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Global spectra of energy and enstrophy and their fluxes during July 1979

Desai, SS and Mishra, SK (1993) Global spectra of energy and enstrophy and their fluxes during July 1979. Proceedings of the Indian Academy of Sciences - Earth and Planetary Sciences, 102 (2). pp. 329-350.

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Abstract

Transient and stationary spectra of kinetic energy (KE), available potential energy (APE) and enstrophy (EN), and their spectral fluxes as a function of the two-dimensional wavenumbern were computed for July 1979. Triangular truncation at zonal wavenumber 42 was used for computation. The slopes of various spectra in the wavenumber range 14≤n≤25 were obtained by fitting a straight line in log-log scale by the least square method. The transientKE, APE andEN spectra in the lower (upper) troposphere had slopes −2·21 (−2·30), −2·65 (−2·64) and −0·36 (−0·46), respectively. The effect of stationary and divergent motion on the slope values was investigated. The possible correlation between the slope and percentage of transient component in the combined energy and enstrophy was examined to identify the transient motion of the atmosphere with the two-dimensional homogeneous isotropic turbulence. The vertically averaged slope of kinetic energy and enstrophy in the lower (upper) troposphere was close to the value at 700 (200) hPa level

Item Type: Article
Additional Information: Copyright of this article belongs to Indian academy of Science
Uncontrolled Keywords: energy; enstrophy; global spectra; spectral flux
Subjects: Meteorology and Climatology
Depositing User: IITM Library
Date Deposited: 02 Jun 2015 09:37
Last Modified: 02 Jun 2015 09:37
URI: http://moeseprints.incois.gov.in/id/eprint/1068

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