甘肃北部短时强降水中尺度特征及物理量配置

doi:10.12118/j.issn.1000-6060.2022.067

Abstract

Abstract:

From the precipitation data of 27 national automatic weather stations and 635 regional weather stations in northern Gansu Province of China, combined with the conventional air, ground, and ECMWF reanalysis data, 104 cases of typical short-time heavy rainfall from May to September during 2016—2019 were selected. In this paper, mesoscale comprehensive analysis of environmental conditions for the occurrence and development of short-time heavy rainfall in northern Gansu Province was performed, and some characteristics and laws of short-time heavy rainfall in this region were revealed. The results show the following: (1) The short-time heavy rainfall in northern Gansu Province primarily occurs from June to August, and the intensity of short-time heavy rainfall is mostly 10-20 mm. (2) The typical characteristics of short-time heavy rainfall weather in northern Gansu Province can be divided into four flow types: subtropical high marginal type, low-pressure trough type, northwest airflow type, and high flow resistance type. (3) The relation and difference between different weather conditions, flow types, and physical parameters are discussed. The circulation characteristics and physical factors indexes and thresholds of various short-time heavy rainfall weather are summarized. (4) The surface convergence line (cold front) is the key system triggering severe convective weather in northern Gansu Province, and the analysis of the surface convergence line (cold front) is critical for short-time near rainfall forecast. (5) Low-level southerly jet (significant streamline) convergence at 110°E and 37°N is an important basis for judging whether short-time heavy rainfall can occur in northern Gansu Province. The prediction accuracy of short-time heavy rainfall in 2020 is 63.6%, indicating that the established short-time heavy rainfall forecast index has a strong capability, providing a new way to improve the short-time heavy rainfall forecast and early warning ability.

Key words: short-time heavy rainfall, weather types, mesoscale analysis, physical quantity, factors allocation

QIAN Li,ZHANG Chunyan,YANG Mei,LI Tianjiang. Mesoscale characteristics and physical quantity allocation of short-time heavy rainfall in northern Gansu Province[J].Arid Land Geography, 2022, 45(6): 1707-1717.

Figures/Tables 9

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References 19

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物理量阈值		副高边缘型	低压槽型	西北气流型	河套阻高型
抬升条件	500 hPa槽前	是	是	否	是
	中低层低涡切变	有	有	有	有
	地面辐合线	有	有	有	有
	低空辐合	有	有	有	有
	200 hPa急流	西风急流或分流区	西北风急流	西北风急流或分流区	西风急流
水汽条件	t₇₀₀-td₇₀₀/℃	≤4	≤4	≤7	≤4
	q₇₀₀/g·kg^-1	≥8	≥7	≥5	≥8
	qfdiv₇₀₀/g·hPa^-1·cm^-2·s^-1	≤-10	≤-2	≤-1	≤-1
	湿层/hPa	500~850	500~850	500~700	500~850
	低空偏南风急流（显著流线）	有	有	有	有
	θ_se700/℃	≥60	≥60	≥52	≥55
不稳定条件	温度垂直分布	上冷下暖	上冷下暖	上冷下暖	上冷下暖
	湿度垂直分布	深厚湿层	深厚湿层	上干下湿	深厚湿层
	t₇₀₀-t₅₀₀/℃	≥20	≥20	≥20	≥20
	CAPE/J·kg^-1	≥29	≥20	≥40	≥50
	K/℃	≥30	≥30	≥28	≥32
	VOR₇₀₀/10^-5·s^-1	≥2	≥5	≥2	≥12

物理量阈值		副高边缘型（2018-08-02）	低压槽型（2017-08-19）	西北气流型（2018-08-20）	河套阻高型（2019-06-20）
抬升条件	500 hPa槽前	是	是	否	是
	中低层低涡切变	切变线	切变线	低涡人字型切变	低涡人字型切变
	地面辐合线	有	冷锋	有	有
	低空辐合	偏北风与偏南风辐合	偏南风、偏东风与偏北风辐合	偏南风与偏北风辐合	西南风与东南风辐合
	200 hPa急流	分流区	西风急流入口区右侧	分流区	西风急流出口区左侧
水汽条件	t₇₀₀-td₇₀₀/℃	≤4	≤4	≤4	≤4
	q₇₀₀/g·kg^-1	8	10	8	8
	qfdiv₇₀₀/g·hPa^-1·cm^-2·s^-1	-20	-20	-10	-1
	湿层/hPa	500~850	500~850	700~850	500~850
	低空偏南风急流（显著流线）	有	有	有	有
	θ_se700/℃	76	72	68	64
不稳定条件	温度垂直分布	上冷下暖	上冷下暖	上冷下暖	上冷下暖
	湿度垂直分布	深厚湿层	深厚湿层	上干下湿	深厚湿层
	t₇₀₀-t₅₀₀/℃	≥20	≥20	≥20	≥20
	CAPE/J·kg^-1	132	224	440	50
	K/℃	36	32	36	32
	VOR₇₀₀/10^-5·s^-1	20	5	5	40

城市	副高边缘型		低压槽型		西北气流型		河套阻高型
城市	频次/次	频率/%	频次/次	频率/%	频次/次	频率/%	频次/次	频率/%
兰州市	24	42.1	12	25.5	9	34.6	11	26.2
白银市	19	33.3	15	31.9	10	38.5	8	19.0
武威市	8	14.0	10	21.3	3	11.5	9	21.4
张掖市	4	7.0	8	17.0	1	3.8	8	19.0
酒泉市	2	3.5	2	4.3	3	11.5	6	14.3

Mesoscale characteristics and physical quantity allocation of short-time heavy rainfall in northern Gansu Province

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