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Tropical Instability Vortices: a major control of the Pacific and Atlantic ecosystems

Tropical Instability Vortices: a major control of the Pacific and Atlantic ecosystems. Christophe Menkes, P. Flament , S. C. Kennan, Y. Dandonneau, E. Marchal, M. Landry, J. Vialard, G. Champalbert, M.-H. Radenac, P. Dutrieux, O. Aumont, P. Lehodey.

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Tropical Instability Vortices: a major control of the Pacific and Atlantic ecosystems

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  1. Tropical Instability Vortices: a major control of the Pacific and Atlantic ecosystems Christophe Menkes, P. Flament, S. C. Kennan, Y. Dandonneau, E. Marchal, M. Landry, J. Vialard, G. Champalbert, M.-H. Radenac, P. Dutrieux, O. Aumont, P. Lehodey

  2. TIW are readily visible in most dynamical and biological fields as cusp-like shapes of strong fronts. • Major process of the Equatorial Atlantic and Pacific at ~1000 km and monthly scales.

  3. SST Chl SLA 2001 2000 1999 1998 • Propagate westward at ~30-60 km/day . • Mainly during boreal summer-fall as the surface currents: the SEC, the EUC and the NEC are strong and prone to develop barotropic and/or baroclinic instabilities.

  4. PICOLO situation in June 1997 in the Atlantic ocean TIWE situation in November 1989 In the Pacific Ocean • TIWs are often associated with anticyclonic eddies ~500 km diameter with typical surface speeds of ~1m/s. These vortices are seen to shape the surface properties.

  5. PICOLO ATLANTIC situation TIWE PACIFIC situation

  6. PICOLO ATLANTIC DATA VERTICAL SECTION Picolo data

  7. TIWE DATA. VERTICAL SECTION

  8. TIWE DATA IN THE PACIFIC OCEAN

  9. CLIPPER model SST SSS W T S

  10. CLIPPER SST AVHRR SST

  11. Clipper model typical drifter trajectory Plans for TIV observations in The Pacific in 2004: French-US collaboration, a 2-ship experiment:

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