RADIATION BALANCE

1. RADIATION BALANCE MET 2101 CLIMATOLOGY

2. RADIATION BALANCE What Happens to the Solar Beams? What Affects Radiation? ULTRA VIOLET VISIBLE INFRARED

3. SOLAR BEAM IN THE UPPER ATMOSPHERE (STRATOSPHERE) UV VIS IR Much UV Absorbed by Ozone Visible & IR Pass through Ozone with little attenuation

4. SOLAR BEAM IN THE TROPOSPHERE Radiation reaching clouds Clear Sky Radiation Absorbed Reflected Absorbed Reflected Scattered Clouds Diffuse Diffuse Surface Direct The remaining energy goes several places: Solar Radiation Reaching Troposphere About 98% of the solar beam passes through the Stratosphere to the Troposphere The solar radiation is absorbed and scattered by the atmosphere. It is indirectly reflected by clouds or transmitted to the surface Radiation scattered by the atmosphere or clouds, but still reaching the surface is called DIFFUSE RADIATION It hits the surface from all directions The radiation that passes through without scattering (DIRECT RADIATION) is partially reflected by the surface Diffuse radiation is not reflected by surface. On average somewhat more than half passes through clear skies; the rest encounters clouds

5. Surface Heats Up with Radiation Thermal IR emitted from heated surface (land & water)

6. Surface Heats Up with Radiation Thermal IR gradually absorbed by clouds and atmosphere Clouds also reflect part of Thermal IR back down Thermal IR increases with daylight

7. Radiation Budget in Percent of Solar Input Energy