Journal of Environmental Science International (한국환경과학회지)

The Korean Environmental Sciences Society (한국환경과학회)
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Study on planetary boundary layer schemes suitable for simulation of sea surface wind in the southeastern coastal area, Korea

한반도 남동해안 해상풍 모의에 적합한 경계층 물리방안 연구

  • Kim Yoo-Keun (Department of Atmospheric Sciences, Pusan National University) ;
  • Jeong Ju-Hee (Department of Atmospheric Sciences, Pusan National University) ;
  • Bae Joo-Hyun (Department of Atmospheric Sciences, Pusan National University) ;
  • Song Sang-Keun (Department of Atmospheric Sciences, Pusan National University) ;
  • Seo Jang-Won (Marine Meteorology & Earthquake Research Laboratory, Meteorological Research Institute)
  • Published : 2005.11.01
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Abstract

The southeastern coastal area of the Korean peninsula has a complex terrain including an irregular coastline and moderately high mountains. This implies that mesoscale circulations such as mountain-valley breeze and land-sea breeze can play an important role in wind field and ocean forcing. In this study, to improve the accuracy of complex coastal rind field(surface wind and sea surface wind), we carried out the sensitivity experiments based on PBL schemes in PSU/NCAR Mesoscale Model (MM5), which is being used in the operational system at Korea Meteorological Administration. Four widely used PBL parameterization schemes in sensitivity experiments were chosen: Medium-Range Forecast (MRF), High-resolution Blackadar, Eta, and Gayno-Seaman scheme. Thereafter, case(2004. 8. 26 - 8. 27) of weak-gradient flows was simulated, and the time series and the vertical profiles of the simulated wind speed and wind direction were compared with those of hourly surface observations (AWS, BUOY) and QuikSCAT data. In the simulated results, the strength of rind speed of all schemes was overestimated in complex coastal regions, while that of about four different schemes was underestimated in islands and over the sea. Sea surface wind using the Eta scheme showed the highest wind speed over the sea and its distribution was similar to the observational data. Horizontal distribution of the simulated wind direction was very similar to that of real observational data in case of all schemes. Simulated and observed vertical distribution of wind field was also similar under boundary layer(about 1 km), however the simulated wind speed was underestimated in upper layer.

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References

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