Temporal and spatial characteristics of sea breeze over the west coast of Bohai Bay

Based on the hourly observational data from 14 automatic weather stations and the data from the 6-hourly general surface meteorological stations in Tianjin,the temporal and spatial characteristics of sea breeze over the Bohai west coast(Tianjin) in 2008 are analyzed.The result shows that sea breeze is prevalent from 14: 00 to 17:00 in spring and summer,and the highest frequency of sea breeze is in summer.In Dagang station,the annual frequency of sea breeze is about 31.0 %.The speed of sea breeze in standard stations is about 2 ~ 4 m/s,and the mainly wind direction is easterly and south-southeasterly.Over 50.0 percent of the sea breeze formed along the coast can spread into the inland about 30 km far away.The strength of sea breeze in coastal stations is greater than that in inland stations,and it’s stronger in suburban stations than that in urban ones.