本文選題：掩星大氣探測 + 資料質(zhì)量��； 參考：《中國礦業(yè)大學(xué)》2017年碩士論文

【摘要】：掩星大氣探測技術(shù)具有垂直分辨率高,精度高,成本低,全球覆蓋等優(yōu)點,目前已成為一種重要的大氣探測手段。在對中性層大氣參數(shù)的反演中,電離層對反演精度有較大影響,進行有效的電離層修正和電離層殘余誤差的改進具有重要意義。為探究電離層對掩星大氣探測的影響,經(jīng)過和再分析資料和探空資料的對比,在10~30km,COSMIC掩星資料的濕反演溫度平均相對偏差一般在0.5%以內(nèi),折射率平均相對偏差在0.3%以內(nèi),但在低對流層的溫度的相對偏差平均值和標準差較大,在上平流層折射率的相對偏差平均值和標準差較大。赤道附近低緯度區(qū)域掩星資料的質(zhì)量比南北半球高緯度區(qū)域差,同一區(qū)域冬季和夏季的掩星資料質(zhì)量比春季和秋季差。以上結(jié)果表明,大氣探測的誤差主要在低對流層和上平流層,低對流層主要受水汽的影響,上平流層主要受電離層影響,電離層電子密度較大的情況下,上平流層的大氣參數(shù)的反演精度較差。經(jīng)過不同的電離層修正方法的對比,表明彎曲角電離層修正方法要優(yōu)于相位修正方法,但大氣參數(shù)反演誤差隨著高度的增加而增大,表明仍然存在電離層殘余誤差,為進一步修正電離層殘余誤差,將掩星數(shù)據(jù)和MSIS的數(shù)據(jù)進行對比,得到的彎曲角度誤差表明電離層殘余誤差在平流層上部表現(xiàn)為系統(tǒng)性偏差,利用一年的平均彎曲角度誤差數(shù)據(jù)可以對單個掩星事件的電離層殘余系統(tǒng)性偏差進行改進。
[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.
【學(xué)位授予單位】：中國礦業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：P412.2;P228.4

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