Orbital- and sub-orbital-scale climate impacts on vegetation of the western Mediterranean basin over the last 48,000 yr
Orbital- and sub-orbital-scale climate impacts on vegetation of the western Mediterranean basin over the last 48,000 yr
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DOI：
10.1016/j.yqres.2008.07.002
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发表时间：
2008-11-01
影响因子：
2.3
通讯作者：
Goni, Maria Fernanda Sanchez
中科院分区：
文献类型：
--
作者：
Fletcher, William J.;Goni, Maria Fernanda Sanchez
Alboran Sea Core MD95-2043的高分辨率花粉分析提供了48 ka的连续植被记录，可以直接与海面和深水变化相关。与Padul（西班牙内华达山脉）的记录相比，这一记录的可靠性得到了支持。海洋同位素阶段（MIS） 3的特征是栎森林覆盖对Dansgaard-Oeschger气候变率的响应。MIS 2以半荒漠植被为主。尽管MIS 2总体上处于干燥和寒冷状态，但Heinrich事件（HEs） 2和HEs 1与末次极大期相比在强度和条件上有所不同。研究了不同分类群的植被对气候结构的响应。在MIS 1中，Bolling-Allerod以快速造林为标志，而在新仙女木时期发生了半沙漠环境的重新扩张。混合栎林在11.7 ~ 5.4 cal ka BP之间达到最大值，5.4 cal ka BP以后林木数量下降。在轨道时间尺度上，半荒漠植被从MIS 3向MIS 2的长期扩展反映了全球冰量趋势，而全新世树木减少反映了夏季日照减少。此外，还检测了岁差对森林发育幅度和植被组成的影响。(C) 2008年华盛顿大学。版权所有
High-resolution pollen analysis of Alboran Sea Core MD95-2043 provides a 48-ka continuous vegetation record that can be directly correlated with sea surface and deep-water changes. The reliability of this record is supported by comparison with that of Padul (Sierra Nevada, Spain). Marine Isotope Stage (MIS) 3 was characterised by fluctuations in Quercus forest cover in response to Dansgaard-Oeschger climate variability. MIS 2 was characterised by the dominance of semi-desert vegetation. Despite overall dry and cold conditions during MIS 2, Heinrich events (HEs) 2 and 1 were distinguished from the last glacial maximum by more intensely and conditions. Taxon-specific vegetation responses to a tripartite climatic structure within the HEs are observed. In MIS 1, the Bolling-Allerod was marked by rapid afforestation, while a re-expansion of semi-desert environments occurred during the Younger Dryas. The maximum development of mixed Quercus forest occurred between 11.7 and 5.4 cal ka BP, with forest decline since 5.4 cal ka BP. On orbital timescales, a long-term expansion of semi-desert vegetation from MIS 3 into MIS 2 reflects global ice-volume trends, while Holocene arboreal decline reflects summer insolation decrease. The influence of precession on the amplitude of forest development and vegetation composition is also detected. (C) 2008 University of Washington. All rights reserved