Chapter 3 3.2.1 Radiation and photosynthesis (1)Radiation Q=D+S Rg=Ⅳ-F↑=(1-)Q-Fo Fo=Eg-8Ea Measured data Calculation 2021/2/22 Assessment of Climate/Change Impacts 11 of x
Chapter 3 2021/2/22 Assessment of Climate/Change Impacts 11 of x 3.2.1 Radiation and photosynthesis (1) Radiation Q = D + S Rg = F - F =(1-)Q - Fo Fo=Eg - Ea • Measured Data • Calculation
Chapter 3 Measured radiation Solar radiation: Q, D,S, R Terrestrial radiation: Fo, Eg, ea Radiation stations (98) Class one(17: Q, D, s,R, Fo Class two( 33): Q, Fo Class three(48): Q Weather stations:s, c 2021/2/22 Assessment of Climate/Change Impacts 12 of x
Chapter 3 2021/2/22 Assessment of Climate/Change Impacts 12 of x Measured Radiation • Solar radiation: Q，D，S，R • Terrestrial radiation: Fo，Eg，Ea • Radiation stations (98) Class one(17): Q，D，S，R，Fo Class two(33): Q， Fo Class three(48): Q • Weather stations: s，c
Chapter 3 Calculation of radiation Solar radiation: Q, D,s Terrestrial radiation: Fo, Rg, Eg, Ea References 翁笃鸣.中国辐射气候,气象出版社,1997 2021/2/22 Assessment of Climate/Change Impacts 13 of x
Chapter 3 2021/2/22 Assessment of Climate/Change Impacts 13 of x Calculation of Radiation • Solar radiation: Q，D，S • Terrestrial radiation: Fo，Rg，Eg，Ea Reference: 翁笃鸣. 中国辐射气候，气象出版社，1997
Chapter 3 Calculation of radiation Radiant flux(J/s, w) Radiant flux density(w/m") Radiation amount (w/md or mon) Unit conversion 1 cal= 4. 187J 1J=1Nm=2.78*107kwh=0239caI Ical/s=4.178 w lly Langley)=lcal/cm cal/cm2 min=697.8 W/n 2021/2/22 Assessment of Climate/Change Impacts 14 of x
Chapter 3 2021/2/22 Assessment of Climate/Change Impacts 14 of x Calculation of Radiation • Radiant flux(J/s, W) • Radiant flux density(W/m2 ) • Radiation amount (W/m2 d or mon) • Unit conversion 1 cal = 4.187J 1J = 1Nm=2.78*10-7kw h=0.239cal 1cal/s=4.178 w 1ly(Langley)=1cal/cm2 1cal/cm2 min=697.8 W/m2
Chapter 3 Calculation of radiation General equation: J=Jo f(x) J: average radiation in a condition Jo: average radiation in an ideal condition F(x): function for atmosphere transparency 2021/2/22 Assessment of Climate/Change Impacts 15 of x
Chapter 3 2021/2/22 Assessment of Climate/Change Impacts 15 of x Calculation of Radiation General equation: J = Jo f(x) J: average radiation in a condition Jo: average radiation in an ideal condition F(x): function for atmosphere transparency