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The new DUACS DT2014 reprocessed products have been available since April2014. Numerous innovative changes have been introduced at each step of anextensively revised data processing protocol. The use of a new 20-yearaltimeter reference period in place of the previous 7-year referencesignificantly changes the sea level anomaly (SLA) patterns and thus has astrong user impact. The use of up-to-date altimeter standards and geophysicalcorrections, reduced smoothing of the along-track data, and refined mappingparameters, including spatial and temporal correlation-scale refinement andmeasurement errors, all contribute to an improved high-quality DT2014 SLAdata set. Although all of the DUACS products have been upgraded, this paperfocuses on the enhancements to the gridded SLA products over the globalocean. As part of this exercise, 21 years of data have been homogenized,allowing us to retrieve accurate large-scale climate signals such as globaland regional MSL trends, interannual signals, and better refined mesoscalefeatures. An extensive assessment exercise has been carried out on this data set, whichallows us to establish a consolidated error budget. The errors at mesoscaleare about 1.4 cm2 in low-variability areas, increase to an average of8.9 cm2 in coastal regions, and reach nearly 32.5 cm2 in highmesoscale activity areas. The DT2014 products, compared to the previousDT2010 version, retain signals for wavelengths lower than  ∼  250 km,inducing SLA variance and mean EKE increases of, respectively, +5.1 and+15 %. Comparisons with independent measurements highlight the improvedmesoscale representation within this new data set. The error reduction at themesoscale reaches nearly 10 % of the error observed with DT2010. DT2014also presents an improved coastal signal with a nearly 2 to 4 % meanerror reduction. High-latitude areas are also more accurately represented inDT2014, with an improved consistency between spatial coverage and sea iceedge position. An error budget is used to highlight the limitations of thenew gridded products, with notable errors in areas with strong internaltides

DUACS DT2014: the new multi-mission altimeter data set reprocessed over 20 years