نتایج جستجو برای: dust and sand storms
تعداد نتایج: 16843625 فیلتر نتایج به سال:
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...
Dust is one of the common processes of arid and semiarid regions that its occurrence frequencies has increased in recent years in Iran. The proper identification of sand and dust storms (SDS) is particular importance due to its impact on the environment and human health. So far, several methods for identifying these sources have been proposed such as methods based on field studies and geomorpho...
1. introduction dust storm is an important atmospheric phenomenon. it has important environment, health, economic and social activities due to penetration of suspended particles of dust to the atmosphere. measurements resulting from earth and satellite stations show the fact that particles of dust in storms, remain in the nature for a long time. they can get far away by wind, hundreds of kilome...
Background and Objective: Considering the fact that Iran is located in semi-arid climate and the harmful effects of dust storms on different ecosystems, this study aimed to identify and locate dust storms using fungal bio-aerosols (spores) and HYSPLIT model in southwestern region of Iran. Materials and Methods: MODIS satellite images and HYSPLIT model were used to investigate the temporal chan...
Aerosol observational data spanning three years (2005–2007) from the Chinese Sun Hazemeter Network (CSHN) were analyzed to characterize the optical properties of spring aerosol particles in dust and non-dust weather conditions. The measurements were segregated and the dates of dust period were chosen by ground-based observations and the National Sand-dust Weather Almanac. Observational data obt...
Incidences of sand storms have increased in recent years and there is evidence that these dusts can move across long distances. Sand dusts have different adverse effects on health, but one of the most important of them is pulmonary disease. After inhalation of dust, many dust particles are moved to the airways. Dust particles can be sensed by airways epithelial cells, activate macrophages, dend...
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 ...
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