中国东海近海气溶胶的陆源特征

被引:3
作者
吴天
魏星
郑志坚
陈莹
机构
[1] 复旦大学环境科学与工程系
关键词
中国东海; 气溶胶; 陆源特征; 来源;
D O I
10.15943/j.cnki.fdxb-jns.2010.05.012
中图分类号
X513 [粒状污染物];
学科分类号
0706 ; 070602 ;
摘要
源于中国西北部的亚洲沙尘暴频繁发生于春季,经长途传输到中国近海,对大气环境和海洋初级生产力可能产生显著影响.选取中国东海的小洋山岛于2008年春季采集研究了PM2.5和TSP共78个样品.结果表明,TSP和PM2.5的日平均质量浓度分别为133.6μg/m3和53.2μg/m3.陆源特征明显,观测到的海盐气溶胶和矿物气溶胶约占总质量浓度的6%和23%左右,陆地上人为活动排放的污染物对小洋山岛气溶胶的贡献率在70%以上,且在偏西风主导风向下,气溶胶质量和主要离子元素的平均浓度最高,这在一定程度上说明了陆源输送是春季东海近海大气气溶胶的主要来源.陆源气溶胶和海盐粒子发生混合作用使得SO42-,NO3-和NH4+等二次气溶胶离子主要分布在粗颗粒物中.氯亏损率和元素富集系数(EF)也表明陆地上大量的酸污染和Cr,Cu,Pb,Cd,As,Zn等污染元素进入到了东海上空,可能对近海生态系统发生重要影响.
引用
收藏
页码:626 / 633+641 +641
页数:9
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