岁差周期

地轴倾角周期和岁差周期引起的地层旋回厚度变化范围分别为254～43m和123～191m。

The thickness ranges of sedimentary cycles caused by the eccentricity cycle , the obliquity cycle and the precession cycle are respective 8.72 ~ 11.29 m , 2.54 ~ 4.3 m and 1.23 ~ 1.91 m.

只是在岁差周期上，南海南北部1143站和1144站所有的四个东亚季风替代性标志才表现出与轨道驱动和全球冰量变化相似的相关系数和相位关系。

Only on the precession band , however , did all monsoon tracers recorded at Site 1143 reveal similar coherency and phase relationships with the radiation forcing and the global ice volume change .

其成因可能是由于当时中、低纬度岁差周期高辐射所造成的海洋表面温度升高，蒸发加强，西风环流和夏季风为西北提供的水汽大幅度增多的缘故。

The causes responsible for such changes were probably due to the increase in ocean surface temperature and evaporation resulted from high radiation caused by precessional at middle and low latitudes and therefore westerly circulation and summer monsoon carried large amount of moisture to Northwest China .