Sagar Kumar presented on how temperature varies with altitude in the different layers of the atmosphere. The presentation covered the four main layers - troposphere, stratosphere, mesosphere, and thermosphere - and explained that temperature either increases or decreases with altitude depending on the characteristics of each layer. In the troposphere, temperature decreases with altitude due to being farther from the Earth's surface. In the stratosphere, temperature increases with altitude due to ozone absorbing UV light. The mesosphere cools with altitude due to fewer gas molecules, while the outer thermosphere heats with altitude from sunlight ionizing oxygen atoms.

1. 4/3/2019 Environment 1

2. Presentation
Topic: How Temperature Varies With Altitude.
Presented By: Sagar Kumar
Assigned by: Prof: Dr. Aamna Balouch
National Centre Of Excellence in
Analytical Chemistry University of
Sindh Jamshoro
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3. Content:
• Introduction to Atmosphere
• Layers Of Atmosphere
• How Temperature Varies with Altitude in
• Troposphere
• Stratosphere
• Mesosphere
• Thermosphere
• References
• Acknowledgement
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4. What is Earth’s atmosphere?
• The atmosphere is the mixture of gases that
surrounds Earth.
• Functions of the atmosphere:
• Protects organisms from the sun’s damaging
UV rays
• Maintains the right temperature range for life.
• Supplies gases necessary for breathing.
The Atmosphere
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5. The layers of the Atmosphere
What are the layers of the atmosphere?
• Divided into 4 layers:
• Troposphere
• Stratosphere
• Mesosphere
• Thermosphere
The Atmosphere
• Layers are separated based on:
• How temperature varies with altitude
• Composition of gases
• Density
• Air pressure within the layer.
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6. Temperature: how does T vary with altitude?
• The change in temperature
depends upon the
characteristics of the
atmospheric layer that is being
measured.
• In some atmospheric layers,
the T increases in altitude,
while in other layers, it
decrease.
The Atmosphere
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7. Troposphere
• The layer closest to the Earth.
• As altitude increases,
• The air gets colder (T decreases)
• The air gets thinner (density
decreases)
• Less force is exerted (air pressure
decreases as there are fewer numbers
of air molecules)
• Weather happens here
• Layer where most organisms on Earth live
• How is the troposphere heated?
• Radiation from the Earth’s surface.
Therefore, the further away from the
Earth’s surface, the colder it gets.
The Atmosphere
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8. Stratosphere
• The layer above the
troposphere.
• As altitude increases,
the air pressure and
density decrease
• Air Temperature: increases with increasing altitude
(different than the troposphere). Why?
• The stratosphere contains the ozone layer.
• Ozone molecules absorb ultraviolet light and give off
heat as the molecules are formed and broken apart.
The Atmosphere
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9. Mesosphere
• The layer above the stratosphere.
• The gases become thinner, or less
dense, with altitude.
• Temperatures decrease with increasing
altitude:
• Why? There are fewer gas
molecules to absorb radiation from
the sun.
The Atmosphere
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10. Thermosphere
• The layer above the mesosphere
• Oxygen (as we breathe it, O2)
breaks up into individual oxygen
atoms.
• The individual atoms are easily
heated by radiation from the
sun: this causes the
temperature to increase with
increasing altitude.
• Aurora lights occur in this layer.
The Atmosphere
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11.  Atmospheric Pressure Chemical
Ionization (APCI), Operators manual.
 Wikipedia
REFERENCES:
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12. I am thankful to Almighty Allah for His divine support .
I am also thankful to Prof. Dr. Amna Baloch
Acknowledgment
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13. 4/3/2019 Environment 13