Concentrations of organic carbon, nitrogen and phosphorus on vertical profiles in waters of the tropical North Atlantic in March 2002

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Autori principali:	Dietze, Heiner, Oschlies, Andreas, Kähler, Paul
Natura:	Dataset Open Access
Lingua:	en
Pubblicazione:	PANGAEA 2008
Soggetti:	Bottle, Niskin 10-L; NIS_10L; North Atlantic Ocean; POS284; POS284_148; POS284_156; POS284_157; POS284_158; POS284_159; POS284_167; POS284_169; POS284_171; POS284_173; POS284_183; Poseidon
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_version_	1867167660136988672
author	Dietze, Heiner Oschlies, Andreas Kähler, Paul
author_facet	Dietze, Heiner Oschlies, Andreas Kähler, Paul
collection	Datos científicos de ciencias marinas y ambientales
contents	In the literature, an inconsistency exists between estimates of biotically-effected carbon export inferred from large-scale geochemical studies (Jenkins 1982; 47 gC m–2 a–1) and local measurements of turbulent nutrient supply (Lewis et al. 1986; 4 gC m–2 a–1) in the eastern subtropical North Atlantic. Nutrient supply to the upper ocean by turbulent mixing is reexamined using local standard oceanographic measurements and high-resolution vertical profiles of nutrients averaged over a large region directly comparable to that investigated by Jenkins (1982). Turbulent fluxes induced by internal waves and salt fingering, respectively, are separated according to Gregg (1989) and Zhang et al. (1998). Nutrient transport into the nutrient-consuming surface layer by salt fingering is more than fivefold higher than transport due to internal-wave induced turbulence. Still, this cannot resolve the above- mentioned apparent inconsistency, even if additional physical transport mechanisms such as eddy pumping, advection and horizontal diffusion are accounted for. Estimated nitrate fluxes due to vertical turbulent diffusion are 0.05–0.15 mol m-2 a-1, corresponding to 4–11 gC m-2 a-1. Observed NO3/PO4 turbulent flux ratios of up to 23 are interpreted as the imprint of N2 fixation.
format	Dataset Open Access
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language	en
publishDate	2008
publisher	PANGAEA
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spellingShingle	Concentrations of organic carbon, nitrogen and phosphorus on vertical profiles in waters of the tropical North Atlantic in March 2002 Dietze, Heiner Oschlies, Andreas Kähler, Paul Bottle, Niskin 10-L; NIS_10L; North Atlantic Ocean; POS284; POS284_148; POS284_156; POS284_157; POS284_158; POS284_159; POS284_167; POS284_169; POS284_171; POS284_173; POS284_183; Poseidon In the literature, an inconsistency exists between estimates of biotically-effected carbon export inferred from large-scale geochemical studies (Jenkins 1982; 47 gC m–2 a–1) and local measurements of turbulent nutrient supply (Lewis et al. 1986; 4 gC m–2 a–1) in the eastern subtropical North Atlantic. Nutrient supply to the upper ocean by turbulent mixing is reexamined using local standard oceanographic measurements and high-resolution vertical profiles of nutrients averaged over a large region directly comparable to that investigated by Jenkins (1982). Turbulent fluxes induced by internal waves and salt fingering, respectively, are separated according to Gregg (1989) and Zhang et al. (1998). Nutrient transport into the nutrient-consuming surface layer by salt fingering is more than fivefold higher than transport due to internal-wave induced turbulence. Still, this cannot resolve the above- mentioned apparent inconsistency, even if additional physical transport mechanisms such as eddy pumping, advection and horizontal diffusion are accounted for. Estimated nitrate fluxes due to vertical turbulent diffusion are 0.05–0.15 mol m-2 a-1, corresponding to 4–11 gC m-2 a-1. Observed NO3/PO4 turbulent flux ratios of up to 23 are interpreted as the imprint of N2 fixation.
title	Concentrations of organic carbon, nitrogen and phosphorus on vertical profiles in waters of the tropical North Atlantic in March 2002
topic	Bottle, Niskin 10-L; NIS_10L; North Atlantic Ocean; POS284; POS284_148; POS284_156; POS284_157; POS284_158; POS284_159; POS284_167; POS284_169; POS284_171; POS284_173; POS284_183; Poseidon
url	https://doi.org/10.1594/PANGAEA.696302

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