Details for ISR Implementation of ocean optics protocols to estimate spectral absorption coefficients of particles, suspended matters and phytoplankton pigments in ALOMEx'15 water samples: results and comparisons with satellite measurements

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Name:ISR Implementation of ocean optics protocols to estimate spectral absorption coefficients of particles, suspended matters and phytoplankton pigments in ALOMEx'15 water samples: results and comparisons with satellite measurements
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ISR Implementation of ocean optics protocols to estimate spectral absorption coefficients of particles, suspended matters and phytoplankton pigments in ALOMEx'15 water samples: results and comparisons with satellite measurements. Pennucci, Giuliana; Sanjuan Calzado, Violeta. CMRE-MR-2016-021. March 2017.

One of the main requirements for a comprehensive characterisation of water column optical properties is the simultaneous acquisition of physical and biological parameters that are traditionally observed using satellites, laser systems, ships and moorings, especially in dynamic areas. The Atlantic Lidar Optical Measurements Experiment 2015 (ALOMEx'15), conducted from 31 October to 12 November 2015 the Alboran Sea and Sahara Upwelling, provided an attempt at determining in situ measurement uncertainties by comparing instrument specific calibrations and measurement protocols. In this context, two different topics have been addressed in this report: (1) post- processing algorithms development to analyse optical water column properties and (2) data comparison and validation using satellite imagery. Specifically, introduction and conventions are provided in the first part of this document (Sections 1 and 2), while the post-processing algorithms which were implemented at CMRE to analyse bio-optical and radiometric measurements performed simultaneously with the Lidar system and optical satellite data (i.e. from the Moderate Resolution Imaging Spectroradiometer, MODIS, and the Visible Infrared Imaging Radiometer Suite, VIIRS) are described in Section 3. The dataset retrieved from the available in situ water samples (Section 4) is successively used to investigate the ubiquity of optical linkages between the ocean and atmosphere at the global scale using data acquired during a Saharan dust phenomenon that occurred during the cruise. We analysed match-ups comparison between coincident (+/- 1hour) in situ and satellite retrievals, as well as historical satellite measurements to investigate the seasonal variability (Section 5). Results corroborate the hypothesis that the biasing of satellite chlorophyll-a retrievals are correlated with high deposited dust concentrations and may help climatologists to understand the impact of aerosols on correction for satellite ocean data, leading to better ocean colour products (e.g. atmospheric correction and ocean colour algorithms), especially in the presence of dust or other anthropogenic pollutants comparing.

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Created On: 04/24/2017 08:50
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