This study explores the maximum bathymetric capabilities of the ICESat-2 in coastal environments, with a particular focus on the impact of cirrus cloud thickness. Utilizing MODTRAN simulations for atmospheric transmittance under various cloud conditions, we integrate these with a maximum bathymetric depth model to quantitatively assess this impact. Our results indicate a significant decrease in detection depth with increasing cloud thickness, culminating in complete signal attenuation at cloud thicknesses of 3-4 km. Furthermore, simulations reveal that the FF phase function model outperforms OTHG and TTHG models, exhibiting the lowest Mean Absolute Error (MAE) and Mean Relative Error (MRE) in the Puerto Rico and Virgin Islands study sub-areas. This research provides critical insights into the capabilities and limitations of spaceborne lidar in coastal bathymetry, highlighting the importance of atmospheric conditions in remote sensing applications.
Atmospheric aerosols have a significant impact on the earth's environment and climate, directly or indirectly affecting human production and life. The high-precision detection of atmospheric aerosol characteristics plays a fundamental guiding role in systematically studying climate and meteorology. By actively emitting laser light and receiving backscattered signals, the atmospheric parameter profile in the detection direction can be obtained, which gives lidar the advantage of high temporal and spatial resolution. Among the lidars, the high-spectral-resolution lidar (HSRL) has high signal-to-noise ratio, and can realize high-precision day and night observation. It has great scientific potential in studying scientific issues such as aerosol transmission mechanisms, cloud-aerosol interaction process, etc. This paper reports a ground-based HSRL based on iodine molecular absorption cell developed by Zhejiang University. The basic principle and hardware system structure of the HSRL are introduced in the paper. This lidar provides vertical profiles of aerosol scattering ratio together with lidar ratio and particle depolarization ratio at 532 nm. In the field observation experiment carried out in Beijing, the lidar was compared with instruments such as sun photometer and Raman lidar. The field experimental have proved that the observation results of the HSRL developed are in good agreement with the sun photometer, which verifies the accuracy of the HSRL's daytime observations. In the comparative observation experiment with Raman radar, the night data has a high degree of consistency, and the HSRL can obtain a better signal-to-noise ratio in daytime, which verifies the great value of the HSRL in atmospheric detection.
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