ESTS0212 MASCON.

1. NAME OR DESIGNATION OF PROGRAM:  MASCON.

3. DESCRIPTION OF PROGRAM OR FUNCTION

MASCON is a mass-consistent atmospheric flux model that processes observed inversion height and  wind data into two-dimensional, mass-consistent, zone-to-zone transfer coefficients. Both advective and diffusive processes are taken into account. The coefficients are valid overs specified time  periods for use by air-quality models. MASCON also calculates other  quantities required by LIRAQ, optionally performs graphic analysis of input and derived meteorological fields, and collects sets of mass flux data useful for evaluating the effects of the mass balance adjustments.

4. METHOD OF SOLUTION

MASCON uses a Gaussian weighting scheme to spatially interpolate observed meteorological data to a grid network. A variational functional of the continuity equation is minimized using the method of successive over-relaxation (SOR), along with Carre's algorithm for selection of an optimal relaxation  factor.

5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

Vertical fluxes are  assumed to be zero prior to the mass-consistent adjustment.

6. TYPICAL RUNNING TIME:

7. UNUSUAL FEATURES OF THE PROGRAM:

8. RELATED AND AUXILIARY PROGRAMS

MASCON was designed as a submodel for the Livermore Regional Air Quality models (LIRAQ) to produce two-dimensional mass-transfer flux coefficients, vertical eddy diffusion coefficients, inversion heights, and transmissivity data.

10. REFERENCES

- MASCON, NESC No. 9586, MASCON Tape Description,
  National Energy Software Center Note 87-75 (June 5, 1987).
- Marvin H. Dickerson,
MASCON - A Mass Consistent Atmospheric Flux Model for Regions with    Complex Terrain
  Journal of Applied Meteorology, Vol. 17, No. 3, pp. 244-253,
  March 1978 (also available as UCRL-76157 Rev. 3 Preprint,
  September 1977).
- M.C. MacCracken,
  User's Guide to the LIRAQ Model: An Air Pollution Model for the
  San Francisco Bay Area,
  UCRL-51983 (December 1975).

- T.W. Stullich, M.C. MacCracken and K.E. Grant:
  User's Guide to the MASCON Model: A Mass-Consistent Atmospheric
  Flux Submodel to Liraq
  UCRL-52400 (September 30, 1978).

11. MACHINE REQUIREMENTS:

13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED:  VM/CMS.

14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS:

15. NAME AND ESTABLISHMENT OF AUTHORS

Stullich, T.W.
Lawrence Livermore National Lab., CA (United States)

source program   mag tapeMASCON4 FORTRAN MASCON FORTRAN Source      SRCTP
source program   mag tapeMASCOMM COPY Common Blocks Include File    SRCTP
source program   mag tapePARMDATA COPY Parameter Data Include File  SRCTP
test-case data   mag tapeQMRUN DATA Basic Problem Specification     DATTP
test-case data   mag tapeZO DATA Surface Roughness Spatial distribu.DATTP
test-case data   mag tapeQMET DATA Meteorological Data              DATTP
test-case data   mag tapeQGEO DATA Topographical & Geographic Data  DATTP
test-case data   mag tapeQTRAN DATA Transfer Coefficients for LIRAQ DATTP
test-case output mag tapeQHSP DATA Sample Problem Output            OUTTP
report                   UCRL-52400 (September 30, 1978)            REPPT