CO2 flux measurement method of forest

摘要

PROBLEM TO BE SOLVED: To provide a measuring method of CO₂ flux for evaluating absorbed amount of CO₂ in the entire forest with a high degree of accuracy.;SOLUTION: In this method, based on the fact that for the ratio between ε_TSAS/ε_TEC, a dissipation rate in temperature variation when using a scintillometer and that of when using eddy correlation method, both correlation with the ratio RA between measurement range A_SAS in using the scintillometer and A_EC in using an eddy correlation sensor, RA(=A_SAS/A_EC) and correlation with atmospheric turbulent intensity σ_w/u are high, this atmospheric turbulent intensity σ_w/u is measured while previously preparing a relational expression with these two elements of RA and σ_w/u as its parameters. Then sensible heat flux H_EC calculated by the eddy correlation method is compensated to sensible heat flux H_SAS equivalent to the value calculated by using the scintillometer, in addition, both latent heat flux λE_EC and CO₂ flux F_cEC calculated by the eddy correlation method are also compensated to latent heat flux λE_SAS and CO₂ flux F_cSAS equivalent to the values calculated by using the scintillometer.;COPYRIGHT: (C)2011,JPO&INPIT