等圧線










この画像では同心円状に描かれている線が等圧線である。


等圧線（とうあつせん）は地上天気図で同じ気圧の地点を結んだ線。各地に位置するそれぞれの観測地点でのデータを海面上の高さに補正したもの（これを海面更正という）をもとに作成する。等圧線は前線をはさむ場合を除いて急激にカーブすることはなく、交差することもない。等圧線が混み合うほど気圧の傾きが急になるために風が強くなる。


等圧線は通常1000hPaを基準に4hPa間隔で引かれ、5本 (20hPa) 間隔で太線が引かれる。



関連項目



  • 等値線

  • 等高線

  • 等圧面








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