Pollen-based continental climate reconstructions at 6 and 21 ka: a global synthesis
Pollen-based continental climate reconstructions at 6 and 21 ka: a global synthesis
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DOI：
10.1007/s00382-010-0904-1
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发表时间：
2011-08-01
期刊：
影响因子：
4.6
通讯作者：
Wu, H.
中科院分区：
文献类型：
--
作者：
Bartlein, P. J.;Harrison, S. P.;Wu, H.
亚化石花粉和植物大化石资料可以提供冰期和间冰期气候的定量信息。这些数据允许重建与生长期温暖、冬季寒冷和植物可用水分有关的气候变量。对中全新世（MH，约6 ka）和末次盛冰期（LGM，约21 ka）进行了大陆尺度的重建，以便与目前作为政府间气候变化专门委员会第五次评估报告（AR5）的一部分进行的古气候模拟进行比较。本文综合了利用现代模拟、回归和模式反演技术获得的4个温度变量和2个湿度变量的MH和LGM气候重建及其不确定性。基于表面花粉组合的相同变量的重建显示出准确和无偏性。重建的LGM和MH气候异常模式在变量之间具有一致性和一致性，在技术选择方面具有鲁棒性。它们支持控制晚第四纪气候变化的概念模式，即轨道变化和温室强迫对季节温度循环的一级效应可通过大气环流和地表能量平衡的响应而可预测地修正。
Subfossil pollen and plant macrofossil data derived from C-14-dated sediment profiles can provide quantitative information on glacial and interglacial climates. The data allow climate variables related to growing-season warmth, winter cold, and plant-available moisture to be reconstructed. Continental-scale reconstructions have been made for the mid-Holocene (MH, around 6 ka) and Last Glacial Maximum (LGM, around 21 ka), allowing comparison with palaeoclimate simulations currently being carried out as part of the fifth Assessment Report (AR5) of the Intergovernmental Panel on Climate Change. The synthesis of the available MH and LGM climate reconstructions and their uncertainties, obtained using modern-analogue, regression and model-inversion techniques, is presented for four temperature variables and two moisture variables. Reconstructions of the same variables based on surface-pollen assemblages are shown to be accurate and unbiased. Reconstructed LGM and MH climate anomaly patterns are coherent, consistent between variables, and robust with respect to the choice of technique. They support a conceptual model of the controls of Late Quaternary climate change whereby the first-order effects of orbital variations and greenhouse forcing on the seasonal cycle of temperature are predictably modified by responses of the atmospheric circulation and surface energy balance.