Application of inverse Lagrangian dispersion analysis in simulating forest evapotranspiration

Abstract

Abstract: Based on the localized near field (LNF) theory and coupled with the distribution of vertical velocity standard deviation (σ_{w_(z)}) and Lagrangian integral time scales T_L(z) within the canopy proposed by Raupach,the relationship between water vapor source/sink distribution and its mean concentration profile was constructed.The estimation of forest evapotranspiration was also conducted by the inverse Lagrangian dispersion analysis,which can calculate the water vapor source/sink distribution from its mean concentration profile.The calculated forest evapotranspiration was compared with the measured values.It was concluded that the simulated precision of the daily daytime evapotranspiration could reach 87.3%,the calculated results was 15%～25% higher than the measured one,the nighttime evapotranspiration was about 70% of the daily value,and the total monthly evapotranspiration from June to August was higher than that in May and September.

Key words: Inverse Lagrangian dispersion analysis, Forest evapotranspiration, Eddy covariance method

CLC Number:

S715.4

WANG Anzhi, DIAO Yiwei, JIN Changjie, GUAN Dexin, PEI Tiefan . Application of inverse Lagrangian dispersion analysis in simulating forest evapotranspiration[J]. Chinese Journal of Applied Ecology, 2005, 16(5): 843-848.

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