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11. WORLD CLIMATE AND CLIMATE CHANGE

The chapter explores world climate and climate change, focusing on Koeppen's climate classification scheme, which categorizes climates based on temperature and precipitation. It discusses the historical context of climate fluctuations, the significance of greenhouse gas emissions, and their contribution to global warming. It emphasizes the need for international cooperation in addressing climate change through initiatives like the Kyoto Protocol.

Sections

WORLD CLIMATE AND CLIMATE CHANGE

The section discusses the classification of world climate through empirical, genetic, and applied approaches.

11 Section Overview

Start current section content and materials

11.1 KOEPPEN'S SCHEME OF CLASSIFICATION OF CLIMATE

Koeppen's climate classification scheme relates vegetation distribution to climate based on temperature and precipitation.

11.1.1 Group (A): Tropical Humid Climate

Tropical humid climates are characterized by high temperatures and significant rainfall throughout the year, with three main types: wet, monsoon, and wet-dry.

11.1.1.1 Tropical Wet Climate (Af)

The Tropical Wet Climate (Af) is characterized by high temperatures and significant rainfall throughout the year, primarily found near the equator.

11.1.1.2 Tropical Monsoon Climate (Am)

The Tropical Monsoon Climate (Am) is characterized by heavy rainfall in summer, dry winters, and is found primarily in regions such as the Indian subcontinent and parts of Australia.

11.1.1.3 Tropical Wet and Dry Climate (Aw)

The Tropical Wet and Dry Climate (Aw), characterized by distinct wet and dry seasons, lies adjacent to tropical wet climates and is marked by variable rainfall and high temperatures.

11.1.2 Group (B): Dry Climate

This section delves into Koeppen's climate classification, highlighting 'B - Dry Climates', characterized by low rainfall insufficient for vegetation growth.

11.1.2.1 Subtropical Steppe (BSh) and Subtropical Desert (BWh) Climates

This section elaborates on subtropical steppe (BSh) and subtropical desert (BWh) climates, detailing their precipitation and temperature characteristics as well as their distinctions.

11.1.2.2 Warm Temperate (Mid-Latitude) Climates (C)

Warm temperate climates, identified by Koeppen's classification, are characterized by warm summers and mild winters, divided into four distinct types.

11.1.2.3 Humid Subtropical Climate (Cwa)

The humid subtropical climate (Cwa) is characterized by hot summers and mild winters, with rainfall distributed throughout the year.

11.1.2.4 Mediterranean Climate (Cs)

The Mediterranean climate, classified as Cs in Koeppen's system, features hot, dry summers and mild, wet winters, typically found in subtropical latitudes.

11.1.2.5 Humid Subtropical (Cfa) Climate

The Humid Subtropical climate, classified as Cfa, features no dry season with warm summers, found predominantly in areas like the eastern United States and parts of East Asia.

11.1.2.6 Marine West Coast Climate (Cfb)

The Marine West Coast Climate (Cfb) is characterized by mild temperatures, consistent precipitation throughout the year, and a limited seasonal temperature variation.

11.1.3 Cold Snow Forest Climates (D)

Cold snow forest climates occur in the northern hemisphere at latitudes 40°-70° and can be divided into two types based on their winter conditions.

11.1.3.1 Cold Climate with Humid Winters (Df)

This section discusses the characteristics and significance of the 'Cold Climate with Humid Winters' (Df) classification under Koeppen's climate classification system.

11.1.3.2 Cold Climate with Dry Winters (Dw)

The 'Cold Climate with Dry Winters' (Dw) is characterized by extremely low temperatures for much of the year, with significant temperature variations between seasons and minimal summer precipitation.

11.1.4 Polar Climates (E)

Polar climates, which exist beyond 70° latitude, consist of tundra and ice cap climates characterized by extreme cold and minimal vegetation.

11.1.4.1 Tundra Climate (ET)

The Tundra climate (ET) is characterized by low-growing vegetation, permafrost, and long daylight hours during summer.

11.1.4.2 Ice Cap Climate (EF)

The Ice Cap Climate (EF) is characterized by perpetually freezing temperatures and minimal precipitation, typically found in polar regions such as Greenland and Antarctica.

11.1.5 Highland Climates (H)

Highland climates are characterized by significant temperature fluctuations over short distances due to elevation and diverse precipitation patterns.

11.2 CLIMATE CHANGE

Climate change is a continuous process driven by both natural events and human activities, with significant effects on weather patterns and natural ecosystems.

11.2.1 Climate in the Recent Past

This section explores the variability of climate in the recent past, highlighting notable weather events and discussing the causes of climate fluctuations from both natural and anthropogenic perspectives.

11.2.2 Causes of Climate Change

This section outlines the various causes of climate change, categorizing them into astronomical and terrestrial causes, and particularly emphasizes the impact of greenhouse gases.

11.2.2.1 Volcanism

Volcanism is a geological process that significantly influences climate and environment through eruptions, affecting solar radiation and atmospheric conditions.

11.2.3 Global Warming

This section discusses global warming, the greenhouse effect, greenhouse gases, their impact, and international efforts to combat climate change.

11.2.3.1 Greenhouse Gases (GHGs)

Greenhouse gases (GHGs) such as CO2, CFCs, and CH4 play a crucial role in global warming by trapping heat in the atmosphere.

11.3 EXERCISES

This section presents various exercises focused on climate classification, specifically the Koeppen classification system.

Learning Objectives

  • Koeppen's classification scheme identifies five major climatic groups based on temperature and precipitation.

  • Historical records suggest that climate change is a natural, continuous process affected by both astronomical and anthropogenic factors.

  • Global warming, primarily caused by greenhouse gases, has significant environmental impacts, including rising sea levels and altered weather patterns.

Key Concepts

Koeppen Climate Classification

A system that classifies climate into five major groups based on temperature and precipitation, correlating with vegetation distribution.

Greenhouse Gases

Gases that trap heat in the atmosphere, leading to the greenhouse effect, which is primarily caused by human activities.

Global Warming

The long-term rise in Earth's average surface temperature due to human-induced increases in greenhouse gases.

Practice Exercises

Total Questions

4

Estimated Time

8 min

Passing Score

70%

Instructions

  • Read each question carefully
  • You can use hints if you need help
  • Complete all questions before submitting