From Anatolian Plateau to American Plains: A transcontinental assessment of the EUMETSAT H SAF’s new generation snow water equivalent product over Türkiye and the conterminous U.S.

Yıl 2023, Cilt: 9 Sayı: 2, 33 - 40, 01.01.2024

Semih Kuter , Çağrı Hasan Karaman , Mustafa Berkay Akpınar , Zuhal Akyürek

https://doi.org/10.53516/ajfr.1347158

Öz

The main frame of this paper is to present the first validation results of the new generation hemi-spherical daily snow water equivalent (SWE) product of the EUMETSAT H SAF, namely, H65. It utilizes data from passive microwave radiometry sensors to estimate SWE. Operating at a suitable spatial scale, it offers insights into snow accumulation and melting dynamics, advancing satellite-based snow monitoring across diverse regions. The validation period covers the 2021 snow year, from January to March 2021, during which the dry snow conditions prevail. The validation is conducted in two distinct geographic regions, Türkiye, and the conterminous U.S. For Türkiye, the in-situ snow depth measurements provided by the Turkish State Meteorological Service are employed. On the other hand, the 1-km gridded SWE dataset of NOAA National Ice and Snow Data Center is used in the validation over the U.S. The validation results over Türkiye yields an overall RMSE of 39.27 mm, whereas it reads 15.19 mm for the U.S. These results indicate that the H65 SWE product complies with the product requirement thresholds for both flat (40 mm) and mountainous (45 mm) areas.

Anahtar Kelimeler

Remote sensing of snow, EUMETSAT, H SAF, Snow water equivalent, H65, Passive microwave radiometry

Anadolu Platosundan Amerika Ovalarına: EUMETSAT H SAF'ın yeni nesil kar suyu eşdeğeri ürününün Türkiye ve ABD üzerindeki kıtalararası değerlendirmesi

Öz

Bu makalenin ana çerçevesi, EUMETSAT H SAF'ın yeni nesil yarı küresel günlük kar suyu eşdeğeri (KSE) ürünü olan H65'in ilk doğrulama sonuçlarını sunmaktır. Ürün KSE’yi tahminlemek için pasif mikrodalga radyometri sensörlerinden gelen verileri kullanmaktadır. Uygun bir mekânsal ölçekte çalışan bu ürün, kar birikimi ve erime dinamikleri hakkında içgörüler sunarak çeşitli bölgelerde uydu tabanlı kar izlemeyi geliştirmektedir. Doğrulama dönemi, kuru kar koşullarının hüküm sürdüğü 2021 Ocak ayından Mart 2021'e kadar olan 2021 kar yılını kapsamaktadır. Doğrulama, Türkiye ve ABD olmak üzere iki farklı coğrafi bölgede gerçekleştirilmiştir. Türkiye için Meteoroloji Genel Müdürlüğü tarafından sağlanan yerinde kar derinliği ölçümleri kullanılmıştır. Öte yandan, NOAA Ulusal Buz ve Kar Veri Merkezi'nin 1 km'lik hücreli SWE veri seti ABD üzerindeki doğrulamada kullanılmıştır. Türkiye üzerindeki doğrulama sonuçları 39,27 mm'lik genel bir RMSE verirken, ABD için bu 15,19 mm olmaktadır. Bu sonuçlar, H65 SWE ürününün hem düz (40 mm) hem de dağlık (45 mm) alanlar için ürün gereksinim eşiklerine uyduğunu göstermektedir.

Anahtar Kelimeler

Karın uzaktan algılanması, EUMETSAT, H SAF, Kar suyu eşdeğeri, H65, Pasif mikrodalga radyometrisi

Kaynakça

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