2018年登陆热带气旋“温比亚”影响中国黄淮中部强降雨分析

doi:10.3969/j.issn.1673-503X.2020.06.002

Abstract

Abstract:

Based on optimal track data of tropical cyclone from China Meteorological Administration-Shanghai Typhoon Institute (CMA-STI), conventional observational data from Meteorological Information Combine Analysis and Process System (MICAPS), National Centers for Environmental Prediction (NCEP) 1°×1° reanalysis data, and temperature of black body (TBB) data retrieved from the FY-2G satellite, we analyzed the causes of rainstorms occurring in the central part of Huanghuai area from 02:00 on August 17 to 14:00 on August 19, 2018, influenced by a landing tropical cyclone (TC) "Rumbia".The results showed that short-time heavy precipitation occurs at most meteorological stations, which can be triggered by the front or rear borders of convective clouds, the train effect of convective cells, the central area of deep convective clouds, and the emergence of convective cells, as well as non-convective clouds.On August 17, rainstorms occur in the central and southern Huanghuai areas, at the right side of the pathway of "Rumbia".A middle-level inverted trough is located westward to a low-level inverted trough, which is favorable for the rainstorm formation in the central Huanghuai area.On August 18, several meso-scale systems are influencing the rainstorm, including the middle northern side of "Rumbia", a low-level inverted trough, the easterly jets, the TC circulation, and weak cold air.The enhanced precipitation in the central Huanghuai area is resulted primarily from the increase in convergence of water vapor at 925 hPa and divergence of water vapor at 400 hPa, and the increase of middle- and low-level equivalent potential temperature.The increase of vertical wind shear is a good indicator of strong precipitation.After 20:00 on August 18, upper-level southwesterly jets begin to form, and southerly winds along the east of low-level inverted trough enhance and move northward.With the coupling of upper- and low-level circulation, rainstorm in northern Shandong province develops, and rainstorm in the central Huanghuai area becomes weak obviously.

Key words: Landing tropical cyclone, Central Huanghuai area, Asymmetric precipitation, Rainstorm enhancement, Weak cold air, Vertical wind shear

CLC Number:

P458.1⁺24

Duan-yu ZHANG, Fei-yang WANG, Jin-tao YE. Characteristics of rainstorms in central Huanghuai area influenced by a landing tropical cyclone "Rumbia" in 2018[J]. Journal of Meteorology and Environment, 2020, 36(6): 10-20.

Figures/Tables 12

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时段	短时强降雨/站次	单站最大小时雨量/mm	最大6 h雨量/mm	47站平均6 h雨量/mm
17日02—08时	0	9.1	安徽灵璧11.2	0.7
17日09—14时	0	4.6	江苏睢宁6.7	0.8
17日15—20时	1	21.4	安徽五河49.6	3.2
17日21时至18日02时	1	28.1	安徽五河72.2	8.8
18日03—08时	19	48.1	安徽濉汐147.1	36.2
18日09—14时	31	93.9	河南商丘208.4	53.5
18日15—20时	27	66.8	安徽灵璧150.6	50.4
18日21时至19日02时	16	68.5	安徽灵璧170.2	34.4
19日03—08时	4	67.2	江苏丰县124.1	11.0
19日09—14时	1	26.2	河南杞县28.7	6.2

主要类型特征	站次数/站次	雨量区间/mm	雨量均值/mm
非对流云	13	20.4—53.6	30.6
对流云前边界	7	20.6—93.9	40.1
对流云后边界	27	20.3—67.2	31.0
对流云“列车效应”	20	20.6—91.6	32.9
对流云核心区	28	20.6—68.5	35.3
对流云合并	4	23.8—40.5	29.9
合计	99	20.3—93.9	33.1

时间	VWS₁/(m·s^-1)	VWS₂/(m·s^-1)	VWS₃/(m·s^-1)	A/℃	k/℃	SI/℃	PW/mm	12 h雨量/mm
17日08时	16.372	2.488	13.892	18.1	38.2	-1.26	67.7714	0.2
17日20时	22.605	9.935	13.563	16.7	37.0	-0.37	68.8107	12.1
18日08时	26.280	19.884	14.428	16.5	37.1	-0.69	69.8852	30.2
18日20时	27.251	12.244	18.185	14.4	37.8	-1.30	60.9704	52.0
19日08时	14.723	10.532	12.096	19.3	39.4	-1.79	70.2617	107.4

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Characteristics of rainstorms in central Huanghuai area influenced by a landing tropical cyclone "Rumbia" in 2018

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