Jee-Hoon Jeong

TL;DR: It is found that decreased sea-ice cover during early winter months (November-December), especially over the Barents-Kara seas, enhances the upward propagation of planetary-scale waves with wavenumbers of 1 and 2, subsequently weakening the stratospheric polar vortex in mid-winter (January-February).

TL;DR: In this paper, the authors identify two distinct influences of Arctic warming which may lead to cold winters over East Asia or North America, based on observational analyses and extensive climate model results, and suggest that their results may help improve seasonal prediction of winter weather and extreme events in these regions.

TL;DR: The second phase of the Global Land-Atmosphere Coupling Experiment (GLACE-2) is aimed at quantifying, with a suite of long-range forecast systems, the degree to which realistic land surface initialization contributes to the skill of subseasonal precipitation and air temperature forecasts.

TL;DR: The second phase of the Global Land-Atmosphere Coupling Experiment (GLACE-2) is a multi-institutional numerical modeling experiment focused on quantifying, for boreal summer, the subseasonal forecast skill for precipitation and air temperature that can be derived from the realistic initialization of land surface states, notably soil moisture as mentioned in this paper.

TL;DR: In this article, the occurrence of cold surges in east Asia is significantly influenced by the Arctic Oscillation (AO), and the events of cold surge are objectively determined based on several synoptic criteria and the phase-dependency of its occurrences in association with the AO has been revealed.