Analysis of the differences between GPS radio occultation and radiosonde atmosphere profiles in Egypt

Ahmed, I.; El-Fatah, Mohamed Amin Abd; Mousa, Ashraf; El-Fiky, Gamal

doi:10.1016/j.ejrs.2022.02.006

Cited by 3 publications

(4 citation statements)

References 11 publications

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“…The WVP content showed minimal differences (0.00 mb), while the refractivity exhibited a slight increase of 0.01 in PlanetiQ. However, the present findings should be considered in light of the single-profile comparison results presented by [15], which highlighted differences in relative errors between datasets. While our study revealed subtle distinctions in atmospheric conditions, Ref.…”

Section: Planetiq-cosmic Profiles Comparison 421 Single Profile Compa...mentioning

confidence: 48%

“…While our study revealed subtle distinctions in atmospheric conditions, Ref. [15] found mean absolute differences for pressure, temperature, WVP, and refractivity and calculated relative errors as percentages. Notably, their analysis indicated that the difference percentage for WVP was 62%, suggesting significant variations in humidity profiles between datasets.…”

Section: Planetiq-cosmic Profiles Comparison 421 Single Profile Compa...mentioning

confidence: 49%

“…Furthermore, studies have elucidated differences between GPS RO and radiosonde atmosphere profiles, providing valuable insights into atmospheric variabilities. Particularly, research in regions like Egypt, led by [15], contributes to our understanding of atmospheric dynamics in specific geographical contexts. These comparative analyses collectively contribute to advancing our comprehension of atmospheric phenomena and optimizing the utilization of GNSS-RO data in various scientific applications.…”

Section: Literature Reviewmentioning

confidence: 99%

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PlanetiQ Radio Occultation: Preliminary Comparative Analysis of Neutral Profiles vs. COSMIC and NWP Models

Ahmed,

Alheyf,

Yamany

2024

Applied Sciences

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Radio Occultation (RO) is pivotal for profiling the neutral and ionized atmosphere, with the PlanetiQ mission, via its GNOMES satellites, striving to establish an advanced atmospheric observing system. However, an assessment of the spatiotemporal distributions of PlanetiQ observations and comparisons with reliable datasets are lacking. This study addresses this gap by examining the temporal and spatial distribution of RO observations from PlanetiQ during its initial 198 operational days in 2023, alongside comparisons with COSMIC and Numerical Weather Prediction (NWP) models. Data from GN02, GN03, and GN04 satellites, yielding 1099, 1313, and 1843 RO events per day, respectively, were analyzed. The satellite constellation’s observations demonstrate a generally well-distributed pattern, albeit minor deficiencies in equatorial and polar regions. Single-profile comparisons with COSMIC data reveal strong correlations for pressure, temperature, Water Vapor Pressure (WVP), and refractivity profiles, with temperature exhibiting larger variations (RMSE = 1.24 °C). Statistical analyses confirm statistically insignificant differences between the PlanetiQ and COSMIC profiles at the same spatio-temporal coordinates. Comparisons with NWP models show slight differences with GFS, with overall RMSE values of 0.23 mb (WVP), 0.6 mb (pressure), 1.3 (refractivity), and 1.5 °C (temperature). However, assessments against GFS/ECMWF models indicate overall compatibility, with insignificant differences between PlanetiQ profiles and model observations.

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Section: Planetiq-cosmic Profiles Comparison 421 Single Profile Compa...mentioning

confidence: 48%

Section: Planetiq-cosmic Profiles Comparison 421 Single Profile Compa...mentioning

confidence: 49%

Section: Literature Reviewmentioning

confidence: 99%

See 1 more Smart Citation

PlanetiQ Radio Occultation: Preliminary Comparative Analysis of Neutral Profiles vs. COSMIC and NWP Models

Ahmed,

Alheyf,

Yamany

2024

Applied Sciences

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“…Furthermore, studies have elucidated differences between GPS RO and radiosonde atmosphere profiles, providing valuable insights into atmospheric variabilities. Particularly, research in regions like Egypt, led by [7], contributes to our understanding of the atmospheric dynamics in specific geographical contexts. These comparative analyses collectively contribute to advancing our comprehension of atmospheric phenomena and optimizing the utilization of GNSS-RO data in various scientific applications.…”

Section: Literature Reviewmentioning

confidence: 99%

PlanetiQ Radio Occultation: Preliminary Comparative Analysis of Neutral Profiles vs. COSMIC and NWP Models

