Humidity dependence of aerosol optical properties of light absorbing aerosols

了解大气气溶胶光学特性对相对湿度的依赖关系，对于估算气溶胶对地球大气辐射平衡的影响至关重要。在这项工作中，我们已经开发了一个腔衰荡光谱仪测量相对湿度依赖的气溶胶消光系数。通过将该仪器应用于观测和实验室研究，发现气溶胶的折射率、化学成分和混合状态对确定消光系数的RH依赖性起着重要作用。

Understanding of relative humidity(RH) dependence of optical properties of atmospheric aerosols is essential to estimate their effects on radiation balance in the Earth's atmosphere. In this work, we have developed a cavity ring-down spectrometer to measure RH dependence of aerosol extinction coefficients. By applying the instrument to observational and laboratory studies, it is found that the refractive index, chemical compositions, and mixing states of aerosols play important roles to determine the RH dependence of extinction coefficients.