MESOPUFF II cannot simulate seasonal or annual time scales in a single model run,

especially on a PC. One problem we had identified during review of the SCRAM BBS

example problem at the start of the project was the demand put upon PC disk storage by

MESOPAC and MESOPUFF II input/output (I/O). We had anticipated executing

MESOPAC and MESOPUFF II in one-month intervals, using the MESOPUFF II restart

option for all but the first month of each year. One month of MESOPAC output for the 50 by

35 grid point domain produced 50-55 megabytes of output. This is a manageable amount for

the 200 MB PC hard drive systems we used; other potential users of the meteorological data

are likely to have similar systems. Monthly MESOPUFF II output was significantly less

(about 1 MB).

During the demonstration applications, we found that a single MESOPUFF II integration over

several months would have also stressed MESOPUFF II memory requirements. This is

related to simplistic puff accounting within MESOPUFF II, which continuously adds new

puffs as they are emitted, yet does not purge old puffs that exit the computational grid.

Particularly during stagnant conditions, the number of puffs quickly grows to the maximum

dimension of the puff array, which slows MESOPUFF II considerably. This problem is

discussed further in following sections.

DEVELOPMENT OF METEOROLOGICAL INPUTS

MESOPAC requires the following input meteorological data: (1) twice daily upper air

temperature and wind soundings in NCDC TD-6200 format at up to 20 radiosonde stations;

(2) scheduled airways surface observations in NCDC CD144 format, which include hourly

winds, temperature, relative humidity, cloud cover and ceiling height at up to 100 stations;

and (3) hourly precipitation data in NCDC TD-3240 format. The CD144 data sets are input

directly into MESOPAC, whereas the upper air and precipitation data must be scanned for

missing data and reformatted using several MESOPAC preprocessors. MESOPAC and its

preprocessors expect the data in these specific NCDC formats.

Prior to the start of this project, SAI already possessed in-house upper air and hourly surface

data for 1988 covering the entire U.S. However, we had to procure precipitation data for

1988-1992, and upper air and surface data for 1989-1992. At the time, we anticipated that

some of the data sets we were to acquire would not necessarily fit the MESOPAC formats,

and either the data would have to be reformatted for the processors, or the processors would

have to be revised. Furthermore, the protocol called for the development of a procedure to fill

in missing data in the upper-air soundings. We recognized that for a 5-year database, it would

not be feasible to fill in missing data by hand. Consequently, we needed to develop a

processor that uses a specified set of rules to automatically fill in missing data. Based upon

the size of the proposed meteorological domain (see Figure 3-1), it was also expected that the

MESOPAC limits on the number of surface and upper air sites would probably need to be

increased.

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