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PACIFIC PLATE

AUSTRALIAN PLATE. Te c t o n i c s. PACIFIC PLATE. 45 mm/yr. Lionel Carter NIWA. Wp 35 Mt/y. Sediment Supply. Uw 5 Mt/y. Wa 15 Mt/y. Lionel Carter NIWA. Going Hyperpycnal. In Cyclone Bola 40. 10 6 t discharged in 6 days. 2m thick fluid mud layer on continental shelf.

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PACIFIC PLATE

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  1. AUSTRALIAN PLATE Te c t o n i c s PACIFIC PLATE 45 mm/yr Lionel Carter NIWA

  2. Wp 35 Mt/y Sediment Supply Uw 5 Mt/y Wa 15 Mt/y Lionel Carter NIWA

  3. Going Hyperpycnal • In Cyclone Bola 40. 106 t discharged in 6 days. • 2m thick fluid mud layer on continental shelf. • Organisms smothered but recolonized 2 months later after mud dispersed Photograph by Dave Peacock GDC, August 2002 Lionel Carter NIWA

  4. Climate and sediment input - ENSO + + + Southern Oscillation Index + + + + + El Nino + + ? Major storm events from Lake Tutira Lionel Carter NIWA

  5. Shelf Currents From Chiswell, 2000 Lionel Carter NIWA

  6. Poverty Bay Circulation Scott Stephens, NIWA Lionel Carter NIWA

  7. Forced Circulation offshore onshore Scott Stephens, NIWA Lionel Carter NIWA

  8. Mud capture in shelf synclinal basins m 1 1 Lionel Carter NIWA

  9. Response of the deep ocean flux * MD2121 Lionel Carter NIWA

  10. Where to next? • How does climate affect sediment input? • How will future climate affect delivery? • Tectonic control on sediment input? • Hyperpycnal vs hypopycnal dispersal? • Is there distant transport of nutrients to e.g., Fe-limited fronts? Lionel Carter NIWA

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