Topography-induced locking of drifting Rossby-Haurwitz waves

Autor(es)

Ciro, D. ^[1] ; Raphaldini, B. ^[1] ; Raupp, C. F. M. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Inst Astron Geophys & Atmospher Sci, BR-05508090 Sao Paulo, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Physics of Fluids; v. 32, n. 4 APR 1 2020.
• Citações Web of Science: 0

Resumo

Atmospheric blockings are persistent large-scale climate patterns that lock in a geographic position for days and even weeks. In principle, blockings might involve a large number of waves interacting non-linearly, and a conclusive description for their onset and duration is still elusive. In this paper, we introduce a simplified account for this phenomenon by means of a single-triad of Rossby-Haurwitz waves perturbed by one topographic mode. It is shown that the dynamical features of persistent flow patterns have zero measure in the phase space for an unperturbed triad, but such a measure becomes finite for the perturbed dynamics. By this account, we suggest that static inhomogeneities in the two-dimensional atmospheric layer are required for locking the flow patterns to the planetary rotation. (AU)

• Processo FAPESP: 15/50686-1 - Paleo-vínculos na evolução das monções e dinâmica
• Beneficiário: Pedro Leite da Silva Dias
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 17/23417-5 - Variabilidade paleoclimática da Zona de Convergência do Atlântico Sul e processos no Oceano Atlântico e Pacífico: Último Glacial, Holoceno Médio e Último Milênio
• Beneficiário: Breno Raphaldini Ferreira da Silva
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado