تحقیقات کاربردی علوم جغرافیایی

تحقیقات کاربردی علوم جغرافیایی

بررسی توانایی مدل ‌RegCM‌ در شبیه‌سازی گردوخاک تابستانی خراسان ‌بزرگ

نویسندگان
الهام مبارک حسن 1
ابراهیم فتاحی 2
عباس رنجبر سعادت آبادی 2
نسیم حسین حمزه 3
1 استادیار دانشگاه آزاد اسلامی واحد اهواز
2 دانشیار پژوهشگاه هواشناسی و علوم جوی، تهران، ایران
3 پژوهشگاه هواشناسی و علوم جوی، تهران، ایران
10.61186/jgs.23.71.39
چکیده
استان خراسان بزرگ واقع در شمال شرق ایران ساختار سطحی متنوعی با دشت‌ها و قله‌های متعدد دارد اما به دلیل مجاورت با بیابان‌های افغانستان و ترکمنستان در همه اوقات سال به‌ویژه تابستان تحت تأثیر گردوخاک قرار می‌گیرد. هدف از این مطالعه، شبیه‌سازی گردوخاک‌های تابستانی توسط مدل RegCM است. به این منظور در طی دوره 2000 تا 2017 سه رویداد گردوخاک شدید و فراگیر انتخاب شدند. وجود گردوخاک با تصویر ماهواره تائید و سپس ساختار همدیدی تحلیل شد. در انتها نیز نتیجه شبیه‌سازی مدل RegCM4.6 با داده‌های مشاهداتی دید افقی و عمق نوری اپتیکی هواویز AOD ماهواره آکوا مقایسه شد. نتیجه بررسی همدیدی نشان می‌دهد که در فصل تابستان کم‌فشار حرارتی در جنوب و پرفشار در شمال افغانستان شکل می‌گیرد که منجر به توسعه بادهای شمال و شمال شرقی با سرعت 12 تا 21 متربر ثانیه در مرز شرقی ایران و غرب افغانستان شده و گردوخاک در این مناطق انتشار می‌یابد. بررسی برون داد مدل RegCM بادید افقی و AOD حاصل از ماهواره آکوا نشان می‌دهد که عمل کرد مدل در خراسان جنوبی بهتر از خراسان رضوی است. بیشترین ضریب همبستگیAOD مدل و دید افقی در ایستگاه‌های مرکزی خراسان شامل گناباد، فردوس، نهبندان و قائن به ترتیب با 82/0-، 77/0- و 44/0- در 1 جولای 2014 به دست آمد. مدل RegCM در گردوخاک‌های شدید با کاهش دید افقی به کمتر از 1000 متر، تداوم و گسترش افقی زیاد نتیجه بهتری از شبیه‌سازی گردوخاک به دست می‌دهد. به‌طورکلی مدل RegCM ازنظر مقدار AOD را کمتر از الگوریتم ماهواره آکوا برآورد می‌نماید.
کلیدواژه‌ها
خراسان بزرگ
گردوخاک
مدل ‌RegCM‌
عمق نوری هواویزAOD

عنوان مقاله English

Investigating the RegCM model ability in simulation ‎of summer Khorasan dust ‎

نویسندگان English

Elham Mobarak Hassan 1
Ebrahim Fatahi 2
Abass Ranjbar Saadat Abadi 2
Nasim Hossein Hamzeh‎ 3
1 Assistant Professor, Department of Environment, Ahvaz Branch, Islamic Azad University, Ahvaz, Iran
2 Associate Professor, Atmospheric Science and Metrological Research Center (ASMERC), Tehran, Iran
3 Atmospheric Science and Metrological Research Center (ASMERC), Tehran, Iran
چکیده English

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.

کلیدواژه‌ها English

Great Khorsan
Dust
RegCM Model
Aerosol optical Deep (AOD)‎
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