Measurement and Interpretation of Water Vapor Isotopic Fluxes Xuhui Lee Yale University School of Forestry and Environmental Studies.

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Presentation transcript:

Measurement and Interpretation of Water Vapor Isotopic Fluxes Xuhui Lee Yale University School of Forestry and Environmental Studies

Collaborators University of Minnesota John Baker, Tim Griffis Yale University Kyounghee Kim, Ron Smith, Lisa Welp Campbell Scientific Steve Sargent, Bert Tanner Chinese Academy of Sciences Xiaomin Sun, Xuefa Wen, Guiru Yu

Transpiration, photosynthesis, leaf water enrichment, and the Pelect effect H 2 O + CO 2 CH 2 O + O 2 sunlight xylem water

TDL system for measuring water vapor and flux isotope ratios dripper dry air enriched water manifold N 2 gas pump bypass flow reference cell sample cell gradient interface air 1 air 2 1 Flux isotope ratio

Soybean field, Minnesota

Instrument Tower Great Mountain Forest, Connecticut

Eddy Covariance Instrument, Great Mountain

Tunable Diode Laser Analyzer, Great Mountain

Dripper Calibration Device

Water Vapor Gradient Aug 30 – Sep 7, 2005 Rain Dew

Seasonal variation of  ET,  P and  X Great Mountain, 2005 precipitation ET xylem water of overstory trees

Isotopic composition of water pools Soybean field, Minnesota, 2006

18 O in H 2 O and CO 2 Soybean, Minnesota, 2006

CO 2 and 18 O-CO 2 Profiles Soybean, Minnesota, 2006

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