Evaluation of ERA5 Significant Wave Height versus New Multi-Mission Satellite Altimeter Measurements in an Enclosed Basin

Öz

The present study aims to examine the accuracy of significant wave height (Hs) based on the ECMWF (European Center for Medium-Range Weather Forecasts) ERA5. The ERA5 reanalysis datasets are retrieved for the period 2002−2021, having spatial and temporal resolutions of 0.50  0.50 and 1 hour, respectively. The ERA5 Hs datasets are validated versus in-situ measurements. The ERA5 reanalysis datasets are reasonably well matched at four measurement stations, as indicated by a relatively high correlation coefficient (r, Q-Q plot) and low statistical error measures (bias, NBI, SI, and RMSE). The results indicate that the ERA5 datasets perform well in estimating Hs in the Black Sea. The ERA5 Hs is used for the spatial validation of the data from the European Space Agency for Sea State Climate Change Initiative (ESA CCI-SS). The ESA CCI-SS, a new multi-mission satellite altimeter measurement of the Hs datasets, provides the data with a 1.0  1.0 spatial resolution and monthly temporal resolution, spanning from 2002 to 2021. It has been determined that ESA CCI-SS (v3, latest version) datasets from the multi-mission altimeter measurements are in good agreement with the ERA5 reanalysis data over the entire Black Sea. The results of the long-term (20-year average) and monthly averages exhibit that the ESA CCI-SS datasets are a good alternative data source in terms of Hs and can be reliably used for the Hs in the Black Sea wave climate studies.

Anahtar Kelimeler

• Significant wave height
• ERA5 reanalysis data
• Satellite altimeter measurement
• Wave climate
• Black Sea.

Kapalı Bir Havzada Yeni Çok Amaçlı Uydu Altimetre Ölçümlerine Karşı ERA5 Belirgin Dalga Yüksekliğinin Değerlendirmesi

Öz

Bu çalışma, ECMWF (Avrupa Orta Menzilli Hava Tahminleri Merkezi) ERA5 verilerini temel alan belirgin dalga yüksekliğinin (Hs) doğruluğunu değerlendirmeyi amaçlamaktadır. ERA5 yeniden analiz verileri, 2002−2021 dönemi için 0.50  0.50 standart uzamsal çözünürlük ve 1 saat zaman adımı ile indirilmiştir. ERA5 Hs verileri yerinde ölçümlere karşı doğrulanmıştır. ERA5 yeniden analiz verileri nispeten yüksek bir korelasyon katsayısına (r, Q-Q grafiği) ve düşük istatistiksel hata ölçütlerine (bias, NBI, SI ve RMSE) sahip olması nedeniyle tüm ölçüm istasyonlarında makul derecede iyi eşleşmiştir. ERA5 verileri, Karadeniz bölgesi için Hs’in tahmininde iyi bir performans sergilemiştir. ERA5 Hs verileri, Avrupa Uzay Ajansı İklim Değişikliği Girişimi Deniz Durumu (ESA CCI-SS) verilerinin uzamsal doğrulamasında kullanılmıştır. Hs verilerinin yeni çok amaçlı uydu altimetre ölçümü olan ESA CCI-SS, 2002'den 2021'ye kadar uzanan 1.0  1.0 uzamsal çözünürlük ve aylık zamansal çözünürlükte veri sağlamaktadır. Çok amaçlı altimetre ölçümlerinden elde edilen ESA CCI-SS (v3, son sürüm) veri setlerinin tüm Karadeniz çalışma alanı için ERA5 Hs verileri ile oldukça iyi bir uyum içinde olduğu belirlenmiştir. Uzun dönemli (20-yıllık ortalama) ve aylık ortalamaların sonuçları, ESA CCI-SS verilerinin Hs açısından iyi bir alternatif veri kaynağı olduğu ve Karadeniz dalga iklimi çalışmalarında Hs için güvenilir bir şekilde kullanılabileceğini göstermektedir.

Anahtar Kelimeler

• Belirgin dalga yüksekliği
• ERA5 yeniden analiz verileri
• Uydu altimetre verileri
• Dalga iklimi
• Karadeniz.

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