Seasonal variations of halite saturation in the Dead Sea
Seasonal variations of halite saturation in the Dead Sea
复制标题
死海石盐饱和度的季节变化
DOI：
10.1002/2016wr018974
复制
发表时间：
2016
影响因子：
5.4
通讯作者：
N. Lensky
中科院分区：
文献类型：
--
作者：
I. Sirota;A. Arnon;N. Lensky
在过去，高盐度的湖泊和海洋很常见，沉积了厚厚的蒸发盐类沉积物。现代唯一一种对深层饱和盐分的水环境进行古矿物学研究的类似物存在于死海。在这项研究中，我们提出了来自死海的关于季节性温盐层结和水平衡对盐岩(盐)饱和度和沿水柱的盐岩生长速率的季节和深度变化的作用的新见解。我们开发了基于高精度密度测量的方法来准确确定湖泊的盐岩饱和度，并量化沿水柱的盐岩生长速率。夏季，表层水不饱和，盐岩被溶解，而冬季整个水柱过饱和，形成盐岩。这一结果并不是微不足道的，因为水平衡的变化表明相反的情况；与冬季相比，夏季与湖泊蒸发损失的水分更多相关。因此，热效应克服了水文平衡效应，从而控制了季节性饱和循环。亚离子相对于盐岩是过饱和的，全年都有结晶，冬季的过饱和度和结晶速率较高。在夏季，相反的环境同时共存--溶解岩盐的不饱和岩浆和结晶岩盐的过饱和岩浆，导致蒸发东洋盆地深部的岩盐矿床集中，使浅层岩盐矿床变薄。
Hypersaline lakes and seas were common in the past, precipitating thick evaporitic salt deposits. The only modern analogue for the paleolimnology of deep salt‐saturated aquatic environments exists in the Dead Sea. In this study, we present new insights from the Dead Sea on the role of seasonal thermohaline stratification and water balance on the seasonal and depth variations of the degree of saturation of halite (salt) and the rate of halite growth along the water column. We developed methodologies to accurately determine the empirical degree of halite saturation of the lake based on high accuracy densitometry, and to quantify halite growth rate along the water column. During summer, the epilimnion is undersaturated and halite is dissolved, whereas during winter the entire water column is supersaturated and crystallizes halite. This result is not trivial because the variations in the water balance suggest the opposite; summer is associated with higher loss of water by evaporation from the lake compared to the winter. Hence, the thermal effect overcomes the hydrological balance effect and thus governs the seasonal saturation cycle. The hypolimnion is supersaturated with respect to halite and crystallizes throughout the year, with higher super saturation and higher crystallization rates during winter. During summer, simultaneous opposing environments coexist—an undersaturated epilimnion that dissolves halite and a supersaturated hypolimnion that crystallizes halite, which results in focusing of halite deposits in the deep hypolimnetic parts of the evaporitic basins and thinning the shallow epilimnetic deposits.
来自死海深部沉积物微相分析的黎凡特末次冰期早期（～ 117â75 ka）期间的水文气候变化
影响因子：
4.3
作者：
Neugebauer;Schwab;Waldmann;Tjallingii;Hadzhiivanova;Naumann;A. Brauer
通讯作者：
A. Brauer
ICDP 死海深钻项目 (DSDDP) 恢复的长沉积物记录的岩性
影响因子：
4
作者：
Neugebauer;Brauer;Schwab;Waldmann;Kitagawa;Torfstein;Dulski;Ariztegui;Ben-Avraham;Goldstein
通讯作者：
Goldstein