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Mesoscale Eddy Trajectories Atlas Product

Several versions of the Mesoscale Eddy Trajectories Atlas are available to users. The main characteristics of each version are described below, the details are on each product page:

 META3.1exp DTMETA 3.0exp NRTMETA 2.0 DT
ConstellationAll satellitesTwo satellitesAll satellitesTwo satellites
Period1993/01/01 - 2020/03/0701/01/2018 - ongoing (with 15 days delay)1993/01/01  - 2020/03/07
Geographical coverageGlobal
Delivery format3 files for each anticyclonic and cyclonic eddies :
            long, short and untracked,
2 files (1 for cyclonic and 1 for anticyclonic)1 file for all the period
UpdateApril 2021Every dayDecember 2020
Product Page with handbookMETA3.1exp DTMETA3.0exp NRTMETA2.0 DT
ConstellationAll satellitesTwo satellitesAll satellitesTwo satellites
Origin of upstream productsCMEMS Delayed-TimeC3S Delayed-TimeCMEMS Near-Real-TimeC3S Delayed-Time
Input variableADT (Absolute Dynamic Topography)SLA (Sea Level Anomaly)
PreprocessingLanczos filter with a Bessel window 2D
            (cutoff 700 km, order 1)
Lanczos filter with a Bessel window 2D
(cutoff 500 km, order 3)
Lanczos filter 2D
(1000 km)
IdentificationPy Eddy Tracker algorithm (collaboration with E. Mason)
Provide Eddy position, Speed and Effective Radius, Amplitude, associated contours, speed profile
Oregon State University algorithm (collaboration with D. Chelton) 
Provide Eddy position, Speed Radius, Amplitude
Number of extrema in one eddyOnly oneAt least one
Shape error70%55%-
Amplitude threshold0.4 cm1 – 45 cm
TrackingPy Eddy Tracker : association of eddies within a trajectory by contours’ overlap, virtual observations, subsettingPy Eddy Tracker : Management of short missing detection, land control, subsetting available for wanted areas or trajectory duration, research of candidates in a restricted area
MethodOverlap between eddiesResearch for candidates in a restricted area
Land control-yes
Virtual observationsMax of 4 consecutive virtual eddiesMax of 3 consecutive virtual eddies
Minimum Lifetime10 days28 days
Rss feedsContactPartnersFAQLexiconMobile
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