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Ankur Desai, UW-Madison AOS 405, 6 Feb 2008

Carbon Dioxide, Friend or Foe?. Ankur Desai, UW-Madison AOS 405, 6 Feb 2008. The terrestrial carbon cycle and a climate for life on Earth. Outline. Overview Science at the boundaries A climate for change The land carbon cycle A climate for life Who stole my sink? Some case studies

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Ankur Desai, UW-Madison AOS 405, 6 Feb 2008

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  1. Carbon Dioxide, Friend or Foe? Ankur Desai, UW-Madison AOS 405, 6 Feb 2008 The terrestrial carbon cycle and a climate for life on Earth

  2. Outline • Overview • Science at the boundaries • A climate for change • The land carbon cycle • A climate for life • Who stole my sink? • Some case studies • ChEAS <chEEz> • ACME 2007 • Conclusion • CO2, Friend or Foe?

  3. OVERVIEW

  4. Overview • Lots of good science at the boundaries • Land-ocean-atmosphere interaction is a good example • Transfer of energy, mass, momentum have large uncertainty • And large effects on meteorology and climate • Atmospheric perspective spans fields of micrometeorology, boundary layer meteorology, oceanography, and biophysics

  5. Overview • Carbon Dioxide • 0.04% of atmosphere, but quite important

  6. Overview • CO2 and climate are closely linked

  7. Overview • A climate for change

  8. THIS CLIMATE FUTURE OVER THE NEXT 100 YEARS IS HIGHLY DEPENDENT ON:1) HUMAN ACTIVITIESAND THE RESPONE OF THE…

  9. LAND CARBON CYCLE

  10. Land Carbon Cycle • Process of photosynthesis of land and ocean plants makes life possible on this planet • CO2 + H2O + light -> Carbohydrate + O2 + heat • Metabolism of carbohydrates and oxygen by plants and animals completes the loop

  11. Land Carbon Cycle

  12. Land Carbon Cycle

  13. Land Carbon Cycle

  14. Land Carbon Cycle

  15. Land Carbon Cycle • Atmospheric CO2 growth not constant • more variable than rate of increase in fossil fuel • Land and ocean sources/sinks • complex feedbacks • affected by episodic (volcano) and oscillatory (ENSO) events • Where’s the sink?

  16. Land Carbon Cycle

  17. Land Carbon Cycle • Missing sink… (Sarmiento et al, 2002)

  18. Land Carbon Cycle

  19. Land Carbon Cycle

  20. Land Carbon Cycle • Peters et al, 2007

  21. Land Carbon Cycle • Courtesy of NTSG, U. Montana

  22. Land Carbon Cycle • Sanders et al, 2002

  23. Land Carbon Cycle • Friedlingstein et al, 2005 • Who stole my sink?

  24. Land Carbon Cycle

  25. Land Carbon Cycle

  26. Land Carbon Cycle • Fluxnet

  27. CASE STUDIES

  28. Case Study: ChEAS

  29. Case Study: ChEAS

  30. Case Study: ChEAS

  31. Case Study: ChEAS

  32. Case Study: ChEAS

  33. Case Study: ChEAS

  34. Case Study: ACME 2007

  35. Case Study: ACME 2007

  36. Case Study: ACME 2007

  37. Case Study: ACME 2007

  38. Case Study: ACME 2007

  39. Case Study: ACME 2007 CO2 MORNING UPWIND AFTERNOON DOWNWIND

  40. CONCLUSION

  41. Conclusions • Future climate change dependent on how we manage the atmospheric carbon cycle • Land-atmosphere interaction strongly implicated in controlling atmospheric CO2 growth rates • Big picture is understood but the devil is in the details • Lots of interdisciplinary science needed • CO2, Friend or Foe? You decide…

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