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Feedback Mechanisms & Consequences of Global Warming. Lecture 10.8 Chapter 19 (pp.534-540). VIDEO: What About Carbon in Soils & Permafrost?. CO2 and Forest Growth-The Duke University Study. GW Consequences. Wild Organisms/Plants Missed Circadian Rythms Increased range Decreased Range

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feedback mechanisms consequences of global warming

Feedback Mechanisms & Consequences of Global Warming

Lecture 10.8

Chapter 19 (pp.534-540)

gw consequences
GW Consequences
  • Wild Organisms/Plants
    • Missed Circadian Rythms
    • Increased range
    • Decreased Range
    • Increased Pests
  • Humans
    • Emerging Diseases
    • Economics
      • Timber
      • Tourism
    • Cultural
      • S. Pacific
      • Inuit
  • Melting
    • Polar Ice Caps
    • Glaciers
    • Permafrost
  • Rising Sea levels
  • Increased Heat Waves
  • Decreased Cold Spells
  • Altered Precipitation Patterns
  • Increased Storm Intensity
  • Changes to Ocean Currents
melting polar ice
Melting Polar Ice

(1979-v-2000)

positive feedback
Positive Feedback
  • Melting Polar Ice has positive feedback
    • Increased melting decreases ice, which decreases albedo leading to further warming LIKEWISE
    • Seawater is dark so absorbs more heat and melts more ice
melting glaciers
Melting Glaciers

1957

1998

Meltwater?

slide10

1976

2000

rising sea levels
Rising Sea Levels
  • Sea level rise caused in 2 ways
    • Thermal Expansion-Water expands as it warms
    • Melting of Land ice Adds Volume to World’s Oceans
increased heat waves
Increased Heat Waves
  • French heat toll almost 15,000
decreased cold spells
Decreased Cold Spells
  • Cite two reasons why this is a benefit to humans
  • Cite two ways this could be a negative for humans
altered precipitation patterns
Altered Precipitation Patterns
  • Some areas will get more water, some areas will have greater drought
  • Net Effect: EXTREMES wetter-dryer-hotter-colder
changes to ocean currents
Changes to Ocean Currents
  • Glacial meltwater (freshwater) could disrupt the thermohaline circulation
gw consequences1
GW Consequences
  • Wild Organisms/Plants
    • Missed Circadian Rythms
    • Increased range
    • Decreased Range
    • Increased Pests
  • Humans
    • Emerging Diseases
    • Economics
      • Timber
      • Tourism
    • Cultural
      • S. Pacific
      • Inuit
  • Melting
    • Polar Ice Caps
    • Glaciers
    • Permafrost
  • Rising Sea levels
  • Increased Heat Waves
  • Decreased Cold Spells
  • Altered Precipitation Patterns
  • Increased Storm Intensity
  • Changes to Ocean Currents
pack ice is habitat
Pack Ice Is Habitat
  • Zooplankton in parts of California Current have decreased by 80% since 1951
    • Effecting entire food chain
  • Decline in krill around Antarctica
    • Caused decrease in penguin populations
ranges change
Ranges Change
  • Species have shifted their geographic range
effects on organisms coral reefs
Effects on Organisms - Coral Reefs
  • Coral reefs can be bleached (right) due to increase in water temperature
    • Affects coral symbiotes and makes them more susceptible to diseases to which they would otherwise be immune
effects on human health
Effects on Human Health
  • Increased number of heat-related illnesses and deaths
diseases on the rise
Diseases on the Rise
  • Malaria
  • West Nile
  • EEE
  • Dengue Fever
economic effects
Economic Effects

Where will Skiing Tourism go?

cultural impacts
Cultural Impacts
  • Eskimo Inuit live traditional life dictated by freezing climate
  • Climate change is altering their existence
    • Wildlife are smaller or displaced
    • Reduced snow cover and shorter river ice seasons
the climate change controversy
The Climate Change Controversy
  • Is it real (in relation to geologic time)
  • Is it necessarily bad?
  • Known: GG concentrations are increasing
  • 2007 IPCC Report on Expectations to Come