南京地区一次降水过程湍流特征研究*

南京大学学报(自然科学版) ›› 2011, Vol. 47 ›› Issue (6): 703–711.

南京地区一次降水过程湍流特征研究*

杜云松¹，彭珍^1,2，张宁¹，宋丽莉²

出版日期:2015-05-09 发布日期:2015-05-09
作者简介: (1.南京大学大气科学学院，南京，210093;2.中国气象局热带海洋气象研究所，510080)
基金资助:
国家自然科学基金(40905002,40775071)，南京大学新教师基金(20090091120039)，国家重点基础研究发展计划(2010(:B428501)

Turbulent characteristics of surface layer during
a heavy precipitation event over the Nanjing area，eastern China

Du Yun Son; ¹，Peng Zhen¹，Zhang Ning¹，Sonh Li一Li ²

Online:2015-05-09 Published:2015-05-09
About author: (1. School of Atmospheric Science，Nanjing University, Nanjing, 210093，China;2. Guangzhou Institute of
Tropical and Marine Metcorology, China Metcorological Administration, Guangzhou，510080，China)

摘要/Abstract

摘要： 利用南京大学浦II校区大气科学园的近地层湍流脉动资料及Meteorological information Comprehensive Analysis and Process System气象数据资料，针对2008年5月南京地区一次降水过程，
分析比较了降水前后的湍流强度、归一化湍流动能、近地层通量输送和速度能谱特征.结果表明:从气象要素上看，降水临近时风速变化大，温度、气压降低明显，降水期间湿度很高.从湍流特征上看，降水时湍
流强度突变增大，归一化湍流动能也变大，湍流活动增强;u、υ 方向动量输送一u ω一υ ω强度都增大，但输送方向相反，此时近地层归一化摩擦速度也明显变大;感热通量ωT，迅速减小，甚至微弱逆向输送;
降水前后风速能谱惯性副区基木满足Kolmogorov的一2/3次方律，降水时u、υ 能谱低频段峰值频率左移明显，分析低频段峰值对应涡的尺度发现，近地层中降水前后贡献湍流能量最大的涡尺度存在很大差异.

Abstract: We measured the surface layer turbulence data in the Pukou Campus of Nanjing University, In a combination with the datasets from Meteorological information Comprehensive Analysis and Process System, a
heavy precipitation process over the Nanjing area in May 2008 is discussed here.Turbulence，its intensity, normalized kinetic energy, surface layer turbulence flux as well as the energy spectrum of wind speed arc specifically
analyzed to illustrate progressing states of precipitation. By contrasting different states in a temporal sequence, we obtain several conclusions; as to meteorological elements, wind speed sharply increased along with a significant
decrease of air temperature and pressure when rain was approaching. During the rain, surface layer humidity remained high; when it comes to turbulent characteristics, turbulence intensity and normalized turbulence kinetic
energy increased sharply. Specifically, vertical momentum flux of a and v both intensified in magnitude but transferred reverscly. Meanwhile, the sensible heat flux decreased rapidly to zero，even slightly negative. In the
wind spectrum, the inertial sub-range adjusted to Kolmogorov’s一2/3 law at any time of the experiment.However, the frequency at the low end peaked pronouncedly much more left. With further interpretation on
corresponding vortex scales，great differences are observed with the progressing of precipitation itself.

杜云松¹，彭珍^1,2，张宁¹，宋丽莉². 南京地区一次降水过程湍流特征研究*[J]. 南京大学学报(自然科学版), 2011, 47(6): 703–711.

Du Yun Son; ¹，Peng Zhen¹，Zhang Ning¹，Sonh Li一Li ²
. Turbulent characteristics of surface layer during
a heavy precipitation event over the Nanjing area，eastern China[J]. Journal of Nanjing University(Natural Sciences), 2011, 47(6): 703–711.

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