INSC 201 Lecture Notes - Lecture 2: Sunscreen, Sunburn, Water Vapor
24 Jan 2017
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Document Summary
Stratosphere~ 10-50km: ~20km- ozone (o3) begins to heat up this gas exists to protect from ionizing ultraviolet radiation from sun, temperature increases with altitude. Troposhpere~0-10km 80% of at(cid:373)osphere"s (cid:373)ass: weather occurs and planes fly in this layer. Types of em radiation from highest energy to lowest energy: uv, visible, ir. Higher energy to left and lower energy to right of spectrum: uv region higher in energy than violet (visible) light. Ir region is lower in energy than red (visible) light. The u(cid:374)"s em radiatio(cid:374) peaks at (cid:271)lue/gree(cid:374) (cid:272)olor i(cid:374) the visi(cid:271)le spe(cid:272)tru(cid:373: ~5500 c/9900f. The important change that occurs for sunlight inside the earth"s at(cid:373)osphere is the removal of high-energy uvc light that is highly damaging to life forms: ozone in the stratosphere effectively absorbs uvc light. Uvc light is completely absorbed by the atmosphere. Uvb light causes sunburn and is used for sunscreen ratings. Water vapor= 60% of natural greenhouse effect.
