Sensitivity of summer climate to anthropogenic land-cover change over the Greater Phoenix, AZ, region

M. Georgescu, G. Miguez-Macho, L. T. Steyaert, C. P. Weaver

Research output: Contribution to journalArticle

11 Scopus citations

Abstract

This work evaluates the first-order effect of land-use/land-cover change (LULCC) on the summer climate of one of the nation's most rapidly expanding metropolitan complexes, the Greater Phoenix, AZ, region. High-resolution-2-km grid spacing-Regional Atmospheric Modeling System (RAMS) simulations of three "wet" and three "dry" summers were carried out for two different land-cover reconstructions for the region: a circa 1992 representation based on satellite observations, and a hypothetical land-cover scenario where the anthropogenic landscape of irrigated agriculture and urban pixels was replaced with current semi-natural vegetation. Model output is evaluated with respect to observed air temperature, dew point, and precipitation. Our results suggest that development of extensive irrigated agriculture adjacent to the urban area has dampened any regional-mean warming due to urbanization. Consistent with previous observationally based work, LULCC produces a systematic increase in precipitation to the north and east of the city, though only under dry conditions. This is due to a change in background atmospheric stability resulting from the advection of both warmth from the urban core and moisture from the irrigated area.

Original languageEnglish (US)
Pages (from-to)1358-1373
Number of pages16
JournalJournal of Arid Environments
Volume72
Issue number7
DOIs
StatePublished - Jul 1 2008
Externally publishedYes

Keywords

  • Anthropogenic impact
  • Arizona
  • Land-atmosphere interactions
  • Land-use-land-cover change
  • Phoenix
  • Precipitation
  • Regional climate modeling

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Ecology
  • Earth-Surface Processes

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