Eulerian and Lagrangian properties of biophysical intermittency in the ocean
Identifieur interne : 000F54 ( Istex/Curation ); précédent : 000F53; suivant : 000F55Eulerian and Lagrangian properties of biophysical intermittency in the ocean
Auteurs : Laurent Seuront [France, Australie] ; François G. Schmitt [France]Source :
- Geophysical Research Letters [ 0094-8276 ] ; 2004-02.
Descripteurs français
- Wicri :
- topic : Biomasse.
English descriptors
- KwdEn :
- Biological activity, Biomass, Biophysical intermittency, Brownian motion, Characteristic time scale, Eastern english channel, Energy dissipation, Eulerian, Eulerian slope, Exponent, Fluctuation, Intermittency, Lagrangian, Lagrangian fluorescence, Lagrangian framework, Lagrangian frameworks, Lagrangian intermittency, Lagrangian properties, Lagrangian regimes, Lagrangian turbulence, Moment function, Multifractal, Multifractal analysis, Multifractal parameters, Multifractal properties, Multiscaling laws, Multiscaling properties, Nonlinear, Ocean temperature, Passive scalars, Phys, Phytoplankton, Phytoplankton biomass, Phytoplankton concentration, Phytoplankton distribution, Phytoplankton fields, Preliminary results, Salinity, Same size, Sampling experiments, Scalar, Scalar variance flux, Schmitt, Seuront, Small scales, Specific behavior, Spectral slope, Station marine, Structure functions, Surface waves, Temperature field, Temperature fluctuations, Temperature structure functions, Time scale, Time scales, Time series, Turbulence, Turbulent flow, Turbulent structures, Vivo fluorescence.
- Teeft :
- Biological activity, Biomass, Biophysical intermittency, Brownian motion, Characteristic time scale, Eastern english channel, Energy dissipation, Eulerian, Eulerian slope, Exponent, Fluctuation, Intermittency, Lagrangian, Lagrangian fluorescence, Lagrangian framework, Lagrangian frameworks, Lagrangian intermittency, Lagrangian properties, Lagrangian regimes, Lagrangian turbulence, Moment function, Multifractal, Multifractal analysis, Multifractal parameters, Multifractal properties, Multiscaling laws, Multiscaling properties, Nonlinear, Ocean temperature, Passive scalars, Phys, Phytoplankton, Phytoplankton biomass, Phytoplankton concentration, Phytoplankton distribution, Phytoplankton fields, Preliminary results, Salinity, Same size, Sampling experiments, Scalar, Scalar variance flux, Schmitt, Seuront, Small scales, Specific behavior, Spectral slope, Station marine, Structure functions, Surface waves, Temperature field, Temperature fluctuations, Temperature structure functions, Time scale, Time scales, Time series, Turbulence, Turbulent flow, Turbulent structures, Vivo fluorescence.
Abstract
Eulerian and Lagrangian characteristics of simultaneously recorded temperature, salinity and phytoplankton biomass time series are investigated over a seasonal cycle. Time series are analyzed in the spectral and multifractal scaling frameworks. We show that passive scalar time series (temperature and salinity) are characterized by scaling laws representative of Eulerian and Lagrangian turbulence. The two different regimes identified are separated by a transition linked to the characteristic scale of turbulent structures of the same size as the boat. While the scaling behavior exhibited by phytoplankton biomass fluctuations is close to the expected passive scalar behavior over Eulerian scales, it is quite far from it over Lagrangian scales. For these scales, the observed scaling behavior exhibits a significant density‐dependence, indicative of biological activity.
