نتایج جستجو برای: we can mention dust storms

تعداد نتایج: 5775652  

Journal: :Remote Sensing 2012
Zhaohui Lin Jason K. Levy Hang Lei Michelle L. Bell

Dust storms in North China result in high concentrations of airborne dust particles, which cause detrimental effects on human health as well as social and economic losses and environmental degradation. To investigate the impact of land surface processes on dust storms, we simulate two dust storm events in North China during spring 2002 using two versions of a dust storm prediction system develo...

2010
Pablo Rivas-Perea José-Gerardo Rosiles Mario Ignacio Chacon Murguia James Tilton

This paper address the detection of dust storms based on a probabilistic analysis of multispectral images. We develop a feature set based on the analysis of spectral bands reported in the literature. These studies have focused on the visual identification of the image channels that reflect the presence of dust storms through correlation with meteorological reports. Using this feature set we dev...

2016
Xuelei Zhang Lijing Zhao Daniel Q. Tong Guangjian Wu Bo Teng

Dust storms and sandy dust events originating in arid and semi-arid areas can transport particulate material, pollutants, and potential transport long distances from their sources. Exposure to desert dust particles is generally acknowledged to endanger human health. However, most studies have examined anthropogenic particulate sources, with few studies considering contributions from natural des...

2016
Bing Pu Paul Ginoux

The increasing trend of aerosol optical depth in the Middle East and a recent severe dust storm in Syria have raised questions as to whether dust storms will increase and promoted investigations on the dust activities driven by the natural climate variability underlying the ongoing human perturbations such as the Syrian civil war. This study examined the influences of the Pacific Decadal Oscill...

Journal: :محیط شناسی 0
ام السلمه بابایی فینی استادیار اقلیم شناسی، گروه جغرافیا، دانشگاه پیام نور طاهر صفرراد دانشجوی دکتری اقلیم شناسی، دانشکدۀ جغرافیا، دانشگاه تهران مصطفی کریمی استادیار اقلیم شناسی، دانشکدۀ جغرافیا، دانشگاه تهران

introduction earth has ever been exposed to environmental hazards. the hazards are continually occurring in the world in the recent years. among them, atmospheric elements have created many human and financial losses in different regions. one of the hazards is dust events and in its severe case is dust storm. it happens more frequently in arid and semiarid regions in deserts and their surroundi...

2003
Junjun Liu Mark I. Richardson R. J. Wilson

[1] Intercomparison of thermal infrared data collected by Mariner 9, Viking, and Mars Global Surveyor (MGS) is presented with a specific focus on air temperatures, dust opacities, and water ice opacities. Emphasis is placed on creating a uniform data set to most effectively reduce interinstrument biases and offsets. The annual cycle consistently shows a strong asymmetry about the equinoxes, wit...

ژورنال: علوم آب و خاک 2015
جعفری, رضا, سلطانی, سعید, مهرابی, شهباز,

Since climate has a major impact on dust generation, it is essential to identify the climatic parameters affecting this phenomenon. In this study, climatic parameters including temperature, relative humidity, rainfall, maximum wind speed and direction were selected and their relationship with visibility data and also dust storm days (recorded at meteorological stations) was analyzed on monthly ...

2016
Manzhu Yu Chaowei Yang

Dust storms are devastating natural disasters that cost billions of dollars and many human lives every year. Using the Non-Hydrostatic Mesoscale Dust Model (NMM-dust), this research studies how different spatiotemporal resolutions of two input parameters (soil moisture and greenness vegetation fraction) impact the sensitivity and accuracy of a dust model. Experiments are conducted by simulating...

2015
Hanne Krage Carlsen Thorarinn Gislason Bertil Forsberg Kadri Meister Throstur Thorsteinsson Thorsteinn Jóhannsson Ragnhildur Finnbjornsdottir Anna Oudin

Volcanic ash contributed significantly to particulate matter (PM) in Iceland following the eruptions in Eyjafjallajökull 2010 and Grímsvötn 2011. This study aimed to investigate the association between different PM sources and emergency hospital visits for cardiorespiratory causes from 2007 to 2012. Indicators of PM10 sources; "volcanic ash", "dust storms", or "other sources" (traffic, firework...

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