Analysis of the Phenomenon of Lake-Land Breeze in Poyang Lake Area

Abstract

Using the 2006-2010 conventional observed wind data from De' an,Poyang,Hukou,Jinxian and Xingzi,the lake-land breeze in Poyang Lake area was analyzed. These five observation stations are located within about 50 km radius of the Poyang Lake,which are respectively in the west,east,north,south and northwest parts of the Lake. The results show that lake-land breeze in Poyang Lake region occurs through the whole year,although it varies seasonally. Averagely,the strength of the zonal lake-land breeze is larger than the strength of the meridional lake-land breeze,with the values of 0. 5 ~ 0. 7 m ·s-1and 0. 3 m ·s-1respectively.The transition of lake-land breeze in the west of Lake is about two hours earlier than that in the east of Poyang Lake,and the transition of lake-land breeze in the north of Poyang Lake is about five hours earlier than that in the south of Poyang Lake. Analyses of the wind and temperature data in August 2010 from the 153 automatic meteorological stations in the Poyang Lake region show that the lake-land breeze presents diurnal variation obviously due to the lake-land temperature difference. The shallow wave model is employed to study the cause of the lake-land breeze in Poyang Lake region by setting the heating term as the Poyang Lake,and the model can simulate the land breeze during the night and lake breeze during daytime.