نتایج جستجو برای: introduction dust storms

تعداد نتایج: 424222  

Journal: :آب و خاک 0
رضا بیت لفته احمد لندی سعید حجتی غلامعباس صیاد

introduction: recently, air pollution due to the occurrence of dust storms is one of the worst environmental problems in western and southwestern iran, especially the khuzestan province (12, 13). according to the reports of the meteorological organization of iran the average number of dusty days in the cities of ahvaz and abadan in the khuzestan province reaches 68 and 76 days each year, respec...

2008
T. Satomura

Introduction: Many local dust storms have been observed near the polar cap edges [1]. Some local dust storms near the polar cap edges grew into a global dust storm [2,3]. Using a GCM, [4] showed that dust artificially injected into the atmosphere near the southern cap edge in the southwest Hellas Basin moved to the north along the western inner rim of the basin. This movement of dust simulated ...

Journal: :محیط شناسی 0
عباسعلی ولی استادیار بیابان زدایی، گروه علوم مهندسی بیابان، دانشکدۀ منابع طبیعی و علوم زمین، دانشگاه کاشان، کاشان، ایران سجاد خاموشی کارشناسی ارشد بیابان زدایی، گروه علوم مهندسی بیابان، دانشکدۀ منابع طبیعی و علوم زمین، دانشگاه کاشان، سید حجت موسوی استادیار ژئومورفولوژی، گروه جغرافیا و اکوتوریسم، دانشکدۀ منابع طبیعی و علوم زمین، دانشگاه کاشان، کاشان، ایران فاطمه پناهی استادیار بیابان زدایی، گروه علوم مهندسی بیابان، دانشکدۀ منابع طبیعی و علوم زمین، دانشگاه کاشان، کاشان، ایران احسان تمسکی کارشناسی ارشد بیابان زدایی، دانشگاه هرمزگان، بندرعباس، ایران

introduction dust storms, one type of dust event, are in most cases the result of turbulent winds, including convective haboobs, which raise large quantities of dust from desert surfaces and reduce visibility to less than 1 km. this dust reaches concentrations in excess of 6000 mg m3 in severe events. the major dust source regions are areas of arid and hyper-arid, with mean annual rainfalls of ...

Journal: :journal of rangeland science 2016
victor r squires

the impacts of dust and sand storms (dss) on people, crops, livestock, infrastructure and health are well documented. data have accumulated on the deleterious effects of dust aerosols when they settle on plants. sand blasting of low growing plants is a common cause of failure in reforestation efforts. burial of plants by moving sands are also a cause of much damage. the physics of moving sand a...

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In this study, the changes in the Khorramabad storm in the period of 1952 to 2015 have been investigated. For this purpose, data from meteorological codes 06 and 07 were received from the Meteorological Organization of the country, and after identifying the days of winding with dust storms and calculating their monthly frequency, monthly, seasonal and annual time series were analyzed. In this s...

Journal: Desert 2012
A. Miri A. Pahlavanravi H. Ahmadi M.R. Ekhtesasi

Dust storms are catastrophic natural disasters that beside other disasters frequency occur in the arid and semiaridregions worldwide. Drought occurrence, climate aridity, dryness of the Hamoun Lake cause strong winds to below.These conditions have been prepared for dust storms in Sistan region. The damages to Sistan society have beenmeasured using different criteria. The result shows that, peak...

Journal: :desert 2012
a. pahlavanravi a. miri h. ahmadi m.r. ekhtesasi

dust storms are catastrophic natural disasters that beside other disasters frequency occur in the arid and semiaridregions worldwide. drought occurrence, climate aridity, dryness of the hamoun lake cause strong winds to below.these conditions have been prepared for dust storms in sistan region. the damages to sistan society have beenmeasured using different criteria. the result shows that, peak...

Journal: :desert 0
a. pahlavanravi faculty of natural resources, university of zabol, zabol, iran a. miri faculty of natural resources, university of zabol, zabol, iran h. ahmadi islamic azad university, science and research branch, tehran, iran m.r. ekhtesasi faculty of natural resources, university of yazd, yazd, iran

dust storms are catastrophic natural disasters that beside other disasters frequency occur in the arid and semiaridregions worldwide. drought occurrence, climate aridity, dryness of the hamoun lake cause strong winds to below.these conditions have been prepared for dust storms in sistan region. the damages to sistan society have beenmeasured using different criteria. the result shows that, peak...

Introduction: The occurrence of dust storms in deserts or arid regions increases the suspended dust particles to more than the allowed threshold, and this has negative effects on atmospheric conditions, human health and agricultural production. Positioning of Iran in the world arid and semi-arid belt is exposed to various types of dust storm systems. Occurrence of severe dust storms in most par...

Journal: :فیزیک زمین و فضا 0
فرحناز تقوی استادیار، گروه فیزیک فضا، موسسه ژئوفیزیک دانشگاه تهران، ایران الهه اولاد دانشجوی کارشناسی ارشد هواشناسی، گروه فیزیک فضا، موسسه ژئوفیزیک دانشگاه تهران، ایران طاهر صفرراد دانشجوی دکتری اقلیم شناسی، دانشکده جغرافیا دانشگاه تهران، ایران پرویز ایران نژاد دانشیار، گروه فیزیک فضا، موسسه ژئوفیزیک دانشگاه تهران، ایران

mineral dust can directly affect the solar and terrestrial radiation in both visible and infrared (ir) spectral regions through scattering and absorption processes. due to specific optical properties of dust particles, satellite observed radiances carry the spectral signatures of dust particles that are different from molecular, cloud, and underlying surface. based on these differences, various...

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