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Lecture 4

ENVIRSC 1A03 Lecture Notes - Lecture 4: Shortwave Radiation, Outgoing Longwave Radiation


Department
Environmental Science
Course Code
ENVIRSC 1A03
Professor
Luc Bernier
Lecture
4

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Why is the Poleward Heat Transport?
- Surplus energy moves toward poles (deficit regions) --> done through warm moist air, warm
sea water
- Poleward heat transport is a driving force of climate
Poleward Heat transport and the Oceans
- Water moves heat to the poles
- moving from solid to liquid to gas --> bonds broken
Hydrologic Cycle
- function is to transfer latent heat --> evaporation, precipitation, runoff
Greenhouse Effect
- warming is occurring due to presence of: greenhouse gases --> CO2, methane, nitrous oxide
- without greenhouse gases, Earth would be frozen
- the green house gases capture earth's infrared energy and emit it back to the earth
- Venus has an abundance of green house gases --> CO2, there is a much stronger effect on
Venus
Global Energy Balance
- incoming solar shortwave radiation is balanced by outgoing longwave radiation
- Energy absorbed by Earth - Energy absorbed at the surface = Energy recycled within the
Earth system
If water vapor was no longer present in the atmosphere:
- How would Earth's energy budget be affected? --> less energy would be emitted back to the
Earth, hence there will be a net gain of radiation --> will be losing more energy to space
- Explain why an increase in cloud covering surrounding Earth would:
increase Earth's albedo yet not necessarily lead to a lower earth surface temperature? --> there
will be high albedo in the upper layers (cloud to space), but the cloud cover will also absorb and
emit Earth's own radiation back
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