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Antarctic Circumpolar Current

Antarctic Circumpolar Current. NADW. AABW. Circulation of Deep Waters in Southern Ocean. 50ºS ACC 65ºS. Antarctic Circumpolar Current (ACC) flows eastward and extends from surface into the Deep Sea. N-S Cross Sections Atlantic Ocean . 3.

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Antarctic Circumpolar Current

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  1. Antarctic Circumpolar Current NADW AABW

  2. Circulation of Deep Waters in Southern Ocean 50ºS ACC 65ºS Antarctic Circumpolar Current (ACC) flows eastward and extends from surface into the Deep Sea

  3. N-S Cross Sections Atlantic Ocean 3

  4. Zonal (E-W) Cross Sections (at 7ºS) in Atlantic Ocean 4

  5. N-S Cross Sections in the Pacific Ocean 5

  6. Zonal (E-W) Cross Sections (30ºS) in Pacific Ocean 6

  7. North-South Cross Sections in Indian Ocean 7

  8. T and S in Atlantic versus Pacific Oceans

  9. Nitrate Trends in Deep Sea Atlantic Ocean Southern Ocean Pacific Ocean (umol/kg)

  10. Oxygen Trends in Deep Sea Atlantic Ocean Southern Ocean Pacific Ocean (umol/kg)

  11. CFC History in the Atmosphere 11

  12. CFCs in the N. Atlantic Ocean N-S Cross Section (1988) E-W Cross Section at 10ºN (1993) 12

  13. Theoretical Circulation for Deep Waters

  14. CFC Ages of Water Parcels in Deep Atlantic (~3000m) Years

  15. CFCs in Pacific Ocean

  16. Aging Deep Water using Radiocarbon (14C) 12C = 99% 13C= 1% 14C = 10-10 % Radioactive Decay Equation Nt = No * e-λt , where t = time and λ = 0.69/t½ t½ (half-life) = 5700 years for 14C Nt/No = e-λt or ln (Nt/No) = - λt Time (t) = -5700 yrs/0.69 * ln(Nt/No)

  17. 14C Distribution in Deep Sea 0 1000 1000 2000 3000 4000 5000 6000 (per mil)

  18. Interbasin Trends in 14C in Deep Sea

  19. Ocean’s Uptake of Fossil-fuel Combustion CO2 Ocean adsorbs about one-third of the CO2 produced by fossil fuel combustion

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