DOI: 10.1029/2017JD028093
Scopus记录号: 2-s2.0-85050466248
论文题名: Seasonal Patterns of Water Cycling in a Deep, Continental Mountain Valley Inferred From Stable Water Vapor Isotopes
作者: Fiorella R.P. ; Poulsen C.J. ; Matheny A.M.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2018
卷: 123, 期: 14 起始页码: 7271
结束页码: 7291
语种: 英语
英文关键词: continental recycling
; moisture transport
; stable water isotopes
; water vapor
英文摘要: The origin of atmospheric moisture is difficult to determine from meteorological measurements alone. Stable water vapor isotopes can be used to trace the atmospheric history of water vapor, and therefore are a powerful tool for understanding water cycle processes across a range of spatial and temporal scales. We present subhourly measurements of summer and winter vapor isotope ratios from a deep mountain valley in northwestern Wyoming. Vapor isotopes are paired with local meteorological measurements, and relationships between local vapor isotopic compositions and large-scale air transport are explored using atmospheric back trajectories and a Lagrangian moisture source diagnostic. Isotopic compositions vary on diurnal to seasonal timescales, and to first order, track changes in local specific humidity. Local vapor isotopic composition varies with air transport pathway in both seasons, but cannot be uniquely mapped to a source region due to continental recycling of vapor. Diurnal variability in d-excess is substantial in summer, but not in winter. This seasonal contrast is likely driven by local surface and near-surface processes including evapotranspiration and boundary layer mixing, which partially overprint the source isotope ratios of the regional source during the summer and casts doubt on the use of d-excess over continental interiors as a tracer of evaporative conditions over the ocean. Continued monitoring of the isotopic composition of near-surface vapor in continental settings may help detect changes in regional moisture convergence and the local evapotranspiration flux, as well as assess meso-to-regional scale responses to hydrologic variability. ©2018. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/113489
Appears in Collections: 气候减缓与适应
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作者单位: Department of Earth and Environmental Sciences, University of Michigan, Ann Arbor, MI, United States; Department of Geology and Geophysics, University of Utah, Salt Lake City, UT, United States; Department of Civil, Environmental, and Geodetic Engineering, The Ohio State University, Columbus, OH, United States; Department of Geological Sciences, University of Texas at Austin, Austin, TX, United States
Recommended Citation:
Fiorella R.P.,Poulsen C.J.,Matheny A.M.. Seasonal Patterns of Water Cycling in a Deep, Continental Mountain Valley Inferred From Stable Water Vapor Isotopes[J]. Journal of Geophysical Research: Atmospheres,2018-01-01,123(14)