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Long-range temporal correlations of ocean surface currents Yosef Ashkenazy1

Summary: Long-range temporal correlations of ocean surface currents
Yosef Ashkenazy1
and Hezi Gildor2
Received 9 December 2008; revised 14 April 2009; accepted 7 May 2009; published 10 September 2009.
[1] We study the temporal correlations of sea surface currents at the Gulf of Eilat
(also known as Gulf of Aqaba) and find long-range temporal correlations, from a timescale
of several hours to a timescale of several months. This is done using the Fourier
transform and the Detrended Fluctuation Analysis methods. We also find weak volatility
correlations that indicate nonlinearity of surface currents. We use the time-dependent
surface Ekman layer model to test whether the source of these correlations is the wind. It is
found that the wind by itself actually leads to stronger temporal correlations than observed,
as well as enhanced diurnal periodicity; other nonlinear terms as well as tides, convection,
and spatial variability may weaken the temporal correlations imposed by the wind. Our
results show significant spatial variability of correlation exponents even in this small
region (6 10 km); in addition, stronger correlations are observed during winter.
Citation: Ashkenazy, Y., and H. Gildor (2009), Long-range temporal correlations of ocean surface currents, J. Geophys. Res., 114,
C09009, doi:10.1029/2008JC005235.
1. Introduction
[2] Temporal long-range correlations have been detected
in many geophysical time series [e.g., Mandelbrot and


Source: Ashkenazy, Yossi "Yosef" - Department of Solar Energy and Environmental Physics, Jacob Blaustein Institutes for Desert Research,Ben-Gurion University of the Negev
Gildor, Hezi - Institute of Earth Sciences, Hebrew University of Jerusalem


Collections: Environmental Management and Restoration Technologies; Environmental Sciences and Ecology; Geosciences; Physics