Eastward-Propagating Property of Large-Scale Precipitation Systems Simulated in the Coarse-Resolution NICAM and an Explanation of its Appearance

DOI Web Site 被引用文献6件 参考文献13件 オープンアクセス
  • Yoshizaki Masanori
    Research Institute for Global Changes, JAMSTEC
  • Iga Shi-ichi
    Advanced Institute for Computational Sciences, RIKEN
  • Satoh Masaki
    Research Institute for Global Changes, JAMSTEC Atmosphere and Ocean Research Institute, The University of Tokyo

説明

Using the Non-hydrostatic ICosahedral Atmospheric Model (NICAM) on an aqua-planet with a uniform longitudinal sea surface temperature, precipitation systems (PSs) with coarse horizontal resolutions are studied. An eastward-propagating (EP) property of the PSs is seen even though the horizontal resolution becomes coarser to 112 km, as long as the vertical stratification is kept conditionally unstable. The appearance or disappearance of the EP property is explained in comparison with mesoscale (100 km) and large-scale (1,000 km) PSs, a non-precipitation system (NPS), and a system simulated by a dry model with positive-only wave CISK heating (DP). By assuming that the height and the updraft intensity of convection are common in these systems, the turnover times of representative convections are estimated. Compared with the time scale of the equatorial beta (Tβ), where its effect essentially works and the distinct EP property appears, the turnover times of the large-scale PS and DP are longer than Tβ, producing the EP property, whereas those of the NPS and mesoscale PSs are shorter, inducing no EP property. These results are consistent with observations and model outputs (Nakazawa 1988; Nasuno et al. 2007, 2008).

収録刊行物

  • SOLA

    SOLA 8 (0), 21-24, 2012

    公益社団法人 日本気象学会

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