不同下垫面温度和湿度湍流谱特征研究

北京大学学报（自然科学版）

不同下垫面温度和湿度湍流谱特征研究

刘明星¹, 张宏升¹, 宋星灼¹, 康凌², 陈家宜¹

¹北京大学物理学院大气科学系，中韩大气研究中心，北京 100871；²北京大学环境科学与工程学院环境科学系，北京100871；

收稿日期:2007-05-30 出版日期:2008-05-20 发布日期:2008-05-20

Spectral Characteristics of Atmospheric Turbulence over Various Surface Conditions

LIU Mingxing¹, ZHANG Hongsheng¹, SONG Xingzhuo¹, KANG Ling², CHEN Jiayi¹

¹Department of Atmospheric Science, Peking University, Center of Sino-Korean Atmospheric Science， Beijing 100871;²College of Environmental Sciences and Engineering, Peking University， Beijing 100871;

Received:2007-05-30 Online:2008-05-20 Published:2008-05-20

摘要/Abstract

摘要： 利用相同探测设备、相同试验方法在戈壁、草原、郊区和城郊等不同下垫面开展的多次重复湍流观测实验资料，采用相同的湍流数据采集和处理方法，研究了不同下垫面温度和湿度湍流谱特征。研究表明：归一化的温度和湿度谱的高频段满足-2/3幂次律，低频段谱曲线相对集中在较窄的范围内，不呈现随稳定度参数z/L规则散布；较湿润地区的湿度谱曲线与温度谱十分相似，谱形一致；平坦地形谱曲线比粗糙下垫面要开阔、平缓；粗糙下垫面的谱曲线较为尖锐，“拐点”对应的无因次频率约为0.1；高粗糙度下垫面的高频段谱曲线高于平坦地形，说明高粗糙度地区的局地湍流耗散较强。戈壁下垫面的低频段湿度谱数值明显高于其他地区。研究还发现，稳定层结下，由于大尺度过程和重力波的共同作用，在分析双峰数据时应慎重。

关键词: 湍流谱特征, 地表粗糙度, 观测法

Abstract: A comprehensive study of spectral characteristics of atmospheric turbulence over different surface conditions, including the Gobi desert, grassland, suburban and urban area, outskirts was carried out. The turbulent data were collected by the same personnel, sound instrumentation, turbulent data acquisition system and turbulent processing system. Results show that thelower frequency portion of temperature and humidity spectra reveals a flatter peak than that at the upper level of urban area. Spectra curves do not reveal a regular changing tendency according to their stability conditions, but converge to a very narrow bend in both the lower and higher frequency portions. The value of humidity spectra in low-frequency in Gobi is higher than that in other sites. The humidity characteristics are similar with temperature in humid regions.

Key words: spectral characteristics, roughness, observation method

中图分类号:

P425

刘明星, 张宏升, 宋星灼, 康凌, 陈家宜. 不同下垫面温度和湿度湍流谱特征研究[J]. 北京大学学报（自然科学版）.

LIU Mingxing,ZHANG Hongsheng,SONG Xingzhuo,KANG Ling,CHEN Jiayi. Spectral Characteristics of Atmospheric Turbulence over Various Surface Conditions[J]. Acta Scientiarum Naturalium Universitatis Pekinensis.

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链接本文: https://xbna.pku.edu.cn/CN/

https://xbna.pku.edu.cn/CN/Y2008/V44/I3/391

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