星载海洋激光雷达叶绿素剖面探测能力估算

为了评估和分析星载海洋激光雷达探测全球海洋光学参数的性能,依据激光雷达方程和蒙特卡罗模型结果模拟计算激光传输信号,开发了星载海洋激光雷达仿真模拟系统。仿真模拟系统由正向模拟、数据反演与误差分析三部分组成,能够模拟激光发射、传输和探测的全过程。根据给定的激光雷达参数,模拟了443 nm、486.1 nm和532 nm波长在地中海、印度洋、南大洋与太平洋四个典型海区的探测信号。研究结果表明,443 nm和486 nm波长的探测深度在各个海区均比较接近,并且均比532 nm更深。在给定的激光雷达参数情况下,486.1 nm波长在太平洋和南大洋的探测深度分别为120 m和70 m,在地中海和印度洋的探测深度均为约100 m。叶绿素a浓度在以上海区的探测深度分别约为80 m、50 m和70 m。

Estimation of chlorophyll profile detection capability of spaceborne oceanographic lidar

In order to evaluate and analyze performance of spaceborne oceanographic lidar for global ocean optical properties detection, a simulation system for spaceborne oceanographic lidar was developed based on lidar equation and the results of Monte Carlo simulation model. The lidar simulation system consisted of three modules, forward simulation, data inversion and error analysis, which could simulate the whole process of laser emission, transmission and detection. According to the given lidar parameters, the detection signals of 443 nm, 486.1 nm and 532 nm in four typical areas, Mediterranean Sea, Indian Ocean, Southern Ocean and Pacific Ocean, were simulated. The results show that the detection depths of 443 nm and 486 nm are approximately the same and deeper than that of 532 nm. For the given lidar parameters, the detection depths of 486.1 nm wavelength in the Pacific Ocean and the Southern Ocean are 120 m and 70 m, respectively, and the detection depth in the Mediterranean Sea and the Indian Ocean is about 100 m. The detection depths of chlorophyll-a concentration in the above sea areas are about 80 m, 50 m and 70 m, respectively.