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An Observational and Numerical Study on the Topographic Influence on dust transport in East Asia

Acta meteorologica Sinica 2009年第5期23卷 629-641页

作者：姜学恭陈受钧 Inner Mongolia Autonomous Region Meteorological Observatory Department of Atmospheric Sciences School of PhysicsPeking University

Based on observations and numerical simulations, the topographic impacts on dust transport in East Asia were studied. Two regions frequently attacked by dust storms have been confirmed： one is the western part of Inner Mongolia and the southern Mongolia （namely the Mongolia Plateau）, and the other is the Tarim Basin. The most frequent dust storm occurrence area within the first region appears in its hinterland while that of the second one lies in its southern boundary. Moreover, the region from the northeastern edge of the Tibetan Plateau （TP） to the Loess Plateau is attacked by dust storms second frequently. The dust storms frequently occurring over the Mongolia Plateau axe related not only to the abundant sand and dust sources, but also to the special topographic conditions of East Asia. The most significant factor that influences the dust storms forming in the hinterland of the Mongolia Plateau is the canyon low level jet （CLLJ）, which dominates around the southern areas of the Altay-Sayan Mountains with an east-west direction in the beginning of its formation, and is accompanied by significantly enhanced surface wind afterwards. Due to the obstructive effects of the CLLJ, a lot of dust particles carried by the southward down-slope cold air mass would pile up over the southern slope of the Sayan Mountains. Meanwhile, uneven surface conditions are favorable for the dust particles to go up into the upper atmosphere. With the dust particles piling up continuously, a dust layer is formed in the troposphere and can be recognized as a ＇!dust accumulating container＂, which provides abundant dust particles to be transported later to the downstream areas. Additionally, the topographic features of East Asia also exert a great influence on dust transport. Generally, the easterly CLLJ enhances the easterly dust transport. The down-slope air current over the southern Sayan Mountains and the air flow surrounding the TP near its northeastern edge enhance the southward dust tran

关键词： dust transport topographic influence observations and numerical simulations

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The Northern Path of Asian dust transport from the Gobi Desert to North America

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Atmospheric and Oceanic Science Letters 2010年第3期3卷 155-159页

作者： Chen Ke-Yi The Department of Atmospheric Sciences Chengdu University of Information & Technology Chengdu 610225 China

The aerosol index (AI) of the Total Ozone Mapping Spectrometer (TOMS) satellite data (1979 2001) was analyzed to reveal the climatological long-distance path of dust transport from Asia to North America. The AI in the west coast of the United States is highly correlated with that in the Gobi desert. Additionally, from the TOMS satellite images, it can be seen that very strong plumes advect from Asia to the west coast of North America in typical dust storm cases. When applying the sourcereceptor relationship to detect the northern dust transport path between the Gobi source region and the west coast of the United States receptor region, it is evident that the dust plume can be transported northward beyond 60°N from its source region and that it takes 5 to 6 days to reach the west coast of the United States. The cross correlation technique shown in this work is a useful tool that can be applied in other regions to give useful insights into relationships between major dust sources and downwind receptor locations by using remotely sensed dust observations.

关键词： dust transport the Total Ozone Mapping Spectrometer satellite data

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The Cross-Correlation Function as a Tool for Detecting Source-Receptor Relationships:Application to Asian dust transport to North America

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Atmospheric and Oceanic Science Letters 2012年第2期5卷 119-122页

作者： Chen Ke-Yi Liu Xue-Chang The Department of Atmospheric Sciences Chengdu University of Information and Technology Chengdu 610225 China

The cross-correlation function was used in conjunction with the daily values of the aerosol index (AI) from the Total Ozone Mapping Spectrometer (TOMS) to establish and qualify a source-receptor relationship between dust over the Gobi desert and the West Coast of the United *** objective method that can be used to determine the trajectory of dust transport and the transportation time at different locations along the trajectory across the Pacific are presented in this *** spring season was analyzed (March to May),and the results showed that dust reaches the western United States in approximately five to six *** dust transport from the Gobi desert was demonstrated in the present study,the proposed cross-correlation technique can be applied to other regions and can be used to obtain useful insights on relationships between major dust sources and downwind receptor locations utilizing remotely sensed dust estimates.

