지형자료 해상도에 따른 지역 기상 유동장 변화에 관한 연구

Abstract

Orographic effect is one of the important factors to induce Local circulations and to make atmospheric turbulence, so it is necessary to use the exact topographic data for prediction of local circulations. In order to clarify the sensitivity of the spatial resolution of topography data, numerical simulations using several topography data with different spatial resolution were carried out under stable and unstable synoptic conditions. the results are as follows: 1) Influence of topographic data resolution on local circulation tends to be stronger at simulation with find grid than that with coarse grid. there is little difference of temperature and wind pattern for simulation with 3 km grid interval but their difference in simulation with fine grid less than 3km is very clear. 2) The higher the topographic resolution is, the stronger the mountain effect is. When used topographic data resolution become fine, topography in numerical model become closer to real topography. For this reason topographic effect in numerical simulation is emphasized and surface sensible heat energy emitted from surface is increased. 3) The topographic effect tends to be stronger when atmospheric stability is strong stable. The accuracy of potential temperature estimation improve clearly under strong stable condition. 4) Although spatial resolution of topographic data is not fundamental factor for dramatic improvement of weather prediction accuracy, some influence on small scale circulation can be recognized, especially in fluid dynamic simulation. the topographic data resolution is one of important factors to simulate the flow precisely. In this study, we analyzed the simple two case with different atmospheric stability but various numerical simulation and analysis are needed for more detail understanding of the sensitivity of topographic resolution.