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Geography – Fundamentals of Physical Geography

Composition and Structure of Atmosphere

Composition and Structure of Atmosphere

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Study Action Plan (Sorted by Difficulty)
Atmospheric Composition and Structure
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Difficulty Level:
High
Atmospheric Pressure and Wind Systems
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High
Climate Classification and Change
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High
Heat Budget and Temperature Distribution
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Precipitation and Hydrometeorological Processes
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Difficulty Level:
High

Learning Objectives

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Learning Objectives

  • Understand the composition and structure of the atmosphere, including the roles of gases, water vapour, and dust particles, and the characteristics of atmospheric layers such as the troposphere, stratosphere, mesosphere, thermosphere, and exosphere.
  • Analyze the heat budget and temperature distribution of the Earth, focusing on processes like insolation, conduction, convection, terrestrial radiation, and advection, and the factors influencing temperature distribution and inversion.
  • Examine atmospheric pressure and wind systems, including global pressure belts, planetary, seasonal, and local winds, and the dynamics of air masses, fronts, and cyclones.
  • Understand precipitation and hydrometeorological processes, including evaporation, condensation, and the formation of dew, frost, fog, mist, and clouds, as well as the types and distribution of rainfall globally.
  • Study climate classification and change, focusing on global climate classification systems such as Koeppen's, and the impacts of the greenhouse effect, global warming, and climate change on Earth's systems.

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Revision Notes & Summary

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Chapter Notes

Atmospheric Composition and Structure

  • Atmosphere: A mixture of gases, water vapour, and dust particles enveloping the Earth.
  • Gases: Major components include nitrogen, oxygen, carbon dioxide, and ozone.
    • Carbon Dioxide: Meteorologically important; transparent to solar radiation, opaque to terrestrial radiation, contributing to the greenhouse effect.
    • Ozone: Found between 10 and 50 km, absorbs ultraviolet rays.
  • Water Vapour: Variable gas, decreases with altitude, significant in heat retention.
  • Dust Particles: Include sea salts, soil, smoke, and pollen; act as nuclei for cloud formation.
  • Atmospheric Layers:
    • Troposphere: Up to 18 km at the equator, contains weather phenomena, temperature decreases with altitude.
    • Stratosphere: Contains the ozone layer, extends up to 50 km.
    • Mesosphere: Temperature decreases with altitude, extends up to 80 km.
    • Thermosphere: Contains ions, temperature increases with altitude.
    • Exosphere: Merges with outer space, very rarefied.

Heat Budget and Temperature Distribution

  • Heat Budget: Balance between incoming solar radiation and outgoing terrestrial radiation.
  • Temperature Distribution:
    • Influenced by latitude, altitude, and land-water contrast.
    • Temperature Inversion: Occurs when temperature increases with altitude, affecting weather patterns.

Atmospheric Pressure and Wind Systems

  • Pressure Belts: Global patterns of high and low pressure.
  • Wind Systems: Include planetary, seasonal, and local winds.
  • Cyclones:
    • Tropical Cyclones: Form over warm ocean waters, characterized by low pressure and high winds.
    • Extra-Tropical Cyclones: Occur in mid-latitudes, associated with fronts.

Precipitation and Hydrometeorological Processes

  • Precipitation: Includes rain, snow, sleet, and hail.
  • Processes: Evaporation, condensation, and cloud formation.
  • Types of Rainfall: Convectional, orographic, and frontal.

Climate Classification and Change

  • Koeppen's Classification: Categorizes world climates based on temperature and precipitation.
  • Climate Change:
    • Greenhouse Effect: Warming due to trapped heat by greenhouse gases.
    • Global Warming: Increase in Earth's average temperature, leading to climate changes.
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Practice Test – MCQs, True/False

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Multiple Choice Questions

A.

Oxygen

B.

Nitrogen

C.

Carbon dioxide

D.

Argon
Correct Answer: C

Solution:

Carbon dioxide is primarily responsible for the greenhouse effect as it absorbs and re-emits infrared radiation, contributing to global warming.

Chapter Concept:

Climate Classification and Change

A.

The convergence of polar easterlies and westerlies

B.

The sinking of air from the equatorial region

C.

The rising of warm air at the poles

D.

The influence of ocean currents
Correct Answer: B

Solution:

The subtropical high-pressure belt is primarily caused by the sinking of air that has risen at the equatorial region, leading to high pressure at the surface.

Chapter Concept:

Atmospheric Pressure and Wind Systems

A.

To increase the earth's temperature.

B.

To absorb ultraviolet radiation from the sun.

C.

To reflect all incoming solar radiation.

D.

To trap greenhouse gases.
Correct Answer: B

Solution:

The ozone layer absorbs ultraviolet radiation from the sun, protecting life on Earth from harmful UV rays.

