|
Nonlinear Processes in Geophysics |
|
|
|
|
|
|
|
|
|
|
|
|
|
Information - NP2.04 Ultralow-frequency variability of the atmosphere
|
|
|
|
Event Information |
|
|
|
|
|
|
An improved understanding of the physical and dynamical processes related to tropical, mid- and high latitude atmospheric variability is one of the key ingredients for gaining a deeper knowledge of the climate engine. This requires insight into the statistical properties of atmospheric circulation regimes for the current climate, as well as an understanding of the interactions between baroclinic systems and planetary circulation patterns on seasonal time scales.
One main aim of this session is to consider possible causes for ultralow-frequency variability (ULFV) and regime behaviour in the tropics, midlatitudes and polar regions. Major issues are the connection with the tropics in relation to midlatitude LFV (e. g. the influence of ENSO on regime statistics, sensitivity to tropical warming and SSTs, shifts of the subtropical jet), changes in the ULFV of the atmosphere under the influence of changed radiative forcing, and the relation with stratospheric dynamics.
Observational and modelling studies are equally encouraged, with modelling studies expected to span the range of model hierarchy from simplified models to coupled AOGCMs.
Possible topics in this session are:
* ULFV in observations, simplified models and GCMs
* Circulation regimes and teleconnection patterns of the atmosphere
* Nonlinear forcing of low-frequency variability in simplified and coupled models
* Origin of atmospheric ULFV and changes in an altered climate under global warming
* Effects of orography, thermal forcing and synoptic-scale forcing on circulation regimes and low-frequency variability
* Influence of the tropics on midlatitude ULFV
|
|
|
|
|
|
|
Back to Session Programme
|
|
|
|