http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
WRF 기반 지역기후모형을 이용한 1997년 여름 북서태평양 태풍의 모의 특징
진천실,차동현,이동규,Ying-Hwa Kuo 한국기상학회 2008 한국기상학회 학술대회 논문집 Vol.2008 No.-
본 연구에서는 WRF 기반 RCM을 이용하여 1997년 여름(JAS) 북서태평양 태풍모의의 특징과 환경요소의 영향을 살펴보았다. 통계적으로 RCM이 모의한 태풍은 재분석에 비하여 평균거리오차가 크지만 강도는 더 강하게 모의한다. 특히 RCM은 약한 태풍에 비하여 강한 태풍을 보다 현실적으로 모의하였는데 이것은 강한 태풍 주변의 환경요소가 태풍이 발달하기 좋은 조건을 갖기 때문이다. 또한 약한 태풍에 비하여 강한 태풍은 남동쪽으로 발생하여 오랜 시간 동안 해양으로부터 에너지를 공급받아 발달할 수 있다.
Analysis and Simulation of Mesoscale Convective Systems Accompanying Heavy Rainfall: The Goyang Case
최현영,하지현,이동규,Ying-Hwa Kuo 한국기상학회 2011 Asia-Pacific Journal of Atmospheric Sciences Vol.47 No.3
We investigated a torrential rainfall case with a daily rainfall amount of 379 mm and a maximum hourly rain rate of 77.5 mm that took place on 12 July 2006 at Goyang in the middlewestern part of the Korean Peninsula. The heavy rainfall was responsible for flash flooding and was highly localized. High-resolution Doppler radar data from 5 radar sites located over central Korea were analyzed. Numerical simulations using the Weather Research and Forecasting (WRF) model were also performed to complement the high-resolution observations and to further investigate the thermodynamic structure and development of the convective system. The grid nudging method using the Global Final (FNL) Analyses data was applied to the coarse model domain (30 km) in order to provide a more realistic and desirable initial and boundary conditions for the nested model domains (10 km, 3.3 km). The mesoscale convective system (MCS) which caused flash flooding was initiated by the strong low level jet (LLJ) at the frontal region of high equivalent potential temperature (θ_e) near the west coast over the Yellow Sea. The ascending of the warm and moist air was induced dynamically by the LLJ. The convective cells were triggered by small thermal perturbations and abruptly developed by the warm θ_e inflow. Within the MCS, several convective cells responsible for the rainfall peak at Goyang simultaneously developed with neighboring cells and interacted with each other. Moist absolutely unstable layers (MAULs)were seen at the lower troposphere with the very moist environment adding the instability for the development of the MCS.
김경나,Dae-Yong Eom,Dong-Kyou Lee,Ying-Hwa Kuo 한국기상학회 2010 Asia-Pacific Journal of Atmospheric Sciences Vol.46 No.3
A real-time forecast (RTF) system using Weather Research and Forecast (WRF) model version 2.2 is used to evaluate the diurnal variation of precipitation over South Korea in the summer (June to August) of 2007. The characteristics of the observed precipitation are also analyzed. The analysis and simulation period is divided into two sub-periods following the end of the changma, or East Asian monsoon, in 2007: Period_1 is from 1 June to 21 July, and Period_2 is from 22 July to 31 August. A 24-h precipitation cycle is observed over the entire period. The diurnal variation of precipitation over the South Korea shows that the nighttime maximum precipitation in Period_1 is affected by a largescale system; in contrast, the daytime maximum precipitation in Period_2 resulted from mesoscale convections is induced by thermal instability and moisture advection. The phases of the diurnal variation of simulated precipitation are consistent with those of the observed precipitation. The daytime rainfall amount of simulated precipitation in Period_2 is overestimated, and the convective rain process significantly affects the simulated total precipitation. The daytime overestimated precipitation is associated with overestimations of low-level temperature and moisture during the daytime in the model simulations as compared with the observations.
Chih-Hsin Li,Judith Berner,Jing-Shan Hong,Chin-Tzu Fong,Ying-Hwa Kuo 한국기상학회 2020 Asia-Pacific Journal of Atmospheric Sciences Vol.56 No.1
The Taiwan mesoscale ensemble prediction system (EPS) based on theWeather Research and Forecast model (WRF), also called WEPS, is designed to provide reliable ensemble forecasts for the East Asian region centered on Taiwan. The most skillful ensemble is obtained if model-uncertainty is represented in addition to initial condition uncertainty. A number of numerical prediction experiments are conducted to obtain the optimal configuration consisting of multiple physics-schemes, and two stochastic parameterization schemes: The Stochastic-Kinetic Energy Backscatter (SKEB) Scheme and the Stochastically Perturbed of Physics-Tendency (SPPT) scheme. The performance of the best configuration of WEPS is objectively verified against ECMWF reanalysis and a high-resolution simulation. Further analysis finds little impact of the stochastic schemes on quantitative precipitation forecasts and a single Typhoon case study. We conclude that for best performance over the East Asian domain, stochastic parameterizations alone are not sufficient to represent model-uncertainty and need to be augmented with a multi- physics suite.