Kundali IQHome › Exam notes › UPSC Civil Services › Climatology
Climatology
Geography
Useful for: UPSC Civil Services, OSSC RHT — Regular High School Teacher, OSEPA Upper Primary — Arts, OSSC Geography, OSSSC Govt TGT Arts, SSB Lecturer (Degree Colleges), SSB TGT Arts
Overview
The atmosphere is layered by temperature; the Earth’s heat budget balances incoming solar radiation with outgoing terrestrial radiation.
Key points
- Composition: nitrogen about 78%, oxygen about 21%, argon about 0.93%, carbon dioxide about 0.04%.
- Troposphere: weather layer, average height about 13 km (about 8 km at poles, 18 km at the equator); temperature falls with height.
- Stratosphere contains the ozone layer; temperature rises with height.
- Mesosphere is the coldest layer; meteors burn up there; the thermosphere contains the ionosphere that reflects radio waves.
- Albedo is the fraction of radiation reflected; fresh snow has high albedo.
- Over a year the Earth radiates as much energy as it receives (heat budget balance).
Explanation
- Temperature inversion: temperature rises with height near the ground, trapping pollutants (common on winter nights).
- Greenhouse gases absorb outgoing long-wave radiation.
- Insolation is highest near the tropics, not exactly at the equator, due to clouds.
- Conduction, convection, advection and radiation transfer heat.
- Jet streams flow near the tropopause.
Step by step
- Identify the concept, law or fact asked.
- Recall the definition, formula, example or year.
- Apply it and eliminate mismatched options.
Examples
- Statement: "The ozone layer lies mainly in the troposphere." → Incorrect (stratosphere).
- Statement: "The troposphere is thicker at the equator than at the poles." → Correct.
- Statement: "Temperature inversions trap pollutants near the ground." → Correct.
Traps and advanced points
- Trap: Placing ozone in the troposphere.
- Trap: Saying the mesosphere is warmest.
- Trap: Reversing albedo meaning.
Quick revision
- N₂ 78, O₂ 21, Ar 0.93, CO₂ 0.04.
- Ozone in stratosphere.
- Troposphere 8–18 km.
Practice MCQs
From the perspective of definition and scope, which one of the following statements about Atmosphere & Heat Budget is correct?
- Atmosphere & Heat Budget is unrelated to institutions, processes or real-world applications.
- Atmosphere & Heat Budget has no exceptions or limitations in exam analysis.
- Incoming short-wave solar radiation and outgoing long-wave terrestrial radiation are central to Earth’s heat budget.
- The greenhouse effect is caused primarily by the atmosphere reflecting all incoming solar radiation back to space.
Read chapter notes · Similar questions
Show answer
Answer: (c) Incoming short-wave solar radiation and outgoing long-wave terrestrial radiation are central to Earth’s heat budget.. Incoming short-wave solar radiation and outgoing long-wave terrestrial radiation are central to Earth’s heat budget.
Consider the following statements on Atmosphere & Heat Budget and Geomorphology, focusing on definition and scope: 1. The greenhouse effect is caused primarily by the atmosphere reflecting all incoming solar radiation back to space. 2. Weathering necessarily involves transportation of the weathered material away from the site. Which of the statements given above is/are correct?
- 1 only
- 2 only
- Both 1 and 2
- Neither 1 nor 2
Read chapter notes · Similar questions
Show answer
Answer: (d) Neither 1 nor 2. Neither statement is correct; both are common misconceptions.
With reference to Atmosphere & Heat Budget (definition and scope), consider the following statements: 1. Greenhouse gases absorb and re-emit parts of terrestrial radiation, warming the lower atmosphere. 2. The greenhouse effect is caused primarily by the atmosphere reflecting all incoming solar radiation back to space. Which of the statements given above is/are correct?
- 1 only
- 2 only
- Both 1 and 2
- Neither 1 nor 2
Read chapter notes · Similar questions
Show answer
Answer: (a) 1 only. Only statement 1 is correct.
Consider the following statements on Atmosphere & Heat Budget, focusing on practical application: 1. Latitudinal energy imbalance drives atmospheric and oceanic circulation. 2. Incoming short-wave solar radiation and outgoing long-wave terrestrial radiation are central to Earth’s heat budget. Which of the statements given above is/are correct?
