An anthropogenic signal in Phoenix, Arizona winter precipitation

Bohumil M. Svoma, Robert Balling

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Many other investigators have shown pronounced weekly cycles in atmospheric composition, particularly in large urban settings. A substantial body of literature shows that the varying concentrations of fine atmospheric aerosols (particulate matter (PM)2.5) impact precipitation processes; generally, higher concentrations of these aerosols tend to depress winter precipitation especially in short-lived, shallow, and orographic clouds. Phoenix, Arizona has a large population relying heavily on motor vehicles as the primary means of transportation. This results in a strong weekly cycle of PM2.5 concentrations with a maximum on Wednesday and Thursday and a distinctive minimum on the weekend. To determine any influence on rainfall, we analyze daily precipitation records from 291 stations in the Phoenix area and find a strong weekly cycle in winter precipitation frequencies with maximum values on Sunday and minimum values on Thursday. The weekly cycle in precipitation frequency strengthens slightly moving eastward (downwind) across the metropolitan area as well as with increasing proximity to the metropolitan area. These results strongly suggest that human activity is influencing winter precipitation primarily by the suppressing effect of PM2.5.

Original languageEnglish (US)
Pages (from-to)315-321
Number of pages7
JournalTheoretical and Applied Climatology
Volume98
Issue number3-4
DOIs
StatePublished - 2009

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metropolitan area
winter
aerosol
particulate matter
human activity
rainfall
effect
atmospheric composition
station
motor vehicle

ASJC Scopus subject areas

  • Atmospheric Science

Cite this

An anthropogenic signal in Phoenix, Arizona winter precipitation. / Svoma, Bohumil M.; Balling, Robert.

In: Theoretical and Applied Climatology, Vol. 98, No. 3-4, 2009, p. 315-321.

Research output: Contribution to journalArticle

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