Hoge Frank E
NASA Goddard Space Flight Center, Wallops Flight Facility, Building N-159, Wallops Island, Virginia 23337, USA.
Appl Opt. 2003 Dec 20;42(36):7197-201. doi: 10.1364/ao.42.007197.
Recent radiative transfer models show that: (1) regardless of elastic lidar receiver field of view (FOV), at vanishing lidar depth the lidar-derived attenuation coefficient klidar --> a, where a is the total absorption coefficient per meter of depth; and (2) for a wide FOV as the lidar sensing depth approaches some large value (depending on water type), klidar --> Kd, where Kd is the diffuse attenuation for downwelling irradiance. As a result, it is shown that a time-resolved, dual-wavelength-laser, elastic-backscattering lidar can retrieve the three principal oceanic optical properties: (1) the absorption coefficient of phytoplankton aph, (2) the absorption coefficient of chromophoric dissolved organic matter (CDOM) aCDOM, and (3) the nonwater total constituent backscattering coefficient bbt. The lidar-retrieved aph, aCDOM, and bbt inherent optical properties can be used to validate corresponding satellite-derived products such as those from terra moderate-resolution imaging spectroradiometer (MODIS), Aqua MODIS, Sea-viewing Wide Field-of-view Sensor, (SeaWiFS), and other ocean color sensors.
（1）无论弹性激光雷达接收器的视场（FOV）如何，在激光雷达深度趋近于零时，激光雷达得出的衰减系数klidar → a，其中a是每米深度的总吸收系数；（2）对于较宽的视场，当激光雷达探测深度接近某个较大值（取决于水体类型）时，klidar → Kd，其中Kd是下行辐照度的漫衰减。结果表明，一台时间分辨、双波长激光、弹性后向散射激光雷达能够反演三种主要的海洋光学特性：（1）浮游植物的吸收系数aph，（2）发色溶解有机物（CDOM）的吸收系数aCDOM，以及（3）非水体总成分后向散射系数bbt。激光雷达反演得到的aph、aCDOM和bbt等固有光学特性可用于验证相应的卫星衍生产品，如来自陆地中等分辨率成像光谱仪（MODIS）、水色卫星MODIS、宽视场海洋观测传感器（SeaWiFS）以及其他海洋颜色传感器的数据。
