globalchange  > 影响、适应和脆弱性
DOI: 10.1002/jgrd.50701
论文题名:
The nocturnal water cycle in an open-canopy forest
作者: Berkelhammer M.; Hu J.; Bailey A.; Noone D.C.; Still C.J.; Barnard H.; Gochis D.; Hsiao G.S.; Rahn T.; Turnipseed A.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期:17
起始页码: 10225
结束页码: 10242
语种: 英语
英文关键词: dewfall ; forest hydrology ; nocturnal boundary layer ; water isotopes
Scopus关键词: Ecosystems ; Isotopes ; Soil moisture ; Soil surveys ; Water absorption ; Water vapor ; dewfall ; Eddy covariance technique ; Forest hydrologies ; Hydrological controls ; Nocturnal boundary layers ; Relative contribution ; Soil moisture sensors ; Water isotope ; Forestry ; absorption ; bioavailability ; boundary layer ; coniferous forest ; eddy covariance ; forest canopy ; isotopic analysis ; isotopic composition ; moisture ; precipitation (climatology) ; transpiration ; turbulence ; water vapor
英文摘要: The movement of moisture into, out-of, and within forest ecosystems is modulated by feedbacks that stem from processes which couple plants, soil, and the atmosphere. While an understanding of these processes has been gleaned from Eddy Covariance techniques, the reliability of the method suffers at night because of weak turbulence. During the summer of 2011, continuous profiles of the isotopic composition (i.e., δ18O and δD) of water vapor and periodic measurements of soil, leaf, and precipitation pools were measured in an open-canopy ponderosa pine forest in central Colorado to study within-canopy nocturnal water cycling. The isotopic composition of the nocturnal water vapor varies significantly based on the relative contributions of the three major hydrological processes acting on the forest: dewfall, exchange of moisture between leaf waters and canopy vapor, and periodic mixing between the canopy and background air. Dewfall proved to be surprisingly common (∼30% of the nights) and detectable on both the surface and within the canopy through the isotopic measurements. While surface dew could be observed using leaf wetness and soil moisture sensors, dew in the foliage was only measurable through isotopic analysis of the vapor and often occurred even when no dew accumulated on the surface. Nocturnal moisture cycling plays a critical role in water availability in forest ecosystems through foliar absorption and transpiration, and assessing these dynamics, as done here, is necessary for fully characterizing the hydrological controls on terrestrial productivity. Key Points Profiles of isotope ratio of H2O(v) yield new insight on nocturnal water cyclingDew is a critical source of bio-available water and effects latent heat budgetDeuterium-excess of water vapor clearly tags canopy-influenced moisture ©2013. American Geophysical Union. All Rights Reserved.
资助项目: EAR-0910831
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/63337
Appears in Collections:影响、适应和脆弱性
气候减缓与适应

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作者单位: Department of Atmospheric and Oceanic Sciences, Cooperative Institute for Research in Environmental Sciences, University of Colorado Boulder, Boulder, CO 80309, United States; Department of Ecology, Montana State University, Bozeman, MT 59717, United States; Forest Ecosystems and Society, Oregon State University, Corvallis, OR, United States; Department of Geography, Institute for Arctic and Alpine Research, University of Colorado Boulder, Boulder, CO, United States; Research Applications Laboratory, National Center for Atmospheric Research, Boulder, CO, United States; Picarro Inc., Santa Clara, CA, United States; Earth and Environmental Sciences Division, Los Alamos National Laboratory, Los Alamos, NM, United States; Atmospheric Chemistry Division, National Center for Atmospheric Research, Boulder, CO, United States

Recommended Citation:
Berkelhammer M.,Hu J.,Bailey A.,et al. The nocturnal water cycle in an open-canopy forest[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(17)
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