http://www.cnr.it/ontology/cnr/individuo/prodotto/ID211017

Response of the deep chlorophyll maximum to fluctuations in vertical mixing intensity (Articolo in rivista)

Type

Articolo in rivista (Classe)
Prodotto della ricerca (Classe)

Label

Response of the deep chlorophyll maximum to fluctuations in vertical mixing intensity (Articolo in rivista) (literal)

Anno

2013-01-01T00:00:00+01:00 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi

10.1016/j.pocean.2012.09.004 (literal)

Alternative label

Antonella Liccardo, Annalisa Fierro, Daniele Iudicone, Pascale Bouruet-Aubertot, and Laurent Dubroca (2013)
Response of the deep chlorophyll maximum to fluctuations in vertical mixing intensity
in Progress in Oceanography; Pergamon-Elsevier Science Ltd., Oxford (Regno Unito)
(literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori

Antonella Liccardo, Annalisa Fierro, Daniele Iudicone, Pascale Bouruet-Aubertot, and Laurent Dubroca (literal)

Pagina inizio

33 (literal)

Pagina fine

46 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#url

http://www.sciencedirect.com/science/article/pii/S0079661112001139 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume

109 (literal)

Rivista

Progress in Oceanography (Rivista)

Note

ISI Web of Science (WOS) (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni

[ 1 ] Univ Naples Federico II, Dipartimento Sci Fis, I-80126 Naples, Italy [ 2 ] INFN, Sez Napoli, I-80126 Naples, Italy [ 3 ] Univ Naples Federico II, CNR SPIN, I-80126 Naples, Italy [ 4 ] Univ Naples Federico II, Dipartimento Sci Fis, I-80126 Naples, Italy [ 5 ] Stn Zool Anton Dohrn, Naples, Italy [ 6 ] UPMC, LOCEAN, Paris, France (literal)

Titolo

Response of the deep chlorophyll maximum to fluctuations in vertical mixing intensity (literal)

Abstract

Extreme atmospheric events, such as storms, can temporarily increase the vertical diffusivity in the upper ocean by several orders of magnitude, causing variability in the deep chlorophyll maximum (DCM). In this study, we investigate the impact of intermittent vertical mixing on the deep chlorophyll maximum. For this purpose, we analyze a one-dimensional phytoplankton-nutrient model exposed to short-term fluctuations in vertical diffusivity generated by internal waves. As a first step, we use singular perturbations to analyze the impact of a single burst of turbulence on the DCM characteristics. The simulations show that the DCM exhibits a long transient response, even after a single short perturbation. In particular, a single burst of turbulence (i) spreads out the DCM, thereby reducing the local phytoplankton maximum, and (ii) gives rise to a diffusion-driven enhancement of nutrient availability, producing a temporary increase in the phytoplankton growth rates at and above the DCM. Subsequently, we introduce a realistic annual sequence of fluctuations in vertical diffusivity in our model, and we also incorporate the seasonal cycle of light conditions. Fluctuations in vertical diffusivity were derived from high-resolution measurements from the POMME experiment in the north-east Atlantic Ocean, where the contribution of internal waves to the variation in vertical mixing has been characterized for more than one year. The annual light cycle, in combination with intermittent vertical mixing, leads to the superposition of a series of complex dynamical responses. At seasonal and shorter time scales, the vertically integrated productivity is temporally augmented by periods of medium/high diffusivity. Seasonal variation in light availability modifies the DCM response to mixing variability. (C) 2012 Elsevier Ltd. All rights reserved. (literal)

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