Characteristics of Convection-triggering Drylines in the Drainage Area of Huanghe and Huaihe Rivers

Wang Jinlan; Yu Xiaoding; Tang Xingzhi; Yu Haijing; Hu Liangfan

doi:10.11898/1001-7313.20210507

Vol.32, NO.5, 2021

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Wang Jinlan, Yu Xiaoding, Tang Xingzhi, et al. Characteristics of convection-triggering drylines in the drainage area of Huanghe and Huaihe Rivers. J Appl Meteor Sci, 2021, 32(5): 592-602. DOI: 10.11898/1001-7313.20210507.

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Wang Jinlan, Yu Xiaoding, Tang Xingzhi, et al. Characteristics of convection-triggering drylines in the drainage area of Huanghe and Huaihe Rivers. J Appl Meteor Sci, 2021, 32(5): 592-602. DOI: 10.11898/1001-7313.20210507.

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Characteristics of Convection-triggering Drylines in the Drainage Area of Huanghe and Huaihe Rivers

DOI: 10.11898/1001-7313.20210507

Wang Jinlan^{1, 2},
Yu Xiaoding^{3
,
,},
Tang Xingzhi⁴,
Yu Haijing^{1, 2},
Hu Liangfan^{1, 2}

1.
CMA·Henan Key Laboratory of Agrometeorological Support and Applied Technique, Zhengzhou 450003
2.
Xinxiang Meteorological Bureau of Henan, Xinxiang 453003
3.
China Meteorological Administration Training Center, Beijing 100081
4.
Hubei Branch of China Meteorological Administration Training Center, Wuhan 430074

Received Date: 2021-05-14
Rev Recd Date: 2021-08-03
Publish Date: 2021-09-30

Abstract

Abstract

Based on the surface and sounding datasets, ERA5 reanalysis data from European Centre for Medium-Range Weather Forecasts (ECMWF) and the satellite images, the characteristics of convection-triggering drylines in the drainage area of Huanghe and Huaihe Rivers of China from April to September during 2010-2019 are analyzed. The result shows that the drylines mainly appear at Dezhou of Shandong, and surroundings in the north of Henan. Most of them are distributed in the quasi northwest-southeast and northeast-southwest direction, with the length of 100-200 km and the width of 50-100 km, and they generally occur at 1400 BT or 1700 BT during the daytime. The drylines mostly occur under the 500 hPa cold vortex located in Northeast China and North China, with convergence lines (or shear lines) on 700 hPa and 850 hPa weather chart, and within the low pressure behind the coastal high on the surface chart. The statistics of the surface elements shows that the temperature on the dry side is 1.9 ℃ higher than that on the wet side, while the dew point temperature on the wet side is 6.8 ℃ higher than that on dry side. The gradient of temperature, dew point temperature and specific humidity on both sides of drylines are -2.7 ℃·(100 km)^-1, 10.1 ℃·(100 km)^-1 and 5.9 g·kg^-1·(100 km)^-1, respectively. According to the statistics of sounding environment parameters, precipitable water in the wet side is higher than that on the dry side. The specific humidity on the wet side is higher than that on the dry side at 925 hPa, 850 hPa and 700 hPa. The mean convective available potential energy on the wet side is much larger than that on the dry side. The temperature differences are very small on both sides of the drylines at 850 hPa and 500 hPa, 700 hPa and 500 hPa. The significant difference on both sides of the dry side in convective available potential energy is mainly caused by the difference in water condition of the lower layers in the drainage area of Huanghe and Huaihe Rivers of China. The hydrostatic instability (conditional instability) on both sides of the drylines is similar. Also, the vertical wind shear of 0-6 km is a little bit stronger on wet side than that on the dry side.
- the drainage area of Huanghe and Huaihe Rivers;
- convection-triggering;
- dryline;
- statistical analysis

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References(34)

Figures and Tables

Fig. 1 Surface meteorological elements on both sides of convection-triggering dryline in the drainage area of Huanghe and Huaihe Rivers from 2010 to 2019

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Fig. 2 Precipitable water on both sides of convection-triggering dryline in the drainage area of Huanghe and Huaihe Rivers from 2010 to 2019

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Fig. 3 Specific humidity on both sides of convection-triggering drylines in the drainage area of Huanghe and Huaihe Rivers from 2010 to 2019

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Fig. 4 Convective available potential energy, temperature differences of 700 hPa to 500 hPa and 850 hPa to 500 hPa on both sides of convection-triggering drylines in the drainage area of Huanghe and Huaihe Rivers from 2010 to 2019

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Fig. 5 The vertical wind shear of 0-6 km on both sides of convection-triggering drylines in the drainage area of Huanghe and Huaihe Rivers from 2010 to 2019

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Fig. 6 The surface chart of dryline in the drainage area of Huanghe and Huaihe Rivers at 1400 BT 11 Jun 2011

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图 7 2011年6月11日黄淮地区触发对流天气的干线系统配置图

(箭头表示气流方向)

Fig. 7 The system configuration of convection-triggering dryline in the drainage area of Huanghe and Huaihe Rivers on 11 Jun 2011

(the arrow denotes the direction)

