Abstract:
The serial daily potential evapotranspiration was calculated from meteorological data collected from the Yucheng Comphrensive Experimental Station,Chinese Academy of Sciences.Based on the serial data,normalized
ETP series (
NETP)were generated with the mean of
ETP removed and the residue dimen-sionalized by standard deviation.Furtherly,a discrete
AR(1)model was constructed for NETP.On the basis of the discrete
AR(1)model,the corresponding continuous parameter model,namely A(1),wasest up and the coefficients invol vedestimated. A(1)is a first order stochastic differential equation.The probability density function,autocorrelation function and spectral density function associated with the A(1) were obtained analytically.