Dr. Matthias Brueck (MPI für Meteorologie, Hamburg)
Wednesday, January 10, 2018 - 15:15
FU Berlin, Pi-Gebäude
Arnimallee 6, 14195 Berlin, SR 025/026
Convection resolving simulations (2 km to 100 m grid) for the tropical Atlantic region (9000x3300 km) are performed using the icosahedral non-hydrostatic (ICON) model for two seasons. Deactivating the convection parameterization facilitates the explicit evolution of moist convection across horizontal scales, enabling rich interactions with their environment and neighboring convective cells. The emerging fine scale structure of the ITCZ is linked to the internal structure of its deep convective objects, while the large-scale degree of organization is analyzed in context to mesoscale- and convection induced circulations. Small-scale surface convergence plays an important role in triggering new convection at the leading fronts of larger mesoscale convective clusters. This dynamical component of convection challenges the traditional thermodynamic design of convection parameterizations in which atmospheric instability is balanced locally.
submitted by Stephan Gerber (stephan.gerber@fu-berlin.de, 030 83859322)