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Two Different Pathways toward Self-aggregation under Radiative-convective Equilibrium between SCALE and VVM
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  • Jin-De Huang,
  • Chien-Ming Wu,
  • Hiroaki Miura,
  • Ching-Shu Hung
Jin-De Huang
National Taiwan University
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Chien-Ming Wu
National Taiwan University

Corresponding Author:mog@as.ntu.edu.tw

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Hiroaki Miura
University of Tokyo
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Ching-Shu Hung
University of Tokyo
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Abstract

Two cloud-resolving models (SCALE and VVM) take different pathways toward convective self-aggregation under a radiative-convective equilibrium condition, although the model setups are the same. The physical processes driving the development of self-aggregation in SCALE and VVM, respectively, correspond to the mechanisms for self-aggregation in cold and warm climate states discussed in a previous study. Analyses in the moisture space show that radiative cooling in the dry area mainly drives the aggregation in SCALE, while subsidence induced by the convection in the moist region dominates in VVM. The transition of the convective circulation from convective scale to mesoscale is found on the isentropic diagram in VVM, but this transition is unclear in SCALE. The convective clouds with larger sizes are rare in SCALE. The frequent occurrence of larger convective clouds efficiently drives self-aggregation from the moist area in VVM. These results provide a new insight to understand convective self-aggregation among models.