The nocturnal water cycle in an open-canopy forest Public Deposited

http://ir.library.oregonstate.edu/concern/articles/hq37vq16s

This is the publisher’s final pdf. The published article is copyrighted by the American Geophysical Union and can be found at:  http://onlinelibrary.wiley.com/journal/10.1002/(ISSN)2169-8996.

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  • 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.
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  • Berkelhammer, M., J. Hu, A. Bailey, D. C. Noone, C. J. Still, H. Barnard, D. Gochis, G. S. Hsiao, T. Rahn, and A. Turnipseed (2013), The nocturnal water cycle in an open-canopy forest, Journal of Geophysical Research: Atmospheres, 118, 10,225-10,242. doi:10.1002/jgrd.50701
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  • description.provenance : Approved for entry into archive by Erin Clark(erin.clark@oregonstate.edu) on 2014-05-05T17:30:42Z (GMT) No. of bitstreams: 2 StillChristopherForestryNocturnalWaterCycle.pdf: 3179957 bytes, checksum: 7ca5b6ecdbdba0c45beb82152e628be2 (MD5) StillChristopherForestryNocturnalWaterCycle_SupportingInformation.zip: 1762272 bytes, checksum: 5d292d14d4c94e67da2c5c7de4f5b81f (MD5)
  • description.provenance : Made available in DSpace on 2014-05-05T17:30:42Z (GMT). No. of bitstreams: 2 StillChristopherForestryNocturnalWaterCycle.pdf: 3179957 bytes, checksum: 7ca5b6ecdbdba0c45beb82152e628be2 (MD5) StillChristopherForestryNocturnalWaterCycle_SupportingInformation.zip: 1762272 bytes, checksum: 5d292d14d4c94e67da2c5c7de4f5b81f (MD5) Previous issue date: 2013-09-12
  • description.provenance : Submitted by Erin Clark (erin.clark@oregonstate.edu) on 2014-05-05T17:30:22Z No. of bitstreams: 2 StillChristopherForestryNocturnalWaterCycle.pdf: 3179957 bytes, checksum: 7ca5b6ecdbdba0c45beb82152e628be2 (MD5) StillChristopherForestryNocturnalWaterCycle_SupportingInformation.zip: 1762272 bytes, checksum: 5d292d14d4c94e67da2c5c7de4f5b81f (MD5)

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