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Measurements and Modelling of Offshore Wind Profiles in a Semi-Enclosed Sea

Department of Earth Sciences, Uppsala University, SE-75236 Uppsala, Sweden
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Current address: Department of Earth Sciences, Uppsala University, SE-75236 Villavägen 16, Sweden.
Atmosphere 2019, 10(4), 194; https://doi.org/10.3390/atmos10040194
Received: 4 March 2019 / Revised: 29 March 2019 / Accepted: 5 April 2019 / Published: 10 April 2019
(This article belongs to the Special Issue Vertical Structure of the Atmospheric Boundary Layer in Coastal Zone)
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Abstract

A conically scanning, continuous-wave LIDAR is placed on an island in the central Baltic Sea with large open-water fetch, providing wind and turbulence profiles up to 300 m height. LIDAR and Weather Research and Forecasting (WRF) profiles from one year are used to characterize the marine boundary layer, at the same time performing an evaluation of the WRF model against LIDAR measurements with a focus on low-level jet representation. A good agreement is found between the average wind speed profile in WRF and LIDAR, with the largest bias occurring during stable conditions. The LLJ frequency is highest in May with frequency of occurrence ranging between 18% and 27% depending on the method of detection. Most of the LLJs occur during nighttime, indicating that most of them do not have local origin. For cases with simultaneous LLJs in both data sets the WRF agrees well with the LIDAR. In many cases, however, the LLJ is misplaced in time or space in the WRF simulations compared to the LIDAR. This shows that models still must be improved to capture mesoscale effects in the coastal zone. View Full-Text
Keywords: LIDAR; WRF; coastal meteorology; low-level jet LIDAR; WRF; coastal meteorology; low-level jet
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Svensson, N.; Arnqvist, J.; Bergström, H.; Rutgersson, A.; Sahlée, E. Measurements and Modelling of Offshore Wind Profiles in a Semi-Enclosed Sea. Atmosphere 2019, 10, 194.

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