A 17000-year history of Andean climate and vegetation change from Laguna de Chochos, Peru
A 17000-year history of Andean climate and vegetation change from Laguna de Chochos, Peru
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DOI：
10.1002/jqs.983
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发表时间：
2005-10-01
影响因子：
2.3
通讯作者：
Gosling, WD
中科院分区：
文献类型：
--
作者：
Bush, MB;Hansen, BCS;Gosling, WD
主要气候事件的表现，如冰川消融的时间，以及年轻的仙女木是否影响了安第斯系统，最近引起了相当大的关注。甚至全新世也正在迅速崛起，成为新热带古气候学和古生态学研究的重要时期。新热带地区的全新世现在被认为是一个随着降水发生某种温度变化的时期：蒸发率波动很大。湖泊水位、冰层积聚和植被的重大变化表明降水和温度制度的变化，尽管全球范围的强迫机制可能是其中一些变化的基础，例如岁差节奏，其他变化似乎是局部性的。在秘鲁安第斯山脉东部森林上限附近的一份记录中，花粉、木炭和沉积数据表明，从大约17000卡到大约11500卡的消冰期。YR BP是一个气候快速振荡的时期，与气候变暖的总体趋势相反。在约9500至约7300卡之间有明显的暖干事件。YR BP，并与其他地区档案进行比较，表明它的规模是地区性的。磁化率数据在12000-6000年之间有明显的约1500年的周期性，在城市事件期间达到峰值强度。全新世的大部分地区都存在着500-600年周期的较弱的振荡。最上面的花粉分析样本显示，随着现代人类土地利用简化了景观，森林遭到砍伐。版权所有(C)2005 John Wiley&Sons，Ltd.
The manifestation of major climatic events such as the timing of deglaciation and whether, or not, the Younger Dryas affected Andean systems has garnered considerable recent attention. Even the Holocene is rapidly emerging as a time of considerable interest in Neotropical palaeoclimatology and palaeoecology. The Holocene of the Neotropics is now revealed as a time of some temperature change with precipitation:evaporation ratios fluctuating markedly. Major changes in lake level, ice-accumulation, and vegetation are indicative of changes both in precipitation and temperature regimes, Although global-scale forcing mechanisms may Underlie some of these changes, e.g. the precessional rhythm, other variability appears to be localised. In a record from near the Upper forest limit of the eastern Peruvian Andes, pollen, charcoal, and sedimentary data suggest that the deglaciational period from ca. 17 000 to ca. 11 500 cal. yr BP was a period of rapid climatic oscillations, set against an overall trend of warming. A warm-dry event is evident between ca. 9500 and ca. 7300 cal. yr BP, and comparisons with other regional archives suggest that it was regional in scale. A ca. 1500-yr periodicity in the magnetic susceptibility data is evident between 12000 and 6000 cal.yr BP, reaching a peak intensity during the city event. A weaker oscillation with a 500-600-yr periodicity is present throughout much of the Holocene. The Uppermost sample of the pollen analysis reveals deforestation as modern human land Use simplified the landscape. Copyright (C) 2005 John Wiley & Sons, Ltd.