Source: Journal of Geophysical Research-Solid Earth, doi:10.1002/jgrb.50182, 2013 http://onlinelibrary.wiley.com/doi/10.1002/jgrb.50182/abstract
Title: Multiple transition zone seismic discontinuities and low velocity layers below western United States
Authors: B. Tauzin and Y. Ricard: Laboratoire de Geologie de Lyon, Terre, Planetes, Environnement, Universite Lyon, Villeurbanne Cedex, France;
R.D. van der Hilst: Department of Earth, Atmospheric, and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, Massachusetts, USA;
G. Wittlinger: Institut de Physique du Globe de Strasbourg, Ecole et Observatoire des Sciences de la Terre, CNRS and Universite de Strasbourg, Strasbourg Cedex, France.
6. New global maps of surface ocean currents made from drifter data
The Global Drifter Program, which began in 1979 in the tropical Pacific Ocean, now spans the globe with a total of 1,250 sensors. Tracked from orbit by satellites the array provides a means to observe global near-surface ocean circulation patterns.
To create an improved representation of the global ocean near-surface currents Lumpkin and Johnson devised a new technique to analyze drifter records. Using 6-hourly drifter observations from 1979 to 2012 the authors isolated the drifter movement caused by near-surface currents. They then calculated the current properties on a 0.5 by 0.5 degree grid. Their approach was novel in that the data were analyzed in elliptical bins, with the shape of each ellipse representing the range of variab
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