Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2019WR025811 |
Resolving Drivers of a Spatial Gradient in Evapotranspiration Through the Simulated Translocation of Landscape Factors | |
Jepsen, S. M.1,2; Harmon, T. C.1,2 | |
2020-02-01 | |
发表期刊 | WATER RESOURCES RESEARCH |
ISSN | 0043-1397 |
EISSN | 1944-7973 |
出版年 | 2020 |
卷号 | 56期号:2 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | A number of studies using the so-called space-for-time substitution (STS) approach have predicted that climate warming of snow-influenced watersheds would result in alarming increases in long-term ET and concurrent decreases in runoff. This empirical approach implicitly assumes that any spatial covariation of factors across the landscape would remain fixed in time, that is, the "covariance-stationarity" assumption. A better understanding of this assumption, in terms of what it means and how it affects predictions, is needed to assess the implications of STS predictions. To address this, we examined the influence of the covariance-stationarity assumption on STS predictions of long-term ET in response to warming. We did this by simulating changes in ET resulting from elevational transfers of factors in ways that emulate STS. This approach was applied to the upper San Joaquin River, a snow-influenced watershed in the Sierra Nevada, USA. Predicted increases in ET from STS including the covariance-stationarity assumption were 3-7 times greater than STS treating air temperature as an independent factor, over most of the higher elevations. Based on results from a factorial analysis, these differences were attributed primarily to the pedologic gradient across elevation, which transitions from loamy Alfisol soils at lower elevations to sandy Entisol/Inceptisol soils and exposed bedrock at upper elevations. The covariance-stationarity assumption does not seem realistic for soil and air temperature over timescales of projected climate. Therefore, the confounding of these factors in the STS approach can substantially overestimate the sensitivity of long-term ET to air temperature. |
英文关键词 | evapotranspiration runoff climate warming space-for-time substitution elevation soil type |
领域 | 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000535672800003 |
WOS关键词 | FOR-TIME SUBSTITUTION ; WATER ASSESSMENT-TOOL ; SIERRA-NEVADA ; CLIMATE-CHANGE ; SWAT MODEL ; HEADWATER CATCHMENTS ; ECOSYSTEM SERVICES ; SOIL-MOISTURE ; SNOW ; RUNOFF |
WOS类目 | Environmental Sciences ; Limnology ; Water Resources |
WOS研究方向 | Environmental Sciences & Ecology ; Marine & Freshwater Biology ; Water Resources |
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/280553 |
专题 | 资源环境科学 |
作者单位 | 1.Univ Calif Merced, Dept Civil & Environm Engn, Merced, CA 95343 USA; 2.Univ Calif Merced, Environm Syst Grad Program, Merced, CA 95343 USA |
推荐引用方式 GB/T 7714 | Jepsen, S. M.,Harmon, T. C.. Resolving Drivers of a Spatial Gradient in Evapotranspiration Through the Simulated Translocation of Landscape Factors[J]. WATER RESOURCES RESEARCH,2020,56(2). |
APA | Jepsen, S. M.,&Harmon, T. C..(2020).Resolving Drivers of a Spatial Gradient in Evapotranspiration Through the Simulated Translocation of Landscape Factors.WATER RESOURCES RESEARCH,56(2). |
MLA | Jepsen, S. M.,et al."Resolving Drivers of a Spatial Gradient in Evapotranspiration Through the Simulated Translocation of Landscape Factors".WATER RESOURCES RESEARCH 56.2(2020). |
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