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Retrieving seawater-backscattering profiles from coupling Raman and elastic lidar data

机译：通过耦合拉曼光谱和弹性激光雷达数据获取海水反向散射剖面

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摘要

We propose a technique for retrieving seawater-backscattering profiles that is based on the joint use of elastic and Raman lidar returns. We suggest using two lidar channels: the Raman channel and the elastic channel with a light frequency equal to a half-sum of initial and Raman-shifted frequencies of the Raman channel. These specific wavelengths provide the same attenuation laws for elastic and Raman signals if absorption and scattering spectra can be approximated by a power law. In particular, seawater supplies such a possibility in the region of 400-500 nm if extremely bioproductive waters are not considered and the chlorophyll absorption peak at 440 nm does not come out of the background of dissolved organic matter absorption. With these specific initial wavelengths, the elastic and Raman lidar returns differ only in the backscattering coefficients. Because the Raman-backscattering coefficient is constant along the profile, the (elastic-to-Raman) ratio of these lidar returns directly produces the profile of the elastic-backscattering coefficient. This technique stays valid even under multiple-scattering conditions, which is of great importance for seawater sounding.
机译：我们基于弹性和拉曼激光雷达回波的联合使用，提出了一种获取海水反向散射剖面的技术。我们建议使用两个激光雷达通道：拉曼通道和弹性通道，光频率等于拉曼通道初始频率和拉曼位移频率的一半。如果吸收和散射光谱可以通过幂律近似，则这些特定的波长为弹性和拉曼信号提供相同的衰减定律。特别是，如果不考虑具有极高生物生产力的水，并且在440 nm处的叶绿素吸收峰不会脱离溶解有机物吸收的背景，那么海水将在400-500 nm范围内提供这种可能性。对于这些特定的初始波长，弹性和拉曼激光雷达的回波仅在后向散射系数上有所不同。因为拉曼后向散射系数沿轮廓是恒定的，所以这些激光雷达回波的（弹性与拉曼）比值直接产生了弹性后向散射系数的轮廓。该技术即使在多重散射条件下也仍然有效，这对于海水探测非常重要。

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