Accès ouvert
2026
article
OpenAlex
Jiwon Hwang, Dong‐Hyun Cha, Myong‐In Lee, Sang Seo Park et autres
Abstract Infrared (IR) radiances are highly sensitive to cloud top properties, making all‐sky data assimilation (DA) challenging due to scene‐dependent biases arising from uncertainties in cloud representation and radiative transfer modeling. This study introduces a phase‐aware nonlinear bias correction (BC) framework for …
kr
(code pays fourni par la source)
Accès ouvert
2026
article
OpenAlex
Young‐Chan Noh, Yonghan Choi, Joo-Hong Kim
Abstract The ocean plays a crucial role in the formation and melting of sea ice, which also affects the performance of sea ice data assimilation. To evaluate how ocean model complexity affects the assimilation performance, the sea ice model is separately coupled …
kr
(code pays fourni par la source)
Accès ouvert
2026
article
OpenAlex
Young‐Chan Noh, Yonghan Choi, Joo-Hong Kim
Supplementary Material 1
kr
(code pays fourni par la source)
Accès ouvert
2026
article
OpenAlex
Young‐Chan Noh, Yonghan Choi, Joo-Hong Kim
Supplementary Material 1
kr
(code pays fourni par la source)
Accès ouvert
2025
article
OpenAlex
Ji-Soo Kim, Young‐Chan Noh, Yonghan Choi, Joo-Hong Kim et autres
Abstract In data assimilation (DA), localization, which adjusts the influence of observations on model state vectors, is an essential process for improving initial conditions. Given that the localization radius varies depending on the model and observation, sensitivity tests were conducted to identify …
kr
(code pays fourni par la source)
2025
article
OpenAlex
Jiwon Hwang, Dong‐Hyun Cha, Minkyu Lee, Donghyuck Yoon et autres
Abstract This paper discusses the performance of the National Centers for Environmental Prediction (NCEP) Global Forecast System (GFS) forecast model in predicting rainfall over the Korean Peninsula caused by tropical cyclones (TCs). TCs forecasted in GFS were characterized by overestimated intensity and …
kr, us, jp
(code pays fourni par la source)
Accès ouvert
2025
conference-abstract
OpenAlex
Hataek Kwon, Yonghan Choi, Sang‐Jong Park
This study investigates the characteristics and mechanisms of strong winds at Jang Bogo Station (74°37'S, 164°12'E) in Terra Nova Bay, East Antarctica, using 8 years (2015-2022) of Automated Synoptic Observation System (ASOS) data and ERA5 reanalysis data. Analysis of strong wind patterns …
kr
(code pays fourni par la source)
2025
article
OpenAlex
Young‐Chan Noh, Eui‐Seok Chung, Yonghan Choi, Hyo‐Jong Song et autres
Localization is an essential technique to mitigate the sampling error in the ensemble Kalman filter (EnKF). To effectively utilize the localization function within the EnKF, the specific location information of observations being assimilated is required to measure the distance between the model …
kr, us
(code pays fourni par la source)
2024
preprint
OpenAlex
Young‐Chan Noh, Yonghan Choi, Mohamad El Gharamti, Joo‐Hong Kim et autres
To improve the sea ice initial condition in the Arctic, we assimilate the satellite-derived sea ice concentrations within the Data Assimilation Research Testbed (DART) system, based on the ensemble Kalman filter (EnKF), coupled with the sea ice model in the Community Earth …
kr, us, ru
(code pays fourni par la source)
2024
article
OpenAlex
Yonghan Choi, Joowan Kim, Joo‐Hong Kim, Dong‐Hyun Cha
Abstract In this study, the effects of assimilating Global Navigation Satellite System (GNSS) radio occultation (RO) observations from existing and recently added commercial cube satellites on analyses and forecasts over the Arctic region were investigated by conducting observing system experiments (OSEs). Profiles …
kr
(code pays fourni par la source)
Accès ouvert
2024
article
OpenAlex
Yonghan Choi, Joo‐Hong Kim, Sang‐Yoon Jun, Taejin Choi et autres
Abstract To compensate for the lack of conventional observations over the Arctic Ocean, ship-borne radiosonde observations have been regularly carried out during summer Arctic expeditions and the observed data have been broadcast via the global telecommunication system since 2017. With these data …
kr, us
(code pays fourni par la source)
Accès ouvert
2023
article
OpenAlex
Young‐Chan Noh, Yonghan Choi, Hyo‐Jong Song, Kevin Raeder et autres
To improve the initial condition (“analysis”) for numerical weather prediction, we attempt to assimilate observations from the Advanced Microwave Sounding Unit-A (AMSU-A) on board the low-Earth-orbiting satellites. The data assimilation system, used in this study, consists of the Data Assimilation Research Testbed …
kr, us
(code pays fourni par la source)