Global mesoscale eddy trajectory product

Mesoscale Eddy Trajectory Atlas Product

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

	META3.2 DT		META 3.2exp NRT
Constellation	All satellites	Two satellites	All satellites
DOI	10.24400/527896/a01-2022.005.220209	10.24400/527896/a01-2022.006.220209	-
PRODUCT CHARACTERISTICS
Timeliness	Delayed-time		Near-Real-Time
Period	1993/01/01 - 2022/02/09		01/01/2018 - ongoing (with 15 days delay)
Geographical coverage	Global
Delivery format	3 files for each anticyclonic and cyclonic eddies : long, short and untracked,		2 files (1 for cyclonic and 1 for anticyclonic)
Update	3-4 times per year		Every day
Product Page with handbook	META3.2 DT		META3.2exp NRT
INPUT DATA
Constellation	All satellites	Two satellites	All satellites
Origin of upstream products	CMEMS Delayed-Time version 2021	C3S Delayed-Time version DT2021	CMEMS Near-Real-Time
Input variable	ADT (Absolute Dynamic Topography)
PROCESSING
Preprocessing	Lanczos filter with a Bessel window 2D (cutoff 700 km, order 1)
Identification	Py Eddy Tracker algorithm (collaboration with E. Mason) Provide Eddy position, Speed and Effective Radius, Amplitude, associated contours, speed profile
Number of extrema in one eddy	Only one
Shape error	70%
Amplitude threshold	0.4 cm
Tracking	Py Eddy Tracker : association of eddies within a trajectory by contours’ overlap, virtual observations, subsetting
Method	Overlap 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

	DOI	Period covered	Product page with handbook
META 3.1exp DT	10.24400/527896/a01-2021.001 for allsat version 10.24400/527896/a01-2021.002 for twosat version	1993/01/01/ - 2020/03/07	product page
META 3.0exp NRT	-	2018/01/01 -	product page
META 2.0 DT (not recommended)	-	1993/01/01 - 2020/03/07	product page

Data