Dynamics of reactive and inert gases in soil air and groundwater in the context of thedetermination of noble gas temperatures

测定稀有气体温度时土壤空气和地下水中活性气体和惰性气体的动态

• 批准号: 242597424
• 负责人: Professor Dr. Werner Aeschbach
• 金额: --
• 依托单位: Instituto de Geociências
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2013
• 资助国家: 德国
• 起止时间: 2012-12-31 至 2016-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/242597424?language=en
• 关键词: Dynamics; reactive; inert; gases; soil

Dissolved (noble) gases in groundwater are established tracers for dating as well as reconstruction of climate conditions in the past. Noble gas studies of recent years have shown that a better understanding of the processes that determine gas contents during groundwater recharge is necessary - especially with regard to the use of noble gases in groundwater in paleoclimate research. Hence, in this study, the importance of reactive gas processes in the subsurface under various hydrogeological and climatic conditions shall be studied empirically as well as with the help of modeling. To derive as general as possible conclusions, the project comprises the installation and subsequent sampling of a total of 4 test sites. A detailed understanding of the interaction between the unsaturated and saturated soil zone requires the collection of a broad range of physical and chemical parameters. Two of the test sites shall serve the long-term observation of the gas composition of soil air and groundwater. A further test site shall in the first place enable the investigation of the so far hardly systematically studied phenomenon of groundwater degassing. Finally, the fourth test site shall be installed in a tropical climate region, in order to investigate the effect of enhanced precipitation and biological activity in the soil.The systematically collected data shall in the first place enable an assessment of the applicability and if appropriate an extension of currently discussed models for the noble gas concentrations in groundwaters. These models are of fundamental significance for the method of noble gas thermometry, but also important for the application of gas tracers for groundwater dating. Beyond this field of application, the results of this study are important for a better understanding of the gas-related biogeochemical and physical processes in the subsurface. Hence the study is related to a wide research field of practical relevance, especially with regard to gas reactions and transport at contaminated sites and during remediation measures.

地下水中的溶解（惰性）气体是确定年代和重建过去气候条件的示踪剂。近年来的惰性气体研究表明，有必要更好地了解地下水补给期间确定气体含量的过程，特别是在古气候研究中使用地下水中的惰性气体。因此，在这项研究中，在各种水文地质和气候条件下的地下活性气体过程的重要性，应研究经验，以及与建模的帮助。为了得出尽可能普遍的结论，该项目包括安装和随后的采样，共4个测试地点。详细了解非饱和和饱和土壤区之间的相互作用需要收集广泛的物理和化学参数。其中两个试验场应用于长期观测土壤、空气和地下水的气体成分。另外的试验场应首先能够调查迄今为止几乎没有系统研究的地下水脱气现象。最后，第四个试验场应设在热带气候区，以便调查降水量增加和土壤中生物活动的影响，系统收集的数据应首先能够评估目前讨论的地下水中惰性气体浓度模型的适用性，并酌情加以推广。这些模型不仅对惰性气体测温方法具有重要的基础意义，而且对气体示踪剂在地下水定年中的应用也具有重要意义。除了这一应用领域之外，这项研究的结果对于更好地理解地下与气体相关的地球化学和物理过程非常重要。因此，这项研究涉及到一个广泛的研究领域的实际意义，特别是关于气体的反应和运输在污染场地和补救措施。