At night, CO2 flux data were deleted when friction velocity (u⁄) was lower than 0.35 m s1 (Tong et al., 2012).
The data more than three times variance with the average were regarded as the abnormal values. Moreover, the abnormal data owing to instrument malfunction and unfavorable meteorological conditions (rain and dew)were deleted.
The short gaps (<2 h) were filled by a linear method.
The longer gaps in the daytime and nighttime were filled using the mean diurnal variation (MDV) and nonlinear regression methods,respectively (Falge et al., 2001).
การแปล กรุณารอสักครู่..