Clear Air Turbulence as a Response to Meso- and Synoptic-Scale Dynamic Processes

Autor:	John L. Keller
Rok vydání:	1990
Předmět:	Atmospheric Science Isentropic analysis Richardson number Scale (ratio) Synoptic scale meteorology Mesoscale meteorology Mechanics Dissipation Atmospheric sciences Clear-air turbulence Geology Bulk Richardson number
Zdroj:	Monthly Weather Review. 118:2228-2243
ISSN:	1520-0493 0027-0644
DOI:	10.1175/1520-0493(1990)118<2228:cataar>2.0.co;2
Popis:	The paper presents both the Roach equation for the rate of energy dissipation due to clear air turbulence and Richardson number tendencies in isentropic coordinates and examines the implications of these formulations to determine whether there is a dynamic interdependence between Ri and the nonturbulent deformation processes. The equation representing the ln(Ri) tendency is applied diagnostically to grids from an isentropic analysis of archived soundings. The evolution of the Richardson number fields over 12-hour time periods is examined using a mechanistic model. It is suggested that the application of the Roach equation for the turbulent dissipation rate should have a more restricted use. Analyses of the meso-alpha scale Richardson number and of the Richardson number tendency fields reveal a phase relationship consistent with the theoretical predictions.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::a00352df60357368bc876031a52a09d1 https://doi.org/10.1175/1520-0493(1990)118<2228:cataar>2.0.co Zobrazit plný text záznamu