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Comparison of Characteristics and Environmental Factors of Thunderstorm Gales over the Sichuan-Tibet Region
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摘要: 利用2010—2017年中国气象局重要天气报、地面观测和探空资料以及欧洲中期天气预报中心ERA-Interim再分析资料，对川藏地区雷暴大风的活动特征、环境因子和环流形势进行统计分析，并对其中高原（海拔高度不低于1 km）和盆地（海拔高度低于1 km）区域雷暴大风活动进行对比。结果表明：川藏高原区域雷暴大风频次呈5—6月和9月双峰型分布，主要发生在午后；盆地区域主要发生在夏季，午后和夜间均较活跃。高原站雷暴大风年平均频次约为2次/站，在雷暴和大风中分别约占4.5%和8%。盆地站年平均频次仅为0.4次/站，雷暴中仅占1.5%，但在大风中约占60%。高原站雷暴大风的中低层环境温度递减率较大，一般呈上湿下干的逆湿垂直结构；而盆地站雷暴大风通常具有上干下湿的垂直结构。分别对5—6月和9月高原站雷暴大风两个峰值时段的环流形势进行合成分析，发现5—6月受高空西风槽影响，中层有弱冷平流侵入，高层位于高空急流入口区右侧，环境垂直风切变较大；而9月受副热带高压边缘影响，中高层较干，低层暖湿气流明显。这些均有利于雷暴大风发生。Abstract: Characteristics, environmental factors and synoptic situations of thunderstorm gales over the Sichuan-Tibet Region from 2010 to 2017 are analyzed based on significant weather report, surface observations and sounding data from China Meteorological Administration and ERA-Interim reanalysis data from European Centre for Medium-Range Weather Forecasts(ECMWF). Distinct properties are revealed through comparison of characteristics and environmental parameters of thunderstorm gales over highland(1 km above sea level) and basin(1 km below sea level). Results show that thunderstorm gales occur over the highland during a full year except winter, with two peaks in May-June and September, respectively. Their diurnal variation shows a major peak at 2000 BT. However, thunderstorm gales over the basin are active both in the afternoon and in the evening mainly in summer. The annual station-averaged frequency of thunderstorm gales over the highland is about 2 times per station, proportions of which to thunderstorms and gales are about 4.5% and 8%, respectively. It is only 0.4 times per station for thunderstorm gales over the basin, which account for 1.5% of the thunderstorms but 60% of gales. The atmospheric water vapor content, convective available potential energy and downdraft convective potential energy over the highland are significantly lower than those over the basin. The mean vertical temperature lapse rate in the middle and lower troposphere over the highland is larger than that over the basin. Usually, there is a shallow moist layer in the middle troposphere overlaid on a drier air layer over the highland. However, there is usually significant dry air in the middle troposphere and a moist layer at low level over the basin. Synoptic situations of thunderstorm gales over the Sichuan-Tibet Region are composited during two peaks in May-June and September, respectively. During May and June, the vertical wind shear of the environment is strong, with the middle level affected by a westerly trough transporting weak cold advection at 500 hPa, and the upper level located on the right side of a jet entrance at 200 hPa. However, in September, the middle level over the Sichuan-Tibet Region is at the north edge of subtropical high pressure at 500 hPa, with significant dry air in the mid-upper troposphere and remarkable warm moist air flow at low level. Though synoptic situations are different in two seasons, both of them can provide favorable condition to the formation of thunderstorm gales.
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图 2 2010—2017年雷暴、大风和雷暴大风站点平均频次及雷暴大风分别占雷暴和大风比例
(a)高原站频次逐年变化，(b)盆地站频次逐年变化，(c)高原站比例逐年变化，(d)盆地站比例逐年变化
Fig. 2 Station-averaged frequency of thunderstorms, gales and thunderstorm gales with proportion of thunderstorm gales to thunderstorms and gales during 2010-2017
(a)annual frequency over the highland, (b)annual frequency over the basin, (c)annual proportion over the highland, (d)annual proportion over the basin
图 3 2010—2017年站点平均的雷暴、大风和雷暴大风频次
(a)高原站逐月变化，(b)盆地站逐月变化，(c)高原站日变化，(d)盆地站日变化
Fig. 3 Station-averaged frequency of thunderstorms, gales and thunderstorm gales during 2010-2017
(a)monthly variation over the highland, (b)monthly variation over the basin, (c)diurnal variation over the highland, (d)diurnal variation over the basin
图 4 2010—2017年雷暴(a)，大风(b)，雷暴大风(c)年平均事件日数及雷暴大风占大风事件比例(d)
Fig. 4 Annual mean days of thunderstorms(a), gales(b), thunderstroms gales(c) and the proportion of thunderstorm gales to thunderstorms(d) during 2010-2017
图 5 2010—2017年雷暴大风强度空间分布
(a)平均风速，(b)最大风速，(c)风速为17~24 m·s-1的累计总频次，(d)风速大于等于25 m·s-1的累计总频次
Fig. 5 Spatial distributions of thunderstorm gale intensity during 2010-2017
(a)mean wind speed, (b)maximum wind speed, (c)total frequency with wind speeds between 17 and 24 m·s-1, (d)total frequency with wind speed no less than 25 m·s-1
图 6 2010—2017年川藏地区雷暴大风水汽参数(盒须图最高和最低线段分别为最大值和最小值，盒线段从上到下依次对应第75，50和25百分位值，对应数值在右侧标出，点为样本平均值)
(a)可降水量, (b)地面露点温度, (c)地面温度露点差, (d)中层最大温度露点差
Fig. 6 Water vapor parameters in the Sichuan-Tibet Region during 2010-2017 (the top and bottom whiskers are the maximum and minimum values, lines inside the boxes from top to bottom correspond to the 75th, 50th and 25th percentile, respectively, with values marked on the right, black dots denote mean values)
(a)precipitable water, (b)surface dew point temperature, (c)surface dew point depression, (d)midlevel maximum dew point depression
图 7 2010—2017年川藏地区雷暴大风热力参数(盒须图最高和最低线段分别为最大值和最小值，盒线段从上到下依次对应第75，50和25百分位值，对应数值在右侧标出，点为样本平均值)
(a)对流有效位能, (b)下沉对流有效位能, (c)对流抑制能量, (d)中低层垂直温度递减率
Fig. 7 Thermal parameters in the Sichuan-Tibet Region during 2010-2017 (the top and bottom whiskers are the maximum and minimum values, lines inside boxes from top to bottom correspond to the 75th, 50th and 25th percentile, respectively, with values marked on the right, black dots denote the mean values)
(a)convective available potential energy, (b)downdraft convective available potential energy, (c)convective inhibition, (d)vertical temperature lapse rate at low level
图 8 2010—2017年川藏高原站雷暴大风日平均合成高度场(等值线，单位：dagpm)和风场(风羽，单位：m·s-1)
(红色方框为研究区域，图 8a和图 8b中填色为温度平流，图 8c和图 8d中填色为相对湿度)
(a)5—6月500 hPa，(b)9月500 hPa，(c)5—6月600 hPa，(d)9月600 hPaFig. 8 Composited geopotential height(the contour, unit:dagpm) and wind(the barb, unit:m·s-1) of thunderstorm gale days over the Sichuan-Tibet highland during 2010-2017(the shaded denotes temperature advection in Fig. 8a and Fig. 8b, and relative humidity in Fig. 8c and Fig. 8d)
(a)500 hPa in May-Jun, (b)500 hPa in Sep, (c)600 hPa in May-Jun, (d)600 hPa in Sep
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