The Brueckner cycle was proposed by German climatologist E. Brückner (1890) as a cycle of about 35 years observed in secular changes in climate. He started by finding that the water level of the Caspian Sea fluctuates on an average cycle of 34 to 36 years, and discovered the existence of a cycle close to 35 years by statistically examining a large number of data, such as the water levels of the Black Sea, the Baltic Sea, and the Volga River, the standard number of days that Russian rivers freeze, and the advance and retreat of Alpine glaciers. Subsequent research revealed that precipitation, air pressure, and temperature also fluctuate with a similar cycle. The phase of the Brueckner cycle is not uniform worldwide, but varies regionally; for example, it is in opposite phase in continental interiors and coastal regions. The 35-year cycle is about three times the sunspot cycle, so the Brueckner cycle is thought to be related to the sunspot number. Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information |
ドイツの気候学者 E.ブリュックナーによって提唱された (1890) 気候の永年変化に認められる約 35年の周期をいう。最初カスピ海の水位が 34~36年の平均周期で上下する事実から出発し,黒海,バルト海,ボルガ川の水位,ロシアの河川の標準凍結日数,アルプス氷河の前進後退など多数の資料を統計的に調べることによって 35年に近い周期の存在を発見した。その後の調査で降水量,気圧,気温にも同じような周期の変動がみられることがわかった。ブリュックナー周期の位相は世界的に一様ではなく地域的なずれがあり,たとえば大陸内部と海岸地方では逆位相になる。 35年周期は太陽黒点の周期の約3倍にあたるのでブリュックナー周期は太陽黒点数とも関係していると考えられている。
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