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Coastal horizontal wind speed gradients in the North Sea based on observations and ERA5 reanalysis data

Cañadillas, Beatriz; Wang, Shuhan; Ahlert, Yasmin; Djath, Bughsin'; Barekzai, Mares 1; Foreman, Richard; Lampert, Astrid
1 Karlsruher Institut für Technologie (KIT)


The transition from land to sea affects the wind field in coastal regions. From the perspective of near-coastal offshore wind farms, the coastal transition complicates the task of energy resource assessment by, for example, introducing non-homogeneity into the free wind field. To help elucidate the matter, we quantify the average horizontal wind speed gradients at progressively increasing distances from the German coast using two years of hourly ERA5 reanalysis data, and further describe the dependence of wind speed gradients on the measurement height, atmospheric stability, and season. A vertical wind lidar located on Norderney Island near the German mainland acts as our observational reference for the ERA5 data, where a good agreement ( R 2 = 0 . 9 3 $R^2 =\nobreak 0.93$ ) is found despite the relatively coarse ERA5 data resolution. Interestingly, the comparison of lidar data with the higher-resolution Weather Research and Forecasting (WRF) mesoscale model yields good but relatively weaker agreement ( R 2 = 0 . 8 5 $R^2 =\nobreak 0.85$ ). The ERA5 data reveal that, for flow over the North Sea originating from the German mainland from the south, the wind speed at 10 m (110 m) above sea level increases by 30 % (20 %) some 80 km from the coast on average, and by 5 % at larger heights. ... mehr

Verlagsausgabe §
DOI: 10.5445/IR/1000156384
Veröffentlicht am 08.08.2023
DOI: 10.1127/metz/2022/1166
Zitationen: 2
Zitationen: 3
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung – Atmosphärische Umweltforschung (IMK-IFU)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2023
Sprache Englisch
Identifikator ISSN: 0941-2948
KITopen-ID: 1000156384
HGF-Programm 12.11.21 (POF IV, LK 01) Natural ecosystems as sources and sinks of GHGs
Erschienen in Meteorologische Zeitschrift
Verlag Borntraeger Science Publishers
Band 32
Heft 3
Seiten 207-228
Vorab online veröffentlicht am 26.01.2023
Schlagwörter coastal wind speed gradients; ERA reanalysis; offshore; wind energy
Nachgewiesen in Dimensions
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