Triple oxygen isotope signatures in evaporated water bodies from the Sistan Oasis, Iran
Triple oxygen isotope signatures in evaporated water bodies from the Sistan Oasis, Iran
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DOI：
10.1002/2015gl066475
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发表时间：
2015-10
影响因子：
5.2
通讯作者：
J. Surma;S. Assonov;M. Bolourchi;M. Staubwasser
中科院分区：
文献类型：
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作者：
J. Surma;S. Assonov;M. Bolourchi;M. Staubwasser
来自伊朗苏拉威西绿洲干旱和半干旱环境水体的天然样品表明，由于极端蒸发过程中的非平衡分馏，17 O-过量和δ 18 O发生了系统性演变。残留水样显示出17 O-过量的显著和系统性的减少，并逐渐蒸发损失，在δ 18 O的35‰范围内达到每微克-160的值。来自严重蒸发的体积有限的天然水体的沃茨，补给有限或没有补给，落在理论预测的同位素演化曲线上，与30 - 35%的环境相对湿度一致。补给水体似乎遵循不同的趋势。这些新的结果表明，17 O-过量在干旱环境中估计蒸发损失和环境条件的潜力。
Natural samples from water bodies in the arid and semiarid environment of the Sistan Oasis, Iran, demonstrate a systematic evolution of 17O‐excess and δ18O as a result of nonequilibrium fractionation during extreme evaporation. Residual water samples exhibit a significant and systematic decrease of 17O‐excess with progressive evaporation loss, reaching values of −160 per meg over a 35‰ range of δ18O. Waters from heavily evaporated volume‐limited natural bodies with limited or no recharge fall on the theoretically predicted isotopic evolution curve in agreement with ambient relative humidity of 30 to 35%. Recharged water bodies appear to follow a different trend. These new results demonstrate the potential of 17O‐excess for the estimation of evaporation loss and ambient conditions in an arid environment.