CO2 flux measurement method of forest

摘要

PROBLEM TO BE SOLVED: To provide a CO₂ flux measuring method for a forest for accurately evaluating an absorption amount of CO₂ in the whole forest.;SOLUTION: When receiving a laser beam emitted from a transmitter of a scintillometer in the sky of the forest by a receiver of the scintillometer, fluctuation of light intensity, based on scintillation caused by a turbulence flow or temperature fluctuation in an upper side of the forest is measured to find a dissipation rate ε_T of the temperature fluctuation, measures further the dispersion of the fluctuation about the temperature or the square root σ_T thereof, the dispersion of the fluctuation about steam or the square root σ_q thereof, the dispersion of the fluctuation about the CO₂ or the square root σ_C thereof, by a vortex correlation sensor in the sky over the forest, the dissipation rate ε_q of the steam and the dissipation rate ε_c of the CO₂ are calculated respectively based on the expressions (1) and (2), and the flux is found from the respective dissipation rates ε_T, ε_q, ε_c that are scalar quantities.;COPYRIGHT: (C)2006,JPO&NCIPI