Multiproxy record for the last 4500 years from Lake Shkodra (Albania/Montenegro)

Multiproxy record for the last 4500 years from Lake Shkodra (Albania/Montenegro)
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DOI:
10.1002/jqs.2563
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发表时间:
2012-11
影响因子:
2.3
通讯作者:
G. Zanchetta;Aurélien van Welden;I. Baneschi;R. Drysdale;L. Sadori;N. Roberts;M. Giardini;C. Beck;V. Pascucci;R. Sulpizio
G. Zanchetta;Aurélien van Welden;I. Baneschi;R. Drysdale;L. Sadori;N. Roberts;M. Giardini;C. Beck;V. Pascucci;R. Sulpizio
中科院分区:
地球科学3区
文献类型:
--
作者:
G. Zanchetta;Aurélien van Welden;I. Baneschi;R. Drysdale;L. Sadori;N. Roberts;M. Giardini;C. Beck;V. Pascucci;R. Sulpizio

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提供了阿尔巴尼亚/黑山Shkodra湖最近4500卡a BP的多代理记录。岩性分析、有机碳和无机碳的C/N比和δ~(13)C表明,有机质和整体碳酸盐以自生为主。块状碳酸盐的δ18O记录表明存在两个显著的湿润时期:一个在大约4300年左右,称为BP,另一个在大约2500-2000年之间,称为BP。后一阶段也出现在西班牙南部和意大利中部,代表着地中海西部和中部的一个突出事件。在过去的2000年里,在大约1800年到1500年之间出现了四个相对潮湿的时间间隔,分别是公元150-450年、公元1350-1250年、公元1100-800年(公元850-1150年),以及公元90年左右(公元1860年)。在大约4100年和2500年之间,δ18O值相对较高,在大约4100-4000个称为BP和大约3300个称为BP的地方,有三个明显的峰值指示更干燥的条件。在1850年(约公元100年)、1400年(约公元550年)、1150年(公元800年)和约750年(公元1200年)发现了四个更干燥的事件。由于该地区的植被敏感性较差,主要受地形降雨的影响,并且海拔植被带的变化不影响湖泊集水区的花粉降雨,因此花粉记录没有显示出与这些事件相一致的变化。然而,自约公元900年以来,乔木花粉百分比和花粉浓度显著下降,表明人类活动造成了严重的森林砍伐。版权所有©2012 John Wiley&Sons,Ltd.
A multi‐proxy record is presented for approximately the last 4500 cal a BP from Lake Shkodra, Albania/Montenegro. Lithological analyses, C/N ratio and δ13C of the organic and inorganic carbon component suggest that organic matter and bulk carbonate are predominantly authigenic. The δ18O record of bulk carbonate indicates the presence of two prominent wet periods: one at ca. 4300 cal a BP and one at ca. 2500–2000 cal a BP. The latter phase is also found in southern Spain and Central Italy, and represents a prominent event in the western and central Mediterranean. In the last 2000 years, four relatively wet intervals occurred between ca. 1800 and 1500 cal a BP (150–450 AD), 1350–1250 (600–700 AD), 1100–800 (850–1150 AD), and at ca. 90 cal a BP (1860 AD). Between ca. 4100 and 2500 cal a BP δ18O values are relatively high, with three prominent peaks indicating drier conditions at ca. 4100–4000 cal a BP, ca. 3500 and at ca. 3300 cal a BP. Four additional drier events are identified at 1850 (ca. 100 AD), 1400 (ca. 550 AD), 1150 (800 AD) and ca.750 cal a BP (1200 AD). The pollen record does not show changes in accordance with these episodes owing to the poor sensitivity of vegetation in this area, which is dominated by an orographic rainfall effect and where changes in altitudinal vegetation belts do not affect the pollen rain in the lake catchment. However, since ca. 900 cal a BP a significant decrease in the percentage arboreal pollen and in pollen concentrations suggest major deforestation produced by human activities. Copyright © 2012 John Wiley & Sons, Ltd.