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

Yıl 2024, Cilt: 5 Sayı: 2, 211 - 221, 26.09.2024

Seldanur Çelik Tunçer , Emine Tanır Kayıkçı

https://doi.org/10.48123/rsgis.1489595

Öz

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.

Anahtar Kelimeler

GNSS, Radyo okültasyon, COSMIC-2, Radyosonda

Assessment of Atmospheric Parameters Obtained with FORMOSAT-7/COSMIC-2 GNSS Radio Occultation Technique

Öz

Global Navigation Satellite System - Radio Occultation (GNSS-RO) is a space-based observation technique with significant potential for predicting weather events and monitoring climatic changes. In GNSS-RO technique, radio signals transmitted from high-orbit satellites are measured by receivers placed on low-orbit satellites. The radio signals recorded in GNSS receivers are processed according to atmospheric retrieval processes to obtain profiles such as temperature, pressure, water vapor, and electron density. The GNSS-RO technique can operate in all weather conditions without the need for calibration and provides rich data with high vertical resolution on a global scale. FORMOSAT-7/COSMIC-2 satellites, which can receive signals from satellites such as GPS, Galileo, and GLONASS, can provide over 4000 high-quality RO measurements daily in the ±45° latitude region. Launched into low Earth orbit in 2019, one of the primary goals of this satellite has been to improve GNSS-RO measurement quality in the lower and middle troposphere. In this study, radiosonde profiles were utilized to evaluate and validate atmospheric profiles obtained with FORMOSAT-7/COSMIC-2 RO. The comparison focused on temperature, water vapor pressure, specific humidity, and refraction profiles at altitudes ranging from 5-25 km. The study found a good agreement between RO and radiosonde profiles.

Anahtar Kelimeler

GNSS, Radio occultation, COSMIC-2, Radiosonde

Kaynakça

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