HR: 0800h
AN: C51B-1027    [Abstracts]
TI: Continuous and high resolution time series of water vapor 18O/16O ratio in surface air in New England
AU: * Lee, X
EM: xuhui.lee@yale.edu
AF: School of Forestry and Environmental Studies, Yale University, 21 Sachem Street, New Haven, CT 06511
AU: Smith, R B
EM: ronald.smith@yale.edu
AF: Department of Geology and Geophysics, 210 Whitney Ave, New Haven, CT 06511
AB: In this paper we report the results of the analysis of a high time resolution (1hr) continuous time series of water vapor 18O/16O ratio near the ground from December 2003 to December 2004. The observation is made with tunable diode laser analyzer and is calibrated with a dripping device that drips water of known isotope ratio in an evaporating flask. It is shown that during precipitation events the water vapor isotope ratio is in equilibrium with raindrops but is much higher than the equilibrium value during snow storms. The temporal variations in the vapor isotope ratio are influenced by regional airmass movement, land/sea breeze circulation, boundary layer entrainment and evaporation/transpiration cycle. A frontal hysteresis phenomenon is also observed.
UR: http://pantheon.yale.edu/~xhlee/pubs.htm
DE: 1854 Precipitation (3354)
DE: 1894 Instruments and techniques
DE: 0315 Biosphere/atmosphere interactions
DE: 0355 Thermosphere--composition and chemistry
DE: 0394 Instruments and techniques
SC: Cryosphere [C]
MN: 2004 AGU Fall Meeting