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http://dx.doi.org/10.14191/Atmos.2017.27.2.235

Verification of the Global Numerical Weather Prediction Using SYNOP Surface Observation Data  

Lee, Eun-Hee (Korea Institute of Atmospheric Prediction Systems)
Choi, In-Jin (Korea Institute of Atmospheric Prediction Systems)
Kim, Ki-Byung (Korea Institute of Atmospheric Prediction Systems)
Kang, Jeon-Ho (Korea Institute of Atmospheric Prediction Systems)
Lee, Juwon (Korea Institute of Atmospheric Prediction Systems)
Lee, Eunjeong (Korea Institute of Atmospheric Prediction Systems)
Seol, Kyung-Hee (Korea Institute of Atmospheric Prediction Systems)
Publication Information
Atmosphere / v.27, no.2, 2017 , pp. 235-249 More about this Journal
Abstract
This paper describes methodology verifying near-surface predictability of numerical weather prediction models against the surface synoptic weather station network (SYNOP) observation. As verification variables, temperature, wind, humidity-related variables, total cloud cover, and surface pressure are included in this tool. Quality controlled SYNOP observation through the pre-processing for data assimilation is used. To consider the difference of topographic height between observation and model grid points, vertical inter/extrapolation is applied for temperature, humidity, and surface pressure verification. This verification algorithm is applied for verifying medium-range forecasts by a global forecasting model developed by Korea Institute of Atmospheric Prediction Systems to measure the near-surface predictability of the model and to evaluate the capability of the developed verification tool. It is found that the verification of near-surface prediction against SYNOP observation shows consistency with verification of upper atmosphere against global radiosonde observation, suggesting reliability of those data and demonstrating importance of verification against in-situ measurement as well. Although verifying modeled total cloud cover with observation might have limitation due to the different definition between the model and observation, it is also capable to diagnose the relative bias of model predictability such as a regional reliability and diurnal evolution of the bias.
Keywords
Near-surface predictability; numerical weather prediction; SYNOP surface observation; verification;
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