2nd Workshop on Cloud Organization (WCO2)

Session

Wind, radiation and organisation

19 May 2022, 09:15

Public Library (Utrecht)

73. Mesoscale organization of shallow convection: the role of rain and cold pools

Raphaela Vogel

19/05/2022, 09:15

Talk

Shallow-convective organization and rain are two sides of the same coin. The mesoscale organization of shallow convection tends to increase rain rates, and rain is an important ingredient for organising shallow convection. Rain induces mesoscale organization preferentially through evaporatively-driven downdrafts, which trigger cold pools that spread out at the surface as density currents. Cold...

50. How well can we simulate mesoscale cloud organisation as observed during EUREC4A ?

Pier Siebesma (Delft University of Technology), Louise Nuijens (TU Delft)

19/05/2022, 09:45

Talk

It has become clear over the last couple of years that shallow cumulus convection over the subtropical oceans has a strong tendency to develop itself into a rich variety of spatial cloud structures. It is particular challenging to simulate these mesoscale cloud patterns. On the one hand, it requires turbulence resolving resolutions of 100 m to represent the vertical convective mixing processes...

45. Low-level radiative cooling peaks in regimes of shallow convective organization

Benjamin Fildier (Laboratoire de Météorologie Dynamique, ENS, Paris)

19/05/2022, 10:00

Talk

In models, a local maximum of clear-sky radiative cooling in the lower troposphere often appears as a necessary condition for the development and persistence of convective organization. However, no robust understanding has been provided for the emergence and disappearance of lower-tropospheric cooling in the atmosphere. Here we propose a theoretical characterization of clear-sky radiative...

72. Wind-responsive diurnal sea skin temperature for large-eddy simulations

Reyk Börner (University of Reading)

19/05/2022, 10:15

Talk

The diurnal variability of sea skin temperature (SST) is suspected to play an important role for convective organization above the tropical ocean, from driving cumulus congestus convection to triggering the active phase of the Madden-Julian Oscillation. Recent cloud-resolving simulations demonstrate how imposed diurnal SST oscillations strongly impact mesoscale convective aggregation,...