Patterns of vegetation and climate change in the northern South China Sea during the last glaciation inferred from marine palynological records
Patterns of vegetation and climate change in the northern South China Sea during the last glaciation inferred from marine palynological records
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从海洋孢粉学记录推断末次冰期南海北部植被格局和气候变化
DOI：
10.1016/j.palaeo.2015.08.041
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发表时间：
2015-12-15
影响因子：
3
通讯作者：
Mao, Limi
中科院分区：
文献类型：
--
作者：
Dai, Lu;Weng, Chengyu;Mao, Limi
南海北方高分辨率海洋孢粉记录提供了末次冰期（-70-19 calkaBP）区域植被和气候条件的新信息。保存丰富的花粉从热带和亚热带阔叶树（主要由万年青栎属，锥属，和大戟科）表明，南亚热带气候盛行在末次冰期，包括末次盛冰期。相对较高的百分比，这样的花粉类群发生在海洋同位素阶段（MIS）3，当Phyllocladus花粉从南部也增加，表明一个温暖的陆地气候和加强东亚夏季风相比，MIS 4和2。此外，这种花粉的最大百分比发生在早期MIS 3，这意味着最佳气候盛行在这一时期。重建的陆地气候与海洋证据，如6180值从南极有孔虫壳和记录的海面温度相对应。这项研究证实，区域陆地气候可能与地球轨道参数变化引起的全球冰量和东亚季风变化密切相关。现代孢粉学调查和花粉含量统计分析表明，南海北方松属植物的花粉和孢子易被水流搬运。因此，它们的相对丰度峰值表明，在末次冰期期间发生了几次湿间隔。(C)2015爱思唯尔B. V.保留所有权利。
High-resolution marine palynological records from the northern South China Sea (SCS) provide new information concerning the regional history of vegetation and climate conditions during the last glaciation (-70-19 cal ka BP). The preservation of rich pollen from tropical and subtropical broadleaf trees (largely composed of evergreen Quercus, Castanopsis, and Euphorbiaceae) suggests that a southern subtropical climate prevailed during the last glaciation, including the period of the Last Glacial Maximum. Relatively higher percentages of such pollen taxa occurred during Marine Isotope Stage (MIS) 3, when Phyllocladus pollen from the south also increased, indicating a warmer terrestrial climate and a strengthened East Asian summer monsoon comparing to MIS 4 and 2. Moreover, the maximum percentages of such pollen occurred during the early MIS 3, implying that an optimal climate prevailed in this period. The reconstructed terrestrial climate corresponds well to marine evidence such as 6180 values from planktonic foraminifer shell and records of sea surface temperature. This study confirmed that the regional terrestrial climate could be linked closely to changes in both global ice volume and the East Asian monsoon attributable to variations of the earth's orbital parameters. Modern palynological investigations and statistical analyses of the pollen percentages in the profiles indicate that Pinus pollen and spores are easily transported by water flow in the northern SCS. Therefore, their relative abundance peaks suggest that several wet intervals occurred during the last glaciation. (C) 2015 Elsevier B.V. All rights reserved.