An Analysis of Intermittency, Scaling, and Surface renewal in Atmosphere Surface Layer Turbulence (Articolo in rivista)

Type

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

Label

• An Analysis of Intermittency, Scaling, and Surface renewal in Atmosphere Surface Layer Turbulence (Articolo in rivista) (literal)

Anno

• 2006-01-01T00:00:00+01:00 (literal)

Alternative label

• Katul G.; Porporato A.; Cava D.; and Siqueira M. (2006)
  An Analysis of Intermittency, Scaling, and Surface renewal in Atmosphere Surface Layer Turbulence
  in Physica. D, Nonlinear phenomena (Print)
  (literal)

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

• Katul G.; Porporato A.; Cava D.; and Siqueira M. (literal)

Pagina inizio

• 117 (literal)

Pagina fine

• 126 (literal)

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

• 215 (literal)

Rivista

• Physica. D, Nonlinear phenomena (Rivista)

Note

• ISI Web of Science (WOS) (literal)

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

• Nicholas School of the Environment and Earth Sciences, Box 90328, Duke University, Durham, North Carolina, USA Department of Civil and Environmental Engineering, Box 90328, Duke University, Durham, North Carolina, USA CNR Institute of Atmosphere Sciences and Climate U.O of Lecce, Italy (literal)

Titolo

• An Analysis of Intermittency, Scaling, and Surface renewal in Atmosphere Surface Layer Turbulence (literal)

Abstract

• Turbulent velocity and scalar concentration time series were collected in the atmosphere above ice, a grass-covered surface, and a southern pine forest, and were then analyzed using Tsallis's non-extensive thermostatistics. While theoretical links between the Tsallis's non-extensive thermostatistics and Navier-stokes turbulence remain questionable, the Tsallis distribution provide a unifying framework to investigate two inter-connected problems: similarity between scalars and velocity statistics within the inertial subrange, and \"contamination\" of internal intermittency by \"external\" factors. We showed that \"internal\" intermittency models, including the She-Leveque, Lognormal, and Log-stable reproduce well the observed Tsallis parameters for velocity within the inertial subrange at all three sites, but not scalars. Within the Tsallis framework, scalars appear more intermittent than velocity when the underlying surface is a large source or sink. The dissimilarity in statistics between velocity and scalars within the inertial subrange were shown to be strongly dependent on \"external\" intermittency. The genesis of \"external\" intermittency for scalars was linked to the classical Higbie surface renewal process and scalar source strength. Surface renewal leads to a ramp-like pattern with a rise-phase, on the order of the integral scale, and a sharp drop that impacts the Tsallis distributional tails at the small scales. Implications to \"scalar turbulence\" models are also discussed in the context of biosphere-atmosphere CO2 exchange. (literal)

Prodotto di

• Processi di scambio e strato limite atmosferico (TA.P06.017.002) (Modulo)
• Institute of atmospheric sciences and climate (ISAC) (Istituto)
• Processi in atmosfera (TA.P06.017.001) (Modulo)

Autore CNR

• DANIELA CAVA (Persona)

Insieme di parole chiave

• Parole chiave di "An Analysis of Intermittency, Scaling, and Surface renewal in Atmosphere Surface Layer Turbulence" (Insieme di parole chiave)

Incoming links:

Prodotto

• Institute of atmospheric sciences and climate (ISAC) (Istituto)
• Processi di scambio e strato limite atmosferico (TA.P06.017.002) (Modulo)
• Processi in atmosfera (TA.P06.017.001) (Modulo)

Autore CNR di

• DANIELA CAVA (Persona)

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

• Physica. D, Nonlinear phenomena (Rivista)

Insieme di parole chiave di

• Parole chiave di "An Analysis of Intermittency, Scaling, and Surface renewal in Atmosphere Surface Layer Turbulence" (Insieme di parole chiave)