Analysis of Mesoscale Feature of a Heavy Rainstorm Caused by Typhoon Residual Vortex in the Northern Part of Northeast China

REN Li; ZHAO Ling; MA Guozhong; LIN Jia'nan

doi:10.7522/j.issn.1000-0534.2018.00036

2018 , Vol. 37 >Issue 6: 1671 - 1683

DOI: https://doi.org/10.7522/j.issn.1000-0534.2018.00036

Analysis of Mesoscale Feature of a Heavy Rainstorm Caused by Typhoon Residual Vortex in the Northern Part of Northeast China

REN Li ,
ZHAO Ling ,
MA Guozhong ,
LIN Jia'nan

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Meteorological Observatory of Heilongjiang Province, Harbin 150030, Heilongjiang, China;Meteorological Office of Binxian, Binxian 150400, Heilongjiang, China

Received date: 2017-11-22

Online published: 2018-12-28

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Abstract

Based on the conventional observational data, satellite cloud images, radar echo data, automatic weather stations rainfall and NCEP/NCAR reanalysis data (0.25°×0.25°), the mesoscale features of a heavy rainstorm by the residual circulation of Typhoon Haitang in the northern part of Northeast China from 3 to 4 August 2017 were analyzed. The major conclusions were as follow:The residual circulation of typhoon had been strengthened again after it was moved into Northeast China. The negative pressure center on the ground was located at the inverted trough shear on the north side of the cyclone. The rapid development of cyclone and the enhancement of the convergence of the variable pressure wind resulted in the lower level convergence and heavy rains. The zonal distribution in the rainstorm area showed a tendency to increase northward, and there were obvious mesoscale features in the space-time distribution. Precipitation had the characteristics of strong intensity, sudden strength and short duration. The rainstorm zone was linear, with a horizontal width of 50 km and a length of 300 km, which had typical characteristics of the mesoscale-β. The sounding analysis showed that the atmosphere was in an unstable state, which was advantageous to the convection development with short time heavy rainfall. Heavy rains were caused by the mesoscale convection systems (MCS) activities. Each time the heavy precipitation was corresponding to the black body temperature (TBB) low value center, and the delay was about 1 h. In the process of convective cloud spreading from south to north, heavy rain occurred mainly in the area of cold cloud area or the TBB gradient at the posterior edge of the cloud cluster. The backward propagation of radar echo caused the strong echo activity in the rainstorm zone, and the precipitation lasted for a long time. Heavy precipitation was a warm cloud precipitation which led to high precipitation efficiency and strong rainfall. The mesoscale convective system which caused torrential rain, had a deep vertical motion. The deep vertical motion strengthened the lower layer heat and water vapor transmission. The positive vortex column of middle and lower level was enhanced rapidly, and the water vapor convergence was enhanced, which strengthened the development and duration of mesoscale convective systems. The middle and upper layer had dry air activity, which not only triggered convection, but also greatly reduced the atmospheric stability and provided favorable conditions for the occurrence and development of convection.

Key words： Inverted trough shea; cold air; rainstorm; mesoscale convection

Cite this article

REN Li , ZHAO Ling , MA Guozhong , LIN Jia'nan . Analysis of Mesoscale Feature of a Heavy Rainstorm Caused by Typhoon Residual Vortex in the Northern Part of Northeast China[J]. Plateau Meteorology, 2018 , 37(6) : 1671 -1683 . DOI: 10.7522/j.issn.1000-0534.2018.00036

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