Assessments of the Impact of Tropospheric Aerosols on Actinic Fluxes, Photosynthetically Available Radiation (PAR), and Radiative Forcing

当太阳辐射穿过大气层时，它会与被称为气溶胶的小颗粒相互作用。这些粒子可以散射和吸收太阳辐射，这会影响到达地球表面的辐射量。太阳辐射与气溶胶的相互作用也会影响大气的化学成分，例如通过臭氧的产生和破坏。为了更好地理解和模拟这些相互作用，研究小组将使用研究飞机在过去20年中收集的数据以及数值模拟来回答有关气溶胶如何与一定高度、太阳角度和地理环境中的太阳辐射相互作用的问题。该项目的成果将有助于改进气候模型。其他好处将是对研究生的教育和培训，以及开发一个可供其他研究人员使用的数据库。研究小组将通过综合和分析观测到的光谱光化通量，提高对对流层气溶胶对光化通量和大气组成的影响的理解。NCAR带电耦合器件光化通量光谱仪(CAFS)在过去二十年中进行了多次野外飞行，CAFS的测量加上气溶胶特性测量为研究气溶胶对光化学的影响提供了一个独特的机会。CAFS数据以及同步的亚轨道和卫星数据和模拟将用于解决四个主要目标：1)开发新的气溶胶衰减光化通量数据库，2)深入分析不同气溶胶条件下的光化通量，3)分析烟雾气溶胶对光合作用可用辐射(PAR)和紫外线直接辐射强迫的影响，以及4)为气候模式提出建议。

As solar radiation travels through the atmosphere it can interact with small particles known as aerosols. These particles can scatter and absorb solar radiation, which affects the amount of radiation that reaches the Earth's surface. Solar radiation interactions with aerosols can also affect the chemistry of the atmosphere, such as through the creation and destruction of ozone. To better improve understanding and modeling of these interactions, the research team will use data collected by research aircraft over the past two decades alongside numerical modeling to answer questions about how aerosols interact with solar radiation over a range of altitudes, solar angles, and geographic settings. The results of the project will help to improve climate models. Additional benefits will be the education and training of a graduate student and the development of a database that can be used by other researchers.The research team will improve understanding of the impact of tropospheric aerosols on actinic fluxes and atmospheric composition by integrating and analyzing observed spectral actinic fluxes. The NCAR Charged-coupled devices Actinic Flux Spectroradiometer (CAFS) has flown on numerous field campaigns over the past two decades and the measurements from CAFS plus aerosol characterization measurements offers a unique opportunity to examine the impact of aerosols on photochemistry. The CAFS data, along with concurrent sub-orbital and satellite data, and modeling will be used to address the four main objectives: 1) Develop a new Aerosol Attenuated Actinic Flux (AAAF) database, 2) Perform an in-depth analysis of actinic fluxes in different aerosol-laden conditions, 3) Perform an analysis of the impact of smoke aerosol on the photosynthetically available radiation (PAR) and the UV-direct radiative forcing, and 4) Develop recommendations for climate models.