Record Display for the EPA National Library Catalog


Main Title Spatial Variation of the Evolution and Structure of the Urban Boundary Layer.
Author Godowitch, J. M. ; Ching, J. K. S. ; Clarke, J. F. ;
CORP Author Environmental Protection Agency, Research Triangle Park, NC. Atmospheric Sciences Research Lab.
Year Published 1987
Report Number EPA/600/J-87/106;
Stock Number PB88-139670
Additional Subjects Boundary layer ; Temperature inversion ; Urban areas ; Mixing ; Heating ; Sites ; Temperature gradients ; Advection ; Cooling ; Atmospheric sounding ; Helicopters ; Missouri ; Reprints ; Saint Louis(Missouri) ; Atmospheric boundary layer ; Sunrise
Library Call Number Additional Info Location Last
NTIS  PB88-139670 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 26p
The spatial variation of the nocturnal urban boundary layer structure and the time variation of the mixing height, the nocturnal inversion top and strength after sunrise are presented for urban sites located upwind, downwind, and near the center of the heat island and for upwind nonurban sites. Observations were obtained from high resolution temperature soundings made by helicopter spirals during 35 morning experiments in St. Louis, Missouri. The mixing height (base of the nocturnal inversion) evolved in a parabolic manner after sunrise at the urban locations. A rise in the inversion top after sunrise at urban sites is believed to be due to low level convergence which caused the entire inversion layer to be lifted. Large horizontal temperature gradients are associated with the heat island effect at the surface.