United States Atmospheric Sciences Research
Environmental Protection Laboratory
Agency Research Triangle Park NC 27711
Research and Development EPA/600/S8-86/027 Dec. 1986
SEPA Project Summary
Addendum to TUPOS—
Incorporation of a Hesitant
Plume Algorithm
D. Bruce Turner
This Project Summary was devel-
oped by EPA's Atmospheric Sciences
Research Laboratory. Research Tri-
angle Park, NC, to announce key
findings of the research project that is
fully documented in a separate report
of the same title (see Project Report
ordering information at back).
The existence of non-Gaussian plume
behavior within the convective boundary
layer has been pointed out and recently
discussed at a national conference. In
such cases the buoyant forces within the
plume, although unable to penetrate the
inversion, both resist downward motion
and result in increased horizontal
spreading. Because of its hesitancy for
downwind dispersion, the author is using
"hesitant plume" to refer to the above
plume behavior. Briggs has suggested
convective scaling parameterizations for
surface crosswind integrated concentra-
tions. Combined with parameterization of
the crosswind spreading and assuming
that the horizontal diffusion is Gaussian,
allows estimation of concentrations on
the horizontal plane. This addendum
makes changes to the TUPOS model
(Turner et al., 1986) in order to better
account for buoyant plumes that bump
against, but do not penetrate, the inver-
sion layer at the mixing height. The
resulting algorithm isTUPOS-2.0.
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The EPA author, Bruce Turner (also the EPA Project Officer, see below) is with
Atmospheric Sciences Research Laboratory, Research Triangle Park, NC
27711.
The complete report, entitled "Addendum to TUPOS—Incorporation of a Hesitant
Plume Algorithm," (Order No. PB 86-241 031/AS; Cost: $9.95. subject to
change) will be available only from:
National Technical Information Service
5285 Port Royal Road
Springfield, VA 22161
Telephone: 703-487-4650
The EPA Project Officer can be contacted at:
Atmospheric Sciences Research Laboratory
U.S. Environmental Protection Agency
Research Triangle Park. NC 27711
United States
Environmental Protection
Agency
Center for Environmental Research
Information
Cincinnati OH 45268
Official Business
Penalty for Private Use $300
EPA/600/S8-86/027
0000329 PS
60604
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