Article Dans Une Revue Frontiers in Earth Science Année : 2024

Recent progress in atmospheric modeling over the Andes – part I: review of atmospheric processes

D. Bozkurt
  • Fonction : Auteur
M. Viale
  • Fonction : Auteur
K. Trachte
  • Fonction : Auteur
L. Campozano
  • Fonction : Auteur
J. Boisier
  • Fonction : Auteur
J. Pabón-Caicedo
  • Fonction : Auteur
A. Sörensson
  • Fonction : Auteur

Résumé

The Andes is the longest mountain range in the world, stretching from tropical South America to austral Patagonia (12°N-55°S). Along with the climate differences associated with latitude, the Andean region also features contrasting slopes and elevations, reaching altitudes of more than 4,000 m. a.s.l., in a relatively narrow crosswise section, and hosts diverse ecosystems and human settlements. This complex landscape poses a great challenge to weather and climate simulations. The interaction of the topography with the large-scale atmospheric motions controls meteorological phenomena at scales of a few kilometers, often inadequately represented in global (grid spacing ∼200–50 km) and regional (∼50–25 km) climate simulations previously studied for the Andes. These simulations typically exhibit large biases in precipitation, wind and near-surface temperature over the Andes, and they are not suited to represent strong gradients associated with the regional processes. In recent years (∼2010–2024), a number of modeling studies, including convection permitting simulations, have contributed to our understanding of the characteristics and distribution of a variety of systems and processes along the Andes, including orographic precipitation, precipitation hotspots, mountain circulations, gravity waves, among others. This is Part I of a two-part review about atmospheric modeling over the Andes. In Part I we review the current strengths and limitations of numerical modeling in simulating key atmospheric-orographic processes for the weather and climate of the Andean region, including low-level jets, downslope winds, gravity waves, and orographic precipitation, among others. In Part II, we review how climate models simulate surface-atmosphere interactions and hydroclimate processes in the Andes Cordillera to offer information on projections for land-cover/land-use change or climate change. With a focus on the hydroclimate, we also address some of the main challenges in numerical modeling for the region.

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hal-04927725 , version 1 (21-03-2025)

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J. Martinez, Clementine Junquas, D. Bozkurt, M. Viale, L. Fita, et al.. Recent progress in atmospheric modeling over the Andes – part I: review of atmospheric processes. Frontiers in Earth Science, 2024, 12, ⟨10.3389/feart.2024.1427783⟩. ⟨hal-04927725⟩
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