TY  - JOUR
A1  - Totz, Sonja Juliana
A1  - Eliseev, Alexey V.
A1  - Petri, Stefan
A1  - Flechsig, Michael
A1  - Caesar, Levke
A1  - Petoukhov, Vladimir
A1  - Coumou, Dim
T1  - The dynamical core of the Aeolus 1.0 statistical-dynamical atmosphere model
BT  - validation and parameter optimization
JF  - Geoscientific model development : an interactive open access journal of the European Geosciences Union
N2  - Here, we present novel equations for the large-scale zonal-mean wind as well as those for planetary waves. Together with synoptic parameterization (as presented by Coumou et al., 2011), these form the mathematical description of the dynamical core of Aeolus 1.0. The regions of high azonal wind velocities (planetary waves) are accurately captured for all validation experiments. The zonal-mean zonal wind and the integrated lower troposphere mass flux show good results in particular in the Northern Hemisphere. In the Southern Hemisphere, the model tends to produce too-weak zonal-mean zonal winds and a too-narrow Hadley circulation. We discuss possible reasons for these model biases as well as planned future model improvements and applications.
Y1  - 2018
U6  - https://doi.org/10.5194/gmd-11-665-2018
SN  - 1991-959X
SN  - 1991-9603
VL  - 11
IS  - 2
SP  - 665
EP  - 679
PB  - Copernicus
CY  - Göttingen
ER  - 
TY  - JOUR
A1  - Stadtherr, Lisa
A1  - Coumou, Dim
A1  - Petoukhov, Vladimir
A1  - Petri, Stefan
A1  - Rahmstorf, Stefan
T1  - Record Balkan floods of 2014 linked to planetary wave resonance
JF  - Science Advances
N2  - In May 2014, the Balkans were hit by a Vb-type cyclone that brought disastrous flooding and severe damage to Bosnia and Herzegovina, Serbia, and Croatia. Vb cyclones migrate from the Mediterranean, where they absorb warm and moist air, to the north, often causing flooding in central/eastern Europe. Extreme rainfall events are increasing on a global scale, and both thermodynamic and dynamical mechanisms play a role. Where thermodynamic aspects are generally well understood, there is large uncertainty associated with current and future changes in dynamics. We study the climatic and meteorological factors that influenced the catastrophic flooding in the Balkans, where we focus on large-scale circulation. We show that the Vb cyclone was unusually stationary, bringing extreme rainfall for several consecutive days, and that this situation was likely linked to a quasi-stationary circumglobal Rossby wave train. We provide evidence that this quasi-stationary wave was amplified by wave resonance. Statistical analysis of daily spring rainfall over the Balkan region reveals significant upward trends over 1950-2014, especially in the high quantiles relevant for flooding events. These changes cannot be explained by simple thermodynamic arguments, and we thus argue that dynamical processes likely played a role in increasing flood risks over the Balkans.
Y1  - 2016
U6  - https://doi.org/10.1126/sciadv.1501428
SN  - 2375-2548
VL  - 2
PB  - American Assoc. for the Advancement of Science
CY  - Washington
ER  - 
TY  - GEN
A1  - Levermann, Anders
A1  - Petoukhov, Vladimir
A1  - Schewe, Jacob
A1  - Schellnhuber, Hans Joachim
T1  - Abrupt monsoon transitions as seen in paleorecords can be explained by moisture-advection feedback
T2  - Proceedings of the National Academy of Sciences of the United States of America
Y1  - 2016
U6  - https://doi.org/10.1073/pnas.1603130113
SN  - 0027-8424
VL  - 113
SP  - E2348
EP  - E2349
PB  - National Acad. of Sciences
CY  - Washington
ER  -