在两个干旱的盆地中,由山区分开的二氧化硫同位素签名形成对比
Yuxin Hao1,2,3, Shijiao Niu1,2,3, Haixia Zhu4,5
1College of Urban and Environmental Sciences, Northwest University, Xi'an, 710127, China.
Scientific reports
|May 18, 2025
概括
干旱地区的盐湖有助于沙尘暴. 这项研究比较了卡伊达姆盆地和阿尔克萨高原的硫同位素和离子组成,揭示了不同的环境条件和影响尘暴材料的硫源.
科学领域:
- 地质化学 地质化学
- 环境科学 环境科学
- 同位素水文学 同位素水文学
背景情况:
- 由于气候变化,干旱地区的盐湖和海越来越多地成为尘暴的重要来源.
- 这些尘暴会影响大气循环和气候动态.
- 了解这些尘暴的来源材料对于气候建模至关重要.
研究的目的:
- 为了比较来自Qaidam盆地和Alxa高原的表面盐的离子组成和硫同位素特性.
- 调查这两个不同的干旱地区对比的硫源和环境条件.
- 阐明控制盐粉的物质来源和进化过程的因素.
主要方法:
- 从Qaidam盆地和Alxa高原收集表面盐样本.
- 对主要离子组成 (Na+,Cl-, Mg2+,SO42-) 的分析.
- 确定硫同位素比例 (δ34S) 和硫与 (S/Cl) 的比例.
主要成果:
- 这两个地区都有较高的Na+和Cl-度,Mg2+和SO42-也存在.
- 卡伊达姆盆地显示较高,聚类的 δ34S 值 (+9.11 ‰ 到 +20.23 ‰),表明是一个封闭系统.
- 阿尔克萨高原显示了更多可变的 δ34S 值 (-2.30 ‰ 到 +11.43 ‰),表明开放系统条件和多样化的硫输入,进一步得到了不同的 S/Cl 比率的支持.
结论:
- 卡伊达姆盆地和阿尔克萨高原对比的硫同位素和离子比率反映了不同的环境过程和硫来源.
- 卡伊达姆盆地的硫循环似乎是一个相对封闭的系统,而阿尔克萨高原表现出更复杂的开放系统特征.
- 这些发现为来自干旱环境的盐尘材料的来源和演变提供了关键的见解.
更多相关视频
09:41Isolation of Quartz Grains for Optically Stimulated Luminescence OSL Dating of Quaternary Sediments for Paleoenvironmental Research
Published on: August 2, 2021
2.7K
06:51Quantitative Analysis by Thermogravimetry-Mass Spectrum Analysis for Reactions with Evolved Gases
Published on: October 29, 2018
9.3K
相关概念视频
Mass Spectrometry: Isotope Effect
1.9K
Most elements exist in nature as a mixture of isotopes. The isotopes differ in weight due to their respective number of neutrons. The molecular weight of a molecule is different depending on the specific isotope of its elements involved. As a result, the mass spectrum of the molecule exhibits peaks from the same fragment at multiple positions. The positions of these mass signals depend on the difference between the molecular mass. Furthermore, the intensity of these signals is dependent on the...
1.9K
The Sulfur Cycle
43.5K
Sulfur, an important element in the chemical makeup of proteins, is recycled through the atmosphere and aquatic and terrestrial environments. Found in the atmosphere as sulfur dioxide (SO2), sulfur is released by decaying organisms, weathered rocks, geothermal vents, volcanos, and burning fossil fuels. It is deposited into the ecosystem, cycled through the biotic community, and either released back into the atmosphere as gas or deposited in marine sediment for long-term storage and eventual...
43.5K
Global Climate Change
24.0K
Throughout its ~4.5 billion year history, the Earth has experienced periods of warming and cooling. However, the current drastic increase in global temperatures is well outside of the Earth’s cyclic norms, and evidence for human-caused global climate change is compelling. Paleoclimatology, the study of ancient climate conditions, provides ample evidence for human-caused global climate change by comparing recent conditions with those in the past.
24.0K
Precipitation and Co-precipitation
1.6K
Precipitation and coprecipitation methods can be used to separate a mixture of ions in a solution. In qualitative inorganic analysis, ions that form sparingly soluble precipitates with the same reagent are separated based on the differences in solubility products. For example, consider the separation of Cu(II) and Fe(II) ions by precipitation as insoluble sulfides. First, copper(II) sulfide is precipitated by the addition of acidic H2S, where the dissociation of H2S is suppressed. Adding H2S...
1.6K
¹³C NMR: ¹H–¹³C Decoupling
992
The probability of having two carbon-13 atoms next to each other is negligible because of the low natural abundance of carbon-13. Consequently, peak splitting due to carbon-carbon spin-spin coupling is not observed in spectra. However, protons up to three sigma bonds away split the carbon signal according to the n+1 rule, resulting in complicated spectra.
A broadband decoupling technique is used to simplify these complex, sometimes overlapping, signals. Broadband decoupling relies on a...
A broadband decoupling technique is used to simplify these complex, sometimes overlapping, signals. Broadband decoupling relies on a...
992
Mass Spectrometry: Alkyl Halide Fragmentation
983
Chlorine isotopes exist as 35Cl and 37Cl in a 3:1 ratio, while bromine isotopes exist as 79Br and 81Br in a 1:1 ratio. The mass spectrum of alkyl halides typically produces two distinct molecular ion peaks, the molecular ion peak, [M], and the molecular ion plus two, [M + 2] peak. The relative heights of these two peaks are proportional to the isotopic abundance ratios of the halide. For example, 2‐chloropropane and 1‐bromopropane display two peaks with relative peak heights in a 3:1 and...
983
