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EOS spotlight research: New surface ocean current maps created from drifter data

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FanZhang 发表于 2013-7-19 08:35:13 | 显示全部楼层 |阅读模式
New surface ocean current maps created from drifter data

EOS spotlight research
http://www.aoml.noaa.gov/phod/dac/LumpkinJohnson2013_preprint.pdf

The Global Drifter Program, which began
in 1979 in the tropical Pacific Ocean, now
spans the globe with a total of 1250 sensors.
Tracked from orbit by satellites, the array
provides a way 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° grid. Their approach was novel
in that the data were analyzed in elliptical
bins, with the shape of each ellipse representing
the range of variability of the surface
currents observed within that bin. The
authors modeled both seasonal variations
and interannual changes caused by the
El Niño– Southern Oscillation. In this way
the authors were able to compile monthly
climatologies for each bin, visually representing
not just the mean current speed but also
its variability. Knowing the variability for each
model bin gives an indication of the importance
of both mean and eddy- driven currents
in each region.
In their model the authors were able to
represent many of the world’s major ocean
currents. They captured the seasonal cycle
in current behavior, along with patterns and
seasonal shifts in near- surface eddies.
(Journal of Geophysical Research- Oceans,
doi:10.1002/ jgrc.20210, 2013) —CS
915983428 发表于 2013-7-21 23:20:32 | 显示全部楼层
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