4.7 Article

Seasonal distributions of ocean particulate optical properties from spaceborne lidar measurements in Mediterranean and Black sea

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REMOTE SENSING OF ENVIRONMENT
卷 247, 期 -, 页码 -

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ELSEVIER SCIENCE INC
DOI: 10.1016/j.rse.2020.111889

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  1. Ocean Colour Thematic Assembly Centre of the Copernicus Marine Environment and Monitoring Service [77-CMEMS-TAC-OC]

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Assessing the oceanic surface layer's optical properties through CALIOP has been one of the reasons of the extension of the CALIOP mission for 3 more years (2018-2020). This is the first work evaluating the potential use of CALIOP for ocean applications at regional scale in mid-latitude regions (i.e. Mediterranean, MED, and Black Sea, BS) and investigating the added information on ocean particles given by the column integrated depolarization ratio (delta(T)) parameter. We implemented and refined a retrieval procedure to estimate this parameter at 1/4 degree of spatial resolution, comparing 7 years of CALIOP observations (2011-2017) to the corresponding Copernicus multi-sensor L3 ocean colour products of the surface particle backscattering coefficient (b(bp)) and chlorophyll-a concentration (Chl-a). This study pointed out that the current CALIOP sampling is inadequate to detect subtle day-night difference due to plankton diel variability for these basins. At a basin scale, delta(T) covaries with b(bp) for b(bp) >= 0.0015 m(-1). This is more evident for BS (R = 0.84) than for MED (R = 0.61). The analysis of seasonal distributions confirm this result for BS, where dT has a semi-annual cycle in very good agreement with bbp. In the MED, characterized by different trophic regimes, delta(T) shows also some similarities with Chl-a annual cycle. The combined characterization in the MED bioregions of the annual patterns of b(bp):Chl-a, delta(T):Chl-a and delta(T):b(bp) ratios suggested that delta(T) parameter can provide valuable information about the non-sphericity and the size of ocean particles.

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