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2019年夏季在海南文昌获取到1907号台风“韦帕”眼壁内的一次电场探空资料, 本文利用卫星、雷达、地面电场及海南省地闪定位资料对该台风特征进行详细分析, 在此基础上, 对探空路径区域内的电场廓线以及电荷区分布进行了分析, 结果显示: 在海拔高度5.74—9.10 km之间共有4个正电荷区和3个负电荷区, 这7个电荷区所处的温度区间在–2.4— –16.7 ℃之间, 自下而上各电荷区的平均电荷密度分别为0.63, –0.33, 0.31, –1.03, 1.70, 1.57和–1.20 nC/m3, 初步分析认为最上部的两个正电荷区应该为同一个电荷区, 由此在综合考虑电荷区厚度的情况下, 发现强度最大的三个电荷区分别为最下部的正电荷区、中部的主负电荷区与上部的主正电荷区, 三者呈三极性电荷结构特征, 其次为云上边界厚度较薄的负极性屏蔽电荷层, 下部正电荷区与主负电荷区之间的两个电荷区最弱.In the summer of 2019, one case of electric field sounding in eyewall of No.1907 typhoon named Wipha was obtained in Wenchang, Hainan Island, China. Up to now, it has been the first case of electric field sounding results obtained in a typhoon system. In this paper, based on the observations of satellite, meteorological radar, ground electric field and cloud-to-ground flash location data of Hainan province, China, the basic characteristics of the typhoon are analyzed in detail. Owing to the limitation of cloud-to-ground flash location system, only flash activities of the typhoon before and after landing period are analyzed and the result does not show obvious features as reported by other researches. Referring to the radar reflectivity and sounding path, we confirm that the sounding penetrates through the eyewall region of the typhoon from cloud base to top. The electric field profile and the charge region distribution in the sounding path area are analyzed, and the results show that four positive and three negative charge regions exist between 5.74 and 9.10 km above sea level and the corresponding temperatures range from –2.4 to –16.7 ℃ of the seven charge regions. The mean charge densities of each charge region from bottom to top are 0.63 nC/m3, –0.33 nC/m3, 0.31 nC/m3, –1.03 nC/m3, 1.70 nC/m3, 1.57 nC/m3 and –1.20 nC/m3, respectively. According to the preliminary analysis, we consider that the two positive charge layers at the top should be in the same charge region. Under the comprehensive consideration of the thickness of charge regions, the intensities of these six charge regions are 0.33 nC/m2, –0.07 nC/m2, 0.06 nC/m2, –0.87 nC/m2, 0.73 nC/m2, and –0.18 nC/m2, respectively. We can find that there are three dominant charge regions with largest intensity and they are the lowest positive charge region, the middle main negative region, and upper main positive charge region. And these vertical distributions of the three dominant charge regions are characterized by a tripole charge structure. These results are basically consistent with some simulation results. In addition, a negative screen charge region with a shallow depth in a range of 15–20 dBZ of the upper cloud boundary can be found. Combining the popular charging mechanisms, the similarity of tripole charge structure between our sounding and normal thunderstorm are discussed, and we preliminary consider that the non-inductive charging mechanism and the inductive charging mechanism, which originate from normal convection, are also suitable for eyewall region of typhoon.
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Keywords:
- typhoon /
- electric field profile /
- cloud-to-ground flash /
- tripole charge structure
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图 1 雷达、地闪定位网及电场探空观测站分布 ■: 探空点; Δ: 地闪定位子站;
: 雷达站和地闪定位子站Fig. 1. Radar site and lightning location substation. ■: Electric field sounding site; Δ: Substations of lightning location network;
: Radar site and lightning location substation.
图 2 台风路径及强度变化情况 (a)移动路径; (b)文昌登陆后(8月1日9:00)的葵花卫星红外云图; (c)台风中心气压强度的时间变化
Fig. 2. Typhoon path and intensity change: (a) Path; (b) Himawari satellite infrared cloud image (9:00, 1 August); (c) the evolution of air pressure at the center of typhoon Wipha.
图 3 2019年8月1日0:00 ~ 20:00时段1907号台风登陆海南与登陆湛江前后的地闪特征 (a)地闪活动的时间演变; (b)地闪活动的空间分布; (c)和(d)分别为04:27和14:32前后15 min内地闪与雷达回波的叠加, 黑色圆点代表地闪. 图中直线α, β, ζ和θ为图4对应的剖面位置
Fig. 3. The characteristics of cloud-to-ground flashes in typhoon No.1907 before and after landing in Hainan and Zhanjiang from 0:00 to 20:00 on August 1, 2019: (a) The evolution of cloud-to-ground flash activities; (b) spatial distribution of cloud-to-ground flash activities; (c) and (d) are the superposition of the flash locations upon radar echo for 30 minutes around 04:27 and 14:32, respectively, and the black dot represents the cloud-to-ground flashes. The line α, β, ζ and θ in this figure is the location of corresponding section in Fig. 4.
