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DEVELOPMENT AND IMPROVEMENT OF TEMPORAL ALLOCATION FACTOR FILES
Citation:
Moody, T., J. Winkler, T. Wilson, AND S. Kersteter. DEVELOPMENT AND IMPROVEMENT OF TEMPORAL ALLOCATION FACTOR FILES. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/R-95/004 (NTIS PB95-166153), 1995.
Impact/Purpose:
information
Description:
The report gives results of a project to: (1) evaluate the quality and completeness of data and methods being used for temporal allocation of emissions data, (2) identify and prioritize needed improvements to current methods for developing temporal allocation factors (TAFs), and (3) collect data to improve existing TAF files. The project focused on improving profiles for stationary point sources. Well-documented, national default allocation profiles were developed. The availability of an improved TAF file does not eliminate the need to collect actual data for temporally resolved emissions when these data are needed for an emissions inventory. The TAF file provides an improved database of default values that should be used when actual data can not be collected. (NOTE: Traditional emissions inventories produce annual or daily emissions estimates. For photochemical models, hourly emissions estimates are required. Ideally, hourly emissions would be measured directly; however, this approach is usually impractical due to technical and resource constraints. Alternatively, hourly emissions are estimated using surrogate factors from "temporal profiles" assigned to emissions source categories. This approach has been followed in previous studies.)