Earth s energy atmosphere system
This presentation is the property of its rightful owner.
Sponsored Links
1 / 24

Earth’s energy - atmosphere system PowerPoint PPT Presentation


  • 54 Views
  • Uploaded on
  • Presentation posted in: General

Earth’s energy - atmosphere system. Earth’s energy inputs. Solar 174,000 terrawatts. Geothermal 23 terrawatts. Tidal 3 terrawatts. Outline. Radiation basics Interactions of radiation with the atmosphere Net radiation Heat fluxes Energy budget. 1. Radiation basics.

Download Presentation

Earth’s energy - atmosphere system

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


Earth s energy atmosphere system

Earth’s energy - atmosphere system


Earth s energy inputs

Earth’s energy inputs

Solar

174,000 terrawatts

Geothermal

23 terrawatts

Tidal

3 terrawatts


Outline

Outline

  • Radiation basics

  • Interactions of radiation with the atmosphere

  • Net radiation

  • Heat fluxes

  • Energy budget


1 radiation basics

1. Radiation basics


Radiation basics

Radiation basics


Radiation basics1

Radiation basics

Electromagnetic radiation

  • Described by:

  • Energy emitted (I) – W/m2

  • Wavelength (l) - mm


Radiation laws

Radiation laws

Stefan-Boltzman law:

Amount of radiation emitted by an object is proportional to temperature of the object

I = s T4

Where s = Stefan Boltzman constant

T = temperature (Kelvin)


Radiation laws1

Radiation laws

Wien’s law:

Wavelength of radiation emitted by an object is inversely proportional to temperature of the object

l = c / T

Where c = constant (2897)

T = temperature (Kelvin)


Radiation basics2

Radiation basics

Solar radiation

= shortwave

Terrestrial radiation

= longwave


Radiation basics3

Radiation basics

Radiation pathways


Radiation basics4

Radiation basics

The role of surface reflectance


Radiation basics5

Radiation basics

The role of clouds


2 interactions of radiation with the atmosphere

2. Interactions of radiation with the atmosphere


Structure of the atmosphere

Structure of the atmosphere

Ionosphere

Ozonesphere


Structure of the atmosphere1

Structure of the atmosphere

Ionosphere

Ozonesphere


Structure of the atmosphere2

Structure of the atmosphere

See text, page 55, figure 2.4


Net radiation at earth s surface

Net radiation at earth’s surface


Net radiation

Rn = SW - SW - LW + LW

Net radiation

The sum of all incoming and outgoing radiation at earth’s surface, represented by shortwave and longwave radiation

SW = shortwave (solar radiation)

LW = longwave (terrestrial radiation)


4 global heat fluxes

4. Global heat fluxes


Heat fluxes

Heat fluxes

Represents expenditures of net radiation at the earth’s surface

Sensible heat – energy absorbed in the warming of surfaces

Latent heat – energy absorbed to evaporate water

Ground heat – energy absorbed into the ground surface

Metabolism – energy required to drive metabolic processes (photosynthesis)


5 energy budget

5. Energy Budget


Earth s energy atmosphere system

Energy budget

Radiation inputs and heat fluxes must balance


Summary

Summary

  • All objects emit electromagnetic radiation

    • Energy directly proportional to temperature

    • Wavelength inversely proportional to temperature

  • Various interactions with electromagnetic radiation occur in atmosphere

    • Ionosphere filters out harmful xrays, gamma rays

    • Ozonosphere (stratosphere) filters out ultraviolet rays

    • Water vapor and carbon dioxide in troposphere absorb longwave radiation


Summary continued

Summary (continued)

  • Net radiation

    - Represents the sum of radiation inputs and losses from solar and terrestrial sources

  • Heat fluxes

    - Includes sensible heat, latent heat, ground heat and metabolic fluxes

  • Energy budget

    - general framework dictating that net radiation and heat fluxes must balance


  • Login