Physical Geography Lecture 04.5 - Earth's Atmosphere 101016

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Physical Geography
Lecture 4.5
EARTH’S ATMOSPHERE

Ready for a quick review?
1.What’s the difference between shortwave
and longwave electromagnetic radiation?
Which of these...

5.How are the Tropics of Cancer and
Capricorn related to Earth’s axial tilt?
6.How are the Arctic and Antarctic Circles
re...

How is insolation “processed” by
Earth’s atmosphere?

First, we need to ask:
What is the make-up of Earth’s
atmosphere?

Air is...where?
 Air has weight, it has
mass
 Air is attracted by
Earth’s gravity

Composition of the Atmosphere
 The atmosphere is composed of two
types of gases:
1. Those which generally do not change t...

Proportional Volume of Atmospheric Gases

Particulates in the Atmosphere

The Importance of Particulates
 Absorb and reflect sunlight
 This reduces the amount of sunlight that
reaches Earth’s su...

The Importance of Particulates
 They also act as condensation nuclei...

Condensation Nuclei
 Condensation nuclei are
necessary elements for the
formation of cloud droplets
 Without them, condi...

Vertical Structure of the Atmosphere

Thermal Structure of the Atmosphere
 Troposphere
 Temp. decreases with
increasing altitude (surface
warmed by the sun is...

Conduction
 Conduction is the
passing of heat from
molecule to molecule
by touch

Conduction
 Temperature is an expression
of molecular motion
 As one molecule bangs into
another, it makes the next one
...

Conduction in the Troposphere
 The sun’s radiation is absorbed at Earth’s
surface and reradiated upward as heat
 But air...

ELR
 The rate at which air temperature drops as
you rise through the Troposphere can be
roughly estimated:
 6.5ºC/1000 m...

Thermal Structure of the Atmosphere
 Troposphere
 Temp. decreases with
increasing altitude (surface
warmed by the sun is...

A Little Bit About the
Importance of Ozone…

The Ozone Hole

Thermal Structure of the Atmosphere
 Troposphere
 Temp. decreases with
increasing altitude (surface
warmed by the sun is...

Vertical Structure of the Atmosphere
 Ionosphere—begins in the
Mesosphere
 blocks extremely harmful short
wave radiation...

A little more review:
1.Why are most of Earth’s atmospheric
gases found near the surface?
2.Name 3 important variable-amou...

5.What is ozone? In which thermal layer of the
atmosphere is it found? How does it affect
temperatures within that layer?
...

Practice drawing the vertical structure of the
atmosphere diagram in a notebook
Watch a Khan Academy video (see the post
o...

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