Summary:

**Radiative Fluxes**

The net radiation at the surface is the sum of the net solar flux absorbed by the vegetation ("v") and the ground ("g"), minus the net longwave flux (positive toward the atmosphere). This can be expressed mathematically as:

Net Radiation = (S_v + S_g) - (L_v + L_g)

where:
- S_v is the net solar flux absorbed by the vegetation
- S_g is the net solar flux absorbed by the ground
- L_v is the net longwave flux from the vegetation
- L_g is the net longwave flux from the ground

This equation represents the balance between the incoming and outgoing radiative fluxes at the Earth's surface.