Millennial to orbital-scale variations of drought intensity in the Eastern Mediterranean
Millennial to orbital-scale variations of drought intensity in the Eastern Mediterranean
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DOI：
10.1016/j.quascirev.2015.12.016
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发表时间：
2016-02
影响因子：
4
通讯作者：
M. Stockhecke;A. Timmermann;R. Kipfer;G. Haug;O. Kwiecien;T. Friedrich;L. Menviel;T. Litt;N. Pic
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文献类型：
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作者：
M. Stockhecke;A. Timmermann;R. Kipfer;G. Haug;O. Kwiecien;T. Friedrich;L. Menviel;T. Litt;N. Pic
地中海区域千年至轨道尺度的降雨量变化以及相应的植被模式变化是大规模大气重组的结果。尽管最近努力使用一系列代理档案来重建这种可变性，但潜在的物理机制仍然难以捉摸。通过对土耳其凡湖一个新的高分辨率沉积剖面的分析以及气候模拟实验，我们确定了过去四个冰川周期地中海东部的大规模干旱，这些干旱与已知的北大西洋冰山崩解增强、较弱的大西洋经向翻转环流和Dansgaard-Oeschger寒冷条件有普遍的联系。在轨道时间尺度上，北半球大冰盖和日照季节最少的时段的地形效应抑制了夏季和冬季降水，进一步加剧了干旱强度。
Millennial to orbital-scale rainfall changes in the Mediterranean region and corresponding variations in vegetation patterns were the result of large-scale atmospheric reorganizations. In spite of recent efforts to reconstruct this variability using a range of proxy archives, the underlying physical mechanisms have remained elusive. Through the analysis of a new high-resolution sedimentary section from Lake Van (Turkey) along with climate modeling experiments, we identify massive droughts in the Eastern Mediterranean for the past four glacial cycles, which have a pervasive link with known intervals of enhanced North Atlantic glacial iceberg calving, weaker Atlantic Meridional Overturning Circulation and Dansgaard-Oeschger cold conditions. On orbital timescales, the topographic effect of large Northern Hemisphere ice sheets and periods with minimum insolation seasonality further exacerbated drought intensities by suppressing both summer and winter precipitation.