气候变化领域集成服务门户(CCPortal): Data for kinetic isotopic fractionation of water during bare soil evaporation

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DOI	https://doi.org/10.1594/PANGAEA.892812
	Data for kinetic isotopic fractionation of water during bare soil evaporation
	Quade; Maria; Brüggemann; Nicolas; Graf; Alexander; Vanderborght; Jan; Vereecken; Harry; Rothfuss; Youri
发布日期	2018-08-03
数据集类型	dataset
英文简介	The kinetic fractionation factor (αK) controls to a large extent the isotopic enrichment of surface waters during evaporation (E). In contrast to the well-known vapor-to-liquid isotopic equilibrium fractionation factor, αK has still not yet been properly characterized for soil water evaporation. In this study, we investigated the αK daily dynamics during a series of three laboratory experiments differing in soil water availability and aerodynamic conditions. For this, we applied a commonly-used isotopic evaporation model and tested it in two different approaches. First, a two-end member mixing model ("Keeling plot") was fitted to the measured isotopic composition of the laboratory air water vapor to obtain αK. In a second approach, αK was obtained from the slope of the "evaporation line" in a dual isotopic coordinate system. For both methods, the isotopic composition of the soil water was determined non-destructively and online by sampling the soil water vapor with gas-permeable microporous tubing. Results highlighted the limitation of the first approach, as the determination of the isotopic composition of E with the Keeling plot was challenging with the laboratory setup. The second approach provided αK values within the range reported in the literature and pointed to the prevalence of turbulent water vapor transport under water-saturated soil conditions, but also at soil water content significantly lower than the saturated value. In a third experiment, temporal dynamics of the atmospheric water vapor intrusion in the topmost soil layer could be observed during an isotopic labeling pulse.
语种	英语
国家	国际
学科大类	气候变化
学科子类	气候变化
文献类型	数据集
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/215223
推荐引用方式 GB/T 7714	Quade,Maria,Brüggemann,et al. Data for kinetic isotopic fractionation of water during bare soil evaporation.2018-08-03.https://doi.org/10.1594/PANGAEA.892812.