The Physical Properties and Seeding Potential Analysis of a Low Trough Cold Front Cloud System at Mountain Taihang based on Aircraft Observations

  • SUN Yuwen ,
  • DONG Xiaobo ,
  • LI Baodong ,
  • DUAN Ying ,
  • HU Xiangfeng ,
  • YANG Yang ,
  • Lü Feng ,
  • FAN Rong ,
  • KANG Zengmei ,
  • WANG Jianheng ,
  • ZHAO Xiaowei ,
  • YANG Yongsheng ,
  • FAN Hao ,
  • LI Dejun
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  • key laboratory of meteorology and ecology of Hebei/Hebei weather modification office, Shiajiazhuang 050021, Hebei, China;Hebei Provincial Meteorological Bureau, Shiajiazhuang 050021, Hebei, China;Hengshui meteorological bureau, Hengshui 053000, Hebei, China;Xingtai meteorological bureau, Xingtai 054000, Hebei, China;Hubei Provincial Meteorological Service Center, Wuhan 430205, Hubei, China

Received date: 2018-01-23

  Online published: 2019-10-28

Abstract

A cold front precipitation process caused by low trough occurred in Hebei province on May 22, 2017. The Hebei weather modification office used an airborne particle measurement system to carry out five vertical soundings for the stratiform clouds with embedded convections developed in the eastern Taihang mountain. In this paper, the microphysical structure of stratiform clouds with embedded convections and the conditions for cloud seeding were both analyzed based on the data from aircraft observations, The meteorological radar in Shijiazhuang and the Ka-band cloud radar at Huangsi, Xingtai. The precipitation clouds were found in the southwesterly air current before the low trough as the stratiform clouds with embedded convections were composed of both cold and warm clouds. Our results showed that the clouds were thicker than 5 km and the thicknesses of warm and cold clouds were greater than 2 km and 3 km respectively. The height of 0℃ layer was located at 3577~4004 m, while the temperature at the bottom and top of the clouds were 15.4℃ and -17℃ respectively. A 45 dBZ radar reflectivity was detected indicating as the strongest echo of convection bubble within the clouds. However, to carry out cloud seeding, the strongest radar echo should be less than 40 dBZ and in the seeding area of convective stratiform clouds above 4000 m the radar echo should be less than 30 dBZ. The supercooled water was found in the upper-middle layers of the cold cloud above 5000 m with a content of 0.2 g·m-3. This supercooled water content would be 2~4 times richer than that of stable stratiform clouds would contain. Besides, abundant supercooled water was observed along the initial and development stage of convective bubbles. Since this layer was the key area for ice crystal growth and the temperature varied from -15℃ to -5℃, this cloud was suitable for seeding.

Cite this article

SUN Yuwen , DONG Xiaobo , LI Baodong , DUAN Ying , HU Xiangfeng , YANG Yang , Lü Feng , FAN Rong , KANG Zengmei , WANG Jianheng , ZHAO Xiaowei , YANG Yongsheng , FAN Hao , LI Dejun . The Physical Properties and Seeding Potential Analysis of a Low Trough Cold Front Cloud System at Mountain Taihang based on Aircraft Observations[J]. Plateau Meteorology, 2019 , 38(5) : 971 -982 . DOI: 10.7522/j.issn.1000-0534.2018.00112

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