高原气象

高原气象 >

2020 , Vol. 39 >Issue 4: 729 - 739

DOI: https://doi.org/10.7522/j.issn.1000-0534.2020.00010

论文

黄土高原塬区近地面层重力波的辨识及其特征研究

  • 张署林 ,
  • 陈晋北 ,
  • 余晔 ,
  • 赵素平 ,
  • 贾伟
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  • <sup>1.</sup>中国科学院西北生态环境资源研究院/寒旱区陆面过程与气候变化重点实验室, 甘肃 兰州 730000;<sup>2.</sup>中国科学院大学, 北京 100049

收稿日期: 2019-09-17

  网络出版日期: 2020-08-28

基金资助

国家自然科学基金项目(41675014)

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Atmospheric Surface-layer Gravity Waves over the Loess Plateau: Observational Identification and Characterization

  • Shulin ZHANG ,
  • Jinbei CHEN ,
  • Ye YU ,
  • Suping ZHAO ,
  • Wei JIA
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  • <sup>1.</sup>Key Laboratory of Surface Process and Climate Change in Cold and Arid Regions, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Science, Lanzhou 730000, Gansu, China;<sup>2.</sup>University of Chinese Academy of Science, Beijing 100049, China

Received date: 2019-09-17

  Online published: 2020-08-28

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摘要

利用平凉陆面过程与灾害天气观测研究站2012年5 -7月夜间近地面层观测资料, 针对黄土高原塬区夜间不同风速和下垫面粗糙度条件, 辨识塬区重力波, 揭示重力波的频段, 并对比研究了风速和粗糙度变化对该频段的影响。结果表明, 平凉站塬区的夜间近地面层易于产生重力波, 且即使整体Richardson远小于0.25时, 也可以观测到重力波。受塬区下垫面特征影响, 重力波的波动周期主要集中于60~110 s, 同时随着观测高度的降低, 重力波波动周期只存在10 s左右的变化。

关键词： 重力波; 湍流谱; 衰减律; 近地面层; 黄土高原

本文引用格式

张署林 , 陈晋北 , 余晔 , 赵素平 , 贾伟 . 黄土高原塬区近地面层重力波的辨识及其特征研究[J]. 高原气象, 2020 , 39(4) : 729 -739 . DOI: 10.7522/j.issn.1000-0534.2020.00010

Abstract

To identify gravity waves, determine their frequency band and reveal the variation of frequency band caused by wind speed and roughness, observation of surface layer have been done at night from May to July in 2012 at Pingliang Land Surface Process & Severe Weather Research Station.The results show that the tableland, where the observation station is located, is prone to cause gravity wave in surface layer under stable stratification conditions at night.Moreover, the gravity waves can be observed even when the total Richardson is way below 0.25.Affected by the tableland, the fluctuation period of the gravity wave mainly focuses on 60~110 s.Meanwhile, with the decrease of the observation height, the fluctuation period of the gravity wave only varies for about 10 s.

Key words： Gravity wave; turbulence spectrum; decay rate; surface layer; Loess Plateau

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