Sensitivity of simulated mesoscale atmospheric circulations resulting from landscape heterogeneity to aspects of model configuration

Christopher P. Weaver, Somnath Baidya Roy, Roni Avissar

Research output: Contribution to journalArticlepeer-review

Abstract

Recent work has demonstrated the importance of anthropogenic landscape heterogeneity in Amazonia and the central U.S. in forcing mesoscale atmospheric circulations and generating clouds and precipitation. It has been shown that failing to account for this surface heterogeneity may have important implications for the simulation of land-atmosphere interactions in large-scale atmospheric models. The work presented here shows that, in addition to correctly specifying the surface forcing, accurate simulation of landscape-induced mesoscale effects with a regional model (e.g., Regional Atmospheric Modeling System, RAMS) depends critically on informed choices of aspects of model configuration. These include horizontal resolution, strength of nudging, and atmospheric initialization. Sensitivity experiments designed to illustrate the impact of varying these factors on RAMS-simulated, landscape-induced mesoscale circulations are presented here. These results, supported by dynamical and scaling arguments, suggest that model configuration can have at least as great an impact on the simulated mesoscale circulations, fluxes, and PBL structure as correctly accounting for mesoscale landscape heterogeneity. Such experiments therefore provide crucial guidance for optimally constructing simulations of mesoscale land-atmosphere interaction important for a variety of applications from field campaigns to parameterization development.

Original languageEnglish (US)
Pages (from-to)XLXXXV-XLXXXVI
JournalJournal of Geophysical Research D: Atmospheres
Volume107
Issue number20
StatePublished - 2002
Externally publishedYes

Keywords

  • 3307 Meteorology and Atmospheric Dynamics: Boundary layer processes
  • 3322 Meteorology and Atmospheric Dynamics: Land/atmosphere interactions
  • 3337 Meteorology and Atmospheric Dynamics: Numerical modeling and data assimilation

ASJC Scopus subject areas

  • Geophysics
  • Forestry
  • Oceanography
  • Aquatic Science
  • Ecology
  • Water Science and Technology
  • Soil Science
  • Geochemistry and Petrology
  • Earth-Surface Processes
  • Atmospheric Science
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science
  • Palaeontology

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