Lidar determination of horizontal and vertical variability in water vapor over cotton

A solar-blind lidar system is being developed for remote noninvasive measurement of atmospheric water vapor concentrations in three dimensions and over time. Based on a high-power KrF laser operating at 248 nm, the truck-mounted system has 1.5-m resolution of water vapor concentrations along the bea...

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Bibliographic Details
Published in:Remote sensing of environment 1990, Vol.32 (2), p.81-90
Main Authors: Barnes, Fairley J., Karl, Robert J., Kunkel, Kenneth E., Stone, Gregory L.
Format: Article
Language:English
Subjects:
540110
553000 - Agriculture & Food Technology
60 APPLIED LIFE SCIENCES
AGRICULTURE
ATMOSFERA
ATMOSPHERE
CANOPIES
CANOPY
COTTON PLANTS
COUVERT
CROPS
CUBIERTA DE COPAS
CULTIVOS
ENVIRONMENTAL SCIENCES
EVAPORATION
EVAPOTRANSPIRACION
EVAPOTRANSPIRATION
FLUIDS
GASES
GOSSYPIUM
MAGNOLIOPHYTA
MAGNOLIOPSIDA
MEASUREMENT
MEASURING INSTRUMENTS
MEDICION
MESURE
PHASE TRANSFORMATIONS
PLANTE DE CULTURE
PLANTS
RADAR
RANGE FINDERS
REMOTE SENSING
TELEDETECCION
TELEDETECTION
TRANSPIRATION
TURBULENCE
VAPEUR D'EAU
VAPOR DE AGUA
VAPORS
WATER VAPOR
WATER VAPOUR
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Summary:A solar-blind lidar system is being developed for remote noninvasive measurement of atmospheric water vapor concentrations in three dimensions and over time. Based on a high-power KrF laser operating at 248 nm, the truck-mounted system has 1.5-m resolution of water vapor concentrations along the beam path from 100 m to 500 m from the truck location. Field tests in 1988 over an incomplete cotton canopy showed that the system (operating in a one-dimensional mode) was capable of detecting small changes in water mixing ratios close to the canopy. Both spatial and temporal trends agreed qualitatively with those measured with conventional point instrumentation. Vertical gradients measured by lidar exhibited a larger range than conventional hygrometric measurements, but the qualitative agreement suggests the potential for lidar to measure small spatial gradients. Further development of the system will allow us to observe the structural detail in turbulent processes over broad areas. Pattern analysis and correlation between time scans will permit the estimation of the movement rates of eddies and their contribution to the overall flux of water vapor.
ISSN:0034-4257
1879-0704
DOI:10.1016/0034-4257(90)90009-B