DOI: 10.1029/2018JD028413
Scopus记录号: 2-s2.0-85048990961
论文题名: Groundwater Isotopes Biased Toward Heavy Rainfall Events and Implications on the Local Meteoric Water Line
作者: Li J. ; Pang Z. ; Kong Y. ; Wang S. ; Bai G. ; Zhao H. ; Zhou D. ; Sun F. ; Yang Z.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2018
卷: 123, 期: 11 起始页码: 6259
结束页码: 6266
语种: 英语
英文关键词: amount threshold
; groundwater recharge
; heavy rainfall
; isotopes
; LMWL
Scopus关键词: aquifer
; groundwater
; isotopic composition
; meteoric water
; phreatic zone
; precipitation (climatology)
; rainfall
; recharge
; stable isotope
; threshold
; tracer
; water level
; Beijing [China]
; China
; Yanqing Basin
英文摘要: Stable water isotopes are useful tracers in the groundwater recharge studies, where the local meteoric water line (LMWL) usually serves as a reference line and the amount-weighted average value of precipitation is regarded as the input meteoric signal. Based on a comparison of isotope composition between precipitation and groundwater collected from a groundwater basin in the Beijing area, we verify that small precipitation events do not constitute effective groundwater recharge in a (semi) arid region, causing that the isotopes in groundwater are biased toward the meteoric isotopic signal of heavy rainfall events. The positive deflections in groundwater levels from a phreatic aquifer in Yanqing Basin in the Northwest of Beijing revealed that recharge occurs exclusively during the rainy seasons and is clearly associated with heavy rainfall events (>10 mm/day). The isotope composition of groundwater samples that plot far below the mean meteoric input value, further strengthen the dependence of groundwater recharge on heavy rainfall events. We construct the LMWLs with different regression methods using daily stable isotope data from seven hydro-meteorological stations over a hydrological year. When the δ18O ranges from −20‰ to 10‰, the lines are quite similar regressed by the weighted monthly values and by heavy rainfall events, so the conventional LMWL can still serve as the reference line for groundwater recharge studies. ©2018. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/113711
Appears in Collections: 气候减缓与适应
There are no files associated with this item.
作者单位: Key Laboratory of Shale Gas and Geoengineering, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China; Institutions of Earth Science, Chinese Academy of Sciences, Beijing, China; College of Earth Sciences, University of Chinese Academy of Sciences, Beijing, China; Beijing Institute of Hydrogeology and Engineering Geology, Beijing, China; Beijing Hydrologica Center, Beijing, China
Recommended Citation:
Li J.,Pang Z.,Kong Y.,et al. Groundwater Isotopes Biased Toward Heavy Rainfall Events and Implications on the Local Meteoric Water Line[J]. Journal of Geophysical Research: Atmospheres,2018-01-01,123(11)