DOI: 10.1016/j.epsl.2018.05.047
Scopus记录号: 2-s2.0-85048087206
论文题名: Spatiotemporal distribution of river water stable isotope compositions and variability of lapse rate in the central Rocky Mountains: Controlling factors and implications for paleoelevation reconstruction
作者: Zhu L. ; Fan M. ; Hough B. ; Li L.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2018
卷: 496 起始页码: 215
结束页码: 226
语种: 英语
英文关键词: evaporation
; Great Plains
; paleoelevation
; river water
; Rocky Mountains
; stable isotopes
Scopus关键词: Atmospheric humidity
; Catchments
; Evaporation
; Isotopes
; Landforms
; Moisture
; Great Plains
; Paleoelevation
; River water
; Rocky Mountains
; Stable isotopes
; Rivers
; evaporation
; isotopic composition
; isotopic fractionation
; paleoclimate
; paleoenvironment
; reconstruction
; river water
; spatial variation
; spatiotemporal analysis
; stable isotope
; temporal variation
; Bighorn River
; Great Plains
; Rocky Mountains
; United States
英文摘要: Stable isotope-based paleoaltimetry is the most widely used approach for paleoelevation reconstruction. Interpretations of stable isotope data in continental interiors, however, are undermined by surface water isotope compositions that are influenced by multiple factors. Here we present a stable isotope dataset of modern river water samples collected over two summers and one spring from the central Rocky Mountains (Rockies) and the adjacent Great Plains. By examining the spatial and temporal variations of river water δ18O, δD and d-excess values, and their relationships with climatic and geographic parameters, as well as through back trajectory analysis of moisture sources, we elucidate the influences of elevation and climatic parameters on the spatiotemporal variation of river water isotopic values. In the Bighorn River drainage, a typical intermontane drainage in the central Rockies, the isotopic difference between highland and lowland rivers is small, which we attribute to highland precipitation that dominates lowland river discharge. In the North Platte River drainage across the central Rockies and Great Plains, the river water δ18O values show poor correlation with elevation west of 105°W (central Rockies), but increase as elevation decrease east of 105°W (in the western Great Plains). This eastward increase across the western Great Plains leads to an average oxygen isotope lapse rate of −2.3‰/km, which we interpret as being caused primarily by condensation temperature-controlled isotopic fractionation at various elevations, and secondarily by evaporation in the upper reaches of streams that contribute to the North Platte River plus direct contribution of moisture from the Gulf of Mexico in the Great Plains. In this continental interior setting, multiple moisture sources, including recycled continental moisture, contribute to surface water, and evaporation influences river water isotope values to various degrees depending on the relative humidity within an individual river catchment. These results suggest that paleoclimate and atmospheric circulation pattern must be carefully evaluated when applying stable isotope-based paleoaltimetry in continental interiors. Our findings have implications for paleoelevation reconstruction in the study area, including that 1) within the central Rockies, the isotopic difference of river water and unevaporated basinal precipitation can be used to infer paleorelief of the Laramide ranges with respect to the basin floors; 2) along a regional transect crossing the central Rockies and Great Plains, the modern isotope lapse rate of the North Platte River drainage can be used to constrain the paleorelief between the two regions in semi-arid climate. © 2018 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109807
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: University of Texas at Arlington, Department of Earth and Environmental Sciences, Arlington, TX 76019, United States; State University of New York at Oswego, Department of Atmospheric and Geological Sciences, Oswego, NY 13126, United States
Recommended Citation:
Zhu L.,Fan M.,Hough B.,et al. Spatiotemporal distribution of river water stable isotope compositions and variability of lapse rate in the central Rocky Mountains: Controlling factors and implications for paleoelevation reconstruction[J]. Earth and Planetary Science Letters,2018-01-01,496