关键词： dust transport Gobi desert TOMS satellitedata

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Monitoring Mongolia Gobi dust transport using OMI data

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Research in Cold and Arid Regions 2012年第5期4卷 446-451页

作者： KeYi Chen ZhiQiang Peng College of Atmospheric Sciences Chengdu University of Information & Technology/Plateau Atmospheric and Environment Key Laboratory of Sichuan Province Chengdu Sichuan 610225 China PLA 93285 Troops Gongzhuling Jilol 136100 China

The characteristics of long-distance dust transport from Asia to the United States over the Pacific Ocean are statistically analyzed using OMI AI （Ozone Monitoring Instrument Aerosol Index） data during 2005-007. The results show that there is a high correla- tion of At （the correlation coefficients are as high as 0.83 in March, 0.62 in April and 054 in May） between the Mongolia Gobi Desert and the west coast region of the United States （40°-50°N, 120°- 130°W）, indicating a strong source-receptor area relationship. Through calculating the lag correlation coefficient of the dust propagation time, we determined that the dust propagation lime fi＇om the Mongolia Gobi Desert to the west coast of the United States is about 6-7 days at the 99% confidence level.

关键词： dust transport Total Ozone Mapping Spectrometer (TOMS) OMI data

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Comparison of dust emissions, transport, and deposition between the Taklimakan Desert and Gobi Desert from 2007 to 2011

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Science China Earth Sciences 2017年第7期60卷 1338-1355页

作者： CHEN SiYu HUANG JianPing LI JingXin JIA Rui JIANG NanXuan KANG LiTai MA XiaoJun XIE TingTing Lanzhou University College of Atmospheric Sciences Chinese Academy of Meteorological Sciences Institute of Climate System (Polar Meteorology) State Key Laboratory of Severe Weather

The Taklimakan Desert(TD) and Gobi Desert(GD) are two of the most important dust sources in East Asia, and have important impact on energy budgets, ecosystems and water cycles at regional and even global scales. To investigate the contribution of the TD and the GD to dust concentrations in East Asia as a whole, dust emissions, transport, and deposition over the TD and the GD in different seasons from 2007 to 2011 were systematically compared, based on the Weather Research and Forecasting model coupled with Chemistry(WRF-Chem). dust emissions, uplift, and long-range transport related to these two dust source regions were markedly different due to differences in topography, elevation, thermal conditions, and atmospheric circulation. Specifically,the topography of the GD is relatively flat, and at a high elevation, and the area is under the influence of two jet streams at high altitudes, resulting in high wind speeds in the upper atmosphere. Deep convective mixing enables the descending branch of jet streams to continuously transport momentum downward to the mid-troposphere, leading to enhanced wind speeds in the lower troposphere over the GD which favors the vertical uplift of the GD dust particles. Therefore, the GD dust was very likely to be transported under the effect of strong westerly jets, and thus played the most important role in contributing to dust concentrations in East Asia. Approximately 35% and 31% of dust emitted from the GD transported to remote areas in East Asia in spring and summer, respectively. The TD has the highest dust emission capabilities in East Asia, with emissions of about 70.54 Tg yr.1 in spring, accounting for 42% of the total dust emissions in East Asia. However, the TD is located in the Tarim Basin and surrounded by mountains on three sides. Furthermore, the dominant surface wind direction is eastward and the average wind speed at high altitudes is relatively small over the TD. As a result, the TD dust particles are not easily transpo

关键词： East Asian dust WRF-Chem model Taklimakan Desert dust Gobi Desert dust dust emissions dust transport dust deposition

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Regional transport of anthropogenic pollution and dust aerosols in spring to Tianjin——A coastal megacity in China

Regional transport of anthropogenic pollution and dust aeros...

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第十五届海峡两岸气胶技术研讨会

作者： Xiaoli SU Junji CAO Zhengqiang LI Key Lab of Aerosol Chemistry & Physics Institute of Earth EnvironmentChinese Academy of Sciences State Environmental Protection Key Laboratory of Satellite Remote Sensing Institute of Remote Sensing and Digital EarthChinese Academy of Sciences

Simultaneous measurements of columnar aerosol microphysical and optical properties,as well as PM chemical compositions,were made during two types of spring pollution episodes in Tianjin,a coastal megacity of *** events were investigated using field observations,satellite data,model simulations,and meteorological *** lower ? ngstr?m Exponent and the higher Aerosol Optical Depth on 29 March,compared with the earlier event on 26 March,implied a dominance of coarse mode particles — this was consistent with the differences in volume-size *** on the single scattering spectra,the dominant absorber(at blue wavelength) changed from black carbon during less polluted days to brown carbon on 26 March and dust on 29 *** concentrations of major PM species for these two episodes also differed,with the earlier event enriched in pollution-derived substances and the later with mineral dust *** formation mechanisms of these two pollution episodes were also *** 26 March episode was attributed to the accumulation of both local emissions and anthropogenic pollutants transported from the southwest of Tianjin under the control of high pressure *** the high aerosol loading on 29 March was caused by the mixing of transported dust from northwest source region with local urban *** mixing of transported anthropogenic pollutants and dust with local emissions demonstrated the complexity of springtime pollution in *** synergy of multi-scale observations showed excellent potential for air pollution study.

关键词： Multi-scale observations urban pollution dust transport formation mechanism

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