Chapter 2 Observed global radiation budget (2) Spatial distributions TThe earth surface radiation budget (rg) 2021/2/22 Assessment of climate/change impacts 16of71
Chapter 2 2021/2/22 Assessment of climate/change impacts 16 of 71 Observed global radiation budget (2) Spatial distributions • The earth surface: radiation budget (Rg)
Chapter 2 Understanding of Greenhouse Effects Observed Global average temperature: 140C Question: How does greenhouse effect maintain it 2021/2/22 Assessment of climate/change impacts 17of71
Chapter 2 2021/2/22 Assessment of climate/change impacts 17 of 71 Understanding of Greenhouse Effects Observed: Global average temperature: 14oC Question: How does greenhouse effect maintain it ?
Chapter 2 Understanding of Greenhouse Effects absorbed solar radiation 342-107(30%)=235W/m Based on stefen -boltzman's law T=-190C Balance of incoming/outgoing energy with altitude: 5km(-1yoc) 2021/2/22 Assessment of climate/change impacts
Chapter 2 2021/2/22 Assessment of climate/change impacts 18 of 71 Understanding of Greenhouse Effects • Absorbed solar radiation: 342-107(30%)=235 W/m2 • Based on Stefen-Boltzman’s law T= -19oC • Balance of incoming/outgoing energy with altitude: 5km(-19oC)
Chapter 2 Understanding of Greenhouse Effects Explanation: The decreasing temperature with height The greenhouse effects 2021/2/22 Assessment of climate/change impacts 19of71
Chapter 2 2021/2/22 Assessment of climate/change impacts 19 of 71 Understanding of Greenhouse Effects Explanation: The decreasing temperature with height The greenhouse effects
Chapter 2 Energy budget Ideal surface. Rg-leE-p-a-M=c Rg- net radiation LE- latent heat P-sensible heat a- heat exchange downwards into soil M heat used for snow or ice melt 2021/2/22 Assessment of climate/change impacts 20of71
Chapter 2 2021/2/22 Assessment of climate/change impacts 20 of 71 Energy budget Ideal surface: Rg - LeE - P - A - M = 0 Rg– net radiation LE– latent heat P– sensible heat A– heat exchange downwards into soil M– heat used for snow or ice melt