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Danish Galathea 3 cruise 2006-2007

Interaction of physical, chemical and biological processes in atmosphere-ocean CO 2 exchange in the Benguela upwelling.

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Danish Galathea 3 cruise 2006-2007

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  1. Interaction of physical, chemical and biological processes in atmosphere-ocean CO2 exchange in the Benguela upwelling Lise Lotte Sørensen1, Katherine Richardson3,4, Merete B. Christiansen2, Jesper Nissen2, Søren Lund2, Lars Christensen2, Jørgen Bendtsen1, Karen Marie Hilligsøe1,3 and Lone Mouritsen3 1National Environmental Research Institute, University of Aarhus, Denmark 2Risø-DTU, Denmark 3University of Aarhus, Denmark 4Copenhagen University

  2. Since the world became industrialized in 1750 the atmospheric level of CO2 has risen from 270 ppm to 380 ppm. In the same period the ocean has absorbed nearly 50% but in upwellings areas CO2 is emitted back. As global warming increases coastal trade winds enhances (Mcgregor 2004) Does this mean more CO2 is emitted back to the atmosphere making enhanced coastal winds an positive climate feedback process ?

  3. Danish Galathea 3 cruise 2006-2007

  4. ΔpCO2 measurements • FCO2= SCO2 kCO2pCO2, Measurements of partial pressure of CO2 in Sea water and in the atmosphere using an equilibrator. Sea water is taken from continous inlet

  5. Direct mesaurements of the flux of CO2 and detailed meteorology

  6. High Chlorophyll concentration at 6:00

  7. Upwelling zones: CO2 release SOURCE outward crossing high chlorophyl concentration SINK

  8. Upwelling zones: CO2 release

  9. Atmospheric boundary layers

  10. Conclusions • Clearly the interaction between the atmosphere and ocean in terms of heat exchange and physical forcing is important to the CO2 fluxes. • Detailed description of the atmospheric flow and energy fluxes in the coastal areas are important in order to understand and estimate the CO2 fluxes in coastal upwelling regions

  11. Acknowledgement THANK YOU for your attention and THANKS to: • Danish Expeditionfond • Willum Kann Rasmussen • Nordea Fonden • FNU • Knud Højgårds Fond • Risø-DTU • the crew on the ship ”VÆDDEREN”

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