Environmental Engineering Reference
In-Depth Information
30
25
20
P > 0.5
0<L<100
Sounding
Mast (8-2 m)
Mast (20-8 m)
15
10
5
0
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sept.
Oct.
Nov.
Dec.
Fig. 1.
Frequencies of stable meteorological conditions estimated by different methods
4. Conclusions
Although the statistics presented in
Fig. 1
are neither strictly comparable nor com-
prehensive, they constitute a rough proof that the developed method is applicable
in practice for diagnosing the night-time stagnating conditions in surface layer.
However, due to surface-based initial data and definition of NRI, this method is
in principle not able to predict neither elevated inversions nor relatively infrequent
daytime inversions.
Acknowledgments
Elaboration of the method was funded by AS Steiger. Investigation of
inversions based on radiosounding data was supported by Estonian Science Foundation, research
grants No 7005 and 7478.
References
Air4EU (2005)
Air Quality Assessment for Europe: from local to continental scale
. Report on
workshop 29th June 2005, Athens.
Cimorelli A. J., S. G. Perry A. Venkatram J. C. Weil R. J. Paine R. B. Wilson R. F. Lee W. D.
Peters and R. W. Brode (2005) AERMOD: A dispersion model for industrial source
applications Part I: General model formulation and boundary layer characterization.
J Appl
Meteor
, 44: 682-693.
Golder D. (1972) Relations among stability parameters in the surface layer.
Boundary Layer
Meteor.
, 3: 47-58.
Myrup, L.O., Ranzieri, A.J. (1976) A consistent scheme for estimating diffusivities to be used in
air quality models.
Caltrans
, FHWA-CA-TL-7169-76-32.
Stull, R.B. (1997)
An introduction to boundary layer meteorology
. Kluwer, 670.
