Comparison of New Multi-Mission Satellite Altimeter Wave Height Estimates with Era5 Wave Datasets in the Mediterranean Sea

Abstract

In this study, the new multi-mission satellite altimeter wave height (Hm0) estimates were compared with the latest reanalysis significant wave height (Hm0) data from the European Centre for Medium-Range Weather Forecasts (ECMWF), specifically the ERA5 wave datasets, in the Mediterranean Sea. For this purpose, the ERA5 Hm0 datasets with hourly temporal and 0.5°x0.5° spatial resolutions from the ECMWF and the new multi-mission satellite altimeter wave height estimates with monthly temporal and 1.0°x1.0° spatial resolutions from the European Space Agency for Sea State Climate Change Initiative (ESA CCI-SS) were downloaded for the entire Mediterranean Sea. Analyses were performed for 20 years (20022021) available in both databases. It was found that the ESA CCI-SS Hm0 estimates generally overestimated the wave height compared to the ERA5 datasets, and the discrepancy reached a maximum, especially at the sea-land boundaries. In general, the ESA CCI-SS Hm0 estimates were greater than ERA5 by 0.30 m in the Alboran Sea, 0.67 m in the Algerian Basin, 0.52 m in the Tyrrhenian Sea, 0.54 m in the Ionian Sea, 0.47 m in the Adriatic Sea, 0.47 m in the north of the Aegean Sea and 0.46 m in the Levantine Basin. On the other hand, the ESA CCI-SS underestimated Hm0 along the southern coast of the Mediterranean basin compared to the ERA5 datasets.

Keywords

• Significant wave height
• satellite altimeter data
• Mediterranean wave climate
• ERA5
• ESA CCI-SS

Yeni Çok Amaçlı Uydu Altimetre Dalga Yüksekliği Tahminleriyle ERA5 Dalga Verilerinin Akdeniz Çalışma Alanında Karşılaştırılması

Abstract

Bu çalışmada, yeni çok amaçlı uydu altimetre dalga yüksekliği (Hm0) tahminleri, Avrupa Orta Menzilli Hava Tahminleri Merkezi’nin (ECMWF) en yeni yeniden analiz dalga verileri olan ERA5 belirgin dalga yüksekliği (Hm0) verileriyle, Akdeniz çalışma alanında, karşılaştırılmıştır. Bu amaçla, ECMWF veri tabanından 1 saat zamansal ve 0,5°x0,5° uzamsal çözünürlüklü ERA5 Hm0 verileri ve Avrupa Uzay Ajansı İklim Değişikliği Girişimi Deniz Durumu (ESA CCI-SS) veri tabanından aylık zamansal ve 1,0°x1,0° uzamsal çözünürlüklü yeni çok amaçlı uydu altimetre Hm0 tahminleri Akdeniz çalışma alanı için indirilmiştir. Analizler, her iki veri tabanında da mevcut olan 20022021 yılları kapsayan 20 yıl için gerçekleştirilmiştir. Yeni çok amaçlı uydu altimetre Hm0 tahminlerinin, ERA5 yeniden analiz Hm0 verilerine göre daha büyük tahmin ettiği ve bu farkların özellikle kara-deniz birleşim yerlerinde maksimuma ulaştığı saptanmıştır. Genel olarak, ESA CCI-SS Hm0 tahminleri, ERA5 verilerine göre dalga yüksekliğini; Alboran Denizi’nde 0,30 m, Cezayir Havzası’nda 0,67 m, Tiren Denizi’nde 0,52 m, İyonya Denizi’nde 0,54 m, Adriyatik Denizi’nde 0,47 m, Ege Denizi’nin kuzeyinde 0,47 m ve Levantin Havzası’nda 0,46 m daha büyük tahmin etmiştir. Diğer taraftan Akdeniz havzasının güney kıyı bölgelerinde ESA CCI-SS tahminlerinin, ERA5 verilerine kıyasla daha küçük Hm0 önerdiği belirlenmiştir.

Keywords

• Belirgin dalga yüksekliği
• uydu altimetre dalga yüksekliği tahminleri
• Akdeniz dalga iklimi
• ERA5
• ESA CCI-SS

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