EGU22-7264
https://doi.org/10.5194/egusphere-egu22-7264
EGU General Assembly 2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.

On the relationship between precipitation and the spatial structure of trade wind convection

Jule Radtke1,2, Ann Kristin Naumann1,2, Raphaela Vogel3, Martin Hagen4, and Felix Ament1
Jule Radtke et al.
  • 1Meteorological Institute, Center for Earth System Research and Sustainability, Universität Hamburg, Hamburg, Germany (jule.radtke@uni-hamburg.de)
  • 2Max Planck Institute for Meteorology, Hamburg, Germany
  • 3Laboratoire de Météorologie Dynamique (LMD), Paris, France
  • 4Deutsches Zentrum für Luft- und Raumfahrt (DLR), Institut für Physik der Atmosphäre, Oberpfaffenhofen, Germany

Trade wind convection organises into a rich spectrum of spatial patterns, often in conjunction with precipitation development. This raises the question of the role of precipitation for spatial organization and vice versa. Using rain radar measurements during the EUREC4A field campaign we find that precipitation rates vary mainly independently from the spatial arrangement of precipitating cells. Mean precipitation increases with the size or number of cells, as it is closely related to the precipitating area. The cells’ degree of clustering, contrary, is typically greatest where the mean cell size is large and the cell number small. Consequently, scenes with a quite different spatial structure – with larger, more clustered convective structures at one time or with more numerous and distributed convective structures at another time – can have similar precipitation rates. Could spatial organization be a process to maintain precipitation rates in very different environments? We exploit large-domain realistic large eddy simulations to investigate scenes of trade wind convection that exhibit similar precipitation rates but different spatial structures. We discuss how the environment and circulation differ in these scenes and how this might necessitate different spatial structures to rain.

How to cite: Radtke, J., Naumann, A. K., Vogel, R., Hagen, M., and Ament, F.: On the relationship between precipitation and the spatial structure of trade wind convection, EGU General Assembly 2022, Vienna, Austria, 23–27 May 2022, EGU22-7264, https://doi.org/10.5194/egusphere-egu22-7264, 2022.

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