However Sources of heat to our planet:

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Presentation transcript:

However Sources of heat to our planet: solar radiation 100 W m-2 geothermal inputs  0.05-0.2 W m-2 Tides (small) (from last lecture) The Ocean Circulation is generally considered to be forced by wind stress, heat and freshwater fluxes at the sea surface. However

Estimates of the Effects of Geothermal Heating on the mean temperature profiles in the World Ocean

Atlantic Ocean Indian Ocean Changes in the Vertical Circulation of the Ocean (Thermohaline Circulation) Atlantic Ocean Indian Ocean

Why ocean bathymetry?

TODAY Review of ocean physiography -skip How do we measure bathymetry? Why is ocean bathymetry important?

The Physiography of the North Atlantic Ocean Floor http://topex.ucsd.edu continental margins deep ocean basins midoceanic ridges

The Physiography of the North Atlantic Ocean Floor

Type of continental margins

Passive Margin

Transport of sediments from the shelf to the continental rise

Transform faults and Fracture zones

Hydrothermal Vents

How do we measure bathymetry?

What does it mean to be at an altitude of 4000 m? It mean that I am 4000 m above the Mean Sea Level (MSL)

Model of the shape of the Earth geoid: The equipotential surface of the Earth's gravity field which best fits, in a least squares sense, global mean sea level (MSL) http://www.esri.com/news/arcuser/0703/geoid1of3.html

The height of the Earth surface

Why ocean bathymetry?

Ocean Circulation and Climate Heat Transport affected by topography!

Ocean Circulation and Climate Ocean Currents take different paths!

Ocean Circulation and Climate Deep ocean mixing and pathways

Ocean Circulation and Climate Mixing energy and dissipation of tides!

Ocean Circulation and Biology Seamounts ….

Societal impacts Tsunami

Societal impacts Gas and oil extraction

Before you go … Due next Wed. Sept. 6, 2006 1) Reading material on Class Website http://www.o3d.org/eas-4300/index.cgi?lectures.html Satellite Topography and Oceanography from Space 2) Homework #2 assigned. http://www.o3d.org/eas-4300/index.cgi?homeworks.html Due next Wed. Sept. 6, 2006

Understanding Isostacy and Buoyancy Exercise

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