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Discussion papers
https://doi.org/10.5194/acp-2018-780
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2018-780
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 30 Aug 2018

Research article | 30 Aug 2018

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Chemistry and Physics (ACP).

Core and margin in warm convective clouds. Part I: core types and evolution during a cloud's lifetime

Reuven H. Heiblum, Lital Pinto, Orit Altaratz, Guy Dagan, and Ilan Koren Reuven H. Heiblum et al.
  • Department of Earth and Planetary Sciences, Weizmann Institute of Science, Rehovot, Israel

Abstract. The properties of a warm convective cloud are determined by the competition between the growth and dissipation processes occurring within it. One way to observe and follow this competition is by partitioning the cloud to core and margin regions. Here we look at three core definitions: positive vertical velocity (Wcore), supersaturation (RHcore), and positive buoyancy (Bcore), and follow their evolution throughout the lifetime of warm convective clouds.

We show that the different core types tend to be proper subsets of one another in the following order: BcoreRHcoreWcore. Using single cloud and cloud field simulations, we find that this property is generally maintained during the growing and mature stages of a cloud's lifetime, but can break down during the dissipation stage. The cloud and its cores are centered at a similar location, while during dissipation the cores may reside at the cloud periphery.

A theoretical model is developed, showing that in both the adiabatic and non-adiabatic cases, Bcore can be expected to be the smallest core, due to two main reasons: (i) entrainment rapidly decreases the buoyancy core compared to the other core types, and (ii) convective clouds may exist while being completely negatively buoyant (while maintaining positive vertical velocity and supersaturation).

Reuven H. Heiblum et al.
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Reuven H. Heiblum et al.
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