Dry Intrusions Following Eastward-Propagating Synoptic-Scale Cloud Systems over Sumatera Island

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  • MURATA Fumie
    Research Institute for Humanity and Nature, Kyoto
  • YAMANAKA Manabu D.
    Graduate School of Science and Technology, Kobe University Institute of Observational Research for Global Change, Japan Agency for Marine-Earth Science and Technology, Yokosuka
  • HASHIGUCHI Hiroyuki
    Research Institute for Sustainable Humanosphere, Kyoto University
  • MORI Shuichi
    Institute of Observational Research for Global Change, Japan Agency for Marine-Earth Science and Technology, Yokosuka
  • KUDSY Mahally
    Agency for the Assessment and Application of Technology, Jakarta Pusat
  • SRIBIMAWATI Tien
    Agency for the Assessment and Application of Technology, Jakarta Pusat
  • SUHARDI Budi
    Indonesian Meteorological and Geophysical Agency, Jakarta Pusat
  • EMRIZAL
    Indonesian Meteorological and Geophysical Agency, Jakarta Pusat

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Abstract

We observed four dry intrusions that occurred over Sumatera Island (Sumatra) during the intensive rawinsonde observation periods in 1998-2004. The events were accompanied by westerly winds, and included the passage of a single organized synoptic-scale cloud system, with a structure similar to a squall line. The cloud systems had the properties of a Kelvin wave. Eastward propagation speed was around 13 m/s, and the horizontal scale was several thousand kilometers. Severe rain occurred as the cloud systems passed, and dry intrusion suppressed convections in the rear part.

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