Circulation and Eddy Kinetic Energy Budget Analyses on the Evolution of a Northeast China Cold Vortex (NCCV) in May 2010
Circulation and Eddy Kinetic Energy Budget Analyses on the Evolution of a Northeast China Cold Vortex (NCCV) in May 2010
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DOI：
10.2151/jmsj.2012-408
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发表时间：
2012-08
影响因子：
3.1
通讯作者：
S. Fu;Jianhua Sun
中科院分区：
文献类型：
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作者：
S. Fu;Jianhua Sun
利用天气研究与预报模式（WRF）成功地模拟了2010年5月18日00：00 ~ 5月20日03：00（UTC）持续约51 h的东北冷涡（NCCV），并在东北地区产生了多次强降水过程。在此基础上，对NCCV进行了详细的分析。天气学分析表明，NCCV自上而下发展，最后伸展到900-200 hPa的最大垂直范围。对流层中下部的对流层中心冷，对流层上部的对流层中心暖。在整个过程中，暖平流和冷平流都很明显，有利于有效位能的增强，有利于低涡的维持。准拉格朗日形式的涡动通量环流（EFC）和涡动动能（EKE）收支分析的结果表明，不同的因素控制的NCCV在其演变的不同阶段。对于EFC收支，NCCV与背景环流的相互作用比涡旋与其他天气系统的相互作用更重要;相反，对于EKE收支，NCCV与其他天气扰动的相互作用更重要。环境环流的模式是非常重要的NCCV，因为涡加强，因为它从低涡度或EKE的地区移动到具有较高的值。NCCV的斜压能量转换明显大于正压能量转换，是一个典型的斜压气旋。在衰减阶段，NCCV的衰减与斜压Rossby波的频散过程密切相关。
A typical Northeast China cold vortex (NCCV) that lasted for approximately 51 hours (from 0000 UTC 18 May to 0300 UTC 20 May, 2010) and produced several heavy rainfall events over Northeast China was successfully simulated using the Weather Research and Forecasting Model (WRF). Based on this successful simulation, the NCCV was analyzed in detail. Synoptic analyses revealed that the NCCV developed downward from the top and finally stretched to a maximum vertical extension of 900–200 hPa. The NCCV was colder than its surroundings in the middle-lower troposphere, whereas in the upper troposphere, it was warmer than its surroundings. There were significant warm and cold advections for the duration of the NCCV, favoring the enhancement of available potential energy (APE) and conducive to sustaining the vortex. The results of the quasi-Lagrange-form eddy flux circulation (EFC) and eddy kinetic energy (EKE) budget analyses indicate that different factors dominated the NCCV in various stages of its evolution. As for the EFC budget, the interactions between the NCCV and back ground circulations were more important than the interactions between the vortex and other synoptic systems; in contrast, for the EKE budget, the interactions between the NCCV and other synoptic perturbations were more important. The pattern of environmental circulations was very important to the NCCV because the vortex intensified as it moved from areas of low vorticity or EKE to areas with higher values. The baroclinic energy conversion was much greater than the barotropic energy conversion during the life cycle of the NCCV, implying that the NCCV was a typical baroclinic cyclone. Moreover, during the decaying stage, the attenuation of the NCCV appeared to be closely related to the frequency dispersion processes of the baroclinic Rossby wave.