Abstract:With the rapid development of coastal cities,the urban climate and environment have gradually become deteriorated.Therefore,it is urgent and important to assess the effects of sea-land breeze,which appears under weak atmospheric circulation,on improving the urban environment.In this paper,Jinjiang was taken as an example,which is a highly developed coastal city in Fujian Province,China.Based on the wind observations from distributed meteorological stations in Jinjiang,the characteristics of sea-land breeze in two different typical days were analyzed.Then,the weather research and forecasting (WRF) model,coupled with a land surface model (Noah) and an urban canopy model (BEP),was applied to simulate the wind fields over two days.Next,the local wind was decomposed from the simulation results and used to identify sea-land breezes in the Jinjiang area.Validation of sea-land breezes from the WRF simulations was conducted,and their spatial distribution were analyzed.The results showed that the simulated temporal series of hourly local wind directions were highly consistent with the observations without a significant difference at the 0.05 level,while the simulated local wind speed shows significant deviation from the observed data,with an average difference of about 1 m/s.At the same time,there were also some difference between the simulated and observed data in terms of the retrieved starting time,end time and duration for both sea and land breezes.The spatial distributions of the sea and land breezes over the two days were consistent with those of the starting time,and it was not apparent that the emergence of sea-land breezes could be suppressed merely due to distance from the shore.The above-mentioned results indicated that the WRF model is able to simulate sea-land breeze,and extract its characteristics accurately,although there remain some uncertainties in the simulated wind speed.The results also provide a reference to the planning of Jinjiang City,and suggestions to the improvement of its urban micro-environment.