基于光声光谱研究气溶胶在近紫外、可见和红外波段的光吸收特性

Atmospheric aerosol absorption of solar radiation plays an important role on visibility, climate, environment, and cloud dynamics. Atmospheric aerosol absorption has been a most important and difficult problem in atmospheric science, it is a focus of research aerosol effect on climate. However, aerosol absorption properties are known only with large uncertainties, especially in the wavelength of near UV and IR, mainly because of the lack of appropriate instrumentation. Moreover, the concentration of strong absorption aerosol of black carbon in China is higher than others, due to high occurrences of dust storms in north China and energy consumption structure, straw burning problems in middle east China. So, it's absolutely necessary to strengthen experiment and theory studies on aerosol absorption in China, which will improve the understanding of aerosol effect on radiative forcing and regional or global climate. The proposal will carry out the measurement of aerosol absorption at near UV, visible and IR wavelength with photoacoustic spectroscopy. Analysis and comparison of aerosol absorption properties at no haze, haze and straw burning conditions will be studied. This research will improve the knowledge of aerosol absorption properties in the spectrum of solar radiation, and improve the understanding of aerosol effect on climate and environment.And also offer scientific support for making a better decision of control pollutions caused by aerosol.

由于大气气溶胶吸收对能见度、地球气候、环境和云物理特性的强烈影响，气溶胶光吸收特性研究是当前大气科学的一个国际前沿和难点问题之一，是气溶胶气候效应、雾霾等研究领域关注的重点内容之一。然而，受困于测量技术和方法，气溶胶吸收特性，尤其是近紫外和红外波段的吸收特性的科学认知水平仍然很低。更值得一提的是，我国大气中强吸收黑碳气溶胶含量偏高。因此加强气溶胶吸收特性的观测和研究,对深入认识我国气溶胶辐射强迫、气候、环境效应、雾霾天气等科学问题具有重要的科学意义。本项目拟通过基于光声光谱的方法，开展气溶胶在近紫外、可见和红外波段的吸收特性研究，并对比分析大气气溶胶在非雾霾、雾霾和秸秆燃烧情况下的吸收特性。从而理解和认识气溶胶在太阳辐射主要波段内的吸收特性，促进气溶胶对气候、环境作用的科学认知，为制定气溶胶所导致的环境、气侯问题的政策与决策提供科学支持。

气溶胶吸收对大气能见度、地球气候、环境和云物理特性有着强烈影响，气溶胶光吸收特性研究是当前大气科学的一个国际前沿和难点问题之一。然而，受困于测量技术和方法，气溶胶吸收特性，尤其是气溶胶波长依赖特性研究非常有限。因此本项目研究过程中创新性的提出了多通道光声光谱技术，解决气溶胶吸收的多波长测量难题。通过建立单波长气溶胶吸收光声光谱仪和基于多通道光声光谱新技术的多波长气溶胶吸收光声光谱仪，以及光声光谱标定系统，开展了大气气溶胶吸收的连续观测研究和香烟、秸秆等实验室燃烧生成气溶胶的多波长吸收测量研究。所提出的多通道光声光谱新技术在与法国的国际合作研究中得到了应用。项目研究已发表学术论文8篇，其中SCI 收录6篇（4篇为一区论文）。申请专利3项，其中授权2项。