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Table 1 Convection-triggering drylines in the drainage area of Huanghe and Huaihe Rivers from 2010 to 2019

序号	发生时间	发生地点	伴随天气	环流背景
1	2010-06-03T14:00，17:00	德州—淄博	雷阵雨	华北冷涡后部
2	2010-06-17T14:00	濮阳南乐	雷阵雨	华北冷涡底部
3	2010-07-07T14:00	原阳	雷阵雨	副热带高压外围偏西气流
4	2011-06-08T14:00，17:00	商丘永城	雷阵雨	槽后西北气流
5	2011-06-11T14:00，17:00	濮阳—商丘	雷阵雨、大风冰雹	华北冷涡底部
6	2012-05-16T14:00	临沂—徐州	雷阵雨、大风	东北冷涡底部
7	2012-05-25T14:00	保定东—泊头	雷阵雨、大风	东北冷涡后部
8	2012-06-06T14:00，17:00	河北吴桥	雷阵雨	槽前
9	2013-05-23T14:00	民权—扶沟	雷阵雨	槽前
10	2014-06-10T14:00	保定—淄博	阵雨、大风	东北冷涡底部
11	2015-08-22T14:00	安阳附近	阵雨、大风	东北冷涡底部
12	2015-08-28T14:00	德州—泰山	阵雨、大风、冰雹	东北冷涡底部
13	2017-04-20T14:00	河北山东交界	阵雨	东北冷涡后部
14	2017-06-12T14:00	吴桥—济南	阵雨	脊前西北气流
15	2018-06-13T14:00	新乡	阵雨、大风、冰雹	华北冷涡底部
16	2019-05-10T14:00	邢台—安阳	阵雨、大风	偏西气流

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Table 2 Soundings on both sides of convection-triggering drylines in the drainage area of Huanghe and Huaihe Rivers from 2010 to 2019

条件	要素	位置	平均值	25%百分位	75%百分位	最大值
水汽条件	可降水量/cm	湿侧	2.5	2.0	3.2	4.0
	可降水量/cm	干侧	2.3	1.6	2.8	3.8
	700 hPa比湿/(g·kg^-1)	湿侧	3.2	1.0	5.0	7.0
	700 hPa比湿/(g·kg^-1)	干侧	2.4	0.8	4.0	6.0
	850 hPa比湿/(g·kg^-1)	湿侧	5.6	3.8	8.0	11.0
	850 hPa比湿/(g·kg^-1)	干侧	5.9	3.8	8.0	12.0
	925 hPa比湿/(g·kg^-1)	湿侧	9.4	7.3	11.0	19.0
	925 hPa比湿/(g·kg^-1)	干侧	7.4	4.8	11.0	21.0
热力不稳定	对流有效位能/(J·kg^-1)	湿侧	2214	1725	3184	4348
	对流有效位能/(J·kg^-1)	干侧	614	236	800	1910
	700 hPa与500 hPa温度差/℃	湿侧	18.3	17.0	19.3	22.0
	700 hPa与500 hPa温度差/℃	干侧	18.2	17.0	20.0	20.0
	850 hPa与500 hPa温度差/℃	湿侧	29.9	29.0	31.0	35.0
	850 hPa与500 hPa温度差/℃	干侧	29.6	27.8	32.0	33.0
	抬升指数/℃	湿侧	-6.9	-7.9	-6.3	-1.5
	抬升指数/℃	干侧	-2.2	-3.1	-0.6	0.5
风切变	风矢量差/(m·s^-1)	湿侧	12.5	7.5	17.5	24.5
风切变	风矢量差/(m·s^-1)	干侧	11.2	6.3	15.7	24.4

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Table 3 Statistics of specific humidity and convective available potential energy on both sides of convection-triggering drylines in the drainage area of Huanghe and Huaihe Rivers using ERA5 reanalysis from 2010 to 2019

条件	要素	相对位置	平均值	25%百分位	75%百分位	最大值
水汽条件	700 hPa比湿/(g·kg^-1)	湿侧	4.5	3.6	5.6	6.5
	700 hPa比湿/(g·kg^-1)	干侧	4.2	3.4	5.0	6.5
	850 hPa比湿/(g·kg^-1)	湿侧	9.4	8.1	11.8	13.0
	850 hPa比湿/(g·kg^-1)	干侧	8.1	6.8	9.6	12.5
	925 hPa比湿/(g·kg^-1)	湿侧	10.2	9.3	12.6	14.0
	925 hPa比湿/(g·kg^-1)	干侧	8.7	7.8	10.3	12.0
热力不稳定条件	对流有效位能/(J·kg^-1)	湿侧	1000	288	1550	2500
	对流有效位能/(J·kg^-1)	干侧	331	100	325	1400
	700 hPa与500 hPa温度差/℃	湿侧	17.8	16.6	18.9	21.6
	700 hPa与500 hPa温度差/℃	干侧	17.8	16.8	18.8	21.5
	850 hPa与500 hPa温度差/℃	湿侧	29.2	27.9	30.4	34.5
	850 hPa与500 hPa温度差/℃	干侧	29.2	27.9	30.5	34.2

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