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中文摘要：
赤道太平洋气候在晚上新世进入一个重大转型期.具体表现为全球海表温度（SST）开始变冷,东西太平洋SST梯度开始形成并逐渐加大.不仅如此,这一变化几乎与北半球高纬冰盖扩张同步发生.探讨太阳辐射、高纬和低纬气候变化之间的相互关系是揭示这一气候转型机制的关键.通过一系列数理统计方法对赤道太平洋的SST和全球冰量变化中的轨道周期成分进行分析发现,北半球高纬的太阳累积辐射量是此次气候转型的主要外部驱动力;在轨道尺度上,东西赤道太平洋的SST在转型之后表现出基本同步而非＂跷跷板＂式的变化规律;通过分析对比认为晚上新世气候转型起源于地球轨道参数的转变,而大气CO2浓度变化产生的反馈效应使得全球气候自早新生代以来进一步变冷.
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