Heat, Vapor, and CO2 Flux
Eddy covariance measurements
LI7500 CO2/H2O Open-Path Gas Analyzer
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The LI7500 has been superceded by the LI7500A. The LI7500 is LI-COR's open-path, high-speed, high-precision, nondispersive-infrared gas analyzer (IRGA). It accurately measures the in-situ densities of carbon dioxide and water vapor in turbulent air structures. In an eddy-covariance application, the LI7500 is used in conjunction with a CSAT3 Sonic Anemometer to determine CO2 and H2O fluxes. The primary components of the LI7500 are the sensor head and the electronics enclosure. |
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About Heat, Vapor, and CO2 Flux
By finding the covariance between the vertical wind speed fluctuations with temperature as determined by the CSAT3 or CA27 (with 127TC) against humidity and carbon dioxide fluctuations, as measured by fast response sensors like a fine wire thermocouple (FW05), krypton hygrometer (KH20), or an open path CO2/H2O analyzer (LI7500), the sensible and latent heat flux, as well as vapor and CO2 fluxes, can be found. Virtual sensible heat flux can be determined by finding the covariance between the sonically determined temperature and vertical wind speed fluctuations.