The open-ocean missing backscattering is in the structural complexity of particles

Organelli, E; Dall’Olmo, G; Brewin, RJW; Tarran, GA; Boss, E; Bricaud, A. 2018 The open-ocean missing backscattering is in the structural complexity of particles. Nature Communications, 9 (1). https://doi.org/10.1038/s41467-018-07814-6

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Official URL: https://doi.org/10.1038/s41467-018-07814-6

Abstract/Summary

Marine microscopic particles profoundly impact global biogeochemical cycles, but our understanding of their dynamics is hindered by lack of observations. To fill this gap, optical backscattering measured by satellite sensors and in-situ autonomous platforms can be exploited. Unfortunately, these observations remain critically limited by an incomplete mechanistic understanding of what particles generate the backscattering signal. To achieve this understanding, optical models are employed. The simplest of these models—the homogeneous sphere—severely underestimates the measured backscattering and the missing signal has been attributed to submicron particles. This issue is known as the missing backscattering enigma. Here we show that a slightly more complex optical model—the coated sphere—can predict the measured backscattering and suggests that most of the signal comes from particles >1 µm. These findings were confirmed by independent size-fractionation experiments. Our results demonstrate that the structural complexity of particles is critical to understand open-ocean backscattering and contribute to solving the enigma.

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 > Science Areas > Earth Observation Science and Applications
Depositing User: Kim Hockley
Date made live: 19 Dec 2018 16:00
Last Modified: 02 Jan 2019 09:25
URI: http://plymsea.ac.uk/id/eprint/8074

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