Martian Atmosphere Breeding: Elucidating Atmospheric Instabilities and Moving Toward Reanalysis

Details Martian Atmosphere Breeding: Elucidating Atmospheric Instabilities and Moving Toward Reanalysis Martian Atmosphere Breeding: Elucidating Atmospheric Instabilities and Moving Toward Reanalysis

Sep 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009dps....41.4409g&link_type=abstract

American Astronomical Society, DPS meeting #41, #44.09

Astronomy and Astrophysics

Astronomy

Scientific paper

Breeding is a simple technique for elucidating instabilities in a dynamical system. In chaotic systems, such as planetary atmospheres, two initial states that are originally close together will drift apart in the presence of dynamical instabilities. The breeding method introduces random perturbations to a base state, and evolves both states forward in time nonlinearly. At regular intervals, the perturbations are rescaled so that they maintain their original global amplitude. The dominant patterns of instability, or bred vectors, depend only upon the rescaling amplitude and the length of time of the rescaling interval.
Here, we apply the breeding method to the Mars Global Circulation Model of John Wilson. This technique is furthered through the application of mean and perturbation energy equations, which are applied exactly to the base state and bred vector. This allows the specific diagnosis of instability types, clarifies conversions between kinetic and potential energy, and denotes favored locations for error growth, bolstering physical insight into the atmospheric dynamics of Mars.
Breeding experiments can also assist in the optimal tuning of an ensemble data assimilation system, such as the selection of inflation and localization schemes. The MGCM-LETKF Martian Atmosphere Reanalysis Project, described in the abstract of Hoffman et al., will use insights gained from breeding to facilitate the assimilation of MGS TES observations.

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