Steffen Tietsche

TL;DR: SEAS5 as discussed by the authors is the ECMWF's fifth generation seasonal forecast system, which became operational in November 2017 and includes upgraded versions of the atmosphere and ocean models at higher resolutions and adds a prognostic sea-ice model.

TL;DR: The ECMWF OCEAN5 system is a global ocean and sea-ice ensemble of reanalysis and real-time analysis as discussed by the authors, with the focus on upgrades of system components with respect to its predecessors, ORAS4 and ORAP5.

TL;DR: A review of the potential sources of Arctic sea-ice predictability on these time-scales is presented in this paper, where the inherent potential predictability limit with state-of-the-art models is estimated, together with their performance.

TL;DR: In this article, the authors examined the recovery of Arctic sea ice from prescribed ice-free summer conditions in simulations of 21st century climate in an atmosphere-ocean general circulation model and found that ice extent recovers typically within two years.

TL;DR: In this article, a set of ensemble potential predictability experiments with a global climate model, initialized with and without knowledge of the sea ice thickness initial state, have been run, and the results suggest that advancing capabilities to observe and assimilate seaice thickness into coupled seasonal forecast systems could significantly increase skill.