4Dの概説

Dust 砂塵嵐

砂塵嵐

砂塵嵐

砂塵嵐とは、塵や砂が強風により激しく吹き上げられ、上空高くに舞い上がる現象。空中の砂塵により、見通し(視程)が著しく低下する。砂漠などの乾燥地において発生する。

参考文献

WMO: International Cloud Atlas Volume I, Manual on the Observation of Clouds and other Meteors, 120-121, 1975.
http://library.wmo.int/opac/index.php?lvl=notice_display&id=5357#.VJyThP87ALN


Dust storm

An ensemble of particles of dust or sand energetically lifted to great heights by a strong and turbulent wind. For details, dust storms or sandstorms generally occur in areas where the ground is covered with loose dust or sand; sometimes, after having travelled over more or less great distances, they may be observed over areas where no dust or sand covers the ground. The forward portion of a dust storm or sandstorm may have the appearance of a wide and high wall which advances more or less rapidly. Walls of dust or sand often accompany a cumulonimbus which may be hidden by the dust or the sand particles; they may also occur without any clouds along the forward edge of an advancing cold air mass.

References

WMO: International Cloud Atlas Volume I, Manual on the Observation of Clouds and other Meteors, 120-121, 1975.
http://library.wmo.int/opac/index.php?lvl=notice_display&id=5357#.VJyThP87ALN

このページの先頭へ