Macro-and Micro-physical Characteristics of Different Parts of Mixed Convective-stratiform Clouds and Differences in Their Responses to Seeding  

作　　者：Dejun LI Chuanfeng ZHAO Peiren LI Cao Liu Dianli GONG Siyao LIU Zhengteng YUAN Yingying CHEN 

机构地区：[1]Hubei Meteorological Service Center,Wuhan 430205,China [2]College of Global Change and Earth System Science,Beijing Normal University,Beijing 100875,China [3]Weather Modification Office of Shanxi Province,Taiyuan 030032,China [4]Wuhan Central Meteorological Observatory,Wuhan 430074,China [5]Weather Modification Office of Shandong Province,Jinan 250031,China

出　　处：《Advances in Atmospheric Sciences》2022年第12期2040-2055,共16页大气科学进展（英文版）

基　　金：supported by the National Key Research and Development Project(Grant No.2019YFA0606803,2016YFA0601704);the National Natural Science Foundation of China(Grant No.41925022);the Innovation and Development Project of China Meteorological Administration(CXFZ2022J036);the Science and Technology Development Fund of Hubei Meteorological Bureau(Grant No.2017Y06,2017Y07,2016Y06,2019Y10).

摘　　要：This study investigates the cloud macro-and micro-physical characteristics in the convective and stratiform regions and their different responses to the seeding for mixed convective-stratiform clouds that occurred in Shandong province on 21 May 2018,based on the observations from the aircraft,the Suomi National Polar-Orbiting Partnership(NPP)satellite,and the high-resolution Himawari-8(H8)satellite.The aircraft observations show that convection was deeper and radar echoes were significantly enhanced with higher tops in response to seeding in the convective region.This is linked with the conversion of supercooled liquid droplets to ice crystals with released latent heat,resulting in strengthened updrafts,enhanced radar echoes,higher cloud tops,and more and larger precipitation particles.In contrast,in the stratiform cloud region,after the Silver Iodide(AgI)seeding,the radar echoes become significantly weaker at heights close to the seeding layer,with the echo tops lowered by 1.4–1.7 km.In addition,a hollow structure appears at the height of 6.2–7.8 km with a depth of about 1.6 km and a diameter of about 5.5 km,and features such as icing seeding tracks appear.These suggest that the transformation between droplets and ice particles was accelerated by the seeding in the stratiform part.The NPP and H8 satellites also show that convective activity was stronger in the convective region after seeding;while in the stratiform region,a cloud seeding track with a width of 1–3 km appears 10 km downstream of the seeding layer 15 minutes after the AgI seeding,which moves along the wind direction as width increases.

关 键 词：airborne Ka-band Precipitation Radar(KPR) mixed convective-stratiform clouds convective region stratiform region cloud seeding cloud microphysical properties 

分 类 号：P426[天文地球—大气科学及气象学]