Lu Xiaomei, Hu Yongxiang, Yang Yuekui, Vaughan Mark, Liu Zhaoyan, Rodier Sharon, Hunt Bill, Lucker Patricia, Trepte Charles
Science Systems and Applications, Inc., Hampton, VA, 23666, USA.
NASA Langley Research Center, Hampton, VA, 23681, USA.
Atmos Meas Tech. 2018 Jun;11(6):3281-3296. doi: 10.5194/amt-11-3281-2018. Epub 2018 Jun 8.
This paper presents an innovative retrieval method that translate the CALIOP land surface laser pulse returns into the surface bidirectional reflectance. To better analyze the surface returns, the CALIOP receiver impulse response and the downlinked samples' distribution at 30 m resolution are discussed. The saturated laser pulse returns from snow and ice surfaces are recovered based on surface tail information. The retrieved snow surface bidirectional reflectance is compared with reflectance from both CALIOP cloud cover regions and MODIS BRDF/Albedo model parameters. Besides the surface bidirectional reflectance, the column top-of-atmosphere bidirectional reflectance is calculated from the CALIOP lidar background data. It is compared with bidirectional reflectance from WFC radiance measurements. The retrieved CALIOP surface bidirectional reflectance and column top-of-atmosphere bidirectional reflectance results provide unique information to complement existing MODIS standard data products and would have valuable applications for modellers.
本文提出了一种创新的检索方法，可将云-气溶胶激光雷达和红外探路者（CALIOP）陆地表面激光脉冲回波转换为表面双向反射率。为了更好地分析表面回波，讨论了CALIOP接收器脉冲响应以及30米分辨率下的下行链路样本分布。基于表面尾部信息恢复了来自冰雪表面的饱和激光脉冲回波。将反演得到的雪面双向反射率与CALIOP云层覆盖区域的反射率以及中分辨率成像光谱仪（MODIS）的双向反射分布函数/反照率模型参数进行了比较。除了表面双向反射率外，还根据CALIOP激光雷达背景数据计算了柱顶大气双向反射率。将其与广角相机（WFC）辐射测量得到的双向反射率进行了比较。反演得到的CALIOP表面双向反射率和柱顶大气双向反射率结果提供了独特的信息，以补充现有的MODIS标准数据产品，并且对建模人员具有重要的应用价值。
