Effects of Short-Term Climate Variations on Young Water Fraction in a Small Pre-Alpine Catchment

IF 4.6 1区 地球科学 Q2 ENVIRONMENTAL SCIENCES Water Resources Research Pub Date : 2024-10-16 DOI:10.1029/2023wr036245
C. Xia, G. Zuecco, C. Marchina, D. Penna, M. Borga
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Abstract

Continuous and extended observations of hydrometeorological parameters, alongside the analysis of the isotopic composition across diverse waters within catchments, can significantly enhance our understanding of the potential ramifications of climate change on the hydrological response. In this study, a comprehensive analysis of hydrometeorological and isotopic data was conducted over 10 hydrological years (October 2012–September 2022) within a small, forested catchment in the Italian pre-Alps, aiming to investigate the impacts of short-term climatic changes on the isotopic composition of waters and the young water fraction (Fyw). The results showed that the catchment experienced climate conditions with rapid warming and drying trends. Significant isotopic enrichments were observed in all sampled water sources, driven primarily by air temperature. Fyw was estimated to be 0.64 ± 0.06, 0.45 ± 0.07, and 0.16 ± 0.03 for stream water, soil water, and shallow groundwater based on the whole-period sinusoidal fittings, respectively. Comparative analyses comprising different approaches for the estimation of Fyw showed that time-windows scenarios and detrending corrections yielded smaller Fyw than approaches based on the whole-period fitting and discharge-sensitivity modeling. Such differences can be attributed to an uneven temporal distribution of stream water isotopic data, the difficulties in capturing high flows in a humid catchment characterized by a fast runoff response during rainfall-runoff events, and the presence of isotopic trends. Our findings underscore the imperative of integrating interannual isotopic trends and adopting appropriate sampling strategy and methodological approaches to ensure a robust Fyw estimation.
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短期气候变化对阿尔卑斯山前小流域幼年水比例的影响
对水文气象参数进行连续、长时间的观测,同时对集水区内不同水域的同位素组成进行分析,可以大大提高我们对气候变化对水文响应的潜在影响的认识。在这项研究中,我们对意大利阿尔卑斯山山前地区一个小型森林集水区 10 个水文年(2012 年 10 月至 2022 年 9 月)的水文气象和同位素数据进行了综合分析,旨在研究短期气候变化对水体同位素组成和幼水部分(Fyw)的影响。结果表明,该流域的气候条件呈现快速变暖和干燥的趋势。在所有取样水源中都观察到了明显的同位素富集现象,这主要是受气温的影响。根据全周期正弦拟合,估计溪水、土壤水和浅层地下水的 Fyw 分别为 0.64 ± 0.06、0.45 ± 0.07 和 0.16 ± 0.03。对不同的 Fyw 估算方法进行的比较分析表明,时间窗方案和去趋势校正所产生的 Fyw 小于基于全周期拟合和排放敏感性建模的方法。这种差异可归因于溪流水同位素数据的时间分布不均、在降雨-径流事件中难以捕捉潮湿集水区的大流量(其特点是径流响应快)以及同位素趋势的存在。我们的研究结果表明,必须综合考虑年际同位素趋势,并采用适当的采样策略和方法,以确保可靠的 Fyw 估算。
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来源期刊
Water Resources Research
Water Resources Research 环境科学-湖沼学
CiteScore
8.80
自引率
13.00%
发文量
599
审稿时长
3.5 months
期刊介绍: Water Resources Research (WRR) is an interdisciplinary journal that focuses on hydrology and water resources. It publishes original research in the natural and social sciences of water. It emphasizes the role of water in the Earth system, including physical, chemical, biological, and ecological processes in water resources research and management, including social, policy, and public health implications. It encompasses observational, experimental, theoretical, analytical, numerical, and data-driven approaches that advance the science of water and its management. Submissions are evaluated for their novelty, accuracy, significance, and broader implications of the findings.
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