ABSTRACT The region situated between the mountain area and the lowlands in NE Romania (East-Central Europe) is experiencing increased competition for water resources triggered by a growing population, intensification of agriculture, and industrial development. To better understand hydrological cycling processes in the region, a study was conducted using stable isotopes of water and atmospheric trajectory data to characterize regional precipitation and vapour sources derived from the Atlantic Ocean, Mediterranean and Black Seas, as well as recycled continental moisture, and to assess and partition these contributions to recharge of surface and groundwater. Atmospheric moisture in the lowlands is found to be predominantly delivered along easterly trajectories, while mountainous areas appear to be dominated by North Atlantic Ocean sources, with moisture transported along mid-latitude, westerly storm tracks. Large-scale circulation patterns affect moisture delivery, the North Atlantic Oscillation being particularly influential in winter and the East Atlantic pattern in summer. Winter precipitation is the main contributor to river discharge and aquifer recharge. As winter precipitation amounts are projected to decrease over the next decades, and water abstraction is expected to steadily increase, a general reduction in water availability is projected for the region.

中文翻译：

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基于稳定 H 和 O 同位素的水分来源调查及其在东中欧东北喀尔巴阡山脉的河流和地下水补给中的作用

摘要 由于人口增长、农业集约化和工业发展，位于罗马尼亚东北部（中东欧）山区和低地之间的地区正在经历日益激烈的水资源竞争。为了更好地了解该地区的水文循环过程，使用水的稳定同位素和大气轨迹数据进行了一项研究，以表征来自大西洋、地中海和黑海的区域降水和蒸汽源，以及循环的大陆水分，并评估和划分这些对地表水和地下水补给的贡献。发现低地的大气水分主要沿东向轨迹输送，而山区似乎主要由北大西洋来源，水分沿着中纬度西风风暴轨道输送。大规模环流模式影响水分输送，北大西洋涛动在冬季特别有影响，而在夏季则是东大西洋模式。冬季降水是河流流量和含水层补给的主要贡献者。由于未来几十年冬季降水量预计将减少，而取水量预计将稳步增加，预计该地区的可用水量将普遍减少。