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Turbulent kinetic energy over large offshore wind farms observed and simulated by the mesoscale model WRF (3.8.1)

Siedersleben, Simon K.; Platis, Andreas; Lundquist, Julie K.; Djath, Bughsin; Lampert, Astrid; Bärfuss, Konrad; Cañadillas, Beatriz; Schulz-Stellenfleth, Johannes; Bange, Jens; Neumann, Tom; Emeis, Stefan

Abstract (englisch):
Wind farms affect local weather and microclimates; hence, parameterizations of their effects have been developed for numerical weather prediction models. While most wind farm parameterizations (WFPs) include drag effects of wind farms, models differ on whether or not an additional turbulent kinetic energy (TKE) source should be included in these parameterizations to simulate the impact of
wind farms on the boundary layer. Therefore, we use aircraft measurements above large offshore wind farms in stable conditions to evaluate WFP choices. Of the three case studies we examine, we find the simulated ambient background flow to agree with observations of temperature stratification and winds. This agreement allows us to explore the sensitivity of simulated wind farm effects with respect to modeling choices such as whether or not to include a TKE source, horizontal
resolution, vertical resolution and advection of TKE. For a stably stratified marine atmospheric boundary layer (MABL), a TKE source and a horizontal resolution on the order of 5 km or finer are necessary to represent the impact of offshore wind farms on the MABL. Additionally, TKE advection results in excessively reduced TKE over the wind farms, which in turn causes an underestimation of the wind speed deficit above the wind farm. ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000118769
Veröffentlicht am 28.04.2020
Originalveröffentlichung
DOI: 10.5194/gmd-13-249-2020
Scopus
Zitationen: 1
Web of Science
Zitationen: 1
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung - Atmosphärische Umweltforschung (IMK-IFU)
Publikationstyp Zeitschriftenaufsatz
Publikationsdatum 29.01.2020
Sprache Englisch
Identifikator ISSN: 1991-9603
KITopen-ID: 1000118769
HGF-Programm 12.02.04 (POF III, LK 01)
Urban-Rural Interactions
Erschienen in Geoscientific model development
Band 13
Heft 1
Seiten 249–268
Projektinformation WIPAFF; TP (BMWi, 0325783A)
Schlagwörter wind energy, turbulent kinetic energy
Nachgewiesen in Web of Science
Scopus
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