A NUMERICAL STUDY ON VARIATION OF WATER VAPOR IN LOWER LAYERS CONNECTED WITH PRECIPITABLE WATER

Koji NISHIYAMA, Kenji JINNO, Akira KAWAMURA, Kenji WAKIMIZU
2002 PROCEEDINGS OF HYDRAULIC ENGINEERING  
It is quite difficult to predict a local severe thunderstorm formed under a pacific high pressure because of the shortage of observational systems. Recently, the technology of the estimation of precipitable water using GPS, expected for the local severe thunderstorms, has been developed. In this study, a numerical local circulation model was applied for a sea breeze circulation in order to make sure the relationship between precipitable water and water vapor in the lower layers, directly
more » ... rs, directly associated with atmospheric instability. These results show that an increase in precipitable water has directly responsibility to the accumulation of water vapor in the lower layers due to convergence along the sea breeze front. This makes the atmosphere above the sea breeze front more and more unstable and leads to the subsequent generation of thunderstorms. Therefore, the water vapor existed in the lower layers as well as precipitable water becomes quite significant clue for the generation of thunderstorms affected by an atmospheric local circulation in summer.
doi:10.2208/prohe.46.19 fatcat:hyu77osdqbf7tcgjx36j5bcb5m