Outgoing Longwave Radiation Radiation that is emitted by features on earth – Water – Clouds – Land surface – Infrared spectrum of energy.

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Presentation transcript:

Outgoing Longwave Radiation Radiation that is emitted by features on earth – Water – Clouds – Land surface – Infrared spectrum of energy

Connection to Stefan-Boltzmann E = energy radiating in W m -2 (Typical units of OLR) = emissivity (if a blackbody = 1) = Stefan-Boltzmann Constant = x W m -2 K -4 T = Temperature Example: If a surface has a temperature of -10 o C and is a perfect blackbody, how much energy would it radiate?

Connection to Stefan-Boltzmann E = energy radiating in W m -2 (Typical units of OLR) = emissivity (if a blackbody = 1) = Stefan-Boltzmann Constant = x W m -2 K -4 T = Temperature Example: If a surface has a temperature of -10 o C and is a perfect blackbody, how much energy would it radiate? E = (1) * ( x W m -2 K -4 ) * (-10 o C ) = W m -2

Connection to Stefan-Boltzmann Which of these features has the highest and lowest outgoing longwave radiation?

Connection to Stefan-Boltzmann Which of these features has the highest and lowest outgoing longwave radiation? 310 K300 K280 K 200 K

Connection to Stefan-Boltzmann Which of these features has the highest and lowest outgoing longwave radiation? 310 K300 K280 K 200 K

How does OLR change over the earth

Tropical Cyclones

How does OLR change over the earth

ITCZ ICE Desert Dry Anticyclone

Climate Maps: Yearly Cycle Questions to think about: – Which location undergoes the largest change in OLR over the year? – Highest OLR? – Lowest OLR? – Can you explain the distribution?

Climate Maps: Yearly Cycle

OLR Differences between El Nino and La Nina enso_cycle.shtml enso_cycle.shtml Related to Changes in the Walker Circulation!

Show Differences between El Nino and La Nina El Nino

Show Differences between El Nino and La Nina La Nina

Show Differences between El Nino and La Nina Difference

This Year

Other Factors that influence OLR Madden Julian Oscillation

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