Compositional receptor modeling

Research output: Contribution to journalArticlepeer-review

51 Scopus citations

Abstract

Receptor models apportion an ambient mixture of pollutants to the contributing pollution sources. Often, neither the number of sources nor their chemical profiles are known precisely. The dual goals of modeling are to estimate the chemical 'signature' of the sources, and to characterize the mixing process. The author develops a novel modeling approach for receptor data where all model components are compositions (i.e. vectors of proportions). This approach maintains positivity and summation constraints for source contributions and chemical profiles. Further, it incorporates available prior knowledge regarding the source chemical profiles. Including prior knowledge allows parameter estimation while avoiding restrictive assumptions regarding presence or absence of chemical tracers. This approach is illustrated by modeling air pollution data collected from a receptor near Juneau, Alaska. The compositional model produces point estimates of source profiles and mixing proportions similar to those obtained in a previous study. However, interval estimates for mixing proportions are roughly 30 per cent shorter than those found previously.

Original languageEnglish (US)
Pages (from-to)451-467
Number of pages17
JournalEnvironmetrics
Volume12
Issue number5
DOIs
StatePublished - Aug 21 2001
Externally publishedYes

Keywords

  • Air pollution
  • Compositional data
  • Convex mixture
  • Receptor model
  • Source apportionment

ASJC Scopus subject areas

  • Statistics and Probability
  • Ecological Modeling

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