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October 2013
Message 33

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[Met-jobs] PhD student position in Dynamic Meteorology

From "Roger Brugge" <r.brugge@reading.ac.uk>
To "met-jobs@lists.reading.ac.uk" <met-jobs@lists.reading.ac.uk>
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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