Url:
DOI: 10.1029/2003GL018185
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Schmitt</name><affiliation wicri:level="1"><mods:affiliation>CNRS, UMR ELICO, Station Marine de Wimereux, Université des Sciences et Technologies de Lille, France</mods:affiliation><country xml:lang="fr">France</country><wicri:regionArea>CNRS, UMR ELICO, Station Marine de Wimereux, Université des Sciences et Technologies de Lille</wicri:regionArea></affiliation></author></analytic><monogr></monogr><series><title level="j" type="main">Geophysical Research Letters</title><title level="j" type="alt">GEOPHYSICAL RESEARCH LETTERS</title><idno type="ISSN">0094-8276</idno><idno type="eISSN">1944-8007</idno><imprint><biblScope unit="vol">31</biblScope><biblScope unit="issue">3</biblScope><biblScope unit="page-count">4</biblScope><date type="published" when="2004-02">2004-02</date></imprint><idno type="ISSN">0094-8276</idno></series></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0094-8276</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Biological activity</term><term>Biomass</term><term>Biophysical intermittency</term><term>Brownian motion</term><term>Characteristic time scale</term><term>Eastern english channel</term><term>Energy dissipation</term><term>Eulerian</term><term>Eulerian slope</term><term>Exponent</term><term>Fluctuation</term><term>Intermittency</term><term>Lagrangian</term><term>Lagrangian fluorescence</term><term>Lagrangian framework</term><term>Lagrangian frameworks</term><term>Lagrangian intermittency</term><term>Lagrangian properties</term><term>Lagrangian regimes</term><term>Lagrangian turbulence</term><term>Moment function</term><term>Multifractal</term><term>Multifractal analysis</term><term>Multifractal parameters</term><term>Multifractal properties</term><term>Multiscaling laws</term><term>Multiscaling properties</term><term>Nonlinear</term><term>Ocean temperature</term><term>Passive scalars</term><term>Phys</term><term>Phytoplankton</term><term>Phytoplankton biomass</term><term>Phytoplankton concentration</term><term>Phytoplankton distribution</term><term>Phytoplankton fields</term><term>Preliminary results</term><term>Salinity</term><term>Same size</term><term>Sampling experiments</term><term>Scalar</term><term>Scalar variance flux</term><term>Schmitt</term><term>Seuront</term><term>Small scales</term><term>Specific behavior</term><term>Spectral slope</term><term>Station marine</term><term>Structure functions</term><term>Surface waves</term><term>Temperature field</term><term>Temperature fluctuations</term><term>Temperature structure functions</term><term>Time scale</term><term>Time scales</term><term>Time series</term><term>Turbulence</term><term>Turbulent flow</term><term>Turbulent structures</term><term>Vivo fluorescence</term></keywords><keywords scheme="Teeft" xml:lang="en"><term>Biological activity</term><term>Biomass</term><term>Biophysical intermittency</term><term>Brownian motion</term><term>Characteristic time scale</term><term>Eastern english channel</term><term>Energy dissipation</term><term>Eulerian</term><term>Eulerian slope</term><term>Exponent</term><term>Fluctuation</term><term>Intermittency</term><term>Lagrangian</term><term>Lagrangian fluorescence</term><term>Lagrangian framework</term><term>Lagrangian frameworks</term><term>Lagrangian intermittency</term><term>Lagrangian properties</term><term>Lagrangian regimes</term><term>Lagrangian turbulence</term><term>Moment function</term><term>Multifractal</term><term>Multifractal analysis</term><term>Multifractal parameters</term><term>Multifractal properties</term><term>Multiscaling laws</term><term>Multiscaling properties</term><term>Nonlinear</term><term>Ocean temperature</term><term>Passive scalars</term><term>Phys</term><term>Phytoplankton</term><term>Phytoplankton biomass</term><term>Phytoplankton concentration</term><term>Phytoplankton distribution</term><term>Phytoplankton fields</term><term>Preliminary results</term><term>Salinity</term><term>Same size</term><term>Sampling experiments</term><term>Scalar</term><term>Scalar variance flux</term><term>Schmitt</term><term>Seuront</term><term>Small scales</term><term>Specific behavior</term><term>Spectral slope</term><term>Station marine</term><term>Structure functions</term><term>Surface waves</term><term>Temperature field</term><term>Temperature fluctuations</term><term>Temperature structure functions</term><term>Time scale</term><term>Time scales</term><term>Time series</term><term>Turbulence</term><term>Turbulent flow</term><term>Turbulent structures</term><term>Vivo fluorescence</term></keywords><keywords scheme="Wicri" type="topic" xml:lang="fr"><term>Biomasse</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract">Eulerian and Lagrangian characteristics of simultaneously recorded temperature, salinity and phytoplankton biomass time series are investigated over a seasonal cycle. Time series are analyzed in the spectral and multifractal scaling frameworks. We show that passive scalar time series (temperature and salinity) are characterized by scaling laws representative of Eulerian and Lagrangian turbulence. The two different regimes identified are separated by a transition linked to the characteristic scale of turbulent structures of the same size as the boat. While the scaling behavior exhibited by phytoplankton biomass fluctuations is close to the expected passive scalar behavior over Eulerian scales, it is quite far from it over Lagrangian scales. For these scales, the observed scaling behavior exhibits a significant density‐dependence, indicative of biological activity.</div></front></TEI></record>Pour manipuler ce document sous Unix (Dilib)
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