Diurnal variation of simulated 2007 summertime precipitation over South Korea in a real-time forecast model system

Kim, Kyungna; Eom, Dae-Yong; Lee, Dong‐Kyou; Kuo, Ying‐Hwa

doi:10.1007/s13143-010-0032-1

Cited by 4 publications

(1 citation statement)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The differences between simulated precipitation and TMPA observation indicate both the underestimation of heavy precipitation over three local maxima and the overestimation of light precipitation over land and ocean in the KF scheme (Figure g). This confirms the results of Kim et al [], suggesting that the KF scheme tends to produce more precipitation to reduce instability under relatively unstable atmospheric conditions with excessive low‐level moisture. The SAS scheme largely underestimates the precipitation over the region where a major monsoon band is located (Figure h), which is consistent with Lim et al [] pointing out a much weaker monsoon circulation compared to the observation.…”

Section: Evaluation Of Model Performance Over East Asiasupporting

confidence: 91%

Sensitivity of diurnal variation in simulated precipitation during East Asian summer monsoon to cumulus parameterization schemes

et al. 2015

View full text Add to dashboard Cite

The capability to simulate the diurnal variation of precipitation over East Asia region during the summertime of 2011 is investigated using five different cumulus parameterization schemes with the Weather Research and Forecasting model. A semidiurnal cycle with a 12 h interval over land and a diurnal cycle with a 24 h interval over ocean are commonly found in all simulations, consistent with the observed diurnal cycle. Two observed dominant peaks in the early morning and afternoon are reproduced in all simulations. With overestimated precipitation rate, however, the simulated afternoon peaks occur earlier than the observed peaks by 2 h for the Kain‐Fritsch (KF) and Simplified Arakawa‐Schubert schemes, and by 3 h for the Betts‐Miller‐Janjić and Tiedtke schemes. The overestimation of simulated precipitation frequency leads to amplitude and phase errors in the precipitation rate, and the early peak time of simulated precipitation intensity intensifies the phase error in the simulation over land. The KF scheme with alternative trigger function (KFtr) based on moisture advection provides slightly better results in terms of alleviating the overestimated precipitation rate and frequency and delaying the afternoon peaks. Additional sensitivity simulations based on the change of temperature perturbation in the trigger function of the KF and KFtr schemes demonstrate the afternoon peak tends to be delayed as temperature perturbation decreases, implying the significant role of convective initiation frequency in determining diurnal peaks of precipitation. Modulation of temperature perturbation alleviates the precipitation frequency bias, while it could not resolve the precipitation intensity bias.

show abstract

Section: Evaluation Of Model Performance Over East Asiasupporting

confidence: 91%