Chapter Concept:

Atmospheric Pressure and Wind Systems

A.

Troposphere

B.

Stratosphere

C.

Mesosphere

D.

Exosphere
Correct Answer: B

Solution:

The stratosphere contains the ozone layer, which absorbs ultraviolet radiation, causing the temperature to increase with altitude.

Chapter Concept:

Atmospheric Composition and Structure

A.

Oxygen

B.

Nitrogen

C.

Carbon Dioxide

D.

Argon
Correct Answer: C

Solution:

Carbon dioxide is transparent to incoming solar radiation but opaque to outgoing terrestrial radiation, thus contributing to the greenhouse effect.

Chapter Concept:

Atmospheric Composition and Structure

A.

Environmental lapse rate

B.

Adiabatic lapse rate

C.

Temperature inversion

D.

Thermal gradient
Correct Answer: A

Solution:

The environmental lapse rate is the rate at which air temperature decreases with an increase in altitude. In this scenario, a decrease of 1°C per 165 meters is a typical environmental lapse rate.

Chapter Concept:

Heat Budget and Temperature Distribution

A.

Advection

B.

Temperature inversion

C.

Convection

D.

Conduction
Correct Answer: B

Solution:

Temperature inversion occurs when a layer of warm air traps cooler air near the surface, preventing it from rising. This can lead to cooler temperatures in valleys at night as the cold air is trapped.

Chapter Concept:

Heat Budget and Temperature Distribution

A.

Increase in global temperatures due to enhanced greenhouse effect

B.

Decrease in global temperatures due to increased albedo

C.

Significant warming of the stratosphere

D.

Rapid melting of polar ice caps
Correct Answer: B

Solution:

Volcanic eruptions release ash and sulfur dioxide, which can increase the Earth's albedo by reflecting sunlight away, leading to a temporary decrease in global temperatures.

Chapter Concept:

Atmospheric Pressure and Wind Systems

A.

90 km

B.

100 km

C.

120 km

D.

150 km
Correct Answer: C

Solution:

Oxygen is almost negligible at the height of 120 km in the atmosphere.

Chapter Concept:

Atmospheric Composition and Structure

A.

High atmospheric pressure and low sea surface temperature

B.

Low atmospheric pressure and high sea surface temperature

C.

High atmospheric pressure and high sea surface temperature

D.

Low atmospheric pressure and low sea surface temperature
Correct Answer: B

Solution:

Tropical cyclones intensify with low atmospheric pressure and high sea surface temperatures, as these conditions provide the necessary energy and moisture for the cyclone to strengthen.

Chapter Concept:

Atmospheric Pressure and Wind Systems

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Composition and Structure of Atmosphere

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True or False

Correct Answer: True

Solution:

The troposphere is indeed the layer where weather changes occur and it contains water vapour and dust particles, as it is the lowest layer of the atmosphere.

Chapter Concept :

Atmospheric Composition and Structure

Correct Answer: False

Solution:

Precipitation can occur in various forms including rain, snow, sleet, and hail, not just rainfall.

Chapter Concept :

Precipitation and Hydrometeorological Processes

Correct Answer: True

Solution:

Carbon dioxide allows solar radiation to pass through but traps outgoing terrestrial radiation, which contributes to the greenhouse effect.

Chapter Concept :

Atmospheric Composition and Structure

Correct Answer: True

Solution:

Koeppen's system classifies world climates based on temperature and precipitation patterns, which are key elements of climate.

Chapter Concept :

Climate Classification and Change

Correct Answer: False

Solution:

Ozone is primarily found in the stratosphere, not the troposphere, and it absorbs ultraviolet radiation.

Chapter Concept :

Atmospheric Composition and Structure

Correct Answer: True

Solution:

Carbon dioxide allows solar radiation to enter but traps outgoing heat, leading to global warming.

Chapter Concept :

Climate Classification and Change

Correct Answer: False

Solution:

Water vapour is a variable gas in the atmosphere, decreasing with altitude and varying by region, being more abundant in the warm and wet tropics than in cold and dry regions.

Chapter Concept :

Precipitation and Hydrometeorological Processes

Correct Answer: False

Solution:

Ozone is primarily found in the stratosphere, not the mesosphere, and it absorbs ultraviolet radiation.

Chapter Concept :

Atmospheric Composition and Structure

Correct Answer: True

Solution:

Koeppen's climate classification system is widely used for categorizing world climates by analyzing temperature and precipitation patterns.

Chapter Concept :

Climate Classification and Change

Correct Answer: False

Solution:

Dust particles are generally concentrated in the lower layers of the atmosphere, with higher concentrations in subtropical and temperate regions due to dry winds, not in equatorial and polar regions.

Chapter Concept :

Precipitation and Hydrometeorological Processes

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