Investigating the RegCM model ability in simulation of summer Khorasan dust
The Great Khorasan in northeast Iran has a variety of surface structures and plains and high peaks, but due to its vicinity to the deserts of Afghanistan and Turkmenistan, it is affected by dust all the time, especially in summer. The purpose of this study was to simulate summer dust in this region...
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Kharazmi University
2023-12-01
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| Series: | تحقیقات کاربردی علوم جغرافیایی |
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| Online Access: | http://jgs.khu.ac.ir/article-1-3627-en.pdf |
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| author | Elham Mobarak Hassan Ebrahim Fatahi Abass Ranjbar Saadat Abadi Nasim Hossein Hamzeh |
| author_facet | Elham Mobarak Hassan Ebrahim Fatahi Abass Ranjbar Saadat Abadi Nasim Hossein Hamzeh |
| author_sort | Elham Mobarak Hassan |
| collection | DOAJ |
| description | The Great Khorasan in northeast Iran has a variety of surface structures and plains and high peaks, but due to its vicinity to the deserts of Afghanistan and Turkmenistan, it is affected by dust all the time, especially in summer. The purpose of this study was to simulate summer dust in this region by RegCM model. For this purpose, during the period 2000 to 2017, three extreme dust events were selected. The satellite image used to confirmed dust mass presence and then the synoptic structure was analyzed. Finally, the simulation results of RegCM 4.6 model were compared with the observational data including the horizontal visibility and aerosol optical depth (AOD) of Aqua satellite. The synoptic analysis showed that during the summer, low thermal pressures form in the southern Afghanistan and high pressure in the north. This structure lead to the development of north and northeast winds with speeds of 12 to 21 m / s and dust emission on the eastern border of Iran and western Afghanistan. Investigation of RegCM accuracy done by visibility, Aquas’s AOD showed that model performance in South Khorasan is better as Razavi Khorasan. The highest correlation coefficients of AOD of model and horizontal visibility were obtained at Khorasan central stations including Gonabad, Ferdows, Nahaband and Ghaen at -0.82, -0.77 and -0.44 respectively. RegCM model performed a better dust simulation in severe dust with a horizontal visibility down to less than 1000 m, high continuity and horizontal extension. Overall, the RegCM model underestimates the AOD value for the Aqua satellite algorithm. |
| format | Article |
| id | doaj-art-1378a948efc548388f1c29f77fce9e4c |
| institution | Kabale University |
| issn | 2228-7736 2588-5138 |
| language | fas |
| publishDate | 2023-12-01 |
| publisher | Kharazmi University |
| record_format | Article |
| series | تحقیقات کاربردی علوم جغرافیایی |
| spelling | doaj-art-1378a948efc548388f1c29f77fce9e4c2025-01-31T17:30:33ZfasKharazmi Universityتحقیقات کاربردی علوم جغرافیایی2228-77362588-51382023-12-0123713959Investigating the RegCM model ability in simulation of summer Khorasan dust Elham Mobarak Hassan0Ebrahim Fatahi1Abass Ranjbar Saadat Abadi2Nasim Hossein Hamzeh3 Assistant Professor, Department of Environment, Ahvaz Branch, Islamic Azad University, Ahvaz, Iran Associate Professor, Atmospheric Science and Metrological Research Center (ASMERC), Tehran, Iran Associate Professor, Atmospheric Science and Metrological Research Center (ASMERC), Tehran, Iran Atmospheric Science and Metrological Research Center (ASMERC), Tehran, Iran The Great Khorasan in northeast Iran has a variety of surface structures and plains and high peaks, but due to its vicinity to the deserts of Afghanistan and Turkmenistan, it is affected by dust all the time, especially in summer. The purpose of this study was to simulate summer dust in this region by RegCM model. For this purpose, during the period 2000 to 2017, three extreme dust events were selected. The satellite image used to confirmed dust mass presence and then the synoptic structure was analyzed. Finally, the simulation results of RegCM 4.6 model were compared with the observational data including the horizontal visibility and aerosol optical depth (AOD) of Aqua satellite. The synoptic analysis showed that during the summer, low thermal pressures form in the southern Afghanistan and high pressure in the north. This structure lead to the development of north and northeast winds with speeds of 12 to 21 m / s and dust emission on the eastern border of Iran and western Afghanistan. Investigation of RegCM accuracy done by visibility, Aquas’s AOD showed that model performance in South Khorasan is better as Razavi Khorasan. The highest correlation coefficients of AOD of model and horizontal visibility were obtained at Khorasan central stations including Gonabad, Ferdows, Nahaband and Ghaen at -0.82, -0.77 and -0.44 respectively. RegCM model performed a better dust simulation in severe dust with a horizontal visibility down to less than 1000 m, high continuity and horizontal extension. Overall, the RegCM model underestimates the AOD value for the Aqua satellite algorithm.http://jgs.khu.ac.ir/article-1-3627-en.pdfgreat khorsandustregcm modelaerosol optical deep (aod) |
| spellingShingle | Elham Mobarak Hassan Ebrahim Fatahi Abass Ranjbar Saadat Abadi Nasim Hossein Hamzeh Investigating the RegCM model ability in simulation of summer Khorasan dust تحقیقات کاربردی علوم جغرافیایی great khorsan dust regcm model aerosol optical deep (aod) |
| title | Investigating the RegCM model ability in simulation of summer Khorasan dust |
| title_full | Investigating the RegCM model ability in simulation of summer Khorasan dust |
| title_fullStr | Investigating the RegCM model ability in simulation of summer Khorasan dust |
| title_full_unstemmed | Investigating the RegCM model ability in simulation of summer Khorasan dust |
| title_short | Investigating the RegCM model ability in simulation of summer Khorasan dust |
| title_sort | investigating the regcm model ability in simulation of summer khorasan dust |
| topic | great khorsan dust regcm model aerosol optical deep (aod) |
| url | http://jgs.khu.ac.ir/article-1-3627-en.pdf |
| work_keys_str_mv | AT elhammobarakhassan investigatingtheregcmmodelabilityinsimulationofsummerkhorasandust AT ebrahimfatahi investigatingtheregcmmodelabilityinsimulationofsummerkhorasandust AT abassranjbarsaadatabadi investigatingtheregcmmodelabilityinsimulationofsummerkhorasandust AT nasimhosseinhamzeh investigatingtheregcmmodelabilityinsimulationofsummerkhorasandust |