TRAJECTORY DIAGNOSIS OF AIR PARCELS IN HIGH-AND LOW-LEVEL JETS FOR A HEAVY RAINFALL CASE DURING MEIYU SEASON OF 1991 |
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Authors: | Tao Zuyu and Huang Wei |
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Affiliation: | National Laboratory for Rainstorm Research, Chinese Academy of Meteorological Sciences, Beijing 100081;Department of Geophysics, Peking University, Beijing 100871 |
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Abstract: | Trajectory diagnostic methods were used to analyze air parcels of high-and low-level jets during the heavy rainfall of 4-6 July 1991.It is found that air parcels above rainfall area travelled from the entrance of the high-level jet,passing through the jet center and reached the exit region.Upper tropospheric divergence over rainfall area resulted from decelerative motion of the jet flow.Warm and moist southwest flow converged and ascended ahead of the low-level jet.The decreasing of low-level pressure as a result of high-level divergence that caused the low-level jet became unexpectedly strong. |
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Keywords: | heavy rainfall trajectory jet |
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