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- Title
South Atlantic Convergence Zone as Rossby wave source.
- Authors
Braga, Hugo A.; Ambrizzi, Tercio; Hall, Nicholas M. J.
- Abstract
We investigate the possibility for the South Atlantic Convergence Zone (SACZ) to act as a Rossby wave source for global scale teleconnections. A simple heating perturbation is applied to numerical simulations using a baroclinic model with differing basic states. Sixteen days after the perturbation is applied, wave propagation is diagnosed within the subtropical latitudes of the Northern Hemisphere for the basic states corresponding to El Niño and neutral years, which have normal and strong westerly flow in the upper troposphere over the Equatorial Atlantic Ocean. For La Niña basic states, there is very little propagation over the Equatorial Atlantic Ocean because the westerly flow is weak, confining Rossby waves to the Southern Hemisphere. We conclude that the SACZ may act as interhemispheric Rossby wave source, providing the tropical westerly flow is strong enough to permit wave propagation across the Equatorial Atlantic Ocean.
- Subjects
ROSSBY waves; EL Nino; BAROCLINIC models; THEORY of wave motion; LA Nina; TROPOSPHERE; TELECONNECTIONS (Climatology); SOUTHERN oscillation
- Publication
Theoretical & Applied Climatology, 2024, Vol 155, Issue 5, p4231
- ISSN
0177-798X
- Publication type
Article
- DOI
10.1007/s00704-024-04877-y