doi:  10.3878/j.issn.1006-9895.1812.18208
一次梅雨暴雨的动能谱特征分析及收支诊断

Kinetic energy spectrum analysis and budget diagnosis of a meiyu rainstorm
摘要点击 197  全文点击 53  投稿时间:2018-07-31  修订日期:2018-11-29
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基金:  北极阁开放研究基金-南京大气科学联合研究中心(NJCAR2018ZD03)
中文关键词:  梅雨暴雨,水平动能谱,涡旋动能,辐散动能,动能收支
英文关键词:  Mei-yu rainstorm, HKE, VKE, DKE, kinetic energy budget
              
作者中文名作者英文名单位
尹韩笑yin hanxiao国防科技大学气象海洋学院
张立凤zhanglifeng国防科技大学气象海洋学院
王羱wangyuan国防科技大学气象海洋学院
余世旺yushiwang国防科技大学气象海洋学院
张明阳zhangmingyang国防科技大学气象海洋学院
引用:尹韩笑,张立凤,王羱,余世旺,张明阳.2019.一次梅雨暴雨的动能谱特征分析及收支诊断[J].大气科学
Citation:yin hanxiao,zhanglifeng,wangyuan,yushiwang,zhangmingyang.2019.Kinetic energy spectrum analysis and budget diagnosis of a meiyu rainstorm[J].Chinese Journal of Atmospheric Sciences (in Chinese)
中文摘要:
      本文采用NCEP高分辨率资料利用WRF模式对一次梅雨暴雨进行数值模拟,基于可靠的模拟结果计算了水平动能谱、涡旋动能谱及辐散动能谱,并诊断了动能收支情况,揭示了梅雨暴雨的动能谱特征,探究中尺度动能谱形成和维持的机理。结果表明:梅雨暴雨的实际个例模拟中,不同高度层同样复制出谱转折特征,动能变化与降水强度呈正相关,潜热加热最强的高度层动能谱线更为平缓,且对流层低层谱线斜率变化明显大于高层。涡旋动能与辐散动能在不同高度层上也存在差异:对流层高层涡旋动能大于辐散动能,平流层低层辐散动能大于涡旋动能。不同高度层的动能主要贡献项有所区别,而暴雨不同阶段的主要贡献项的作用也存在差异:对流层高层,中尺度能量由非线性项和气压项贡献;平流层低层,气压项的作用更为明显。
Abstract:
      In order to reveal the kinetic energy spectrum characteristics of meiyu rainstorm and explore the formation and maintenance mechanism of meso-scale kinetic energy spectrum,NCEP high resolution data and wrf model were used to simulate a meiyu rainstorm. Based on reliable simulation results, horizontal kinetic energy spectrum(HKE), vortex kinetic energy(VKE) spectrum and divergence kinetic energy(DKE) spectrum were calculated, and the kinetic energy budget was diagnosed.The results show that in the actual case simulation of meiyu rainstorm, the spectral transition characteristics are also reproduced in different height layers.The kinetic energy change is positively correlated with the precipitation intensity. The peak height layer of latent heat heating has a more gentle kinetic energy line, and the slope change of the lower troposphere line is obviously larger than that of the upper troposphere line. There are also differences between VKE and DKE at different altitudes: in the upper troposphere,VKE is greater than DKE, and in the lower stratosphere,DKE is greater than VKE. The main contribution items of HKE in different height layers are different, and the effects of the main contribution items in different stages of rainstorm are also different: in the upper troposphere, the mesoscale energy is contributed by nonlinear terms and atmospheric pressure terms; In the lower stratosphere, the effect of the pressure term is more obvious.
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