...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Geophysical Research Letters >Size distribution and estimated optical properties of carbonate, water soluble organic carbon, and sulfate in aerosols at a remote high altitude site in western China
【24h】

Size distribution and estimated optical properties of carbonate, water soluble organic carbon, and sulfate in aerosols at a remote high altitude site in western China

机译：中国西部偏远高原地区气溶胶中碳酸盐，水溶性有机碳和硫酸盐的粒径分布和估计的光学性质

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Measurements at the GAW station in western China reveal the levels and size distributions of chemical components in aerosols. The results indicate similarly high levels of three components, water-soluble organic carbon (WSOC), Ca2++CO3= and NH4++SO4=. Both WSOC and SO4= show a dominant accumulation mode, with a geometric mean mode diameter D-g of 0.41 and 0.34 mu m and geometric standard deviation sigma(sg) of 0.31 and 0.33, respectively. This mode makes up >70% of the total mass of both species. In comparison, Ca2+ and CO3= show a prominent coarse mode with D-g of 2.98 and 1.76 mu m and sigma(sg) of 0.29 and 0.22, respectively, that accounts for >60% of the mass. Based on these characteristics, estimates of the volume scatter coefficient beta, direct back scatter coefficient beta(pi) and mass scattering efficiency phi for each component were made, assuming external mixing and optical and growth characteristics of corresponding pure chemical compounds. The results show that NH4++SO4= has the largest beta, beta(pi) and phi (median 1760x10(-8) m(-1), 79x10(-8) m(-1) sr(-1), and 6.9 m(2) g(-1), respectively). It is followed by WSOC with 1470x10(-8) m(-1), 30x10(-8) m(-1) sr(-1), and 5.3 m(2) g(-1) for beta, beta(pi), and phi, respectively. Ca2++CO3= has only about 10% of the beta and phi values but 20% of the beta(pi) of NH4++SO4= respectively. For both NH4++SO4= and WSOC, the mass scattering efficiency phi is inversely related to their D-g between the size range of 0.2-0.45 mu m. [References: 18]
机译：在中国西部的GAW站进行的测量揭示了气溶胶中化学成分的水平和大小分布。结果表明，水溶性有机碳（WSOC），Ca2 ++ CO3 =和NH4 ++ SO4 =三种成分的含量相似。 WSOC和SO4 =都显示出主要的累积模式，其几何平均模式直径D-g为0.41和0.34μm，几何标准偏差sigma（sg）分别为0.31和0.33。该模式占两个物种总质量的70％以上。相比之下，Ca2 +和CO3 =表现出明显的粗模式，D-g为2.98和1.76μm，σ（sg）分别为0.29和0.22，占质量的60％以上。基于这些特性，假定相应的纯化合物的外部混合以及光学和生长特性，对每种组分的体积散射系数β，直接向后散射系数β（pi）和质量散射效率phi进行估算。结果表明NH4 ++ SO4 =具有最大的beta，beta（pi）和phi（中位数1760x10（-8）m（-1），79x10（-8）m（-1）sr（-1）和分别为6.9 m（2）g（-1））。其次是WSOC，其beta，beta（pi）分别为1470x10（-8）m（-1），30x10（-8）m（-1）sr（-1）和5.3 m（2）g（-1） ）和phi。 Ca2 ++ CO3 =仅具有大约10％的beta和phi值，但分别具有NH4 ++ SO4 =的beta（pi）的20％。对于NH4 ++ SO4 =和WSOC，质量散射效率phi与它们的D-g在0.2-0.45μm的尺寸范围内成反比。 [参考：18]

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号