| 等熵面和湿等熵面倾斜发展的诊断分析 |
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| 引用本文： | 冉令坤,楚艳丽.等熵面和湿等熵面倾斜发展的诊断分析[J].大气科学,2007,31(4):655-665. |
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| 作者姓名： | 冉令坤 楚艳丽 |
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| 作者单位： | 1.中国科学院大气物理研究所,北京,100029 |
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| 摘 要： | 利用等压坐标系中的热力学方程和水汽方程推导出可以诊断分析等熵面（等位温面）和湿等熵面（等相当位温面） 倾斜变化的倾角方程。等熵面倾角的局地变化由倾角平流输送项、风速切变项和非绝热加热项共同决定，而影响湿等熵面倾角局地变化的强迫项除倾角平流输送项、风速切变项和非绝热加热项之外，还包括垂直热量通量切变项。NCEP/NCAR实时分析资料的分析结果表明，大气斜压性、相对垂直涡度与等熵面和湿等熵面的倾角密切相关，它们的正高值区互相重叠；垂直风速切变项，特别是垂直速度的经向切变项是影响等熵面倾斜发展的主要强迫项，而纬向和经向风速的垂直切变项对湿等熵面倾角演变的贡献最大。
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| 关 键 词： | 等熵面 湿等熵面 倾角 斜压矢量 相对垂直涡度 |
| 文章编号： | 1006-9895（2007）04-0655-11 |
| 修稿时间： | 2006-01-042006-05-08 |
Diagnosis of the Slantwise Development of Isentropic and Moist Isentropic Surfaces |
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| RAN Ling-Kun and CHU Yan-Li.Diagnosis of the Slantwise Development of Isentropic and Moist Isentropic Surfaces[J].Chinese Journal of Atmospheric Sciences,2007,31(4):655-665. |
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| Authors: | RAN Ling-Kun and CHU Yan-Li |
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| Institution: | 1 Institute of Atmospheric Physics, ChineseAcademy of Sciences, Beijing 100029; 2 Institute of Urban Meteorology, China Meteorological Administration, Beijing 100089 |
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| Abstract: | The inclination equations for isentropic and moist isentropic surfaces,which can be used to diagnose the slantwise evolution of isentropic and moist isentropic surfaces,are derived from the thermodynamic and water vapor equations in isobaric coordinates.It is shown that the local change of inclination of isentropic surface is dominated by the terms associated with advection,velocity shear and diabatic heating.Besides the three terms mentioned above,the forcing terms in the inclination equation of moist isentropic surface includes the term of vertical and meridional shears of vertical heating flux.The analysis of NCEP/NCAR data reveals that the positive high-valued areas of atmospheric baroclinicity,relative vertical vorticity are mainly located in the positive high-valued areas of inclinations of isentropic and moist isentropic surfaces.This indicates that the atmospheric baroclinicity,relative vertical vorticity are closely related to the inclinations of isentropic and moist isentropic surfaces.The term of vertical velocity shear,especially the term associated with meridional shear of vertical velocity is the chief factor affecting the slantwise development of isentropic surface.The contribution coming from the terms associated with vertical shear of zonal and meridional velocities to the slantwise evolution of moist isentropic surface is much more important than that of the other forcing terms in the inclination equation of moist isentropic surface. |
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| Keywords: | isentropic surface moist isentropic surface inclination baroclinic vector relative vertical vorticity |
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