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Title: Magnitude of nitrate turbulent diffusion in contrasting marine environments
Authors: Mouriño-Carballido, Beatriz
Otero Ferrer, José Luis
Fernández Castro, Bieito
Marañón, Emilio
Blazquez Maseda, Mariña
Aguiar González, Miguel 
Chouciño, Paloma
Graña, Rocío
Moreira-Coello, Víctor
Villamaña, Marina
UNESCO Clasification: 241705 Biología marina
251007 Oceanografía física
Keywords: Marine biology
Physical oceanography
Issue Date: 2021
Project: Expedición de circunnavegación MALASPINA 2010: Cambio global y exploración del océano global 
Tropical and South Atlantic - climate-based marine ecosystem prediction for sustainable management 
Journal: Scientific Reports 
Abstract: Difficulties to quantify ocean turbulence have limited our knowledge about the magnitude and variability of nitrate turbulent diffusion, which constitutes one of the main processes responsible for the supply of nitrogen to phytoplankton inhabiting the euphotic zone. We use an extensive dataset of microturbulence observations collected in contrasting oceanic regions, to build a model for nitrate diffusion into the euphotic zone, and obtain the first global map for the distribution of this process. A model including two predictors (surface temperature and nitrate vertical gradient) explained 50% of the variance in the nitrate diffusive flux. This model was applied to climatological data to predict nitrate diffusion in oligotrophic mid and low latitude regions. Mean nitrate diffusion (~ 20 Tmol N y−1) was comparable to nitrate entrainment due to seasonal mixed-layer deepening between 40°N–40ºS, and to the sum of global estimates of nitrogen fixation, fluvial fluxes and atmospheric deposition. These results indicate that nitrate diffusion represents one of the major sources of new nitrogen into the surface ocean in these regions.
ISSN: 2045-2322
DOI: 10.1038/s41598-021-97731-4
Source: Scientific Reports[EISSN 2045-2322],v. 11 (1), (Diciembre 2021)
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