气候变化领域集成服务门户(CCPortal): Borehole Diameter Controls Thermal-Induced Convection and Evaporation From a Shallow Water Table

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DOI	10.1029/2020GL089411
	Borehole Diameter Controls Thermal-Induced Convection and Evaporation From a Shallow Water Table
	Levintal E.; Dragila M.I.; Lensky N.G.; Weisbrod N.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:18
英文摘要	Understanding air exchange via boreholes, shafts, and wells is important for Earth and environmental sciences because of their potential role for increased evaporation and greenhouse gas emissions. Here, we investigated the effect of atmospheric temperature variability on air transport via a borehole as a function of its diameter. Field experiment included five boreholes with diameters ranging from 0.10 to 0.38 m and a depth of 3 m with an artificial water table at −2.7 m. Temperature was recorded in each borehole at 1-min intervals for 1 year. Diurnal and seasonal air temperature changes triggered thermal instability, mainly during winter nights, which initiated thermal-induced convection within the boreholes. The thermal-induced convection penetrated deeper into the borehole as the diameter increased, doubling the water table evaporation rate for the largest borehole relative to the smallest. Borehole diameter plays an important role in controlling air exchange rates between the subsurface and the atmosphere. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Air; Atmospheric movements; Atmospheric temperature; Evaporation; Gas emissions; Greenhouse gases; Groundwater; Heat convection; Thermodynamic stability; Air exchange rates; Air temperature changes; Artificial water; Diameter control; Environmental science; Induced convections; Shallow water tables; Thermal instabilities; Boreholes; air temperature; borehole geophysics; convection; diameter; evaporation; induced response; shallow water; water table; water temperature
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/169686
作者单位	Department of Environmental Hydrology and Microbiology, The Zuckerberg Institute for Water Research, The Jacob Blaustein Institutes for Desert Research, Ben-Gurion University of the Negev, Beersheba, Israel; Department of Crop and Soil Science, Oregon State University, Corvallis, OR, United States; Geological Survey of Israel, Jerusalem, Israel
推荐引用方式 GB/T 7714	Levintal E.,Dragila M.I.,Lensky N.G.,et al. Borehole Diameter Controls Thermal-Induced Convection and Evaporation From a Shallow Water Table[J],2020,47(18).
APA	Levintal E.,Dragila M.I.,Lensky N.G.,&Weisbrod N..(2020).Borehole Diameter Controls Thermal-Induced Convection and Evaporation From a Shallow Water Table.Geophysical Research Letters,47(18).
MLA	Levintal E.,et al."Borehole Diameter Controls Thermal-Induced Convection and Evaporation From a Shallow Water Table".Geophysical Research Letters 47.18(2020).