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Mesoscale Eddy Trajectory Atlas Product

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

 META4.0 DTMETA 3.2exp NRT
PRODUCT CHARACTERISTICS
PROCESSING
INPUT DATA
INPUT DATA
ConstellationAll satellitesAll satellites
DOI10.24400/527896/a01-2026.001-
TimelinessDelayed-timeNear-Real-Time
Period1993/01/01 - 2023/09/0801/01/2018 - ongoing (with 15 days delay)
Geographical coverageGlobal
Delivery format2 files (1 for cyclonic and 1 for anticyclonic)
UpdateEvery yearEvery day
Product Page with handbookMETA4.0 DTMETA3.2exp NRT
ConstellationAll satellitesAll satellites
Origin of upstream productsCMEMS Delayed-Time version 2021CMEMS Near-Real-Time
Input variableADT (Absolute Dynamic Topography)
PreprocessingRaw ADT (without filtering)Lanczos filter with a Bessel window 2D
 (cutoff 700 km, order 1)
IdentificationPy Eddy Tracker algorithm (collaboration with E. Mason)
Provide Eddy position, Speed and Effective Radius, Amplitude, associated contours, speed profile
Number of extrema in one eddyOnly one
Shape error70%
Amplitude threshold0.4 cm
TrackingPy Eddy Tracker: association of eddied within a network by contours' overlap, detection of merging and splitting eventsPy Eddy Tracker : association of eddies within a trajectory by contours’ overlap, virtual observations, subsetting
MethodOverlap between eddies
Land control-
Virtual observations-Max of 4 consecutive virtual eddies
Minimum Lifetime-10 days

List of past versions which are not updated anymore

 DOIPeriod coveredProduct page with handbookLast update 
META 3.2 DT10.24400/527896/a01-2022.005 for allsat version
10.24400/527896/a01-2022.006 for twosat version		1993/01/01/ - 2022/02/09product page 
META 3.1exp DT10.24400/527896/a01-2021.001 for allsat version
10.24400/527896/a01-2021.002 for twosat version		1993/01/01/ - 2020/03/07product page 
META 3.0exp NRT-2018/01/01 - product page 
META 2.0 DT (not recommended)-1993/01/01 - 2020/03/07product page 
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