ECHAM6 모의자료를 경계자료로 한 RegCM4의남한지역 상세기후 모의 수준 = Simulation Skills of RegCM4 forced by ECHAM6 for Fine-scale Regional Climate over South Korea

다국어 초록 (Multilingual Abstract)

In this study, 25-year (1981~2005) fine-scale climate over North-East Asian region wasreproduced using RegCM4 with 12.5 km of horizontal resolution driven by ECHAM6 output (hereafter,RG4_EH6), and the model’s simulation skills were evaluated in terms of temperature, precipitation, andatmospheric filed. The model configuration is same as the study of Hong et al.(2013) except for lateralboundary condition (LBC), HadGEM2-AO (hereafter, RG4_HG2). Simulation skills of RG4_EH6were evaluated with observations and compared with the that of RG4_HG2. In general, the RegCM4well simulated the spatial and temporal variations of temperature and precipitation as compared withCRU observation, regardless of LBC. The RG4_EH6’s simulation skills for temperature and precipitationover South Korea are better than that of RG4_HG2, in particular summer precipitation and wintertemperature. And RG4_EH6 reproduced more precipitation during June and August than RG4_HG2.
The better simulation of wind and moisture fields during June and thermal environments during Augustby RG4_EH6 than RG4_HG2 resulted in the better simulation of summer precipitation over SouthKorea. However, RG4_EH6 also showed a dry bias during summer over South Korea as in the RG4_HG2. Also RG4_EH6 overestimated of weaker precipitation (< 10mm/day) but underestimated ofstronger precipitation (> 50mm/day) compared to observation. In addition to that, RG4_EH6 significantlyoverestimated the precipitation by about +1.36~1.84mm/day in spring and winter. The overestimation ofprecipitation was caused by the overestimation of south-westerly wind and moisture during winter.

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