An Energy Balance Model for Low--Level Clouds Based on a Simulation Resolving Mesoscale Motions

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  • MIYAMOTO Yoshiaki
    Faculty of Environment and Information Studies, Keio University, Kanagawa, Japan RIKEN Center for Computational Science, Kobe, Japan Meteorological Research Institute, Tsukuba, Japan
  • SATO Yousuke
    RIKEN Center for Computational Science, Kobe, Japan Faculty of Science, Hokkaido University, Sapporo, Japan
  • NISHIZAWA Seiya
    RIKEN Center for Computational Science, Kobe, Japan
  • YASHIRO Hisashi
    RIKEN Center for Computational Science, Kobe, Japan
  • SEIKI Tatsuya
    Japan Agency for Marine-Earth Science and Technology, Yokohama, Japan
  • NODA Akira T.
    Japan Agency for Marine-Earth Science and Technology, Yokohama, Japan

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  • メソスケールの流れを解像したシミュレーションを基にした下層雲のエネルギー平衡モデルの構築

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<p>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.</p>

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