氣溫日資料轉換為小時資料

 Modeling temporal variation in air temperature

 

From

Campbell, G.S. and J.M. Norman (1997) An introduction to environmental biophysics

 

Equation (2.2) and (2.3) page23

 

 

dimentionless diurnal temperature function

Gamma(t) = 0.44 – 0.46 sin(w * t + 0.9) + 0.11 sin(2wt + 0.9)

 

Where w = pi/12, t is time of day in hours

 

The hourly temperature calculated from following equations

T(t) = T_max,i-1 Gamma(t) + T_min,i [1-Gamma(t) ]     0 < t <= 5

T(t) = T_max,i Gamma(t) + T_min,i [1-Gamma(t) ]     5 < t <= 14

T(t) = T_max,i Gamma(t) + T_min,i+1 [1-Gamma(t) ]     5 < t <= 14

 

Here, Tmax is the daily maximum temperature and Tmin is the minimum temperature. The subscript I represents the present day; i - 1 is the previous day, and i + 1 is the next day.

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