An energy balance model for low--level clouds based on a simulation resolving mesoscale motions

Yoshiaki Miyamoto, Yousuke Sato, Seiya Nishizawa, Hisashi Yashiro, Tatsuya Seiki, Akira T. Noda

Research output: Contribution to journalArticlepeer-review

Abstract

This study proposes a new energy balance model to determine the cloud fraction of low-level clouds. It is assumed that the horizontal cloud field consists of several individual cloud cells with a similar structure. Using a high–resolution simulation dataset with a wide numerical domain, we conducted an energy budget analysis. Here we show that the energy injected into the domain by surface flux is approximately balanced with that loss due to radiation and advection due to large–scale motion. The analysis of cloud cells within the simulated cloud field showed that the cloud field consists of a number of cloud cells with similar structures. We developed a simple model for the cloud fraction from the energy conservation equation. The cloud fraction determined using the model developed in this study was able to quantitatively captured the simulated cloud fraction.

Original languageEnglish
Pages (from-to)987-1004
Number of pages18
JournalJournal of the Meteorological Society of Japan
Volume98
Issue number5
DOIs
Publication statusPublished - 2020 Oct

Keywords

  • Cloud microphysics
  • Convection
  • Low–level clouds

ASJC Scopus subject areas

  • Atmospheric Science

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