双月刊

ISSN 1006-9895

CN 11-1768/O4

基于新型往返式探空观测的大气湍流特征提取及其分析
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作者单位:

1.兰州大学;2.中国气象局气象探测中心

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基金项目:

科技部重大自然灾害监测预警与防范重点专项(2018YFC1506201、204),国家重点研发计划项目(2016YFC0401003),国家自然科学基金重点项目(41430425)


Feature extraction and analysis of Atmospheric Turbulence Based on new round trip radiosonde
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Affiliation:

1.Meteorological survey center, China Meteorological Administration;2.Lanzhou University

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    摘要:

    利用2018年6月2日到2019年11月14日,安庆、长沙、赣州、南昌、宜昌、武汉6个站点的往返式探空试验数据,使用Thorpe分析方法计算了湍流层厚度、对数湍流耗散率、Thorpe尺度、浮力频率并进行概率、水平、垂直等分布特征的分析。这些探空数据观测精度较高,且垂直分辨率约为6-10米,延伸至大约30公里的高度,可以在整个对流层和平流层下部估计湍流。本研究基于湍流特征分析,比较了各个站点之间以及上升段与下降段之间的差异。对数湍流耗散率〖log〗_10 ε具有两个模态,分别以-35和-5附近为峰值中心并向两侧递减。对流层的分布相对于平流层更加集中,且对流层的峰值中心的数值略大于平流层中心,这说明平流层的湍流强度稍弱于对流层。从对数湍流耗散率〖log〗_10 ε、Thorpe尺度L_T、浮力频率N^2 三个参数的水平和垂直分布可以看出,在L_T较大且N^2较小的位置湍流强度更大。本研究揭示了高分辨率的往返式探空组网观测数据用于自由大气湍流特征研究的潜力,以及其相对于传统探空数据的时空加密观测优势。

    Abstract:

    Based on the round-trip radiosonde data of Anqing, Changsha, Ganzhou, Nanchang, Yichang and Wuhan from June 2, 2018 to November 14, 2019, the turbulent layer thickness, logarithmic turbulent dissipation rate, Thorpe scale and buoyancy frequency are calculated by using Thorpe analysis method, and the probability, horizontal and vertical distribution characteristics are extracted. These radiosonde data have high observation accuracy, and the vertical resolution is about 6-10 meters, extending to about 30 kilometers, which can estimate the turbulence in the whole troposphere and lower stratosphere. Based on the turbulence feature extraction, this study carried out research and analysis, and compared the differences between different stations and the differences between the ascending and descending sections. The number of turbulent stratification in the troposphere is slightly more than that in the stratosphere, and the maximum turbulent layer thickness is also slightly larger. The number of turbulent stratification in the ascending section is slightly more than that in the descending section. The logarithmic turbulent dissipation rate has two modes, which decrease to both sides with the peak centers around - 35 and - 5 respectively. The troposphere is more concentrated in the peak center than the stratosphere, and the value of the peak center of the troposphere is slightly larger than that of the stratosphere, which indicates that the turbulence in the stratosphere is relatively weaker than that in the troposphere. From the horizontal and vertical distribution and configuration of logarithmic turbulence dissipation rate, Thorpe scale and buoyancy frequency, it can be seen that the turbulence intensity is higher at the position with larger Thorpe scale and lower buoyancy frequency.

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历史
  • 收稿日期:2021-06-20
  • 最后修改日期:2022-02-28
  • 录用日期:2022-05-31
  • 在线发布日期: 2022-06-15
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