Effects of seasonal and interannual variability in water isotopes (δ2H, δ18O) on estimates of water balance in a chain of seven prairie lakes

IF 3.1 Q2 GEOSCIENCES, MULTIDISCIPLINARY
H.A. Haig , N.M. Hayes , G.L. Simpson , Y. Yi , B. Wissel , K.R. Hodder , P.R. Leavitt
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引用次数: 5

Abstract

Stable isotopes of hydrogen (δ2H) and oxygen (δ18O) provide important quantitative measures of lake hydrology and water balance, particularly in lakes where monitoring of fluxes is incomplete. However, little is known of the relative effects of seasonal variation in water isotopes on estimates of lake hydrology, particularly over decadal scales. To address this gap, we measured water isotopes bi-weekly May-September during 2003–2016 in seven riverine lakes within the 52,000 km2 Qu’Appelle River drainage basin of the Canadian Prairies. Analyses revealed that within-year variation in δ18O values routinely exceeded that among years, reflecting rapid changes in water source, particularly in lakes with water residence times <1 year. Isotopic variation was greatest during spring following snowmelt, except in large deep lakes which exhibited limited differences among seasons or years. In contrast, large hydrological events (e.g., 1-in-140-year flood in 2011) homogenized isotopic values, even among riverine lakes separated by over 150 km, and exerted particularly strong legacy effects on large lakes. Overall, study lakes exhibited a strongly positive moisture balance (evaporation < inflow), despite regional precipitation deficits of 30 cm yr−1, with greater reliance on rainfall (vs. snow) and possibly evaporation in downstream lakes within more humid regions. We conclude that seasonal samples of water isotopes are required to characterize the hydrology of shallow lakes, or those with unknown reliance on snowmelt waters, as well as to better quantify lake susceptibility to climate variability.

水同位素(δ2H,δ18O)的季节和年际变化对七个草原湖泊水平衡估计的影响
氢(δ2H)和氧(δ18O)的稳定同位素提供了湖泊水文和水平衡的重要定量测量,特别是在通量监测不完整的湖泊中。然而,人们对水同位素的季节变化对湖泊水文估算的相对影响知之甚少,特别是在年代际尺度上。为了解决这一差距,我们在2003年至2016年期间每两周测量5月至9月的七个河流湖泊的水同位素,这些湖泊位于加拿大大草原的52,000平方公里的Qu 'Appelle河流域。分析表明,δ18O值的年内变化通常大于年际变化,反映了水源的快速变化,特别是在水停留时间为1年的湖泊。除大型深湖在季节或年份之间表现出有限差异外,春季融雪后同位素变化最大。相比之下,大型水文事件(如2011年140年一遇的洪水)使同位素值均匀化,即使在相隔150公里以上的河流湖泊中也是如此,并对大型湖泊产生了特别强烈的遗留效应。总体而言,研究湖泊表现出强烈的正水分平衡(蒸发<流入),尽管区域降水不足30厘米年−1,更大程度上依赖于降雨(相对于雪),并可能在更潮湿地区的下游湖泊蒸发。我们的结论是,需要季节性的水同位素样本来表征浅湖的水文特征,或者那些未知依赖融雪水的湖泊,以及更好地量化湖泊对气候变率的敏感性。
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来源期刊
Journal of Hydrology X
Journal of Hydrology X Environmental Science-Water Science and Technology
CiteScore
7.00
自引率
2.50%
发文量
20
审稿时长
25 weeks
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