Characteristics of Local Wind and Divergence Field During Daytime in Summer Over the Kanto Plain

This study clarifies the vertical structure of diurnal variations of local wind systems during daytime in summer over the Kanto Plain, by focusing on differences in wind systems caused by a pressure gradient under synoptic conditions. The degree of divergence, an index of the atmospheric vertical motion, was calculated using observed surface wind data in 2004-2008. Wind velocity was adjusted on the basis of the logarithmic law because of differences in the observation heights of winds at respective stations. Typical local wind appearance days were selected, and temporal changes in the characteristics of the average wind and divergence fields were examined. The patterns of local wind systems including sea breeze development and divergence fields were different depending on the direction of the geostrophic wind