Convective transport over the central United States and its role in regional CO and ozone budgets

A. M. Thompson

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Abstract

We have constructed a regional budget for boundary layer carbon monoxide over the central United states, emphasizing a detailed evaluation of deep convective vertical fluxes appropriate for the month of June. Calcualtions of deep convective venting are based on the method of Pickering et al. [1992a] which uses a satellite-derived deep convective cloud climatology along with transport statistics from convective cloud model simulations of observed prototype squall line events. Deep convective venting of the boundary layer over this moderately polluted region provides a net (upward minus downward) flux of 18.1 × 108 kg CO month -1 to the free troposphere during early summer. Shallow cumulus and synoptic-scale weather systems together make a comparable contribution (total net flux 16.2 × 108 kg CO month-1). Boundary layer venting of CO with other O3 precursors leads to efficient free tropospheric O3 formation. We estimate that deep convective transport of CO and other precursors over the central United States in early summer leads to a gross production of 0.66-1.1 Gmol O3 d-1 in good agreement with estimates of O3 production from boundary layer venting in a continental-scale model [Jacob et al. 1993a, b]. -from Authors

Original languageEnglish (US)
Pages (from-to)18,703-18,711
JournalJournal of Geophysical Research
Volume99
Issue numberD9
Publication statusPublished - Jan 1 1994

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All Science Journal Classification (ASJC) codes

  • 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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