气象2025，Vol.51Issue(5)：529-541,13.DOI:10.7519/j.issn.1000-0526.2025.040101
探空气球漂移对微波辐射计与探空温度差异的影响
Impact of Sounding Balloon Drift on Temperature Differences Between Microwave Radiometer and Radiosonde
摘要
Abstract
To evaluate the reliability of the atmospheric temperature profiles retrieved by the microwave radiometer(MWR)and the impact of sounding balloon drift on the temperature differences(δT)between MWR and radiosonde,more than two years of temperature profiles derived from MWR of Xi'an Jinghe Station in Shaanxi Province are tested against those from radiosondes.A method for quantitative assessment of bias in radiosonde temperature caused by the drift of sounding balloon is proposed.It is demonstrated that there are significant spatial and temporal changes in the consistency of the temperatures acquired by MWR(TM)and radiosonde(TS).The correlation coefficients between TM and TS are found to be higher in spring and autumn than in summer and winter,and better correlation is always detected at lower altitudes in all seasons.At a given altitude,the δT is significantly negatively correlated to the ambient temperature represented by Ts.The higher the temperature,the more obvious the underestimation of the temperature by the MWR,and vice versa.This leads to a phenomenon of"overestimating low temperature and underestima-ting high temperature",which is more obvious at high altitudes than at low altitudes,and more obvious in winter and summer than in spring and autumn.The drift of sounding balloon causes the sounding tempera-ture to be higher than the actual temperature right above the radiosonde sites in all seasons,and the biases in radiosonde temperature records are negatively correlated to the ambient temperature.Therefore,sound-ing balloon drift causes mean deviation(MD)to be overestimated,and the degree of dispersion in δT to be underestimated,resulting in underestimation of the correlation between δT and ambient temperature as well as the severity of"overestimating low temperature and underestimating high temperature"of MWR.Overall,the influence of sounding balloon drift on the standard deviation of δT and root mean square devi-ation(RMSD)of the microwave radiometer and radiosonde temperature is below 2％,and its contribution to δT is much smaller than that of the retrieval algorithm.关键词
微波辐射计/探空气球漂移/温度廓线/探空Key words
microwave radiometer/sounding balloon drift/temperature profile/radiosonde分类
大气科学引用本文复制引用
董自鹏,李星敏,彭艳,赵奎锋,杜怡心,白水成..探空气球漂移对微波辐射计与探空温度差异的影响[J].气象,2025,51(5):529-541,13.基金项目
国家自然科学基金青年科学基金项目(41905016)、中国气象局创新发展专项(CXFZ2024P021、CXFZ2022P021)和陕西省重点研发计划(2024SF-YBXM-583、2023-YBSF-328)共同资助 （41905016）
