نتایج جستجو برای: dust storms

تعداد نتایج: 49333  

2014
P. Rivas-Perea J. G. Rosiles J. C. Tilton

Dust storms are of interest to study since they are correlated to an increase in mortality rates due to respiratory illness especially in the south-western U.S. With the aim of providing better tools to the understanding of dust storms, we present models for detection of dust storms from MODIS Terra Level 1B radiances, which can be applied in near real time with 1km resolution, in contrast to t...

2014
Abdulwaheed Musa Saad O. Bashir Aisha H. Abdalla

Electromagnetic wave propagation in arid and semi-arid regions is influenced by sand and dust storms. Meagre information has hitherto been reported as to the effect of storms on telecommunication systems operating in such regions. This paper presents a survey of current understanding of the wave propagation during storms. In this first part of the review—Part I, detailed parametric assessment o...

جنیدی جعفری, احمد, عمارلوئی, علی, مظلومی, سجاد, پاکزاد, ایرج,

Background and purpose: Dust storms can transfer particulate pollutants to long distances, and in some cases, to thousands of kilometers from their source. These dust storms can carry very large volumes of bioaerosols such as fungal species which are the causes of respiratory infections and allergies. The aim of this study was to determine the impact of dust storms on transmission of fungal ...

2007
Huiqun Wang

Data from the third Mars Global Surveyor (MGS) mapping year (MY 26, 2003–2005) are used to investigate dust storms originating in the northern hemisphere. Flushing dust storms, which originate as frontal dust storms at the northern polar vortex edge and propagate southward through topographic channels, are observed immediately before and after a quiescent period that occurs around the northern ...

Journal: Desert 2012
H. Ahmadi M. Yadegari M.A. Saremi Naeini

In order to recognize the wind erosion situation of a region, the survey of its windiness is not sufficient and the physical characteristics of earth are of importance too. In fact, the outbreak of dust storms in a region is due to the sensitivity of earth and domination of wind in that region. In this investigation we have tried to find a way for determining the regions in which a dust storm i...

Journal: :پژوهش های جغرافیای طبیعی 0
سمیه ناصرپور کارشناس ارشد اقلیم شناسی دانشگاه خوارزمی تهران بهلول علیجانی استاد دانشکدۀ علوم جغرافیایی دانشگاه خوارزمی تهران و مدیر قطب علمی تحلیل فضایی مخاطرات محیطی پرویز ضیائیان دانشیار دانشکدۀ علوم جغرافیایی دانشگاه خوارزمی تهران

introduction the dust storms are one of the climatic hazards in the dry climates of the world. they cause many damages to the environment and humans. one of the aspects of a study to understand the origin of this phenomenon is the formation of foci in the recent years in the areas of research. it has been done in the central regions. the dust storms have gained global scale. this has demonstrat...

Journal: :ecopersia 0
deeman ghaffari former master student of watershed management, department of rangeland and watershed management, malayer university, malayer, iran hamid nouri assistant professor of climatology, department of rangeland and watershed management malayer university, malayer, iran

the moisture flux convergence (mfc) and relative humidity in dusty days at different times and levels over the alvand mountain was investigated. the required basic data for the years 2009-2012, including relative humidity, visibility and synoptic codes, were gathered from hamadan synoptic station, while sea level pressure, uwind, vwind and specific humidity data were gathered from ncer/ncar sit...

Journal: :journal of rangeland science 2015
davoud akhzari behnoush farokhzadeh iman saeedi mohsen goodarzi

dust storms are known as hazardous problems in western part of iran. iraq is one of the main sources for dust storm arriving to the western part of iran. the radial basis function network model (rbfn) has been used to assess wind erosion hazards in the source area of dust storms over several western iranian cities. normalized difference salinity index (ndsi) was used to determine the changes in...

Journal: :desert 2013
h. ahmadi m.a. saremi naeini m. yadegari

in order to recognize the wind erosion situation of a region, the survey of its windiness is not sufficient and the physical characteristics of earth are of importance too. in fact, the outbreak of dust storms in a region is due to the sensitivity of earth and domination of wind in that region. in this investigation we have tried to find a way for determining the regions in which a dust storm i...

Journal: :Environmental research 2004
Yong-Shing Chen Pai-Ching Sheen Eng-Rin Chen Yi-Kuen Liu Trong-Neng Wu Chun-Yuh Yang

In spring, windblown dust storms originating in the deserts of Mongolia and China make their way to Taipei City. These occurrences are known as Asian dust storm events. The objective of this study was to assess the possible effects of Asian dust storms on the mortality of residents in Taipei, Taiwan, during the period from 1995 to 2000. We identified 39 dust storm episodes, which were classifie...

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