HR: 10:55h
AN: A22B-04 INVITED    [Abstracts]
TI: Scaling laws of atmospheric macroturbulence and their implications for Hadley cell dynamics and climate stability
AU: * Schneider, T
EM: tapio@gps.caltech.edu
AF: California Institute of Technology, 1200 E. California Blvd, Pasadena, CA 91125-2300, United States
AB: In simulations of a wide range of circulations with an idealized general circulation model, clear scaling laws of dry atmospheric macroturbulence emerge. The scaling laws exhibit a regime transition, between a regime in which the extratropical thermal stratification and tropopause height are controlled by radiation and convection and a regime in which baroclinic entropy fluxes modify the extratropical thermal stratification and tropopause height. At the regime transition, for example, the dependence of the eddy flux of surface potential temperature and the dependence of the vertically integrated eddy momentum flux convergence on mean fields changes. This result has implications for climate stability and for the general circulation of an atmosphere, including its Hadley circulation, which is strongly influenced by eddy momentum fluxes and exhibits a similar regime transition.
UR: http://www.gps.caltech.edu/~tapio/pubs.html
DE: 1610 Atmosphere (0315, 0325)
DE: 1620 Climate dynamics (0429, 3309)
SC: Atmospheric Sciences [A]
MN: 2007 Fall Meeting