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Turbulent kinetic energy over large offshore wind farms observed and simulated by the mesoscale model WRF (3.8.1) by 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 is a Earth and Planetary Sciences article available to read on EtoBox.

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Abstract. 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 red

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Author

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

Publisher

Copernicus GmbH; Göttingen: Copernicus Publ.; Copernicus Gesellschaft mbH (ISSN 1991-9603)

Published

2020

Language

EN

Field

Earth and Planetary Sciences (Physical Sciences)