摘要
上新世(5.33~2.58 Ma)是距今最近的大气CO_(2)浓度超过400 ppmv的暖期,是理解未来气候变化的地质历史相似型.地质记录显示,上新世气候主要响应地球倾角和岁差变化,比如深海氧同位素和高纬陆相记录表现出强的倾角周期(41 ka),低纬和地中海地区的粉尘和花粉记录以岁差周期(21 ka)为主.然而,这些气候周期空间差异的机制尚不清楚.我们使用全球海气耦合模式HadCM3,开展了轨道参数极值实验.结果表明:(1)倾角变化主要对高纬温度影响显著(>5℃),很好地解释了高纬记录和受高纬冰量调节的深海氧同位素记录的41 ka周期;(2)岁差变化主要影响低纬降水(>2 mm d-1),很好地解释了低纬和地中海地区与季风活动相关的21 ka气候周期.
The Pliocene Epoch(5.33–2.58 Ma)is the last period of sustained warmth before the emergence of the large-scale Pleistocene glaciations.This period was generally warm and wet and is often used as an analogue for near-future climate conditions in terms of CO2 levels(400 ppm,1 ppm=1 lmol/mol),and comparable temperatures.Evaluating the climate system and its fluctuation patterns during the Pliocene warm period provide scientists with the opportunity to understand a warmer-than-present world,and are fundamental to our understanding and ability to accurately project future climate and environmental change.
作者
黄晓芳
杨石岭
Alan Haywood
Julia Tindall
姜大膀
王永达
孙敏敏
张师豪
丁仲礼
Xiaofang Huang;Shiling Yang;Alan Haywood;Julia Tindall;Dabang Jiang;Yongda Wang;Minmin Sun;Shihao Zhang;Zhongli Ding(Key Laboratory of Cenozoic Geology and Environment,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China;College of Earth and Planetary Sciences,University of Chinese Academy of Sciences,Beijing 100049,China;School of Earth and Environment,University of Leeds,Leeds LS29JT,UK;Institute of Atmospheric Physics,Chinese Academy of Sciences,Beijing 100029,China Xiaofang Huang,Shiling Yang1,2,Alan Haywood3,Julia Tindall3,Dabang Jiang4,2,Yongda Wang,Minmin Sun 1,2,Shihao Zhang1,2,Zhongli Ding)
基金
supported by the National Natural Science Foundation of China(41725010 and 42107472)
the Strategic Priority Research Program of Chinese Academy of Sciences(XDB26000000 and XDB31000000)
the Key Research Program of the Institute of Geology&Geophysics,Chinese Academy of Sciences(IGGCAS-201905)。
