The Long-range Transport of Dust from Mongolia Gobi to the Yangtze River Basin and its Mixing with Pollutant Aerosols
The Long-range Transport of Dust from Mongolia Gobi to the Yangtze River Basin and its Mixing with Pollutant Aerosols
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发表时间：
2009
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通讯作者：
Z. Hao
中科院分区：
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作者：
Z. Hao
通过对2007年春季亚洲沙尘暴及其在中国的远距离输送过程的监测，结合前向/后向气团轨迹分析，得到了中国北方/蒙古国低钙沙尘的主要来源，以及北方/东北部低钙沙尘源区向长江下游上海的输送路径，用Ca/Al元素示踪分析法对沙尘输送的化学特征进行了研究，分析了不同地点沙尘的质量浓度、元素/离子组成的变化，结合元素富集因子分析表明，由于原始尘源附近的人为来源较少，沙尘颗粒与污染物的混合并不明显，而随着沙尘向华东地区的输送和污染气溶胶的累积，颗粒物化学特征比值（SO2-4/3）/S和∑+/∑-分别由0.65和3.21增大到1.00和减小到0.47，表明粉尘在输送过程中的非均相反应和矿物与污染组分的混合作用增强，颗粒物酸化加剧，在中国东部的许多城市，由于沙尘的远距离输送，空气质量严重下降，这应该引起人们的紧急关注。
A spring sampling campaign was carried out to monitor the Asian dust storm and its long-range transport across China in 2007.Combined with the backward/forward air mass trajectories analysis,the main low-Ca dust source from the northern China/Mongolia and the transport pathway from the Northern/Northeastern low Ca dust source regions to Shanghai,a downstream site in the Yangtze River Basin,were identified with the Ca/Al elemental tracer analysis.The chemical characterization of dust transport was conducted with examining the variations of mass concentrations,elemental/ionic compositions of dust from site to site,The result from the above analysis,in combination with elemental enrichment factor analysis indicated the mixing of dust particles with pollution was not so evident due to less anthropogenic sources from the near site of original source dust,in contrast to the downstream sites.While with the transport of dust to East China and accumulation of pollution aerosols,the chemical characteristic ratio value of particle,(SO2-4/3)/S and ∑+/∑-,increased and decreased,from 0.65 to 1.00 and from 3.21 to 0.47,respectively,indicating the heterogeneous reaction on dust and mixing of mineral with pollution components during the dust transport were enhanced,and the acidification of particles was aggravated.Furthermore,in many cities of Eastern China severe degradation of air quality due to long-range transport of dust should be urgently concerned.