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A wind-albedo-wind feedback driven by landscape evolution.

Jordan T Abell1,2, Alex Pullen3, Zachary J Lebo4

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Near-surface wind patterns are crucial for climate understanding. Landscape changes in deserts can paradoxically increase wind speeds by up to 25%, impacting dust emission potential.

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Area of Science:

  • Climate Science
  • Atmospheric Science
  • Geomorphology

Background:

  • Accurate characterization of near-surface winds is critical for understanding past and modern climate.
  • Dust lofted by winds significantly influences surface, atmospheric, and ocean conditions.
  • Stony deserts, currently low dust emitters, are sensitive to geological changes impacting near-surface conditions.

Purpose of the Study:

  • To investigate the relationship between wind-driven landscape evolution and atmospheric boundary layer conditions.
  • To demonstrate a previously undocumented feedback mechanism in desert environments.
  • To quantify the impact of altered surficial geology on near-surface wind speeds.

Main Methods:

  • Utilized the Weather Research and Forecasting (WRF) model for simulations.
  • Focused analysis on the western Gobi Desert region.
  • Examined changes in surficial thermal properties and albedo due to sediment winnowing and gravel mantle formation.

Main Results:

  • Altered surficial thermal properties led to an increase in near-surface winds by up to 25%.
  • Demonstrated a paradoxical effect where wind erosion results in regionally faster winds.
  • Observed an increased frequency of high wind speed hours, suggesting heightened dust emission potential.

Conclusions:

  • A novel wind-albedo-wind feedback mechanism was identified.
  • Landscape evolution in stony deserts can significantly amplify near-surface wind speeds.
  • These findings have critical implications for understanding dust emission dynamics and climate feedbacks.