Yoo Chang-Hyun

Record-breaking rainfall occurred over East Asia during the summer of 2020. However, in which aspect the summer of 2020 can be differentiated from the other years remains to be quantified. To this end, this study employs Markov chain analysis to quantify summer rainfall variability over East Asia using three Markov descriptors for heavy precipitation events of over 10 mm day−1: frequency, persistence, and entropy (i.e., irregularity). It is found that the heavy rainfall during the summer of 2020

Due to frequent occurrence of abnormal weather, the need to improve the accuracy of subseasonal prediction has increased. Here we analyze the performance of weekly predictions out to 6 weeks by GloSea5 climate model. The performance in circulation field from January 1991 to December 2010 is first analyzed at each grid point using the 500-hPa geopotential height. The anomaly correlation coefficient and mean-square skill score, calculated each week against the ECWMF ERA-Interim reanalysis data, il

Concentrations of fine particulate matter smaller than 2.5 μm in diameter (PM2.5) over the Korean Peninsula experienceyear-to-year variations due to interannual variation in climate conditions. This study develops a multiple linear regressionmodel based on slowly varying boundary conditions to predict winter and spring PM2.5 concentrations at 1–3-month leadtimes. Nation-wide observations of Korea, which began in 2015, is extended back to 2005 using the local Seoul government’sobservations, const

This dataset provides gridded daily warm conveyor belt (WCB) frequency of occurrence for boreal winter (December–February) from 1 December 1980 to 28 February 2022 (3790 days). It includes WCB occurrence frequency on a 0.5° × 0.5° latitude–longitude grid in WCB_daily_1980_2022_DJF_latlon.nc, reported for the total field and separated into three vertical phases: inflow (GT800; pressure > 800 hPa), ascent (MIDTROP; 800–400 hPa), and outflow (LT400; pressure < 400 hPa). The file WCB_daily_1980_2022

This dataset provides gridded daily warm conveyor belt (WCB) frequency of occurrence for boreal winter (December–February) from 1 December 1980 to 28 February 2022 (3790 days). It includes WCB occurrence frequency on a 0.5° × 0.5° latitude–longitude grid in WCB_daily_1980_2022_DJF_latlon.nc, reported for the total field and separated into three vertical phases: inflow (GT800; pressure > 800 hPa), ascent (MIDTROP; 800–400 hPa), and outflow (LT400; pressure < 400 hPa). The file WCB_daily_1980_2022

The Global/Regional Integrated Model system (GRIMs) is upgraded to version 4.0, with the advancement of the moistureadvection scheme and physics package, focusing on the global model program (GMP) for seasonal simulation and climatestudies. Compared to the original version 3.1, which was frozen in 2013, the new version shows no Gibbs phenomenon in themoisture and tracer fields by implementing the semi-Lagrangian advection scheme with a better computational efficiency athigher resolution. The per

Hadley circulation (HC) is a planetary-scale overturning circulation in the tropics that transports momentum, heat, and moisture poleward. In this study, we evaluate the strength and extent of the HC in the historical and future climate simulations of the Korean Meteorological Administration (KMA) Advanced Community Earth system model (K-ACE), which was recently developed by the National Institute of Meteorological Sciences of Korea. Compared with a reanalysis product, the overall structure of t

Private companies are increasingly required to take more substantial actions on climate change. This study introduces the principle and cases of climate (physical) risk estimation for 11 private companies in Korea. Climate risk is defined as the product of three major determinants: hazard, exposure, and vulnerability. Hazard is the intensity or frequency of weather phenomena that can cause disasters. Vulnerability can be reflected in the function that explains the relationship between past weath