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Looper trajectory segments in Global Drifter Program data

Looper trajectory segments

Version number: 2.0. Most recent data included: 2 July 2017. Created on: 7 December 2017. Documentation: Lumpkin (2016) .

On this page, you'll find looper trajectory segments identified from Global Drifter Program data, using the methodology documented in Lumpkin (2016) J. Geophys. Res.

The data is available as a Matlab file loopers.mat which contains the following variables:

T_L: integral time scale from velocity correlation function (days).
drogue: drogue presence (1=drogued, 0=undrogued, .5=uncertain).
id: unique identification number.
lat: latitude (degrees; negative = south).
lon: longitude (degrees; negative = west).
omega: spin omega (s^-1)
period: period of rotation (days; =2 pi / omega).
perFit: period from velocity correlation function (days).
persist: persistence of looping (days).
radius: orbital radius (m).
t: time (days since 1/1/1979).
u: zonal velocity (m/s).
v: meridional velocity (m/s).

There is also a Matlab file nonloopers.mat which contains the data of non-looping drifters, for those variables which are defined for nonloopers.

If you wish to obtain these data in a different format, contact Rick Lumpkin .