Quantitative reconstruction of mid‐Holocene climatic variations in the northern Alpine foreland based on Lake Morat (Swiss Plateau) and Lake Annecy (French Pre‐Alps) data
Quantitative reconstruction of mid‐Holocene climatic variations in the northern Alpine foreland based on Lake Morat (Swiss Plateau) and Lake Annecy (French Pre‐Alps) data
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基于莫拉特湖（瑞士高原）和安纳西湖（法国阿尔卑斯山麓地区）数据定量重建北部高山前陆全新世中期气候变化
DOI：
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
J. Guiot
中科院分区：
文献类型：
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作者：
M. Magny;O. Peyron;C. Bégeot;J. Guiot
来自Morat湖（瑞士）和Annecy湖（法国东部）的植被和湖泊水位数据被用来提供北方亚高山带6600-5500 cal. yr BP期间气候变量的定量估计，并测试基于现代花粉模拟的气候重建方法。从这两个站点获得的结果表明：（1）较高的湖泊水位的阶段与冷却和生长季节的缩短以及年降水量的增加相一致，（2）在气候逆转期间，夏季比冬季受到更大的影响。它们还提供了一种敏感的气候变量重建方法的证据，这种方法能够捕获微小的气候振荡，例如由微弱的湖平面波动所反映的。然而，在莫拉特湖和阿讷西湖，彼此之间的结果，并与其他网站在中欧的结果比较，也清楚地表明，无论是人为干扰的植被覆盖或过度代表性的类群，由于特定的网站博览会可能会偏向重建的气候参数的变化。除了数百年的气候振荡，莫拉特湖和阿讷西湖的记录都显示了在所考虑的时期内温度下降的总体趋势。这可能与轨道因素引起的夏季日照减少有关。最后，在莫拉特湖和阿讷西湖重建的气候参数的定量估计有助于增加我们对气候振荡对古代农业社区的可能影响的理解。
Vegetation and lake‐level data from the sites of Lake Morat (Switzerland) and Lake Annecy (eastern France) are used to provide quantitative estimates of climatic variables over the period 6600–5500 cal. yr BP in the northern Subalpine zone, and to test the method of climate reconstruction based on modern pollen analogues constrained by lake‐level data. The results obtained from both sites suggest: (1) that phases of higher lake level coincided with a cooling and a shortening of the growing season and an increase in annual precipitation, and (2) that during climatic reversals summer was more affected than winter. They also provide evidence of a sensitive method of reconstruction of climatic variables capable of capturing minor climatic oscillations such as reflected by weakly pronounced lake‐level fluctuations. However, comparison of results obtained at Lake Morat and Lake Annecy, with each other and with results from other sites in central Europe, also clearly indicates that either anthropogenic disturbances of the vegetation cover or an overrepresentation of taxa due to particular site exposition can bias the reconstruction of variations in climatic parameters. In addition to pluri‐centennial climatic oscillations, both the Lake Morat and Lake Annecy records show a general trend toward temperature cooling over the period considered. This may be related to a reduction in summer insolation induced by orbital factors. Finally, the quantitative estimates of climatic parameters reconstructed at Lake Morat and Lake Annecy help to increase our understanding of the possible impact of climatic oscillations on ancient agricultural communities.