气候变化领域集成服务门户(CCPortal): Elevational control of isotopic composition and application in understanding hydrologic processes in the mid Merced River catchment, Sierra Nevada, California, USA

CCPortal

DOI	10.5194/hess-28-2239-2024
	Elevational control of isotopic composition and application in understanding hydrologic processes in the mid Merced River catchment, Sierra Nevada, California, USA
	Liu, Fengjing; Conklin, Martha H.; Shaw, Glenn D.
发表日期	2024
ISSN	1027-5606
EISSN	1607-7938
起始页码	28
结束页码	10
卷号	28 期号:10
英文摘要	Mountain snowpack has been declining and more precipitation has fallen as rainfall than snowfall, particularly in the western US. Isotopic composition in stream water, springs, groundwater, and precipitation was examined to understand the impact of declining snowpack on hydrologic processes in the mid Merced River catchment (1873 km(2)), Sierra Nevada, California. Mean isotopic values in small tributaries (catchment area < 122 km (2)), rock glacier outflows, and groundwater from 2005 to 2008 were strongly correlated with mean catchment elevation (R-2 = 0.96 for delta H-2, n = 16, p < 0.001), with an average isotopic lapse rate of -1.9 parts per thousand per 100 m for delta H-2 and - 0.22 parts per thousand per 100 m for delta O-18 in meteoric water. The lapse rate did not change much over the seasons and was not strongly affected by isotopic fractionation. A catchment-characteristic isotopic value, representing the catchment arithmetic mean isotopic signature in meteoric water, was thus established for each sub-catchment based on the lapse rate to elucidate hydrometeorologic and hydrologic processes such as the duration and the magnitude of snowmelt events and elevational water sources of streamflow and groundwater for ungauged catchments. Compared to Tenaya Creek without water falls, the flow and flow duration of Yosemite Creek appear to be much more sensitive to seasonal temperature increases during the baseflow period due to a strong evaporation effect caused by waterfalls, suggesting a possible prolonged dry-up period of Yosemite Falls in the future. Groundwater in Yosemite Valley (similar to 900-1200 m) was recharged primarily from the upper snow-rain transition zone (2000-2500 m), suggesting its strong vulnerability to shifts in the snow-rain ratio. The information gained from this study helps advance our understanding of hydrologic responses to climate change in snowmelt-fed river systems.
语种	英语
WOS研究方向	Geology ; Water Resources
WOS类目	Geosciences, Multidisciplinary ; Water Resources
WOS记录号	WOS:001233359100001
来源期刊	HYDROLOGY AND EARTH SYSTEM SCIENCES
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/290422
作者单位	Michigan Technological University; University of California System; University of California Merced; University of California System; University of California Merced; University of Montana System; Montana Technological University; University of Montana
推荐引用方式 GB/T 7714	Liu, Fengjing,Conklin, Martha H.,Shaw, Glenn D.. Elevational control of isotopic composition and application in understanding hydrologic processes in the mid Merced River catchment, Sierra Nevada, California, USA[J],2024,28(10).
APA	Liu, Fengjing,Conklin, Martha H.,&Shaw, Glenn D..(2024).Elevational control of isotopic composition and application in understanding hydrologic processes in the mid Merced River catchment, Sierra Nevada, California, USA.HYDROLOGY AND EARTH SYSTEM SCIENCES,28(10).
MLA	Liu, Fengjing,et al."Elevational control of isotopic composition and application in understanding hydrologic processes in the mid Merced River catchment, Sierra Nevada, California, USA".HYDROLOGY AND EARTH SYSTEM SCIENCES 28.10(2024).