Radiometric approach for the detection of picophytoplankton assemblages across oceanic fronts

Lange, PK; Werdell, PJ; Erickson, Z; Dall'Olmo, G; Brewin, RJW; Zubkov, MV; Tarran, GA; Bouman, H; Slade, WH; Craig, S; Poulton, N; Bracher, A; Lomas, MW; Cetinic, I. 2020 Radiometric approach for the detection of picophytoplankton assemblages across oceanic fronts. Optics Express. 1-23. https://doi.org/10.1364/OE.398127

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Official URL: http://dx.doi.org/10.1364/OE.398127

Abstract/Summary

Cell abundances of Prochlorococcus, Synechococcus, and autotrophic picoeukaryotes were estimated in surface waters using principal component analysis (PCA) of hyperspectral and multispectral remote-sensing reflectance data. This involved the development of models that employed multilinear correlations between cell abundances across the Atlantic Ocean and a combination of PCA scores and sea surface temperatures. The models retrieve high Prochlorococcus abundances in the Equatorial Convergence Zone and show their numerical dominance in oceanic gyres, with decreases in Prochlorococcus abundances towards temperate waters where Synechococcus flourishes, and an emergence of picoeukaryotes in temperate waters. Fine-scale in-situ sampling across ocean fronts provided a large dynamic range of measurements for the training dataset, which resulted in the successful detection of fine-scale Synechococcus patches. Satellite implementation of the models showed good performance (R2> 0.50) when validated against in-situ data from six Atlantic Meridional Transect cruises. The improved relative performance of the hyperspectral models highlights the importance of future high spectral resolution satellite instruments, such as the NASA PACE mission’s Ocean Color Instrument, to extend our spatiotemporal knowledge about ecologically relevant phytoplankton assemblages

Item Type: Publication - Article
Divisions: Plymouth Marine Laboratory > National Capability categories > Atlantic Meridional Transect
Plymouth Marine Laboratory > National Capability categories > National Centre for Earth Observation
Plymouth Marine Laboratory > National Capability categories > Single Centre NC - CLASS
Plymouth Marine Laboratory > Science Areas > Earth Observation Science and Applications
Depositing User: S Hawkins
Date made live: 10 Aug 2020 12:56
Last Modified: 18 Aug 2020 10:49
URI: http://plymsea.ac.uk/id/eprint/9021

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