HOW DO WE MEASURE CURRENTS (CURRENTLY) ?
A partnership between the USA (NASA) and France (CNES)
led to the launching of a satellite to study ocean currents. Since its launch
into Earth orbit during August 1992, the TOPEX/Poseidon satellite has mapped
topography--the barely perceptible liquid "hills" and "valleys"
that make up the ocean's surface. Oceanographers use ocean topography to study
and monitor the currents. One full cycle of data is taken every 10 days.
The following link takes you to a movie made using a simplified
ocean model by Professor Chelton at Oregon State University. The model shows
how the oceans respond to winds. The ocean model starts off revolving in the
center of the model basin but gradually the center of the spinning shifts
to the west. This shift is a result of the westward intensification of the
currents along the western edge of the model basin. This same westward intensification
occurs along the western edges of the Pacific, the Atlantic and the Indian
oceans. The theory for this intensification was worked out by a famous Oceanographer,
Dr Stommel in 1948. An example of this intensification is the
off the coast of North America. The movie file is very large (12 MB) so it
will take quite some time to download Currents
Questions that come to mind are:
Critical Thinking Questions:
If we were to build a solid causeway across the Pacific Ocean (I can't imagine this, but just pretend..) from Seattle (USA) to Tokyo (Japan), how would the surface currents in the North Pacific Ocean be affected and how might this affect the climate of Japan, Alaska, and California?
To find out the answers to these and other questions you may have, check out our " Helpful Links " !