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Surprisingly high anthropogenic CO 2 in the eastern Mediterranean

Surprisingly high anthropogenic CO 2 in the eastern Mediterranean. A. Schneider, T. Tanhua, A. Körtzinger, D.W.R. Wallace. Thermohaline circulation. Meteor 51/2 in 2001. Salinity, Temperature, Oxygen Dissolved inorganic carbon Total alkalinity CFC-12. Thyrranian Sea.

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Surprisingly high anthropogenic CO 2 in the eastern Mediterranean

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  1. Surprisingly high anthropogenic CO2 in the eastern Mediterranean A. Schneider, T. Tanhua, A. Körtzinger, D.W.R. Wallace

  2. Thermohaline circulation

  3. Meteor 51/2 in 2001 • Salinity, Temperature, Oxygen • Dissolved inorganic carbon • Total alkalinity • CFC-12 Thyrranian Sea

  4. Transit time distribution (TTD) CFC-12 concentrations • TTD with a mean age Atmospheric history of CO2 + TTD • Anthropogenic carbon (Cant) Mean age

  5. Results

  6. Total Cant Inventories Mediterranean Sea compared to World Ocean: • 0.3 % of the water volume • 1.1 % of the Cant

  7. Hypothesis Why is the uptake higher? • Low Revelle Factor (9-10) • Deep water formation

  8. Conclusions • CFC-12 and Cant have penetrated the entire water column • High Cant inventories • Deep water formation areas are of great importance • Influence on the global ocean • Measurements in the marginal seas are needed

  9. Flux calculations • Good agreement with Huertas et al. 2009 using the ΔC* method: +4.2 Tg C yr-1 • Aït-Ameur & Goyet using the TrOCA method: opposite flux

  10. Cant Column Inventories from Waugh et al. 2006

  11. Age2 Age3 Age1 Transit time distribution (TTD) Age2 Age3 Age1

  12. Transit time distribution (TTD) • CFC-12 concentrations • atmospheric history • assumptions for saturation and mixing

  13. Transit time distribution (TTD) Mean age

  14. Transit time distribution (TTD) You get: Anthropogenic Carbon (Cant) 120 110 100 90 Anthropogenic CO2 [ppm] 80 70 60 50

  15. Transit time distribution (TTD)

  16. Transit time distribution (TTD)

  17. Mean age = 30 yrs Width = 45 Width = 0.1 Width = 30 Width = 1 Width = 10

  18. Width = 30 Mean age = 30 Width = 15 Mean age = 30

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