Temperature and Wind In the Southern Low Pressure Systems |
| title_full | The Study of the Impact of Temperature and Wind In the Southern Low Pressure Systems |
| title_fullStr | The Study of the Impact of Temperature and Wind In the Southern Low Pressure Systems |
| title_full_unstemmed | The Study of the Impact of Temperature and Wind In the Southern Low Pressure Systems |
| title_short | The Study of the Impact of Temperature and Wind In the Southern Low Pressure Systems |
| title_sort | study of the impact of temperature and wind in the southern low pressure systems |
| topic | heavy rainfall southern low pressure wrf model south and southwest of iran southern cyclone |
| url | http://jgs.khu.ac.ir/article-1-3205-en.pdf |
| work_keys_str_mv | AT mahboobehpouratashi thestudyoftheimpactoftemperatureandwindinthesouthernlowpressuresystems AT mohammadmoradi thestudyoftheimpactoftemperatureandwindinthesouthernlowpressuresystems AT ebrahimfattahi thestudyoftheimpactoftemperatureandwindinthesouthernlowpressuresystems AT mahboobehpouratashi studyoftheimpactoftemperatureandwindinthesouthernlowpressuresystems AT mohammadmoradi studyoftheimpactoftemperatureandwindinthesouthernlowpressuresystems AT ebrahimfattahi studyoftheimpactoftemperatureandwindinthesouthernlowpressuresystems |