中国西北地区气溶胶单次散射反照率与直接辐射强迫精细反演及演变趋势研究

Aerosols play a key role in global climate change and its uncertainty impact on global climate change must be resolved. Northwest desert region in China is important dust aerosol source region of Asia and the world, the dust aerosol radiative forcing can not be ignored. The precise uantification of the regional dust aerosol direct radiative forcing and its evolution trend, will help to reduce dust aerosol’s uncertainty on climate change. Mainly surface in Northwest China are desert and Gobi-based, also include a variety of surface features sparse vegetation, snow and cities. Remote sensing observation have much difficulties because of the high surface albedo in this region. This study will use the normalization method to obtain accurate light background albedo in Northwest China by using multi-source satellite products based on the original work, improve surface albedo and related parameters in SBDART model and the accuracy of model inversion. System inversion of aerosol single scattering albedo and aerosol direct radiative forcing with ground observation and multi-source remote sensing data in Northwest China will be retrieved. Characters and Trends of aerosol optical radiation characteristics in recent years in Northwest China will be got on this work, which can provide valuable observations and findings for the study of radiation effects of dust aerosol on climate change.

气溶胶在全球气候变化中起着关键作用，其对全球气候变化影响的不确定性亟待解决。我国西北荒漠区域是亚洲乃至全球重要的沙尘气溶胶源区，沙尘气溶胶对辐射强迫的影响不容忽视，精确量化该区域沙尘气溶胶直接辐射强迫及其演变趋势，将有助于降低我国沙尘气溶胶气候效应研究的不确定性。西北区域地表以沙漠、戈壁为主，也包含稀疏植被、积雪和城市等多种地表特征，地表反照率高，遥感观测难度大。本研究拟在原有工作基础上，采用归一化方法基于多源卫星产品精确获取我国西北地区亮背景地表反照率，改进SBDART辐射传输模式地表反照率及相关参数，提升模式反演精度；利用地基联网观测与多源卫星遥感资料，系统反演获取我国西北典型区域气溶胶单次散射反照率与气溶胶直接辐射强迫；揭示近年来我国西北气溶胶光学辐射特性的演变特征与趋势，为我国沙尘气溶胶气候辐射效应研究提供有价值的观测数据和研究结果。