AbstractThis study examines whether environmental conditions can control convective rainfall rates and cloud-to-ground (CG) lightning frequencies in mesoscale convective systems (MCSs) over North China (NC). Sixty identified MCSs over NC during June-August of 2008-2013 were classified into four categories based on their high/low convective rainfall rates (HR/LR) and high/low lightning frequencies (HL/LL), i.e., HRHL, HRLL, LRHL and LRLL MCSs. MCSs with HR (HL) occurred most frequently in July (August), while those with LR or LL occurred most frequently in June; they followed closely seasonal changes. All MCSs were apt to form during afternoon hours. HRLL MCSs also formed during evening hours while HRHL MCSs could occur at any time of a day.A composite analysis of environmental conditions shows obvious differences and similarities among the HRHL, HRLL and LRLL categories, while the LRHL MCSs exhibited little differences from the climatological mean due to its small sample size. Both the HRHL and HRLL MCSs occurred in the presence of upper-level anomalous divergence, a midlevel trough, and the lower-tropospheric southwesterly transport of tropical moist air. In contrast, LRLL MCSs took place due to daytime heating over mountainous regions, with little midlevel forcing over NC. The HRHL, HRLL, LRHL and LRLL categories exhibited orders of the highest to smallest convective available potential energy and precipitable water but the smallest to largest convective inhibition and lifted indices. It is concluded that environmental conditions determine to some extent convective rainfall rates and CG lightning activity, although some other processes (e.g., cloud microphysics) also play certain roles, especially in CG lightning production.
Monthly Weather Review – American Meteorological Society
Published: Feb 14, 2018
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