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第四纪冰期循环40ka周期的一种解释以及模拟尝试

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摘要 越来越多的资料证实,从第四纪和第三纪晚期到大约900ka前的中更新世转变前(MPT,mid-Pleistocene transition),北半球冰期变化周期为40ka,MPT之后转变为100ka.一般作为外强迫来解释冰期间冰期循环的北半球中高纬度夏季太阳辐射变化是由地球轨道进动控制的,但其主要周期是20ka,这和实际的冰期间冰期循环的周期不相符.定义了一个能量指标C和响应阈值Ct,前者表示外部辐射能量的供给大小,后者代表了气候系统的整体响应.C与Ct的大小关系决定冰原融化或者积累,控制间冰期的开始和结束的时间,并决定冰期循环的周期.基于能量阈值假设,从一个概念模式出发对冰期循环周期和控制因子进行了模拟试验.结果显示,能量指标C和阈值Ct不仅能够解释中更新世转变之前冰期的40ka周期变化,也能够部分地解释MPT之后冰期的准100ka周期变化,其中40ka是冰期循环的基本周期,从而揭示了MPT前后气候系统变化和周期演变的内在连续性.
作者 李南 陈星
出处 《科学通报》 EI CAS CSCD 北大核心 2007年第10期1181-1189,共9页 Chinese Science Bulletin
基金 国家自然科学基金(批准号:40475035) 国家重点基础研究发展计划(编号:2006CB400500)资助项目
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