Mr. Fu-ning Li Profile

Fu-ning Li

at Institute of Oceanology

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Proceedings Article | 8 November 2014 Paper

MTSAT-1R satellite-based overshooting top detection and relationship to precipitation intensity

Fu-ning Li, Fan Yu

Proceedings Volume 9259, 92590E (2014) https://doi.org/10.1117/12.2068678

KEYWORDS: Clouds, Satellites, Convection, Infrared radiation, Meteorology, Earth observing sensors, Satellite imaging, Meteorological satellites, Spatial resolution, Infrared detectors

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Both satellite-based 11-um infrared window channel brightness temperature (IRW BT) and 6-7-um water vapor minus IRW BT difference (WV-IRW BTD) have been widely used in detection of convective overshooting top (OT). In this paper, considering a significant negative correlation between WV-IRW BTD and IRW BT (<0.7 in 93.07% cases) but a banded distribution, a combined parameter named weighted BTD (WBTD) is constructed for convective OT detection, which offers an improvement over the WV-IRW BTD technique. With this method, MTSAT-1R satellite data and ground station precipitation data during July to September in 2010 in east China are used to research the relationship between OT occurrence and precipitation, also to study the variations of precipitation intensity (PI) and mean WBTD (WBTD_M) during the evolution of convective clouds. The results show that (1) 58.2% of the analyzed OT cases appear a certain rainfall and 46.32% of these precipitation events record over 1mm/10min PI; (2) in all recorded over 1mm/10min precipitation events, OT occurrence probability in the corresponding region is 12.55%, greater probability happens in higher PI, in over 10mm/10min cases, the probability rises to 34%; (3) study in ten groups of strong convective clouds shows a positive correlation (up to 0.9) between WBTD_OI and PI; OT occurrence probability in cloud area is great when convection develops to a strong phase, while very small even no OTs in the early and late of convection.

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