Publications

Vadakke-chanat, S; Jamet, C; Lu, XM; Hu, YX (2025). Evaluation of CALIOP derived backscattering coefficient (bbp(532)) product over contrasted oceanic waters. OPTICS EXPRESS, 33(4), 6597-6614.

Abstract
CALIOP satellite sensor offers advantages over passive sensors, particularly during nighttime and in polar-subpolar regions. Though originally designed for atmospheric studies, it was adapted to retrieve the backscattering coefficient at 532 nm, bbp(532) in the ocean. Scarce matchups and the lack of standardized protocol hindered previous validation efforts. An evaluation using a standardized protocol and diverse in-situ datasets from contrasted oceanic waters was carried out for the period 2008-2021, with the 2018-2021 period being evaluated for the first time. A strong correlation was observed with R2 up to 0.94 (RMS: 0.001-0.01 m-1, MRE: 42.7%-63%, bias: 36.88%-13.09%). A comparison with MODIS-Aquabbp(532) product was performed showing comparable estimates of bbp(532). BGC-Argo data from 2018-2021 were also used to evaluate CALIOP bbp(532), revealing a lower correlation compared to 2008-2021 period, probably due to a decrease in CALIOP lidar power.

DOI:
10.1364/OE.539704

ISSN: