2nd Workshop on Cloud Organization (WCO2)

Session

Shallow convection

17 May 2022, 11:00

Public Library (Utrecht)

44. The Organization and Vertical Structure of Shallow Convection in Marine Cold-Air Outbreaks, based on Cold-Air Outbreaks in the Marine Boundary Layer Experiment (COMBLE): Developing the Framework for an Intercomparison Modeling Study

Bart Geerts (University of Wyoming)

17/05/2022, 11:00

Talk

The Arctic’s complex atmospheric environment remains a large source of uncertainty for numerical models across a range of scales, especially during cold-air outbreaks (CAOs). Under CAO conditions, the convective boundary layer grows rapidly with increasing fetch and intricate cloud structures transition from narrow rolls near the ice edge to cells downstream. To study the CAO cloud regime, the...

57. Cold pool and mesh refinement: what is gained at higher resolutions?

Romain Fiévet (Niels Bohr Institute)

17/05/2022, 11:15

Talk

It is well-recognized that triggering of convective cells through cold pools is key to the organization of convection, as reviewed in Zuidema et al. (2017). Yet, numerous studies have found that both the characterization and parameterization of these effects in numerical models is cumbersome - in part due to the lack of numerical convergence (Δx→ 0) achieved in typical cloud-resolving...

28. The ubiquity of mesoscale shallow circulation in the trades

Geet George (Max Planck Institute for Meteorology, Hamburg, Germany)

17/05/2022, 11:30

Talk

From EUREC$^4$A observations, we find evidence for shallow circulations at meso-scales in the trades. Shallow circulations have been shown as one of the main drivers behind genesis and maintenance of convective aggregation. They have been studied in models, as well as been identified in moisture space. We identify similar signals for the first time in physical space. Over time-means of 3-6...

31. On the relationship between precipitation and the spatial structure in trade wind convection

Jule Radtke (Meteorological Institute, Center for Earth System Research and Sustainability, Universität Hamburg; Max Planck Institute for Meteorology, Hamburg, Germany )

17/05/2022, 11:45

Talk

When trade wind convection organises into spatial patterns, it is often in conjunction with precipitation formation, raising the question of the role of convective spatial organisation for precipitation and vice versa. We analyse measurements from the C-band radar Poldirad upstream of Barbados during the EUREC4A field campaign to investigate the spatial behaviour of precipitating shallow...

34. In-Situ Perspectives on the Sub-Cloud Layer during EUREC4A/ATOMIC

Gijs de Boer

17/05/2022, 12:00

Talk

During the ATOMIC and EUREC4A campaigns, the University of Colorado RAAVEN (CU-RAAVEN) uncrewed aircraft system (UAS) was operated in the near-shore environment from Morgan Lewis Barbados. The aircraft conducted 37 research flights, capturing detailed information on the sub-cloud layer and atmospheric boundary layer between 24 January and 15 February. In this presentation, we will provide...