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CN 11-1768/O4

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基于火箭探空资料的冰雹云内部结构个例分析
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陕西省人工影响天气办公室

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Case Study of Hail Cloud Internal Structure Based on Rocket Sounding Date Jinhui, TIAN Xian and YUE Zhiguo
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    摘要:

    摘 要:利用探空火箭,新一代天气雷达和气象探测资料对2015年7月17日延安宝塔区冰雹云进行了综合探测,结果表明:(1)当日08时500hPa河套低涡分裂东移,有较强冷平流且移动速度较快,地面14时升温明显造成了这次降雹。(2)偏后位置的冰雹云内部温、湿条件,对流指数(Tg)、整层比湿积分(IQ)、总指数(TT)均小于外部的自然大气;层结稳定度指数(K)、抬升指数(LI)、沙氏指数(SI)冰雹云内部比外部自然大气偏小;热力参数风暴强度指数(SSI)冰雹云内部低于外部自然大气;冰雹云内部能量参数(Cape)、对流加速度(Vm)明显低于自然大气;冰雹云内部0℃层高度低于冰雹云外部自然大气。(3)火箭探测的位置偏冰雹云后部,冰雹云由低层到高层风向呈逆时针变化,探空仪摆动明显,-20℃温度层偏高,气流较强,整层偏下沉气流。(4)冰雹云0℃附近温度区间5.0℃--1.8℃,厚度1.0km范围内有最大湿度区,湿度达80%以上,最大湿度87.1%,为冰雹的形成提供了水汽条件。(5)紧贴0℃下部,有最大水平风速为19m·s-1急流,厚度为0.022km。在温度区间5.0--4.8℃,厚度为1.6km范围内维持13m·s-1以上水平风速,为冰雹的形成提供了动力场条件。(6)温度区间-8.7--9.2℃,厚度0.2km,有≤2m·s-1弱风区,弱风区下方-4.6--8.8℃,厚度0.889km有上升气流,平均上升速度1.79 m·s-1,对最大上升速度4m·s-1,这种配置为冰雹的生长提供了环境场。

    Abstract:

    Using sounding rocket data, a new generation of weather radar data and meteorological data to comprehensively analyze the hail cloud in Baota District, Yan"an County on July 17, 2015. The results show: (1)At BT 08:00 am, low vortex in Hetao Region split eastward, with a strong cold advection, moving fast and a rising of surface temperature at BT 14:00 pm caused this hail. (2) The hailstorm conditions inside the backward position, such as temperature and humidity ,Tg convection index, IQ whole layer special humidity integral, TT(Totals totals index)are smaller than that in external natural atmosphere. The stratification stability, expressed by K index, LI(lifted index )and SI(Showalter index )show that hail clouds are smaller inside than outside. The thermal parameter SSI(Storms Severity Index) in the hail cloud is lower than that in natural atmosphere. The internal energy parameter CAPE(Convective Available Potential Energy)and Vm(maximum updraft velocity) in the hail cloud are significantly lower than that in natural atmosphere. The 0℃ layer height in the hail cloud is not so high as that in natural atmosphere. The - 20 ℃ high temperature layer, air flow is stronger, the whole layer partial sinking airflow. (3) Location of the rocket detection is opposite to the back of the hail cloud. The wind direction changes counterclockwise from the down to the up in hail cloud. (4)The temperature range which is near the 0℃ layer in hail cloud is 5.0℃--1.8℃. The maximum humidity area is within the depth of 1.0km, where humidity is over 80% and the maximum humidity is 87.1%. These provide water vapor conditions for the formation of hail. (5)There is a maximum horizontal wind speed of 19 m·s-1 rapid flow and thickness of 0.022 km close to the lower layer of 0℃.It is also maintain a horizontal wind speed of 13 m·s-1 or above in the temperature range of 5.0--4.8℃ and a thickness within 1.6km. These provide a dynamic field condition for the formation of hail.(6)There is a weak wind zone of ≤2 m·s-1 in areas where temperature range is -8.7--9.2℃ and the thickness is in 0.2km. Below the weak wind zone, where temperature range is -4.6--8.8℃ and the thickness is in 0.889km, it is updraft. In this place, the average rising speed is 1.79 m·s-1 and the maximum rising speed of 4 m·s-1. This configuration provides an environmental field for the growth of hail.

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  • 收稿日期:2019-01-30
  • 最后修改日期:2019-06-25
  • 录用日期:2019-07-02
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