基于新型往返式探空观测的大气湍流特征分析  

Feature Extraction and Analysis of Atmospheric Turbulence Based on New Round-Trip Radiosonde

作　　者：杨晨义 曹晓钟[2] 郭启云[2] 袁源 YANG Chenyi;CAO Xiaozhong;GUO Qiyun;YUAN Yuan(Key Laboratory for Semi-Arid Climate Change of the Ministry of Education,College of Atmospheric Sciences,Lanzhou University,Lanzhou,730000;Meteorological Survey Center,China Meteorological Administration,Beijing 100081)

机构地区：[1]兰州大学大气科学学院半干旱气候变化教育部重点实验室,兰州730000 [2]中国气象局气象探测中心,北京100081

出　　处：《大气科学》2023年第6期1967-1982,共16页Chinese Journal of Atmospheric Sciences

基　　金：科技部重大自然灾害监测预警与防范重点专项2018YFC1506201,2018YFC1506204;国家重点研发计划项目2016YFC0401003;国家自然科学基金重点项目41430425。

摘　　要：利用2018年6月2日至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 m,延伸至大约30 km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(代表ε的量级)分布具有两个模态,分别以-35 m^(2)s^(-3)和-5 m^(2)s^(-3)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,湍流强度受L_T与N~2的配置影响,并且对流层与平流层的特征相反。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。Based on the round-trip radiosonde test 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 using the Thorpe analysis method.The probability,horizontal,and vertical distribution features are also analyzed.This radiosonde data has high observation accuracy and a vertical resolution of 6–10 meters,extending to an altitude of about 30 kilometers.Turbulence can be measured throughout the troposphere and lower stratosphere.Based on turbulence characteristics analysis,this study compares the differences between stations and observation results in the rising and falling sections.The logarithmic turbulent dissipation rate representing the magnitude of has two modes that decrease to both sides,with peak centers at-35 m^(2)s^(-3)and-5 m^(2)s^(-3),respectively.The troposphere is more concentrated in the peak center than the stratosphere,and the troposphere’s peak center value is slightly larger than that of the stratosphere,indicating that the turbulence in the stratosphere is relatively weaker than that in the troposphere.The horizontal and vertical distribution of the three parameters of logarithmic turbulence dissipation rate,Thorpe scale,and buoyancy frequency shows that the configuration of L_(T)and N^(2)affects turbulence intensity,and the troposphere and stratosphere features are opposite.This research reveals the potential of high-resolution round-trip radiosonde network observation data for studying free atmospheric turbulence characteristics and its advantages over traditional radiosonde data.

关 键 词：湍流层 往返式探空资料 下投探空 Thorpe分析 

分 类 号：P401[天文地球—大气物理学与大气环境]