Jisho

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かこうきりゅう 下降気流
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Noun
1. downward air current​See also ダウンバースト
Wikipedia definition
2. Vertical draft​For the band, see Air Pocket (band) An updraft or downdraft is the vertical movement of air as a weather related phenomenon. One of two forces causes the air to move. Localized regions of warm or cool air will exhibit vertical movement. A mass of warm air will typically be less dense than the surrounding region, and so will rise until it reaches air that is either warmer or less dense than itself. The converse will occur for a mass of cool air, and is known as subsidence.
Read “Vertical draft” on English Wikipedia
Read “下降気流” on Japanese Wikipedia
Read “Vertical draft” on DBpedia

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