关键词: 山东中部, 地闪, GPS, 地形

Abstract:

Based on conventional observation data, NCEP reanalysis data , lightning location data , Doppler radar data, FY-2E satellite images and Global Positioning System(GPS) precipitable water, the severe convective weather process in central part of Shandong Province on July 4, 2013 was analyzed. The results show that the eastward movement of short wave trough, development of mesoscale cyclone system and invasion of the dry and cold air masses from the back of northeast trough resulted in this strong convection weather. Strong convection appeared in low-level convergence and high-level divergence region, which corresponded to the strongest updraft area. The intensive region of negative cloud-to-ground lighting correspond to higher convection available potential energy(CAPE) and pseudo-equivalent potential temperature values. Lightning  mainly distributed in area with equivalent blackbody temperature(TBB) less than 60 ℃. The lower TBB was, the more intensive cloud to ground lighting became. During development of the strong convection, the negative cloud-to-ground lighting was predominant in the whole strong convective process. Negative cloud-to-ground lighting mainly located at the strong echo area with intensity > 48 dBZ and echo top height ≥10 km. Radar vertically integrated liquid(VIL) and GPS could reflect the precipitation time and precipitation properties. The radar VIL peak value fitted well with the time of precipitation. Special terrain had a great contribution to the precipitation.

Key words: the central of Shandong Province, cloud to ground lighting, Global Positioning System (GPS), terrain