Solar Radiation and the Atmosphere Basics of Solar

Solar Radiation and the Atmosphere

Basics of Solar Radiation The sun gives of energy (aka radiation) in all wavelengths of the electromagnetic spectrum. Some types are filtered by Earth’s atmosphere, like UV is by the ozone layer.

Where Does the Solar Energy Go? 30% total reflected & scattered back to space 5% scattered back to space 20% reflected from clouds 20% reflected by clouds & atmosphere 50% absorbed by Earth’s surface 5% reflected from surface

Air Mass Movement Air moves around within the atmosphere and gains or loses energy. Gaining or losing energy occurs via three processes: Conduction Convection Radiation

Process 1: Conduction occurs when an air mass comes in contact with a heat source. Conduction transfers energy through mediums (substances). Hot Air Cold Air Hot Ground

Process 2: Convection occurs when air masses of two different temperatures meet and mix (requires 2 mediums). Cold Air Warm Air Hot Air

Process 3: Radiation transfers energy by waves moving through space but there is no movement of the any particles (needs no mediums). This involves weak energy waves traveling in all directions from the original energy source.

Solar Radiation and Seasons The angle at which solar radiation reaches the Earth determines the seasons. Play the video and take notes.

Basics of Solar Radiation