Large-scale self-organization in dry turbulent atmospheres

• 成果类型: Article
• 署名作者: Alexakis, Alexandros; Marino, Raffaele; Mininni, Pablo D.; van Kan, Adrian; Foldes, Raffaello; Feraco, Fabio
• 署名单位: Universite Paris Cite; Sorbonne Universite; Centre National de la Recherche Scientifique (CNRS); Universite PSL; Ecole Normale Superieure (ENS); Centre National de la Recherche Scientifique (CNRS); Ecole Centrale de Lyon; Institut National des Sciences Appliquees de Lyon - INSA Lyon; Universite Claude Bernard Lyon 1; Universite Jean Monnet; University of Buenos Aires; Consejo Nacional de Investigaciones Cientificas y Tecnicas (CONICET); University of Buenos Aires; University of California System; University of California Berkeley; Leibniz Association; Leibniz Institut fur Atmospharenphysik e.V. an der Universitat Rostock (IAP); University of Rostock
• 刊物名称: SCIENCE
• ISSN/ISSBN: 0036-11010
• DOI: 10.1126/science.adg8269
• 发表日期: 2024-03-01
• 页码: 1005-1009
• 关键词: velocity structure functions; kinetic-energy spectra; upper troposphere; aircraft; waves

摘要

How turbulent convective fluctuations organize to form larger-scale structures in planetary atmospheres remains a question that eludes quantitative answers. The assumption that this process is the result of an inverse cascade was suggested half a century ago in two-dimensional fluids, but its applicability to atmospheric and oceanic flows remains heavily debated, hampering our understanding of the energy balance in planetary systems. We show using direct numerical simulations with spatial resolutions of 122882 x 384 points that rotating and stratified flows can support a bidirectional cascade of energy, in three dimensions, with a ratio of Rossby to Froude numbers comparable to that of Earth's atmosphere. Our results establish that, in dry atmospheres, spontaneous order can arise through an inverse cascade to the largest spatial scales.