A5001014750- Climate variability and models
- Oceanographic and Atmospheric Processes
- Meteorological Phenomena and Simulations
- Atmospheric and Environmental Gas Dynamics
- Arctic and Antarctic ice dynamics
- Climate change and permafrost
- Atmospheric chemistry and aerosols
- Tropical and Extratropical Cyclones Research
- Cryospheric studies and observations
- Atmospheric Ozone and Climate
Seoul National University
2021-2024
Abstract. This study examines Quasi-Biennial Oscillation (QBO) teleconnections and their modulation by the El Niño-Southern (ENSO), using a multi-model ensemble of Atmospheric Processes And Role in Climate (APARC) QBO initiative (QBOi) models. Some difficulties arise examining observed QBO-ENSO from distinguishing ENSO influences outside region, due to aliasing between over historical record. To separate signals, simulations are conducted with annually-repeating prescribed sea-surface...
Abstract The El Niño–Southern Oscillation (ENSO) has a significant impact on the surface climate of East Asia by modulating atmospheric circulation over Kuroshio Extension. Here, we show that ENSO–East teleconnections are strongest in early winter due to combined effects Indian Ocean and Maritime Continent convections, but weakest mid‐winter as these tropical convections weaken. During Niño winter, convection is enhanced suppressed Continent. associated Rossby wave trains constructively...
Abstract This study explores the ensemble size effect on subseasonal-to-seasonal (S2S) forecasts of European Center for Medium-Range Weather Forecasts (ECMWF) model. The forecast skill and its sensitivity to are assessed troposphere stratosphere, compared with theoretical estimates under perfect model assumption. degree improvement in ensemble-mean increasing agrees well troposphere. However, does not yield as much expected. Decomposition mean square score reveals that weak stratosphere is...
Abstract The El Niño–Southern Oscillation (ENSO) significantly affects the wintertime surface climate in western North America (WNA) via Pacific/North American‐like teleconnection pattern. Here, we show that ENSO teleconnections over WNA have significant sub‐seasonal variation despite persistence of ENSO‐related tropical sea temperature anomalies throughout entire winter. ENSO–WNA become substantially weakened mid‐winter, considerably weaker than those early and late This mid‐winter...
Abstract The impact of the quasi‐biennial oscillation (QBO) on surface air temperature (SAT) in Northern Hemisphere extratropics is investigated. It found that QBO, defined as 70‐hPa zonal wind deep tropics, negatively correlated with SAT over western North Pacific February and March. Cold anomaly appears during QBO westerly phase. Such relationship likely mediated by subtropical jet. During phase, a horseshoe‐shaped forms upper troposphere lower stratosphere connected to equatorward shift...