Scholarlink

<p>This paper reviews recent advances in understanding the submicron characteristics and direct radiative effects (DRE) of East Asian dust. An integrated framework combining a dust simulation chamber with automated computer-controlled scanning electron microscopy coupled with energy-dispersive X-ray spectroscopy (CCSEM-EDX) was developed to characterize the physicochemical properties of submicron dust, including morphology, size distribution, mineralogy, and mixing state. Freshly emitted dust particles exhibit predominantly irregular morphologies, with elongated shapes being most common and spherical particles rarely observed. The number-based particle size distribution shows a consistent peak at 0.6–0.8&#xa0;μm. Iron oxide particles are mainly submicron and typically dispersed within clay aggregates, whereas iron-bearing minerals are comparatively scarce and seldom occur as coarse particles several micrometers in diameter. By number, mineral particles are mainly distributed within the 0.5–2.0&#xa0;μm size range, while by mass they are concentrated primarily between 2.0 and 5.0&#xa0;μm. Particles larger than 5&#xa0;μm are dominated by illite, iron-bearing minerals, mica, kaolinite, and chlorite, together accounting for about 80% of the total mass. Based on these observations, a new source-dependent complex refractive index for East Asian dust was derived and found to be approximately an order of magnitude lower than commonly used OPAC values. Incorporating this observationally constrained refractive index into the CAS-FGOALS-f3 global climate model results in enhanced shortwave cooling at the top of the atmosphere. In dust source regions, the net radiative effect shifts from atmospheric heating to cooling, while reduced shortwave absorption weakens atmospheric heating and diminishes surface cooling.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

An Integrated Framework for Asian Dust Research: From Microcharacterization to Climate Simulation

  • 期刊论文

  • 发表日期：

    2026年4月10日

查看全文
  • Junji Cao,
  • Tafeng Hu,
  • Hao Wang,
  • Feng Wu,
  • Chenglai Wu,
  • Youjia Yuan,
  • Daizhou Zhang

摘要

This paper reviews recent advances in understanding the submicron characteristics and direct radiative effects (DRE) of East Asian dust. An integrated framework combining a dust simulation chamber with automated computer-controlled scanning electron microscopy coupled with energy-dispersive X-ray spectroscopy (CCSEM-EDX) was developed to characterize the physicochemical properties of submicron dust, including morphology, size distribution, mineralogy, and mixing state. Freshly emitted dust particles exhibit predominantly irregular morphologies, with elongated shapes being most common and spherical particles rarely observed. The number-based particle size distribution shows a consistent peak at 0.6–0.8 μm. Iron oxide particles are mainly submicron and typically dispersed within clay aggregates, whereas iron-bearing minerals are comparatively scarce and seldom occur as coarse particles several micrometers in diameter. By number, mineral particles are mainly distributed within the 0.5–2.0 μm size range, while by mass they are concentrated primarily between 2.0 and 5.0 μm. Particles larger than 5 μm are dominated by illite, iron-bearing minerals, mica, kaolinite, and chlorite, together accounting for about 80% of the total mass. Based on these observations, a new source-dependent complex refractive index for East Asian dust was derived and found to be approximately an order of magnitude lower than commonly used OPAC values. Incorporating this observationally constrained refractive index into the CAS-FGOALS-f3 global climate model results in enhanced shortwave cooling at the top of the atmosphere. In dust source regions, the net radiative effect shifts from atmospheric heating to cooling, while reduced shortwave absorption weakens atmospheric heating and diminishes surface cooling.