Release Level	5.4
	Release Date	2008 10
	Revision Level	1.0

Last modified on:   Friday, 1-Jan-10 16:22 CET

Multi-PUFF model       PUFF scenarios       Mobil sources       Meteorological scenarios

Gaussian Puff Model

The Gaussian Puff Model in AirWare is derived from the USEPA model INPUFF 2.4 (Petersen and Lavadas, 1986).

INPUFF is a Gaussian INtegrated PUFF model. It is designed to simulate dispersion from semi-instantaneous or continuous and optionally mobile point sources over a spatially and temporally variable wind field (provided by prognostic meteorological models such as MM5 or WRF, or diagnostically interpolated wind fields). The algorithm is based on a Lagrangian transport framework for a sequence of emission events which disperse with Gaussian puff assumptions including a vertically uniform wind direction field and no chemical reactions.

The analytical solutions for atmospheric concentration of a gaseous or suspended particulate pollutant, incorporating dry deposition and gravitational settling were given by Rao (1982).

PUFF is implemented for:

• Basic scenario analysis, for a given domain, start date and durationo with the wind field and meteorological data provided either
  • by the data base of historical (re-analysis, FNL) prognostic model results;
  • daily (continuous, GFS) prognostic meteorological forecasts;
• Daily forecasts and now-casts;
• Scenario analysis for individual moving sources linked to the mobile source object data base.