pacific plate
DESCRIPTION
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. - PowerPoint PPT PresentationTRANSCRIPT
PACIFICPLATE
45 mm/yr
AUSTRALIANPLATET
ectonics
Lionel Carter NIWA
Wp 35 Mt/y
Uw 5 Mt/y
Wa 15 M
t/y
Sediment
Supply
Lionel Carter NIWA
Going Hyperpycnal
In Cyclone Bola 40. 106 t discharged in 6 days.
2m thick fluid mud layeron continental shelf.
Organisms smothered but recolonized 2 months later after mud dispersed
Photograph by Dave Peacock GDC, August 2002
Lionel Carter NIWA
Climate and sediment input - ENSO
Major storm events from Lake Tutira
El Nino
Sou
ther
n O
scill
atio
n In
dex
+
+
++
++
+
+
+
+
?
Lionel Carter NIWA
Shelf
Currents
From Chiswell, 2000
Lionel Carter NIWA
25.4
25.5
25.6
25.7
25.8
25.9
26
26.1
26.2
26.3
26.4
WaipaoaRiver
10 cm/s
Velocity and Density, 10m, 17 Sep 98
De
nsi
ty (
kg m
-3)
Scott Stephens, NIWA
Poverty Bay
Circulation
Lionel Carter NIWA
Scott Stephens, NIWA
onshore
offs
hore
Forced
Circulation
Lionel Carter NIWA
m
Mud capture in shelf synclinal basins
1
1
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Response of the deep ocean flux
*MD2121
Lionel Carter NIWA
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