Emissions Modeling Clearinghouse
Another step of modeling inventory development is the temporal allocation of emissions. Because air quality modeling attempts to represent the actual physical and chemical processes as they occur over a specific duration of time, it is important that the temporal allocation of emissions be as accurate as possible. Temporal allocation can be thought of as an accounting of emissions variation over time. The simplest temporal allocation is for a steady-state emissions source that continually releases emissions at the same rate all the time. Under actual conditions, however, steady-state emission sources are quite rare. Instead, under actual conditions, emissions sources may operate only in the winter, not operate on Sundays, or their activity may peak during certain hours of the day. Temporal allocations allow emissions variability to be correctly modeled during the desired modeling periods. The desired modeling periods will vary depending upon the purpose of the inventory.
|Related Temporal Allocation Files|
|Temporal Profile Usage Memorandum
This document outlines the usage of each of the temporal allocation files to estimate hourly from annual emissions.
|CAIR Platform Data|
|Temporal SMOKE CAIR Platform Data - SMOKE Format February 2005||(ZIP 248K)|
|Temporal Cross Reference File for CAIR Platform - MS Excel February 2005
|Temporal Profile - CAIR Platform - MS Excel February 2005
|Pre CAIR Data|
|Source Category Code / Temporal Allocation Cross Reference File (4/29/2002)
This file provides SCC to monthly, weekly, and diurnal temporal allocation profile matches.
|Monthly Profile File (4/29/2002)
This file provides the monthly profile code and associated monthly weighting factors.
|Weekly Profile File(12/14/2000)
This file provides the weekly profile code and associated day-of-week weighting factors.
|Diurnal Profile File
This file provides the diurnal profile code and associated hour-of-day weighting factors.