Arid
DOI10.2136/vzj2006.0087
Climate variability controls on unsaturated water and chemical movement, High Plains aquifer, USA
Gurdak, Jason J.; Hanson, Randall T.; McMahon, Peter B.; Bruce, Breton W.; McCray, John E.; Thyne, Geoffrey D.; Reedy, Robert C.
通讯作者Gurdak, Jason J.
会议名称International Conference on Groundwater Resources Assesment under the Presures of Humanity and Climate Change
会议日期APR 04-06, 2006
会议地点Kyoto, JAPAN
英文摘要

Responses in the vadose zone and groundwater to interannual, interdecadal, and multidecadal climate variability have important implications for groundwater resource sustainability, yet they are poorly documented and not well understood in most aquifers of the USA. This investigation systematically examines the role of interannual to multidecadal climate variability on groundwater levels, deep infiltration (3-23 m) events, and downward displacement (> 1 m) of chloride and nitrate reservoirs in thick (15-50 m) vadose zones across the regionally extensive High Plains aquifer. Such vadose zone responses are unexpected across much of the aquifer given a priori that unsaturated total-potential profiles indicate upward water movement from the water table toward the root zone, mean annual potential evapotranspiration exceeds mean annual precipitation, and millennia-scale evapoconcentration results in substantial vadose zone chloride and nitrate reservoirs. Using singular spectrum analysis (SSA) to reconstruct precipitation and groundwater level time-series components, variability was identified in all time series as partially coincident with known climate cycles, such as the Pacific Decadal Oscillation (PDO) (10-25 yr) and the El Nino/ Southern Oscillation (ENSO) (2-6 yr). Using these lag-correlated hydrologic time series, a new method is demonstrated to estimate climate-varying unsaturated water flux. The results suggest the importance of interannual to interdecadal climate variability on water-flux estimation in thick vadose zones and provide better understanding of the climate-induced transients responsible for the observed deep infiltration and chemical-mobilization events. Based on these results, we discuss implications for climate-related sustainability of the High Plains aquifer.


来源出版物VADOSE ZONE JOURNAL
ISSN1539-1663
出版年2007
卷号6
期号3
页码533-547
出版者SOIL SCI SOC AMER
类型Article;Proceedings Paper
语种英语
国家USA
收录类别CPCI-S ; SCI-E
WOS记录号WOS:000249015500013
WOS关键词SOUTHWESTERN UNITED-STATES ; QUANTIFYING GROUNDWATER RECHARGE ; NORTH-AMERICAN MONSOON ; HYDROLOGIC TIME-SERIES ; DESERT SOILS ; PACIFIC ; PRECIPITATION ; OSCILLATION ; TEMPERATURE ; EVOLUTION
WOS类目Environmental Sciences ; Soil Science ; Water Resources
WOS研究方向Environmental Sciences & Ecology ; Agriculture ; Water Resources
资源类型会议论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/296879
作者单位(1)USGS, Denver, CO USA;(2)Colorado Sch Mines, Golden, CO 80401 USA;(3)USGS, San Diego, CA USA;(4)Bur Econ Geol, Austin, TX USA
推荐引用方式
GB/T 7714
Gurdak, Jason J.,Hanson, Randall T.,McMahon, Peter B.,et al. Climate variability controls on unsaturated water and chemical movement, High Plains aquifer, USA[C]:SOIL SCI SOC AMER,2007:533-547.
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