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<p>Atmospheric turbulence organizes into coherent structures, entities that contribute significantly to turbulent transport of properties. We analyzed micrometeorological data measured in Santa Maria, RS, Brazil, into the Pampa biome, in southern South America. This experiment provided a unique dataset of over a year in a region with high summer/winter temperature contrast, that enabled the characterization of turbulent transport across a wide range of atmospheric stability. Atmospheric stability strongly influences turbulent transport. Coherent structures like “hairpin vortices” develop better in neutral situations due to strong wind shear. They transport momentum more efficiently, exhibiting equal proportions of ejection/sweep motions in both magnitude and duration. “Thermal plumes” are responsible for highly efficient scalar turbulent transport (temperature, humidity and <InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="10546_2025_940_Article_IEq1.gif" Format="GIF" Height="16" Rendition="HTML" Resolution="72" Type="Linedraw" Width="32" /> </InlineMediaObject> <EquationSource Format="TEX">\(\hbox {CO}_2\)</EquationSource> </InlineEquation>), during summer strong-unstable situations. With them, ejections prevail in magnitude, but sweeps are long-lasting. During the night, strongly stable conditions develop, with intermittent and patchy turbulence that does not organize. Turbulent transport results less effective compared with weaker stable situations. The turbulent transport for the different scalars becomes more dissimilar. A dissimilar behavior in vertical turbulent transport of humidity, temperature and <InlineEquation ID="IEq2"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="10546_2025_940_Article_IEq1.gif" Format="GIF" Height="16" Rendition="HTML" Resolution="72" Type="Linedraw" Width="32" /> </InlineMediaObject> <EquationSource Format="TEX">\(\hbox {CO}_2\)</EquationSource> </InlineEquation> was observed, especially in stable conditions.</p>

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Turbulent Transport by Coherent Structures in the Brazilian Pampa Region

  • 期刊论文

  • 发表日期：

    2025年10月3日

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  • Lucia Curto,
  • Michel Stefanello,
  • Debora Roberti,
  • María I. Gassmann,
  • Otávio C. Acevedo

摘要

Atmospheric turbulence organizes into coherent structures, entities that contribute significantly to turbulent transport of properties. We analyzed micrometeorological data measured in Santa Maria, RS, Brazil, into the Pampa biome, in southern South America. This experiment provided a unique dataset of over a year in a region with high summer/winter temperature contrast, that enabled the characterization of turbulent transport across a wide range of atmospheric stability. Atmospheric stability strongly influences turbulent transport. Coherent structures like “hairpin vortices” develop better in neutral situations due to strong wind shear. They transport momentum more efficiently, exhibiting equal proportions of ejection/sweep motions in both magnitude and duration. “Thermal plumes” are responsible for highly efficient scalar turbulent transport (temperature, humidity and \(\hbox {CO}_2\) ), during summer strong-unstable situations. With them, ejections prevail in magnitude, but sweeps are long-lasting. During the night, strongly stable conditions develop, with intermittent and patchy turbulence that does not organize. Turbulent transport results less effective compared with weaker stable situations. The turbulent transport for the different scalars becomes more dissimilar. A dissimilar behavior in vertical turbulent transport of humidity, temperature and \(\hbox {CO}_2\) was observed, especially in stable conditions.