Local Dynamics of Baroclinic Waves in the Martian Atmosphere

Michael J. Kavulich, Istvan Szunyogh, Gyorgyi Gyarmati, R. John Wilson

Research output: Contribution to journalArticlepeer-review

16 Scopus citations

Abstract

The paper investigates the processes that drive the spatiotemporal evolution of baroclinic transient waves in the Martian atmosphere by a simulation experiment with the Geophysical Fluid Dynamics Laboratory (GFDL) Mars general circulation model (GCM). The main diagnostic tool of the study is the (local) eddy kinetic energy equation. Results are shown for a prewinter season of the Northern Hemisphere, in which a deep baroclinic wave of zonal wavenumber 2 circles the planet at an eastward phase speed of about 70° Sol-1 (Sol is a Martian day). The regular structure of the wave gives the impression that the classical models of baroclinic instability, which describe the underlying process by a temporally unstable global wave (e.g., Eady model and Charney model), may have a direct relevance for the description of the Martian baroclinic waves. The results of the diagnostic calculations show, however, that while the Martian waves remain zonally global features at all times, there are large spatiotemporal changes in their amplitude. The most intense episodes of baroclinic energy conversion, which take place in the two great plain regions (Acidalia Planitia and Utopia Planitia), are strongly localized in both space and time. In addition, similar to the situation for terrestrial baroclinic waves, geopotential flux convergence plays an important role in the dynamics of the downstream-propagating unstable waves. © 2013 American Meteorological Society.
Original languageEnglish (US)
Pages (from-to)3415-3447
Number of pages33
JournalJournal of the Atmospheric Sciences
Volume70
Issue number11
DOIs
StatePublished - Nov 2013
Externally publishedYes

Fingerprint

Dive into the research topics of 'Local Dynamics of Baroclinic Waves in the Martian Atmosphere'. Together they form a unique fingerprint.

Cite this