基于掩星资料质量分析的大气参数反演电离层修正

发布时间：2018-05-08 06:22

本文选题：掩星大气探测 + 资料质量　；参考：《中国矿业大学》2017年硕士论文

【摘要】：掩星大气探测技术具有垂直分辨率高,精度高,成本低,全球覆盖等优点,目前已成为一种重要的大气探测手段。在对中性层大气参数的反演中,电离层对反演精度有较大影响,进行有效的电离层修正和电离层残余误差的改进具有重要意义。为探究电离层对掩星大气探测的影响,经过和再分析资料和探空资料的对比,在10~30km,COSMIC掩星资料的湿反演温度平均相对偏差一般在0.5%以内,折射率平均相对偏差在0.3%以内,但在低对流层的温度的相对偏差平均值和标准差较大,在上平流层折射率的相对偏差平均值和标准差较大。赤道附近低纬度区域掩星资料的质量比南北半球高纬度区域差,同一区域冬季和夏季的掩星资料质量比春季和秋季差。以上结果表明,大气探测的误差主要在低对流层和上平流层,低对流层主要受水汽的影响,上平流层主要受电离层影响,电离层电子密度较大的情况下,上平流层的大气参数的反演精度较差。经过不同的电离层修正方法的对比,表明弯曲角电离层修正方法要优于相位修正方法,但大气参数反演误差随着高度的增加而增大,表明仍然存在电离层残余误差,为进一步修正电离层残余误差,将掩星数据和MSIS的数据进行对比,得到的弯曲角度误差表明电离层残余误差在平流层上部表现为系统性偏差,利用一年的平均弯曲角度误差数据可以对单个掩星事件的电离层残余系统性偏差进行改进。
[Abstract]:The occultation atmosphere detection technology has many advantages such as high vertical resolution, high precision, low cost, global coverage and so on, so it has become an important means of atmospheric detection. In the inversion of atmospheric parameters of the neutral layer, the ionosphere has a great influence on the inversion accuracy. It is of great significance to correct the ionosphere effectively and to improve the residual error of the ionosphere. In order to investigate the influence of ionosphere on atmospheric occultation, the average relative deviation of wet inversion temperature and refractive index is within 0.5% and 0.3% respectively, after comparing with the reanalysis data and the sounding data. However, the relative deviation average and standard deviation of the temperature in the lower troposphere and the refractive index in the upper stratosphere are larger than those in the upper troposphere. The quality of occultation data in the low latitudes near the equator is worse than that in the upper latitudes of the northern and southern hemispheres, and the occultation data in winter and summer in the same region are worse than those in spring and autumn. The above results show that the errors of atmospheric detection are mainly in the lower troposphere and the upper stratosphere, the lower troposphere is mainly affected by water vapor, the upper stratosphere is mainly influenced by the ionosphere, and the ionospheric electron density is high. The inversion accuracy of atmospheric parameters in the upper stratosphere is poor. Through the comparison of different ionospheric correction methods, it is shown that the curved angle ionospheric correction method is superior to the phase correction method, but the atmospheric parameter inversion error increases with the increase of altitude, which indicates that the ionospheric residual error still exists. In order to further correct the ionospheric residual error, compared the occultation data with the MSIS data, the bending angle error obtained shows that the ionospheric residual error is systematic deviation in the upper stratosphere. The ionospheric residual systematic deviation of a single occultation event can be improved by using the mean bending angle error data of one year.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P412.2;P228.4

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