- 1Institute for Climate and Atmospheric Science, School of Earth and Environment, University of Leeds, Leeds, United Kingdom of Great Britain – England, Scotland, Wales (j.m.mustafa@leeds.ac.uk)
- 2Centre for Climate Research Singapore, Meteorological Service Singapore, Singapore
The large islands of the Maritime Continent experience a strong diurnal cycle, with enhanced convection and precipitation over land through the afternoon and evening. Convective storms that initiate over land may then propagate out over surrounding coastal waters overnight; the land breeze is typically assumed to drive the overnight convergence of moisture offshore, however some of the offshore moisture convergence may also be attributed to other density current drivers, such as cold pools.
A regional configuration of the MetUM over southwest Sumatra has been used to isolate the influence of cold pool dynamics on the development of the diurnal cycle for three case study days by switching off precipitation re-evaporation (thereby preventing cold pool formation), and these results are compared with control runs with precipitation re-evaporation enabled.
This presentation will offer insight into the contribution of cold pools to offshore propagation of convective storms under different large-scale conditions, and into the influence of model resolution on how well this contribution is resolved.
How to cite: Mustafa, J., Birch, C., Marsham, J., Burns, H., and Peatman, S.: Cold pool contribution to the development of convective storms over southwest Sumatra: insights from sub-km modelling, EGU General Assembly 2025, Vienna, Austria, 27 Apr–2 May 2025, EGU25-2162, https://doi.org/10.5194/egusphere-egu25-2162, 2025.
