Statistical analysis of primary and secondary atmospheric formaldehyde

Stephen Friedfeld, Matthew Fraser, Kathy Ensor, Seth Tribble, Dirk Rehle, Darrin Leleux, Frank Tittel

Research output: Contribution to journalArticle

61 Citations (Scopus)

Abstract

Regression models coupled with time series data were used to analyze the contribution of primary and secondary sources to formaldehyde (HCHO) concentrations, as determined by statistical analogy to primary (carbon monoxide, CO) and secondary (ozone, O3) compounds measured simultaneously in Houston, TX. Time series analyses substantiated the need for statistical methods of analysis, given the complexity of the data and the rapid fluctuations that occur in atmospheric concentrations. A positive relationship was found for both the auto-correlation function (ACF) and partial auto-correlation function (PACF) of HCHO with either CO or O3. Regression models used to distinguish primary and secondary contributions included a simple linear regression of the three compounds (one lag unit of time, 5min) on current HCHO concentrations, resulting in a ratio of secondary formation to primary emission of 1.7. A second, more robust model utilized auto-correlated error processes to approximate the true nature of the linear regression; this model also indicates the ratio of secondary to primary contribution at 1.7 as the mean of ten model simulations. From the error processes model, one lag unit of time was most significant for CO predicting HCHO, while simultaneous measurements (lag 0) were most significant for O3 predicting HCHO. Outlying O3 and HCHO concentrations were shown not to affect the results.

Original languageEnglish (US)
Pages (from-to)4767-4775
Number of pages9
JournalAtmospheric Environment
Volume36
Issue number30
DOIs
StatePublished - Oct 2002
Externally publishedYes

Fingerprint

formaldehyde
Formaldehyde
Statistical methods
statistical analysis
Autocorrelation
Linear regression
autocorrelation
Time series
time series
carbon monoxide
Carbon monoxide
Ozone
ozone
simulation

Keywords

  • Formaldehyde
  • Houston
  • Secondary formation
  • Statistical modeling
  • TX

ASJC Scopus subject areas

  • Atmospheric Science
  • Environmental Science(all)
  • Pollution

Cite this

Friedfeld, S., Fraser, M., Ensor, K., Tribble, S., Rehle, D., Leleux, D., & Tittel, F. (2002). Statistical analysis of primary and secondary atmospheric formaldehyde. Atmospheric Environment, 36(30), 4767-4775. https://doi.org/10.1016/S1352-2310(02)00558-7

Statistical analysis of primary and secondary atmospheric formaldehyde. / Friedfeld, Stephen; Fraser, Matthew; Ensor, Kathy; Tribble, Seth; Rehle, Dirk; Leleux, Darrin; Tittel, Frank.

In: Atmospheric Environment, Vol. 36, No. 30, 10.2002, p. 4767-4775.

Research output: Contribution to journalArticle

Friedfeld, S, Fraser, M, Ensor, K, Tribble, S, Rehle, D, Leleux, D & Tittel, F 2002, 'Statistical analysis of primary and secondary atmospheric formaldehyde', Atmospheric Environment, vol. 36, no. 30, pp. 4767-4775. https://doi.org/10.1016/S1352-2310(02)00558-7
Friedfeld, Stephen ; Fraser, Matthew ; Ensor, Kathy ; Tribble, Seth ; Rehle, Dirk ; Leleux, Darrin ; Tittel, Frank. / Statistical analysis of primary and secondary atmospheric formaldehyde. In: Atmospheric Environment. 2002 ; Vol. 36, No. 30. pp. 4767-4775.
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