图 5 探空时段内的雷达回波的反射率以及垂直探空路径在回波剖面上的显示 (a) 10:09时的反射率(3 km高度处); (b)图(a)中黑色方框区域的放大, 显示探空路径与回波的地面投影以及剖面切割线(线段AB); (c)探空路径在回波剖面上的投影, 图中△代表气球释放点位置
Fig. 5. Sounding path and the corresponding Radar echo (10:09): (a) Radar echo at height of 3 km; (b) enlarged view of the section in the square of picture (a), the line AB is the location of vertical cross section and the black curve is the horizontal projection of the sounding path; (c) superposition image of radar echo vertical cross section of line AB in the (a) and sounding path. △: Sounding site.
图 6 2019年8月1日9:53:11—10:23:04台风眼壁区内的探空结果 (a)上升速度; (b)电晕电流; (c)电场(E)、温度(T); (d)电荷密度
Fig. 6. Sounding results in eyewall of No.1907 typhoon on August 1, 2019 (9:53:11–10:23:04): (a) Ascending velocity; (b) corona current; (c) E-field (E) and temperature (T); (d) charge density.
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[1] Jorgensen D P, Zipser E J, LeMone M A 1985 J. Atmos. Sci. 42 839
Google Scholar
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[4] Lyons W A, Venne M G, Black P G 1989 Preprints, 18th Conf. on Hurricanes and Tropical Meteorology, San Diego, CA, Amer. Meteor. Soc. 113
[5] Lay E H, Holzworth R H, Rodger C J, Thomas J N, Pinto O, Dowden R L 2004 Geophys. Res. Lett. 31 L03102
[6] Rodger C J, Brundell J B, Dowden R L 2005 Ann. Geophys. 23 277
Google Scholar
[7] Abarca S F, Corbosiero K L, Galarneau T J 2010 J. Geophys. Res. 115 D18206
Google Scholar
[8] Abarca S F, Corbosiero K L, Vollaro D 2011 Mon. Weather Rev. 139 175
Google Scholar
[9] Boccippio D J, Koshak W J, Blakeslee R J 2002 J. Atmos. Oceanic Technol. 19 1318
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[10] Koshak W J, Blakeslee R J, Bailey J C 2000 J. Atmos. Oceanic Technol. 17 279
Google Scholar
[11] Molinari J, Moore P, Idone V 1999 Mon. Weather Rev. 127 520
Google Scholar
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Google Scholar
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Google Scholar
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Zhang W J 2013 Ph. D. Dissertation (Beijing: University of Chinese Academy of Sciences) (in Chinese)
[15] DeMaria M, DeMaria R T, Knaff J A, Molenar D 2012 Mon. Weather Rev. 140 1828
Google Scholar
[16] Molinari J, Moore P K, Idone V P, Henderson R W, Saljoughy A B 1994 J. Geophys. Res. 99 16665
Google Scholar
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Google Scholar
[18] Lyons W A, Keen C S 1994 Mon. Weather Rev. 122 1897
Google Scholar
[19] Fierro A O, Leslie L, Mansell E, Straka J, MacGorman D, Ziegler C 2007 Meteorol. Atmos. Phys. 98 13
Google Scholar
[20] Price C, Asfur M, Yair Y 2009 Nat. Geosci. 2 329
Google Scholar
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Google Scholar
[22] Fierro A O, Shao X M, Hamlin T, Reisner J M, Harlin J 2011 Mon. Weather Rev. 139 1492
Google Scholar
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Google Scholar
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Google Scholar
Li W L, Liu D X, Qie X S, Fu S M, Duan S, Chen Y C 2012 Acta Phys. Sin. 61 059202
Google Scholar
[26] 刘冬霞 2010 博士学位论文 (北京: 中国科学院研究生院)
Liu D X 2010 Ph. D. Dissertation (Beijing: University of Chinese Academy of Science) (in Chinese)
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Google Scholar
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Google Scholar
[28] Saunders C P R, Peck S L 1998 J. Geophys. Res. 103 13949
Google Scholar
[29] Brooks I M, Saunders C P R, Mitzeva R P, Peck S L 1997 Atmos. Res. 43 277
Google Scholar
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Google Scholar
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Google Scholar
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Google Scholar
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Google Scholar
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Google Scholar
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Google Scholar
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Google Scholar
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Google Scholar
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Google Scholar
Xu L T, Zhang Y J, Wang F, Zheng D 2012 Chinese J. Atmos. Sci. 36 1041
Google Scholar
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Google Scholar
[56] Ziegler C L, MacGorman D R, Dye J E, Ray P S 1991 96 12833
[57] 徐良韬, 张义军, 张文娟, 王飞, 郑栋 2016 气象学报 74 1002
Xu L T, Zhang Y J, Zhang W J, Wang F, Zheng D 2016 Acta Meteorol. Sin. 74 1002
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