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SIMULATION OF BOUNDARY LAYER EFFECTS ON A HEAVY RAINFALL EVENT CAUSED BY A MESOSCALE CONVECTIVE SYSTEM OVER THE YELLOW RIVER MIDSTREAM AREA

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Journal of Tropical Meteorology 2020年第1期26卷 111-124页

作者：赵桂香王一颉王晓丽 Shanxi Meteorological Observatory Taiyuan 030006 China

A heavy rainfall event caused by a mesoscale convective system(MCS),which occurred over the Yellow River midstream area during 7-9 July 2016,was analyzed using observational,high-resolution satellite,NCEP/NCAR reanalysis,and numerical simulation *** heavy rainfall event was caused by one mesoscale convective complex(MCC)and five MCSs *** MCC rainstorm occurred when southwesterly winds strengthened into a *** MCS rainstorms occurred when low-level wind fields weakened,but their easterly components in the lower and boundary layers increased *** analysis revealed that there were obvious differences between the MCC and MCS rainstorms,including their three-dimensional airflow structure,disturbances in wind fields and vapor distributions,and characteristics of energy conversion and *** of the MCC was related to southerly conveyed water vapor and energy to the north,with obvious water vapor exchange between the free atmosphere and the boundary *** regeneration and development of the MCSs mainly relied on maintenance of an upward extension of a positive water vapor *** MCC rainstorm was triggered by large range of convergent ascending motion caused by a southerly jet,and easterly disturbance within the boundary *** a southerly fluctuation and easterly disturbance in the boundary layer were important triggers of the MCS *** and development of the MCC and MCSs were linked to secondary circulation,resulting from convergence of ekman non-equilibrium flow in the boundary *** intensity and motion of the convergence centers in MCC and MCS cases were ***,sub-synoptic scale systems in the middle troposphere played a leading role in determining precipitation distribution during this *** mesoscale systems triggered by the sub-synoptic scale system induced the heavy rainfall,small-scale disturbances within the boundary layer determined its inte

关键词： heavy rainfall MCS boundary layer disturbance ekman adaptation energy wave packet propagation numerical simulation

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