Investigation of Secular Change of Monthly, Seasonal and Annual Precipitation Separated by Weather Factors

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  • 気象原因別に分離した月・季節・年降水量の経年変化の検討
  • キショウ ゲンイン ベツ ニ ブンリ シタ ツキ キセツ ネン コウスイリョウ ノ ケイネン ヘンカ ノ ケントウ

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This study investigates the secular change of monthly, seasonal and annual precipitation by each weather factor in Nagano city. The weather factors are cyclone, trough, front, typhoon, willter monsoon type pressure pattern, the instability of atmosphere and the other factor. The method of analysis is as follows. First, a period was analyzed in a original time series. Next, the period component was removed from the originai time series, and a residual time series was made. Besides, a regression analysis was put in operation in the residual time series. Finally, a synthesis time series was made by combining the period component with the regression line, where the significant period component and the significant regression line were used only. The synthesis time series were obtained 3 sections in cyclone, 2 sections in front, 3 sections in winter monsoon type pressure pattern, and 10 sections in the other factor. The secular change of precipitation, which reached the synthesis time series, increased or decreased repeating periodic variation regularly or irregularly.

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