Introductory Climate Modeling

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# Introductory Climate Modeling - PowerPoint PPT Presentation

Introductory Climate Modeling. Presented by Dr. Robert MacKay Clark College physics and meteorology [email protected] Earth in space. See the first 4 videos at: http://earthobservatory.nasa.gov/Experiments/PlanetEarthScience/GlobalWarming/GW.php

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### Introductory Climate Modeling

Presented by Dr. Robert MacKay

Clark College physics and meteorology

[email protected]

Earth in space

See the first 4 videos at:

http://earthobservatory.nasa.gov/Experiments/PlanetEarthScience/GlobalWarming/GW.php

These are a very nice introduction to radiation from Earth and Sun.

Earth in space

The rate of Solar energy absorption by Earth is

pR2*(1-a)So where

a is the mean planetary albedo

So is the solar constant ~1365 W/m2

The mean emission rate for terrestrial (longwave) radiation is

4pR2*sT4 where

s=5.67x10-8 W/m2/K4

T is Earth’s mean annual temperature

Earth in space

Setting absorption equal to emission gives

pR2*(1-a)So =4pR2*sT4

or

This is about 33 K lower than Earth’s mean surface temperature of 288 K

A “flat” earth with an atmosphere that absorbs no solar radiation but absorbs all long-wave radiation coming from Earth’s surface. Both the earth’s surface and the atmosphere are assumed to be black bodies for longwave radiation. The atmosphere emits radiant energy equally towards and awy from Earth’s surface.

S

This is about 15 K higher than Earth’s mean surface temperature of 288 K

A “flat” earth with an atmosphere that absorbs no solar radiation but absorbs all long-wave radiation coming from Earth’s surface. Both the earth’s surface and the atmosphere are assumed to be black bodies for longwave radiation. The atmosphere emits radiant energy equally towards and awy from Earth’s surface.

S

Atmosphere absorbs a fraction, g ,of the total solar radiation absorbed by the planet

Atmosphere absorbs a fraction, e of all long-wave radiation coming from Earth’s surface. Through Kirchoff’s radiation law the emissivity of the atmosphere for long-wave radiation equals its absorptivity.

Earth’s surface is assumed to be a black bodies for long-wave radiation.

The atmosphere emits radiant energy equally towards and away from Earth’s surface.

Estimating g=0.29 and e=0.9 from Khiel and Trenberth Energy Balance diagram

A “flat” earth with an atmosphere that absorbs no solar radiation but absorbs all long-wave radiation coming from Earth’s surface. Both the earth’s surface and the atmosphere are assumed to be black bodies for longwave radiation. The atmosphere emits radiant energy equally towards and awy from Earth’s surface.

This is about 3.5 K lower than Earth’s mean surface temperature of 288 K

Estimating g=0.29 and e=0.9 from Khiel and Trenberth Energy Balance diagram

A “flat” earth with an atmosphere that absorbs no solar radiation but absorbs all long-wave radiation coming from Earth’s surface. Both the earth’s surface and the atmosphere are assumed to be black bodies for longwave radiation. The atmosphere emits radiant energy equally towards and awy from Earth’s surface.

Thermal Inertia Of Oceans

A Area of surface

d depth of ocean mixed layer

C specific heat capacity of oceans

r the density of water

If d=100 m

http://www.atmosedu.com/Geol390/physlets/GEBM/EBMGame.htm

http://www.atmosedu.com/Geol390/physlets/GEBM/ebm.htm

Stella version: http://www.atmosedu.com/WSU/esrp310-550/Activities/Gebm.STM

Feedbacks

http://www.thesystemsthinker.com/tstcld.html

http://www.atmosedu.com/ENVS109/PP/CausalLoopDiagramsA.ppt

Diagram from VUE.

Visual Understanding environment

Conclusions
• Simple conceptual climate models can help students learn about climate modeling and the climate system.
• Climate models of all sort provide Interactive engagement opportunities for students.
• Causal loop diagrams offer an excellent visual communication tool for both student and instructor.