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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >The effect of the negative pressure of capillary water on atmospheric noble gas solubility in ground water and palaeotemperature reconstruction
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The effect of the negative pressure of capillary water on atmospheric noble gas solubility in ground water and palaeotemperature reconstruction

机译：毛细管水的负压对大气中稀有气体在地下水中的溶解度和古温度重建的影响

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摘要

Atmospheric-derived noble gases He, Ne, Ar, Kr and Xe dissolved in ground waters record the temperature at the moment of their recharge. Palaeotemperature reconstructions should include all the parameters affecting the soil air-ground water thermodynamic equilibrium. Particularly, the occurrence of excess air, that is ANG in excess compared to the equilibrium concentrations and often mass-fractionated compared to the atmospheric pattern, is likely produced by air entrapment during water infiltration in the nonsaturated zone (NSZ). Here, we show that water persisting in the NSZ has peculiar capillary properties controlled by the internal water pressure, which decreases (even down to negative pressures) with decreasing soil-air humidity. Decreasing water pressure induces mass-dependent increasing solubility of ANG from He to Xe. In addition, in nonsaturated soils where water and air coexist, air entrapment is favored allowing nonfractionated excess air. This capillary approach has been coded in an inverse-method program called Thermo_Inver, and tested on two well-characterized noble gas datasets used to constrain palaeotemperatures in Midwestern United States and Brazil during the last glacial maximum [Quat. Res. 43 (1995) 209; Science 269 (1995) 379]. Results of these simulations highlight that under suitable climatic conditions and in fine-porous media, the capillary pressure of water may be a prominent parameter controlling the addition of ANG to ground waters. Under these conditions, the recharge zone for ANG is the NZS and this water-air coexistence zone easily produces excess air.
机译：溶解在地下水中的来自大气的稀有气体He，Ne，Ar，Kr和Xe记录了它们补充时的温度。古温度重建应包括影响土壤空气-地下水热力学平衡的所有参数。特别是，非饱和区（NSZ）中水渗透过程中的空气夹带可能会产生过量空气，即与平衡浓度相比ANG过量，并且通常与大气模式相比质量分数大。在这里，我们表明，滞留在NSZ中的水具有受内部水压控制的特殊毛细特性，随着土壤空气湿度的降低，内部水压会降低（甚至降低至负压）。水压的降低引起ANG从He到Xe的质量依赖性增加。另外，在水和空气共存的非饱和土壤中，空气截留有利于产生不分馏的过量空气。这种毛细管方法已在名为Thermo_Inver的反方法程序中进行了编码，并在最后一次冰川最大时期用于限制美国中西部和巴西古温度的两个特征充分的稀有气体数据集进行了测试[Quat。 Res。 43（1995）209; Science 269（1995）379]。这些模拟的结果表明，在合适的气候条件下和在微孔介质中，水的毛细压力可能是控制向地下水中添加ANG的重要参数。在这些条件下，ANG的补给区为NZS，该水-空气共存区很容易产生过量的空气。

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