Shamekh Sara
Country
Iran
Curriculum Vitae
Shamekh Sara404.25 KB
ESR11 - Lagrangian estimates of entrainment rates in clouds
Objectives
  • Computing balloon Lagrangian trajectories from LES outputs in shallow cumulus and stratocumulus conditions.  
  • Comparison with data from mini radioprobes from WP2.
  • Specific adjustement to Lagrangian trajectories will have to be implemented to take into account balloon dynamics.
  • Rates of mixing will be estimated at the interfaces of cloudy and clear air.
Expected Results

Transfer of knowledge from microprobes to the weather/climate modelling community.

Planned secondment(s)
  • ENV (Torino)                        Month 9: radiosondes for devices for trajectories measurements
  • ISAC & POLITO (Torino)     Month 10: trajectory computations methods, LES modelling
  • MPG (Goettingen)                Month 17-18: comparison with experiments
  • MPIM (Bonn)                        Month 27-28
Comments

The general objective of the thesis is to perform sensitivity studies of the representation of the convective clouds in a high-resolution model with the aim of acquiring knowledge and of proposing improvements of the convective parameterization in GCM. The work will concern on the shallow cloudiness that can play an important role in the origin in the organization of the deep convection, especially at the diurnal time scale. The study will be focused on the formation of clouds over an island.  Several physical processes at the origin of the variability of the cloud cover characteristics will be examined such as the role of dry air entrainment (cloud dissipation), the role of aerosol concentration (physical and microphysical processes), the role of surface conditions, of the size and orography of the island (and their mesoscale effects), the larger scale conditions  Technically, the work will be based on simulations of shallow and deep cloudiness in cloud resolving models (CRM) and Large Eddy Simulations (LES) that will be specifically performed, or that already exists in the framework of collaborative projects. These models will give information on the physical sources of variability of the shallow convective cloudiness.

Publications

The impact of ocean temperature anomalies on the aggregation of deep convective clouds

Year
2019
Document type
Other
Authors
S. Shamekh, C. Muller, J-P. Duvel, F. D’Andrea
Source

CFMiP Meeting on Clouds, Precipitation, Circulation and Climate Sensitivity. 30 September 2019 to 4 October 2019. Mykonos, Greece. 

CFMIP_20193.93 MB

How do ocean warm anomalies favor the aggregation of deep convective clouds?

Year
2019
Document type
Article
Authors
S. Shamekh, C. Muller, J. P. Duvel, F. D'Andrea
Source

S. Shamekh, C. Muller, J. P. Duvel, F. D'Andrea How do ocean warm anomalies favor the aggregation of deep convective clouds? American Meteorological Society. 2019. 

Shamekh5.89 MB

The impact of SST anomalies on the aggregation of convective clouds

Year
2019
Document type
Other
Authors
S. Shamekh, C. Muller, J. P. Duvel, F. D'Andrea
Source

EGU General Assembly 2019. 7 - 12 April 2019. Vienna, Austria.