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气象:2018,44(6):759-770
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两次MCC红外云图特征与天气实况异同性分析
万夫敬,刁秀广
(青岛市气象局,青岛 266003; 山东省气象局,济南 250031; 青岛市气象灾害防御工程技术研究中心,青岛 266003)
Comparative Analysis on Cloud Evolution Features and Weather of Two MCCs
WAN Fujing,DIAO Xiuguang
(Qingdao Meteorological Bureau, Qingdao 266003; Shandong Meteorological Service, Jinan 250031; Qingdao Engineering Technology Research Center for Meteorological Disaster Prevention, Qingdao 266003)
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投稿时间:2017-03-01    修订日期:2017-09-05
中文摘要: 利用FY-2E红外云图、多普勒雷达资料,结合环境形势及物理量场,分析了2011年8月15—16日(简称“0815MCC”)山东北部和河北南部、2015年7月30—31日(简称“0730MCC”)山东中部和南部地区两次中尺度对流复合体(MCC)产生的区域性暴雨过程。结果表明:(1)两次MCC过程,降水集中在MCC形成到成熟阶段。强降水分布都具有非对称性,主要在风暴传播方向上黑体亮温(TBB)冷中心附近及其西侧和南侧。地面中尺度辐合系统的强度、移向与新生单体的发展密切相关。(2)正涡度高值区、散度和垂直速度的负值中心的重叠区具有显著的动力条件,对MCC具有强“吸引力”,导致明显的后向传播特征。(3)雷达VWP产品显示,有超低空急流的建立,为MCC的形成与维持提供了能量与动力条件。低层风之间的辐合切变,为新对流单体的生成提供了抬升触发机制。当相邻雷达之间的速度差迅速增大时,强降水开始。(4) “0815MCC”的-52℃冷云面积是“0730MCC”的4倍,TBB比“0730MCC”平均低10℃。“0815MCC”低层辐合和高层辐散更强烈,能量更集中,使风暴发展更高,云顶亮温更低;风暴顶强烈辐散将云中冰晶粒子等带到更远的高空,在红外云图上出现较大的冷云面积;同时“0815MCC”强垂直风切变将高空冰晶粒子带到云砧处造成蒸发,降低了降水效率,导致“0815MCC”过程暴雨范围和降水强度小于“0730MCC”。
Abstract:By using satellite images, weather radar data, combined with the environmental situation and physical characteristics, two mesoscale convective complex (MCC) events in northern Shandong and southern Hebei in 15-16 August 2011 (“0815MCC”), and central and southern regions of Shandong in 30-31 July 2015 (“0730MCC”) are analyzed. Comparisons show that (1) the distribution of heavy rainfall is asymmetric, mainly in the center of TBB and its west and south side. The precipitation is concentrated in the stage from formation to mature stage of MCC. The intensity and moving direction of surface mesoscale convergence system are closely related to the development of new cells. (2) The overlapping area of the high vorticity, divergence and vertical velocity is favorable for the development of MCC, which is the main factor for its movement toward southwest. (3) Radar VWP product shows that the establishment of the ultra-lower-level jet helps the happening of severe precipitation and maintenance of MCC. When the ultra-low-level jet velocity difference increases to a certain extent, the heavy rainfall begins. (4) The low-level convergence and high-level divergence of “0815 MCC” offer dynamic conditions, causing higher development, lower cloud top temperature, larger area of cold cloud than “0730 MCC”; meanwhile, the strong vertical wind shear brings the ice crystals to the thunder head, which may reduce the precipitation efficiency, so the 0815 MCC’s rainstorm range and maximum precipitation intensity are less than those of “0730 MCC”.
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基金项目:青岛市气象局青年科研专项(2016qdqxq1)、山东省自然科学基金项目(ZR2016DM20)和国家自然科学基金项目(41375120)共同资助
引用文本:
万夫敬,刁秀广,2018.两次MCC红外云图特征与天气实况异同性分析[J].气象,44(6):759-770.
WAN Fujing,DIAO Xiuguang,2018.Comparative Analysis on Cloud Evolution Features and Weather of Two MCCs[J].Meteor Mon,44(6):759-770.