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气象:2015,41(5):554-565
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一次引发强降水的东北冷涡的演变机理及能量特征研究
(1.中国科学院大气物理研究所,北京 100029;2.中国科学院大气物理研究所,北京 100029 南京信息工程大学气象灾害预报预警与评估协同创新中心,南京 210044;3.中国气象局气象干部培训学院辽宁分院,沈阳 110000;4.河北省气象局,石家庄 050021)
Study on Evolution Mechanisms and Energy Features of Northeast Cold Vortex with Heavy Rainfall Events
(1.Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029;2.Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029 Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters,Nanjing University of Information Science and Technology, Nanjing 210044;3.China Meteorological Administration Training Centre, Liaoning Branch, Shenyang 110000;4.Hebei Meteorological Bureau, Shijiazhuang 050021)
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投稿时间:2014-09-14    修订日期:2015-04-15
中文摘要: 采用NCEP CFS 0.5°×0.5°的再分析资料,中国气象局常规地面观测资料和FY 2E卫星TBB资料对2013年7月上旬的一次引发强降水过程的东北冷涡典型个例进行了深入分析和诊断,研究表明:(1)本例冷涡的发展期是其降水和对流活动的最活跃时期,其对应的最小TBB在-60℃以下,最强6 h降水可达124 mm,南海、黄海和日本海是冷涡降水的主要水汽源地。(2)本例东北冷涡是一个深厚的斜压涡旋系统,其最强斜压区和动能大值区主要位于涡旋外围;冷涡的冷心结构主要位于对流层中高层和对流层低层。(3)涡度收支表明,与对流活动密切相关的垂直涡度平流是本次冷涡产生的主导因子;涡度垂直输送和辐合作用是冷涡快速发展的主导因子;而辐散作用则最终导致了冷涡的消亡。(4)能量收支表明,旋转风动能制造是冷涡生成过程中动能的主要产生方式,而冷涡发展期,旋转风动能输送是冷涡动能维持的主导因子。
Abstract:On the basis of NCEP CFS reanalysis data with a resolution of 0.5°×0.5°, conventional surface observation and FY 2E satellite data from the China Meteorological Administration, detailed investigation was conducted to one northeast cold vortex (NECV) that caused several heavy rainfall events. The results indicate that the developing stage of the NECV is the most active period for convective activities and precipitation. Minimum TBB during the lifetime of the vortex is below -60℃, and maximum precipitation is 124 mm. The South China Sea, the Yellow Sea and the Japan Sea are main moisture sources for the heavy rainfall events associated with the NECV. The NECV is a kind of deeply developed baroclinic vortex system with its strong baroclinicity and kinetic energy zones mainly located at the peripheral regions around the vortex. Cold regions associated with the vortex mainly appear in mid upper troposphere and lower troposphere. Vorticity budget indicates that the vertical advection of vorticity that is closely related to convective activities dominate the formation of the NECV; the vertical advection of vorticity and the convergence effects are the most favorable factors to the rapid development of the vortex; and the divergence effects dominate the dissipation of the NECV. Kinetic energy budget indicates that the kinetic energy production by the rotational wind is the most favorable factor to the vortex during the formation stage; and during the maintaining stage, transport of kinetic energy by the rotational wind is the dominant factor to the sustainment of kinetic energy associated with the NECV.
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基金项目:国家重点基础研究发展计划(973计划)(2012CB417201)和国家自然科学基金项目(41205027和41375053)共同资助
引用文本:
傅慎明,孙建华,张敬萍,李崴,2015.一次引发强降水的东北冷涡的演变机理及能量特征研究[J].气象,41(5):554-565.
FU Shenming,SUN Jianhua,ZHANG Jingping,LI Wei,2015.Study on Evolution Mechanisms and Energy Features of Northeast Cold Vortex with Heavy Rainfall Events[J].Meteor Mon,41(5):554-565.