Climate variability in the northern Levant from the highly resolved Qadisha record (Lebanon) during the Holocene optimum
Climate variability in the northern Levant from the highly resolved Qadisha record (Lebanon) during the Holocene optimum
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DOI：
10.1017/qua.2023.24
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发表时间：
2023-07
影响因子：
2.3
通讯作者：
C. Nehme;S. Verheyden;T. Kluge;F. Nader;R. Edwards;Hai Cheng;E. Eiche;P. Claeys
中科院分区：
文献类型：
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作者：
C. Nehme;S. Verheyden;T. Kluge;F. Nader;R. Edwards;Hai Cheng;E. Eiche;P. Claeys
黎巴嫩Qadisha洞穴新发现的石笋为黎巴嫩北方提供了高分辨率、年代较好的石笋记录。石笋在9.2 ~ 5.7ka和3.5ka时不连续生长，在~ 9.1ka时呈现负氧同位素信号，在~ 5.8ka时呈现正氧同位素信号。这种趋势反映了高海拔地区气候从湿润向干燥的变化。δ 13 C信号在整个记录中显示出快速的变化，并在全新世中期有向更负的值下降的趋势，表明土壤活动增强。在短期趋势中，Qadisha石笋记录快速干/湿变化的百年尺度上，更快速的干燥事件的趋势，对中全新世。这种变化的特点是地球化学指标和石笋生长之间的总体良好的协议，并可能受到积雪的季节性变化。Qadisha记录与其他黎凡特记录一致，显示9至7 ka的潮湿条件。7 ka后，干燥的气候似乎影响网站在低海拔和高海拔地区。与其他记录相比，Qadisha记录反映了独特的山区气候特征，特别是积雪及其持续时间调节有效渗透的影响。
Abstract New stalagmites from Qadisha Cave (Lebanon) located at 1720 m above sea level provide a high-resolution and well-dated record for northern Mount Lebanon. The stalagmites grew discontinuously from 9.2 to 5.7 and at 3.5 ka, and they show a tendency to move from a more negative oxygen isotope signal at ~9.1 ka to a more positive signal at ~5.8 ka. Such a trend reflects a change from a wetter to a drier climate at high altitudes. The δ13C signal shows rapid shifts throughout the record and a decreasing trend toward more negative values in the mid-Holocene, suggesting enhanced soil activity. In the short-term trend, Qadisha stalagmites record rapid dry/wet changes on centennial scales, with a tendency to more rapid dry events toward the mid-Holocene. Such changes are characterized by overall good agreement between both geochemical proxies and stalagmite growth and might be affected by the seasonal variations in snow cover. The Qadisha record is in good agreement with other Levantine records, showing more humid conditions from 9 to 7 ka. After 7 ka, a drier climate seems to affect sites at both low- and high-altitude areas. The Qadisha record reflects uniquely mountainous climate characteristics compared with other records, specifically the effect of snow cover and its duration regulating the effective infiltration.