Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2018JD028405 |
Reconstructed Precipitation Tritium Leads to Overestimated Groundwater Recharge | |
Li, Zhi1; Si, Bingcheng2 | |
2018-09-16 | |
发表期刊 | JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
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ISSN | 2169-897X |
EISSN | 2169-8996 |
出版年 | 2018 |
卷号 | 123期号:17页码:9858-9867 |
文章类型 | Article |
语种 | 英语 |
国家 | Peoples R China; Canada |
英文摘要 | Time series of precipitation tritium contents are often used for groundwater recharge estimation based on the tritium mass ratio of the (un) saturated zones to precipitation. But records of the precipitation tritium measurements are sparse and often need to be reconstructed. Uncertainties associated with reconstructed records can affect the recharge estimates, but this has received little attention. Here we leverage four >15m deep, exceptionally well preserved unsaturated zone tritium profiles to quantify the uncertainty in Tritium mass balance from precipitation tritium reconstruction. The tritium profiles have bomb tritium peaks at 7.2-10.5m below the surface and peaks ranging from 46 to 235 tritium unit. We first estimate the diffuse recharge by the tritium peak method. Since this method is independent of any precipitation tritium reconstruction, the estimated recharge was used as truth to evaluate four precipitation tritium reconstruction methods: two interpolation methods and two reference curve methods. Direct comparison between the observed and simulated precipitation tritium showed that the reference curve methods performed more poorly than the interpolation methods. Indirect evaluation by comparing the recharge rates estimated by the tritium storage method with our truth measurements showed that tritium storage method overestimated recharge by 100% to 200%. Our results suggest that the atmospheric tritium flux was greatly underestimated, especially by the reference curve methods. As such, groundwater recharge at our sites would be overestimated. This has implications for using these standard approaches elsewhere. |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000445617500054 |
WOS关键词 | GENERAL-CIRCULATION MODEL ; LOESS PLATEAU ; ENVIRONMENTAL TRACERS ; UNSATURATED ZONE ; CHINA ; WATER ; TIME ; MECHANISM ; IMPACTS ; QUALITY |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS研究方向 | Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/33814 |
专题 | 气候变化 |
作者单位 | 1.Northwest A&F Univ, Coll Nat Resources & Environm, Yangling, Shaanxi, Peoples R China; 2.Univ Saskatchewan, Dept Soil Sci, Saskatoon, SK, Canada |
推荐引用方式 GB/T 7714 | Li, Zhi,Si, Bingcheng. Reconstructed Precipitation Tritium Leads to Overestimated Groundwater Recharge[J]. JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,2018,123(17):9858-9867. |
APA | Li, Zhi,&Si, Bingcheng.(2018).Reconstructed Precipitation Tritium Leads to Overestimated Groundwater Recharge.JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,123(17),9858-9867. |
MLA | Li, Zhi,et al."Reconstructed Precipitation Tritium Leads to Overestimated Groundwater Recharge".JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES 123.17(2018):9858-9867. |
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