PHY2505 Lecture 18

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PHY2505 - Lecture 18

• Radiation and Climate

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Overview

• This lecture
• Review of Liou
• IPCC definitions of radiative forcing
• Next lecture
• 1-D radiative-convective climate models
• IPCC results
• Final lecture
• Climate and planetary atmospheres

3
Review

• Chapter 2 3 4 4 8
• Solar variability Solar absorption Thermal
  RT modelling Satellite observation
• scattering absorption
  retrieval
  aerosol emission
• atmospheric
• gases

RADIATIVE FORCINGS
OBSERVATION/VALIDATION
Intergovernmental Panel on Climate Change
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Solar variability

• Diurnal latitudinal variation
  Measurement Structure

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Solar absorption scattering

• Solar absorption bands Rayleigh
  scattering Radiative transfer
  equation
• Mie scattering
• Characteristics of aerosols

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Thermal absorption emission

• Spectroscopy line shape
  Radiative transfer equation

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IPCC

• Formed under WMO and UNEP in 1988 to deal with
  potential global climate change
• Working Group I assesses the scientific aspects
  of the climate system and climate change.
• Working Group II assesses the vulnerability of
  socio-economic and natural systems to climate
  change, negative and positive consequences of
  climate change, and options for adapting to it.
• Working Group III assesses options for limiting
  greenhouse gas emissions and otherwise mitigating
  climate change.
• The Task Force on National Greenhouse Gas
  Inventories is responsible for the IPCC National
  Greenhouse Gas Inventories Programme.

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IPCC major findings

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IPCC radiative forcings

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IPCC radiative forcings

• What is the IPCC definition of radiative forcing?
• Sensitivity parameter

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IPCC Global warming potential

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IPCC Global warming potential

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IPCC Global warming potential

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IPCC Global warming potential