Environmental control on Mediterranean salinity and δ18O
Environmental control on Mediterranean salinity and δ18O
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对地中海盐度和 δ18O 的环境控制
DOI：
10.1029/1999pa900042
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发表时间：
1999
期刊：
影响因子：
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通讯作者：
E. Rohling
中科院分区：
文献类型：
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作者：
E. Rohling
本文提出了一个箱形模式来模拟过去2万年来地中海长期平均盐度和δ 18 O的变化。通过与观测值的比较验证了模拟结果。敏感性测试说明了主要假设和不确定性的稳健性。结果表明，相对湿度在地中海保持相对恒定的70%左右，显然狭窄的限制到较低的范围内观察到的全球海洋表面的盆地的内陆特征。相对于现在，径流中的同位素耗竭被认为是地中海δ 18 O记录耗竭的主要潜在原因。此外，相对湿度的轻微增加（约5%）可能会导致非常明显的同位素耗尽，如在腐泥S5的倒数第二次间冰期最大。该模型显示出δ18O和盐度对环境变化的明显非比例响应，这与同位素残差在地中海古盐度重建中的应用提出了异议。
A box model is presented to simulate changes in Mediterranean long-term average salinity and δ18O over the past 20,000 years. Simulations are validated by comparison with observations. Sensitivity tests illustrate robustness with respect to the main assumptions and uncertainties. The results show that relative humidity over the Mediterranean remained relatively constant around 70%, apparently narrowly constrained to the lower end of the range observed globally over sea surfaces by the basin's land-locked character. Isotopic depletion in run off, relative to the present, is identified as the main potential cause of depletions in the Mediterranean δ18O record. Also, slight increases in relative humidity (of the order of 5%) might have caused very pronounced isotopic depletions, such as that in sapropel S5 of the penultimate interglacial maximum. The model shows distinctly non proportional responses of δ18O and salinity to environmental change, which argues against the use of isotope residuals in Mediterranean paleosalinity reconstructions.