Climate - Humidity, Indexes, Meteorology | Britannica

climate

Table of Contents

Introduction
Solar radiation and temperature
- Solar radiation
  - Distribution of radiant energy from the Sun
  - Effects of the atmosphere
  - Average radiation budgets
  - Surface-energy budgets
- Temperature
  - Global variation of mean temperature
  - Diurnal, seasonal, and extreme temperatures
  - Variation with height
  - Circulation, currents, and ocean-atmosphere interaction
  - Short-term temperature changes
Atmospheric humidity and precipitation
- Atmospheric humidity
  - Humidity indexes
    - Absolute humidity
    - Specific humidity
    - Relative humidity
  - Relation between temperature and humidity
  - Humidity and climate
    - Average relative humidity
    - Evaporation and humidity
- Precipitation
  - Origin of precipitation in clouds
    - Cloud formation
    - Cloud types
    - Mechanisms of precipitation release
    - Showers, thunderstorms, and hail
  - Types of precipitation
    - Drizzle
    - Rain and freezing rain
    - Snow and sleet
    - Hail
  - World distribution of precipitation
    - Regional and latitudinal distribution
    - Amounts and variability
  - Effects of precipitation
    - Raindrop impact and soil erosion
    - Surface runoff
Atmospheric pressure and wind
- Atmospheric pressure
- Wind
  - Relationship of wind to pressure and governing forces
  - Cyclones and anticyclones
    - Extratropical cyclones
    - Anticyclones
    - Cyclone and anticyclone climatology
  - Local winds
    - Scale classes
    - Local wind systems
  - Zonal surface winds
- Monsoons
  - Diurnal variability
  - Intra-annual variability
  - Interannual variability
- Upper-level winds
  - Characteristics
  - Propagation and development of waves
  - Relationships to surface features
  - Jet streams
  - Winds in the stratosphere and mesosphere
Climate and the oceans
- The ocean surface and climate anomalies
- Formation of tropical cyclones
  - Conditions associated with cyclone formation
  - Effects of tropical cyclones on ocean waters
  - Influence on atmospheric circulation and rainfall
- Poleward transfer of heat
  - Thermohaline circulation
  - The Gulf Stream
  - The Kuroshio
- El Niño/Southern Oscillation and climatic change
  - The El Niño phenomenon
  - The Southern Oscillation
Climate and life
- The Gaia hypothesis
- The evolution of life and the atmosphere
- The role of the biosphere in the Earth-atmosphere system
  - The biosphere and Earth’s energy budget
  - The cycling of biogenic atmospheric gases
  - Biosphere controls on the structure of the atmosphere
  - Biosphere controls on the planetary boundary layer
  - Biosphere controls on maximum temperatures by evaporation and transpiration
  - Biosphere controls on minimum temperatures
  - Climate and changes in the albedo of the surface
  - The effect of vegetation patchiness on mesoscale climates
  - Biosphere controls on surface friction and localized winds
  - Biosphere impacts on precipitation processes
    - Cloud condensation nuclei
    - Biogenic ice nuclei
    - Recycled rainfall
- Climate, humans, and human affairs

References & Edit History Related Topics

Images & Videos

What's the difference between weather and climate?

See how differing amounts of solar radiation at the poles and Equator affect Earth's climate and atmosphere

Average exchange of energy between the surface, the atmosphere, and space, as percentages of incident solar radiation (1 unit = 3.4 watts per square metre).

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Global distribution of mean annual evaporation (in centimetres).

diagram of the hydrologic cycle of water

Follow water in its many forms, from glaciers and clouds to freshwater rivers and saltwater oceans

See how water transforms between liquid, ice, and vapour in the water cycle

For Students

climate summary

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Absolute humidity is the vapour concentration or density in the air. If m_v is the mass of vapour in a volume of air, then absolute humidity d_v is simply d_v = m_v/ V, in which V is the volume and d_v is expressed in grams per cubic metre. This index indicates how much vapour a beam of radiation must pass through. The ultimate standard in humidity measurement is made by weighing the amount of water gained by an absorber when a known volume of air passes through it; this measures absolute humidity, which may vary from 0 gram per cubic ...(100 of 37038 words)

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