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Column-integrated aerosol optical properties of coarse- and fine-mode particles over the Pearl River Delta region in China

机译：中国珠三角地区粗模式和细模式颗粒的柱积分气溶胶光学性质

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摘要

The sun-photometer data from 2011 to 2013 at Panyu site (Panyu) and from 2007 to 2013 at Dongguan site (Dg) in the Pearl River Delta region, were used for the retrieving of the aerosol optical depth (AOD), single scattering albedo (SSA), Ångström exponent (AE) and volume size distribution of coarse- and fine-mode particles. The coarse-mode particles presented low AOD (ranging from 0.05±0.03 to 0.08±0.05) but a strong absorption property (SSA ranged from 0.70±0.03 to 0.90±0.02) for the wavelengths between 440 and 1020nm. However, these coarse particles accounted for <10% of the total particles. The AOD of fine particles (AODf) was over 3 times as large as that of coarse particles (AODc). The fine particles SSA (SSAf) generally decreased as a function of wavelength, and the relatively lower SSAf value in summer was likely to be due to the stronger solar radiation and higher temperature. More than 70% of the aerosols at Panyu site were dominated by fine-mode absorbing particles, whereas about 70% of the particles at Dg site were attributed to fine-mode scattering particles. The differences of the aerosol optical properties between the two sites are likely associated with local emissions of the light-absorbing carbonaceous aerosols and the scattering aerosols (e.g., sulfate and nitrate particles) caused by the gas-phase oxidation of gaseous precursors (e.g., SO2and NO2). The size distribution exhibited bimodal structures in which the accumulation mode was predominant. The fine-mode volume showed positive dependence on AOD (500nm), and the growth of peak value of the fine-mode volume was higher than that of the coarse volume. Both the AOD and SSA increased with increasing relative humidity (RH), while the AE decreased with increasing RH. These correlations imply that the aerosol properties are greatly modified by condensation growth.
机译：珠江三角洲番Pan地区2011年至2013年以及东莞地区Dg地区2007年至2013年的太阳光度计数据用于反演气溶胶光学深度（AOD），单散射反照率。 （SSA），Ångström指数（AE）以及粗模式和细模式粒子的体积大小分布。对于440至1020nm之间的波长，粗模式粒子表现出较低的AOD（从0.05±0.03到0.08±0.05），但是具有很强的吸收特性（SSA从0.70±0.03到0.90±0.02）。然而，这些粗颗粒占总颗粒的＜10％。细颗粒（AODf）的AOD是粗颗粒（AODc）的3倍以上。细颗粒SSA（SSAf）通常随波长而降低，夏季相对较低的SSAf值可能是由于较强的太阳辐射和较高的温度所致。番yu站点超过70％的气溶胶以精细模式吸收颗粒为主，而Dg站点上约70％的颗粒归因于精细模式散射颗粒。两个位置之间气溶胶光学特性的差异可能与吸光性碳质气溶胶的局部排放以及气态前体（例如SO2和SO2的气相氧化）引起的散射气溶胶（例如硫酸盐和硝酸盐颗粒）有关。 NO2）。尺寸分布表现出以累积模式为主的双峰结构。精细模式体积显示出对AOD（500nm）的正依赖性，并且精细模式体积的峰值增长高于粗体积。 AOD和SSA都随相对湿度（RH）的增加而增加，而AE随着RH的增加而降低。这些相关性暗示，气溶胶的性质会因凝结增长而大大改变。

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  • 来源
    《The Science of the Total Environment》 |2018年第may1期|481-492|共12页
  • 作者

    B. Mai; X. Deng; X. Xia; H. Che; J. Guo; X. Liu; J. Zhu; C. Ling;

  • 作者单位

    Institute of Tropical and Marine Meteorology/Guangdong Provincial Key Laboratory of Regional Numerical Weather Prediction, China Meteorological Administration;

    Institute of Tropical and Marine Meteorology/Guangdong Provincial Key Laboratory of Regional Numerical Weather Prediction, China Meteorological Administration;

    Laboratory for Middle Atmosphere and Global Environment Observation (LAGEO), Institute of Atmospheric Physics, CAS/School of Earth Sciences, University of Chinese Academy of Sciences;

    Chinese Academy of Meteorological Sciences;

    Chinese Academy of Meteorological Sciences;

    Guangzhou Meteorological Observatory;

    School of Atmospheric Physics, Nanjing University of Information Science and Technology;

    Donguan Meteorological Bureau;

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  • 正文语种 eng
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  • 关键词

    Fine- and coarse-mode particles; Aerosol optical properties; Size distribution; Pearl River Delta region;

    机译：细模式和粗模式粒子;气溶胶光学特性;尺寸分布;珠江三角洲地区;

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