Ahmed,

Alheyf,

Yamany

2024

Preprint

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Radio Occultation (RO) is pivotal for profiling the neutral and ionized atmosphere, with the PlanetiQ mission, via its GNOMES satellites, striving to establish an advanced atmospheric observing system. However, an assessment of the spatiotemporal distributions of PlanetiQ observations and comparisons with reliable datasets are lacking. This study addresses this gap by examining the temporal and spatial distribution of RO observations from PlanetiQ during its initial 198 operational days in 2023, alongside comparisons with COSMIC and Numerical Weather Prediction (NWP) models. Data from GN02, GN03, and GN04 satellites, yielding 1099, 1313, and 1843 RO events per day respectively, were analyzed. The satellite constellation's observations demonstrate a generally well-distributed pattern, albeit minor deficiencies in equatorial and polar regions. Single-profile comparisons with COSMIC data reveal strong correlations for pressure, temperature, Water Vapor Pressure (WVP), and refractivity profiles, with temperature exhibiting larger variations (RMSE = 1.24°C). Statistical analyses confirm statistically insignificant differences between PlanetiQ and COSMIC profiles at the same spatio-temporal coordinates. Comparisons with NWP models show slight differences with GFS, with overall RMSE values of 0.23 mb (WVP), 0.6 mb (pressure), 1.3 (refractivity), and 1.5°C (temperature). However, assessments against GFS/ECMWF models indicate overall compatibility, with insignificant differences between PlanetiQ profiles and models observations.

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FORMOSAT-7/COSMIC-2 GNSS Radyo Okültasyon Tekniği İle Elde Edilen Atmosferik Parametrelerinin Değerlendirilmesi

Çelik Tunçer,

Tanır Kayıkçı

2024

Turk J Remote Sens GIS

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Küresel Navigasyon Uydu Sistemi - Radyo Okültasyon (GNSS-RO), hava olaylarının tahmin edilmesi ve iklimsel değişimlerin izlenmesi için önemli potansiyele sahip uzay tabanlı bir gözlem tekniğidir. GNSS-RO tekniğinde, yüksek yörüngedeki uydulardan iletilen radyo sinyaller, alçak yörüngedeki uydulara yerleştirilmiş alıcılar tarafından ölçülür. GNSS alıcılarında kaydedilen radyo sinyaller, atmosferik geri kazanım süreçlerine göre işlenerek sıcaklık, basınç, su buharı ve elektron yoğunluğu gibi profiller elde edilir. GNSS-RO tekniği, kalibrasyon gereksinimi olmadan her türlü hava koşulunda çalışabilir. Ayrıca, küresel kapsama alanında yüksek dikey çözünürlükte zengin veriler sağlar. GPS, Galileo ve GLONASS gibi uydulardan sinyal alabilen FORMOSAT-7/COSMIC-2 uyduları, 〖±45〗^° enlem bölgesinde günlük 4000'den fazla yüksek kaliteli RO ölçümü sağlayabilir. 2019 yılında alçak yörüngeye başarıyla fırlatılan bu uydunun ana hedeflerinden biri, alt ve orta troposferde GNSS-RO ölçüm kalitesini artırmak olmuştur. Bu çalışmada, FORMOSAT-7/COSMIC-2 RO ile elde edilen atmosferik profilleri değerlendirmek ve doğrulamak için radyosonda profillerinden yararlanılmıştır. Karşılaştırmada, 5-25 km arasında değişen irtifalardaki sıcaklık, su buharı basıncı, özgül nem ve kırınım profilleri esas alınmıştır. Çalışma sonucunda, RO ve radyosonda profilleri arasında iyi bir uyum gözlenmiştir.

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Analysis of the differences between GPS radio occultation and radiosonde atmosphere profiles in Egypt

Cited by 3 publications

References 11 publications

PlanetiQ Radio Occultation: Preliminary Comparative Analysis of Neutral Profiles vs. COSMIC and NWP Models

PlanetiQ Radio Occultation: Preliminary Comparative Analysis of Neutral Profiles vs. COSMIC and NWP Models

PlanetiQ Radio Occultation: Preliminary Comparative Analysis of Neutral Profiles vs. COSMIC and NWP Models

FORMOSAT-7/COSMIC-2 GNSS Radyo Okültasyon Tekniği İle Elde Edilen Atmosferik Parametrelerinin Değerlendirilmesi

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