Y. Nie

TL;DR: The Subseasonal to Seasonal (S2S) Prediction research project has been established by the World Weather Research Programme/World Climate Research Programme as discussed by the authors, which is the main deliverable of this project is the establishment of an extensive database containing sub-seasonal (up to 60 days) forecasts, 3 weeks behind real time, and reforecasts from 11 operational centers, modeled in part on the The Observing System Research and Predictability Experiment (THORPEX) Interactive Grand Global Ensemble (TIGGE) database for medium-range forecasts.

TL;DR: In this paper , the magnitude of feedback between transient eddies and large-scale flow anomalies in multiple seasonal forecast systems is calculated and the authors show that current systems underestimate this positive eddy feedback, and that this deficiency is strongly linked to weak signal-to-noise ratios in ensemble mean predictions.

TL;DR: In this paper , the authors investigated the dynamical processes controlling the evolution of early-summer cut-off lows over Northeast Asia using the 6-hourly reanalysis data.

TL;DR: Wang et al. as discussed by the authors investigated the possible causes of extremely abnormal Northeast China cold vortex (NCCV) activities, and showed that the extreme NCCV activity is regulated by the preceding sea surface temperature (SST) anomalies in the tropical Pacific, the snow conditions over the Tibetan Plateau, and the wave-mean flow interaction over the Eurasian continent.

TL;DR: In this article , the phase asymmetry of integrated eddy feedback is majorly contributed by the eddy vorticity flux-induced dynamic feedback, whose related physical processes involving eddy transport and secondary meridional circulation are stronger under the negative NAO.