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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 >Triple oxygen and hydrogen isotopes of gypsum hydration water for quantitative paleo-humidity reconstruction
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Triple oxygen and hydrogen isotopes of gypsum hydration water for quantitative paleo-humidity reconstruction

机译：用于定量古湿度重建的石膏水合水三倍氧和氢同位素

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Atmospheric relative humidity is an important parameter affecting vegetation yet paleo-humidity proxies are scarce and difficult to calibrate. Here we use triple oxygen (delta O-17 and O-18) and hydrogen (delta D) isotopes of structurally -bound gypsum hydration water (GHW) extracted from lacustrine gypsum to quantify past changes in atmospheric relative humidity. An evaporation isotope-mass-balance model is used together with Monte Carlo simulations to determine the range of climatological conditions that simultaneously satisfy the stable isotope results of GHW, and with statistically robust estimates of uncertainty. We apply this method to reconstruct the isotopic composition of paleo-waters of Lake Estanya (NE Spain) and changes in normalized atmospheric relative humidity (RH.) over the last glacial termination and Holocene (from similar to 15 to 0.6 cal. kyrs BP). The isotopic record indicates the driest conditions occurred during the Younger Dryas (YD; similar to 12-13 cal. kyrs BP). We estimate a RHQ of similar to 40-45% during the YD, which is similar to 30-35% lower than today. Because of the southward displacement of the Polar Front to similar to 42 degrees N, it was both windier and drier during the YD than the Belling-Allered period and Holocene. Mean atmospheric moisture gradually increased from the Preboreal to Early Holocene (similar to 11 to 8 cal. kyrs BP, 50-60%), reaching 70-75% RH. from similar to 7.5 cal. kyrs BP until present-day. We demonstrate that combining hydrogen and triple oxygen isotopes in GHW provides a powerful tool for quantitative estimates of past changes in relative humidity. (C) 2017 Elsevier B.V. All rights reserved.
机译：大气相对湿度是影响植被的重要参数，但古湿度代理稀缺且难以校准。在这里，我们使用从湖泊石膏中提取的结构 - 基于石膏水合水（GHW）的三重氧（Delta O-17和O-18）和氢气（Delta d）同位素，以量化大气相对湿度的过去变化。蒸发同位素 - 质量平衡模型与蒙特卡罗模拟一起使用，以确定同时满足GHW的稳定同位素结果的气候病症范围，以及具有统计学上的不确定性估算。我们应用这种方法来重建艾伦塔湖（NE西班牙）的古水的同位素组成，并在最后冰川终端和全新世（类似于15至0.6 Cal）上的归一化大气相对湿度（RH。）的变化。kyrs bp） 。同位素记录表明，在较年轻的Dratos（YD;类似于12-13克拉的情况下发生了最干燥的病症。Kyrs BP）。在YD期间，我们估计类似于40-45％的RHQ，这与今天的30-35％相似。由于南方位移到极性前沿与42度相似，因此在YD期间卷扬机和干燥器比Belling-Blosered时期和全新世。意味着大气水分从妊娠到早期全新世（类似于11至8次Cal.Kyrs BP，50-60％），达到70-75％RH。从类似于7.5 cal。 Kyrs BP直到当今。我们证明了GHW中的氢和三重氧同位素的组合提供了一种强大的工具，用于对相对湿度的过去变化的定量估计。 （c）2017年Elsevier B.V.保留所有权利。

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