Abstract
New applications on global-scale plankton retrievals using the CALIOP (Cloud-Aerosol Lidar with orthogonal Polarization) lidar measurements on the CALIPSO (Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations) satellite recently suggested that space-based lidars could provide information about the depth distribution of optical scattering. Assessing the oceanic surface layer’s optical properties through CALIOP is one of the reasons of the extension of the CALIOP mission for another 3 years (2018-2020). The objective of this work is the evaluation of the potential CALIOP ocean products in the Mediterranean and Black seas using the ocean color products provided by the Copernicus Marine Environment Monitoring Systems (CMEMS).
Highlights
The Lidar active remote sensing technique constitutes a highly reliable tool of investigating the marine environment
Lidar sensors operate in a range of conditions that are highly complementary to ocean color passive observations: under any lighting conditions; between broken cloud and through tenuous cloud; and through significant overlying aerosol loading with no need for complex correction algorithms
Though originally designed for retrieving spatial and optical properties of clouds and aerosols, new applications on global-scale plankton retrievals using CALIOP (Cloud-Aerosol Lidar with Orthogonal Polarization) measurements suggested that space-based Lidars can provide information about the depth distribution of optical scattering
Summary
The Lidar active remote sensing technique constitutes a highly reliable tool of investigating the marine environment. This technique allows detecting and determining the spatial and quantitative distributions of several optical and physical parameters of seawater with good resolution and accuracy at long distances. The surface hemispheric backscattering coefficients (bbp) at 532 nm (CALIOP emission wavelength) was estimated using the ratio between the cross-polarization and co-polarization channels. Despite these results, this new application for ocean retrievals has limitations and uncertainties that need to be further assessed and estimated
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