|From||"Roger Brugge" <email@example.com>|
|Date||Tue, 8 Oct 2013 12:48:53 +0000|
Position: PhD Location: Dept of Meteorology, Stockholm University Closing date: November 20, 2013 Duration: 4 years Starting date: around new year or soon after. This project aims at identifying links between the jet stream variability and the atmospheric system's attractor. Low-frequency variability in midlatitude weather is a topic of intensive research because of its importance in understanding and improving predictability in weather and climate. The nature of this variability is a subject of ongoing debate between two mainstream paradigms: linear or nonlinear. Recent research on the jet stream variability provides some evidence in support of the nonlinear paradigm. This entails the existence of nonlinear circulation regimes; recurrent and quasi-stationary states of the midlatitude large-scale flow. These flows may be associated with different states of the midlatitude jet stream and this association can enhance the predictability of weather regimes and transitions and ultimately improve weather and climate predictions. The behavior of the system is defined not only by the quasi-stationary states but also various (weakly) unstable periodic orbits (UPO), such as the 25-day oscillation. These also define the statistical properties of the system, such as the climatology of for example the storm track. Since most of the weather and climate of the midlatitudes is associated one way or another with the midlatitude jet streams, the system's stationary states (or weather regimes) and UPOs are expected to be the primary controller of the jet stream variability. The project will involve using simplified quasi-geostrophic models, for example barotropic and baroclinic models on the sphere, as well as comprehensive general circulation models and reanalysis data. Application procedure is explained here http://www.misu.su.se/about-us/vacancies
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