Quantifying the contribution of evaporation from Lake Taihu to precipitation with an isotope-based method

IF 1.1 4区 环境科学与生态学 Q4 CHEMISTRY, INORGANIC & NUCLEAR Isotopes in Environmental and Health Studies Pub Date : 2022-04-05 DOI:10.1080/10256016.2022.2056599
Yongbo Hu, W. Xiao, Jingyuan Wang, L. Welp, Chengyu Xie, H. Chu, Xuhui Lee
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引用次数: 1

Abstract

ABSTRACT Moisture recycling plays a crucial role in regional hydrological budgets. The isotopic composition of precipitation has long been considered as a good tracer to investigate moisture recycling. This study quantifies the moisture recycling fractions (f r) in the Lake Taihu region using spatial variations of deuterium excess in precipitation (d P) and surface water vapour flux (d E). Results show that d P at a site downwind of the lake was higher than that at an upwind site, indicating the influence of lake moisture recycling. Spatial variations in d P after sub-cloud evaporation corrections were 2.3, 1.4 and 3.2 ‰, and d E values were 27.4, 32.3 and 31.4 ‰ for the first winter monsoon, the summer monsoon and the second winter monsoon, respectively. Moisture recycling fractions were 0.48 ± 0.13, 0.07 ± 0.03 and 0.38 ± 0.05 for the three monsoon periods, respectively. Both using the lake parameterization kinetic fractionation factors or neglecting sub-cloud evaporation would decrease f r, and the former has a larger influence on the f r calculation. The larger f r in the winter monsoon periods was mainly caused by lower specific humidity of airmasses but comparable moisture uptake along their trajectories compared to the summer monsoon period.
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用同位素法量化太湖蒸发量对降水的贡献
摘要水分循环利用在区域水文预算中起着至关重要的作用。长期以来,降水的同位素组成一直被认为是研究水分循环的良好示踪剂。本研究利用降水中氘过量(dP)和地表水蒸气通量(dE)的空间变化来量化太湖地区的水分循环分数(fr)。结果表明,湖泊下风处的dP高于上风处,表明湖泊水分循环的影响。第一次冬季风、夏季风和第二次冬季风经云底蒸发校正后的dP空间变化分别为2.3、1.4和3.2‰,dE值分别为27.4、32.3和31.4‰。水分回收率为0.48 ± 0.130.07 ± 0.03和0.38 ± 三个季风期分别为0.05。无论是使用湖泊参数化动力学分馏因子还是忽略亚云蒸发都会降低f r,前者对f r的计算影响较大。冬季风期较大的f r主要是由于气团的比湿度较低,但与夏季风期相比,其轨迹上的吸湿量相当。
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来源期刊
CiteScore
2.80
自引率
7.70%
发文量
21
审稿时长
3.0 months
期刊介绍: Isotopes in Environmental and Health Studies provides a unique platform for stable isotope studies in geological and life sciences, with emphasis on ecology. The international journal publishes original research papers, review articles, short communications, and book reviews relating to the following topics: -variations in natural isotope abundance (isotope ecology, isotope biochemistry, isotope hydrology, isotope geology) -stable isotope tracer techniques to follow the fate of certain substances in soil, water, plants, animals and in the human body -isotope effects and tracer theory linked with mathematical modelling -isotope measurement methods and equipment with respect to environmental and health research -diagnostic stable isotope application in medicine and in health studies -environmental sources of ionizing radiation and its effects on all living matter
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