- 1 only
- 2 only
- Both 1 and 2
- Neither 1 nor 2
Read chapter notes · Similar questions
Show answer
Answer: (c) Both 1 and 2. Both statements are correct.
From the perspective of working mechanism, which one of the following statements about Atmosphere & Heat Budget is correct?
- The lithosphere is broken into plates moving over the weaker asthenosphere.
- Alluvial soils are widespread in river plains but vary in age and texture.
- Greenhouse gases absorb and re-emit parts of terrestrial radiation, warming the lower atmosphere.
- Dynamic map facts should be cross-checked against current official maps where boundaries or designations matter.
Read chapter notes · Similar questions
Show answer
Answer: (c) Greenhouse gases absorb and re-emit parts of terrestrial radiation, warming the lower atmosphere.. Greenhouse gases absorb and re-emit parts of terrestrial radiation, warming the lower atmosphere.
With reference to Atmosphere & Heat Budget (institutional design), consider the following statements: 1. The greenhouse effect is caused primarily by the atmosphere reflecting all incoming solar radiation back to space. 2. Albedo influences how much incoming radiation is reflected. Which of the statements given above is/are correct?
- 1 only
- 2 only
- Both 1 and 2
- Neither 1 nor 2
Read chapter notes · Similar questions
Show answer
Answer: (b) 2 only. Only statement 2 is correct.
With reference to Atmosphere & Heat Budget (definition and scope), consider the following statements: 1. The greenhouse effect is caused primarily by the atmosphere reflecting all incoming solar radiation back to space. 2. Albedo influences how much incoming radiation is reflected. Which of the statements given above is/are correct?
- 1 only
- 2 only
- Both 1 and 2
- Neither 1 nor 2
Read chapter notes · Similar questions
Show answer
Answer: (b) 2 only. Only statement 2 is correct, so the answer is (B) 2 only. Statement 1 is incorrect — it is an overstated or wrong claim. Correct position: Greenhouse gases absorb and re-emit parts of terrestrial radiation, warming the lower atmosphere. Statement 2 is correct.
Consider the following statements on Atmosphere & Heat Budget, focusing on institutional design: 1. Albedo influences how much incoming radiation is reflected. 2. Latitudinal energy imbalance drives atmospheric and oceanic circulation. Which of the statements given above is/are correct?
- 1 only
- 2 only
- Both 1 and 2
- Neither 1 nor 2
Read chapter notes · Similar questions
Show answer
Answer: (c) Both 1 and 2. All the given statements are correct, so the answer is (C) Both 1 and 2. Both statements are correct.
Consider the following statements on Atmosphere & Heat Budget and Mapping & Location Logic, focusing on working mechanism: 1. The greenhouse effect is caused primarily by the atmosphere reflecting all incoming solar radiation back to space. 2. Map-based elimination is impossible unless the candidate memorizes exact coordinates of every place. Which of the statements given above is/are correct?
- 1 only
- 2 only
- Both 1 and 2
- Neither 1 nor 2
Read chapter notes · Similar questions
Show answer
Answer: (d) Neither 1 nor 2. None of the given statements is correct, so the answer is (D) Neither 1 nor 2. Neither statement is correct; both are common misconceptions.
With reference to Atmosphere & Heat Budget (working mechanism), consider the following statements: 1. Albedo influences how much incoming radiation is reflected. 2. The greenhouse effect is caused primarily by the atmosphere reflecting all incoming solar radiation back to space. Which of the statements given above is/are correct?
- 1 only
- 2 only
- Both 1 and 2
- Neither 1 nor 2
Read chapter notes · Similar questions
Show answer
Answer: (a) 1 only. Only statement 1 is correct, so the answer is (A) 1 only. Statement 1 is correct. Statement 2 is incorrect — it is an overstated or wrong claim. Correct position: Greenhouse gases absorb and re-emit parts of terrestrial radiation, warming the lower atmosphere.
More topics in this chapter
Notes and questions are written by Kundali IQ for practice. They are not official papers; always check the latest official notification for the syllabus and pattern.