Regions identified as important for implementing a South Atlantic observing system for climate

1. PIRATA backbone + extensions ifM - INPE AX98 ATLAS buoy IfM – SIO (Russia) AX18 GEF GOOD HOPE + BONUS Regions identified as important for implementing a South Atlantic observing system for climate • The light blue shading indicates the high eddy kinetic energy regions in the Brazil/Malvinas Confluence and the Agulhas Retroflection. Light orange shading indicate the regions of convection and subduction. Light green shading areas of upwelling associated to the shallow tropical cells. Red lines depict areas of interest for monitoring the inter-ocean exchanges and the bifurcation of the South Equatorial Current. Purple line near 30°S region for monitoring the meridional mass and heat flux

2. Primary production in the western South Atlantic • Recent changes in chl-a are among the largest observed (>50%, Gregg et al., 2005) • Primary production shelf break front 1.9 to 7.8 gC m2 d-1 (Garcia et al., in preparation) • F (CO2) = - 5.7 mmol CO2 m2 d-1(Bianchi et al., 2005)

3. ARGAU

4. - 5.7 mmol m-2 d-1 -30 matm DpCO2 FCO2 Ocean productivity and CO2 fluxes Chlorophyll-a

5. GEF PATAGONIA

6. Pre-deployment set-up

7. High resolution sampling mode

8. Swimmers

9. Estimates of South Atlantic Meridional Heat Flux

10. Estimates of South Atlantic Meridional Heat Flux

11. Lagrangian reconstruction of the global Thermohaline Circulation Median pathways between successive oceanic sections crossed by water parcels. The colors indicate the mean depth of the transfer between two given sections. The North Atlantic overturning is defined here as the thermocline waters (in orange, red and pink) transformed into NADW (blue) in the North Atlantic sector. Numbers quantify the mass transfers between successive control sections (the Atlantic Equator, the Drake Passage, the SO section south of Australia and the Indonesian Throughflow). Speich et al. 2007, submitted

12. Estimates of South Atlantic Meridional Heat Flux

13. High-resolution XBT line AX18 (14 sections) Garzoli & Baringer 2007, submitted

14. Meridional heat flux – meridional structure Integrated from 80ºN Garzoli & Baringer 2007, submitted

15. Meridional heat flux – model comparisons Integrated from 80ºN

16. Structure of meridional flow – (some) error sources “observed” thermal wind Courtesy from Baher & Marotzke, in prep.

17. UPCOMING WORKSHOP A monitoring system for heat and mass transports in the South Atlantic as a component of the Meridional Overturning Circulation Estancia San Ceferino, Buenos Aires Argentina, May 8 - 10, 2007 To establish the feasibility of and to foster collaborations for a monitoring system for meridional heat and mass transports in the South Atlantic and inter-ocean exchanges as a component of the Meridional Overturning Circulation. 25 participants from: South Africa UK Uruguay USA Argentina Brazil France Germany Russia