GNSS meteorology in Egypt: Modeling weighted mean temperature from radiosonde data

This study uses 3600 radiosonde profiles obtained by experimentation from four stations situated in Egypt within 2015–2016 period and Bevis linear regression method was applied to develop a new water vapor weighted temperature (Tm).Bevis, Schueler, Yao, Liou, Suresh Raju and Wayan models performance...

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Main Authors: Nesreen M. Elhaty, Mohamed A. Abdelfatah, Ashraf E. Mousa, Gamal S. El-Fiky
Format: Article
Language:English
Published: Elsevier 2019-06-01
Series:Alexandria Engineering Journal
Online Access:http://www.sciencedirect.com/science/article/pii/S1110016819300262
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spelling doaj-100dca5d8ba44690a38cddbd797f01bc2021-06-02T11:49:57ZengElsevierAlexandria Engineering Journal1110-01682019-06-01582443450GNSS meteorology in Egypt: Modeling weighted mean temperature from radiosonde dataNesreen M. Elhaty0Mohamed A. Abdelfatah1Ashraf E. Mousa2Gamal S. El-Fiky3Construction Department & Utilities, Faculty of Engineering, Zagazig University, EgyptConstruction Department & Utilities, Faculty of Engineering, Zagazig University, EgyptNational Research Institute of Astronomy & Geophysics, Helwan, EgyptConstruction Department & Utilities, Faculty of Engineering, Zagazig University, Egypt; Belbeis Higher Institute of Engineering, EgyptThis study uses 3600 radiosonde profiles obtained by experimentation from four stations situated in Egypt within 2015–2016 period and Bevis linear regression method was applied to develop a new water vapor weighted temperature (Tm).Bevis, Schueler, Yao, Liou, Suresh Raju and Wayan models performances are assessed using the Tm estimated in this study. The biases of these six models were found to be 4.64 k, 10.12 k, 4.46 k, 4.64 k, 4.14 k and 11.53 k, respectively. Three others radiosonde stations data were used to test the estimated Tm and the above six Tm models, one inside Egypt and two from surrounding areas. The six models are outperformed by the estimated Tm by a root-mean square error of 3.95 k. Therefore Egypt Tm new model’s performance is slightly improved compared to the latter models within RMS of 4.49 k. A final case to develop Tm, Tm model is dividing into groups according to the surface temperature (TS) to improved RMS up to 3.1 K. Last but not least the developed Tm model will be of certain practical value in high-precision Precipitable Water Vapor (PWV) calculation in Egypt. Keywords: Weighted mean temperature (Tm), Radiosonde data, Precipitable water (PW)http://www.sciencedirect.com/science/article/pii/S1110016819300262
collection DOAJ
language English
format Article
sources DOAJ
author Nesreen M. Elhaty
Mohamed A. Abdelfatah
Ashraf E. Mousa
Gamal S. El-Fiky
spellingShingle Nesreen M. Elhaty
Mohamed A. Abdelfatah
Ashraf E. Mousa
Gamal S. El-Fiky
GNSS meteorology in Egypt: Modeling weighted mean temperature from radiosonde data
Alexandria Engineering Journal
author_facet Nesreen M. Elhaty
Mohamed A. Abdelfatah
Ashraf E. Mousa
Gamal S. El-Fiky
author_sort Nesreen M. Elhaty
title GNSS meteorology in Egypt: Modeling weighted mean temperature from radiosonde data
title_short GNSS meteorology in Egypt: Modeling weighted mean temperature from radiosonde data
title_full GNSS meteorology in Egypt: Modeling weighted mean temperature from radiosonde data
title_fullStr GNSS meteorology in Egypt: Modeling weighted mean temperature from radiosonde data
title_full_unstemmed GNSS meteorology in Egypt: Modeling weighted mean temperature from radiosonde data
title_sort gnss meteorology in egypt: modeling weighted mean temperature from radiosonde data
publisher Elsevier
series Alexandria Engineering Journal
issn 1110-0168
publishDate 2019-06-01
description This study uses 3600 radiosonde profiles obtained by experimentation from four stations situated in Egypt within 2015–2016 period and Bevis linear regression method was applied to develop a new water vapor weighted temperature (Tm).Bevis, Schueler, Yao, Liou, Suresh Raju and Wayan models performances are assessed using the Tm estimated in this study. The biases of these six models were found to be 4.64 k, 10.12 k, 4.46 k, 4.64 k, 4.14 k and 11.53 k, respectively. Three others radiosonde stations data were used to test the estimated Tm and the above six Tm models, one inside Egypt and two from surrounding areas. The six models are outperformed by the estimated Tm by a root-mean square error of 3.95 k. Therefore Egypt Tm new model’s performance is slightly improved compared to the latter models within RMS of 4.49 k. A final case to develop Tm, Tm model is dividing into groups according to the surface temperature (TS) to improved RMS up to 3.1 K. Last but not least the developed Tm model will be of certain practical value in high-precision Precipitable Water Vapor (PWV) calculation in Egypt. Keywords: Weighted mean temperature (Tm), Radiosonde data, Precipitable water (PW)
url http://www.sciencedirect.com/science/article/pii/S1110016819300262
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AT ashrafemousa gnssmeteorologyinegyptmodelingweightedmeantemperaturefromradiosondedata
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