干旱区生态环境知识资源中心(Arid): Modeling Spatial and Temporal Variation in Natural Background Specific Conductivity

Arid

DOI	10.1021/acs.est.8b06777
	Modeling Spatial and Temporal Variation in Natural Background Specific Conductivity
	Olson, John R.1; Cormier, Susan M.2
通讯作者	Olson, John R.
来源期刊	ENVIRONMENTAL SCIENCE & TECHNOLOGY
ISSN	0013-936X
EISSN	1520-5851
出版年	2019
卷号	53 期号:8 页码:4316-4325
英文摘要	Understanding how background levels of dissolved minerals vary in streams temporally and spatially is needed to assess salinization of fresh water, establish reasonable thresholds and restoration goals, and determine vulnerability to extreme climate events like drought. We developed a random forest model that predicts natural background specific conductivity (SC), a measure of total dissolved ions, for all stream segments in the contiguous United States at monthly time steps between the years 2001 to 2015. Models were trained using 11 796 observations made at 1785 minimally impaired stream segments and validated with observations from an additional 92 segments. Static predictors of SC included geology, soils, and vegetation parameters. Temporal predictors were related to climate and enabled the model to make predictions for different dates. The model explained 95% of the variation in SC among validation observations (mean absolute error = 29 mu S/cm, Nash-Sutcliffe efficiency = 0.85). The model performed well across the period of interest but exhibited bias in Coastal Plain and Xeric regions (26 and 30%, respectively). National model predictions showed large spatial variation with the greatest SC predicted to occur in the desert southwest and plains. Model predictions also reflected changes at individual streams during drought.
类型	Article
语种	英语
国家	USA
开放获取类型	Green Accepted
收录类别	SCI-E
WOS记录号	WOS:000465190300031
WOS关键词	FRESH-WATER ; DROUGHT IMPACTS ; RANDOM FORESTS ; QUALITY ; RIVER ; SALINIZATION ; EXTIRPATION ; COMMUNITIES ; SALINITY ; PATTERNS
WOS类目	Engineering, Environmental ; Environmental Sciences
WOS研究方向	Engineering ; Environmental Sciences & Ecology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/215527
作者单位	1.Calif State Univ Monterey Bay, Sch Nat Sci, 100 Campus Ctr, Seaside, CA 93955 USA; 2.US EPA, Off Res & Dev, Natl Ctr Environm Assessment, 26 Martin Luther King Dr West, Cincinnati, OH 45268 USA
推荐引用方式 GB/T 7714	Olson, John R.,Cormier, Susan M.. Modeling Spatial and Temporal Variation in Natural Background Specific Conductivity[J],2019,53(8):4316-4325.
APA	Olson, John R.,&Cormier, Susan M..(2019).Modeling Spatial and Temporal Variation in Natural Background Specific Conductivity.ENVIRONMENTAL SCIENCE & TECHNOLOGY,53(8),4316-4325.
MLA	Olson, John R.,et al."Modeling Spatial and Temporal Variation in Natural Background Specific Conductivity".ENVIRONMENTAL SCIENCE & TECHNOLOGY 53.8(2019):4316-4325.