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Analysis of the differences between GPS radio occultation and radiosonde atmosphere profiles in Egypt
The Egyptian Journal of Remote Sensing and Space Sciences ( IF 6.393 ) Pub Date : 2022-03-03 , DOI: 10.1016/j.ejrs.2022.02.006
Ibrahim Fouad Ahmed 1 , Mohamed Amin Abd El-Fatah 1 , Ashraf El-Kutb Mousa 2 , Gamal El-Fiky 1
Affiliation  

Difference values between Global Positioning System (GPS)-Radio Occultation (RO) and radiosonde (RS) profiles are analyzed to assess the integration applicability between them in Egypt. Compared profiles which have altitudes ranged from 3 to 25 km are used in analysis for ten years of RO and RS data. According to single profile comparison and t test, all difference values are not significant except for Water Vapor Pressure (WVP). Pressure, temperature, WVP and refractivity mean difference values are 0.6 mb, 0.79 deg, 0.1 mb, 0.48 with relative error of 0.3%, 1.7%, 62% and 0.7%, respectively however, refractivity values are significantly affected by small difference in the other parameters. According to Low Earth Orbiter (LEO) satellites difference analysis, GRACE2 gave maximum difference values of 4.3 ± 0.15 mb in pressure and 7.8 ± 0.35 deg in temperature with a relative error of 1.96% and 16.26% for them, respectively. COSMIC 3 & 6 and GRACE1 gave minimum difference values and the other missions gave small difference values but all of these differences are considered statistically significant. According to upper air stations difference analysis, station Benina gave big difference values of 5.1 ± 0.23 mb in pressure and 6 ± 0.3 deg in temperature with a relative error of 2.3% and 12.58% for them, respectively. Stations Mersa Matruh, Athalasa and South of Valley gave a smaller difference values and the other stations gave small difference values. However, all of stations differences are statistically significant.



中文翻译:

埃及GPS无线电掩星与无线电探空仪大气廓线差异分析

分析全球定位系统(GPS)-无线电掩星(RO)和无线电探空仪(RS)剖面之间的差异值,以评估它们在埃及的集成适用性。具有高度范围从 3 到 25 公里的比较剖面用于分析十年的 RO 和 RS 数据。根据单轮廓比较和t测试中,除水蒸气压 (WVP) 外,所有差异值均不显着。压力、温度、WVP 和折射率的平均差值分别为 0.6 mb、0.79 度、0.1 mb、0.48,相对误差分别为 0.3%、1.7%、62% 和 0.7%,然而,折射率值受到显着差异的显着影响其他参数。根据近地轨道(LEO)卫星差异分析,GRACE2 给出的最大压力差值为 4.3 ± 0.15 mb,温度为 7.8 ± 0.35 度,相对误差分别为 1.96% 和 16.26%。COSMIC 3 & 6 和 GRACE1 给出了最小的差异值,而其他任务给出了小的差异值,但所有这些差异都被认为具有统计学意义。根据高空站差异分析,Benina 站给出了 5.1 ± 0.23 mb 的压力和 6 ± 0.3 度的温度差异值,它们的相对误差分别为 2.3% 和 12.58%。Mersa Matruh、Athalasa 和 South of Valley 站的差值较小,其他站的差值较小。然而,所有站的差异在统计上都是显着的。

更新日期:2022-03-03
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