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Cloud-cloud interaction in convective precipitation

Objective

"State-of-the-art simulations and observations highlight the self-organization of convective clouds. Our recent work shows two aspects: these clouds are capable of unexpected increase in extreme precipitation when temperature rises; interactions between clouds produce the extremes. As clouds interact, they organize in space and carry a memory of past interaction and precipitation events. This evidence reveals a severe shortcoming of the conventional separation into ""forcing"" and ""feedback"" in climate model parameterizations, namely that the ""feedback"" develops a dynamics of its own, thus driving the extremes. The major scientific challenge tackled in INTERACTION is to make a ground-breaking departure from the established paradigm of ""quasi-equilibrium"" and instantaneous convective adjustment, traditionally used for parameterization of ""sub-grid-scale processes"" in general circulation models. To capture convective self-organization and extremes, the out-of-equilibrium cloud field must be described. In INTERACTION, I will produce a conceptual model for the out-of-equilibrium system of interacting clouds. Once triggered, clouds precipitate on a short timescale, but then relax in a ""recovery"" state where further precipitation is suppressed. Interaction with the surroundings occurs through cold pool outflow,facilitating the onset of new events in the wake. I will perform tailored numerical experiments using cutting-edge large-eddy simulations and very-high-resolution observational analysis to determine the effective interactions in the cloud system. Going beyond traditional forcing-and-feedback descriptions, I emphasize gradual self-organization with explicit temperature dependence. The list of key variables of atmospheric water vapor, temperature and precipitation must therefore be amended by variables describing organization. Capturing the self-organization of convection is essential for understanding of the risk of precipitation extremes today and in a future climate.
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Call for proposal

ERC-2017-COG
See other projects for this call

Funding Scheme

ERC-COG - Consolidator Grant

Host institution

LEIBNIZ-ZENTRUM FUR MARINE TROPENFORSCHUNG (ZMT) GMBH
Address
Fahrenheitstrasse 6
28359 Bremen
Germany
Activity type
Private for-profit entities (excluding Higher or Secondary Education Establishments)
EU contribution
€ 1 073 577,01

Beneficiaries (2)

LEIBNIZ-ZENTRUM FUR MARINE TROPENFORSCHUNG (ZMT) GMBH
Germany
EU contribution
€ 1 073 577,01
Address
Fahrenheitstrasse 6
28359 Bremen
Activity type
Private for-profit entities (excluding Higher or Secondary Education Establishments)
KOBENHAVNS UNIVERSITET
Denmark
EU contribution
€ 241 222,99
Address
Norregade 10
1165 Kobenhavn
Activity type
Higher or Secondary Education Establishments