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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:

  META 3.2exp NRT META3.1exp DT META 2.0 DT
Constellation All satellites All satellites Two satellites Two satellites
DOI - 10.24400/527896/a01-2021.001 10.24400/527896/a01-2021.002 -
PRODUCT CHARACTERISTICS
Timeliness Near-Real-Time Delayed-time Delayed-time
Period 01/01/2018 - ongoing (with 15 days delay) 1993/01/01 - 2020/03/07 1993/01/01  - 2020/03/07
Geographical coverage Global
Delivery format 2 files (1 for cyclonic and 1 for anticyclonic) 3 files for each anticyclonic and cyclonic eddies :
            long, short and untracked,
1 file for all the period
Update Every day April 2021 December 2020
Product Page with handbook META3.2exp NRT META3.1exp DT META2.0 DT
INPUT DATA
Constellation All satellites All satellites Two satellites Two satellites
Origin of upstream products CMEMS Near-Real-Time CMEMS Delayed-Time C3S Delayed-Time C3S Delayed-Time
Input variable ADT (Absolute Dynamic Topography) SLA (Sea Level Anomaly)
PROCESSING
Preprocessing Lanczos filter with a Bessel window 2D
            (cutoff 700 km, order 1)
Lanczos filter 2D
(1000 km)
Identification Py 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 eddy Only one At least one
Shape error 70% -
Amplitude threshold 0.4 cm 1 – 45 cm
Tracking Py Eddy Tracker : association of eddies within a trajectory by contours’ overlap, virtual observations, subsetting Py Eddy Tracker : Management of short missing detection, land control, subsetting available for wanted areas or trajectory duration, research of candidates in a restricted area
Method Overlap between eddies Research for candidates in a restricted area
Land control - yes
Virtual observations Max of 4 consecutive virtual eddies Max of 3 consecutive virtual eddies
Minimum Lifetime 10 days 28 days
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