in the past. Also, there may be ways of dealing with potential problems posed by using larger
than desired grid cells. For example, use of plume-in-grid algorithms for large point sources of
NOx should be considered as an alternative with coarser than desired grid cells. And dispersion
modeling of primary PM can be used to offset the need of fine spatial resolution in a grid model.
The relative importance of using a domain with grid cells as small as 4 km should be
weighed on a case by case basis by those implementing the modeling/analysis protocol. The
most important factor to consider is model response to emissions controls. Analysis of ambient
data, sensitivity modeling, and past modeling results can be used to evaluate the expected
response to emissions controls at various horizontal resolutions for both ozone and PM2.5. If
model response is expected to be different (and more accurate) at higher resolution, then higher
resolution modeling should be considered. If model response is expected to be similar at both
high and lowe(er) resolution, then high resolution modeling may not be necessary.
In this guidance, we identify upper limits for horizontal grid cell size which may be
larger than desired for some applications. This is intended to provide flexibility for considering
competing factors (e.g., number of modeled days versus grid cell size) in performing a modeling
analysis within the limits of time and resources.
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castellano: DISPER CUSTIC DESCAR RADIA italiano:
deutsch: DIS CUS DES RAD
castellano: DIS CUS DES RAD english: DIS CUS DES RAD
português: DIS CUS DES RAD italiano: DIS CUS DES RAD
français: DIS CUS DES RAD