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Long-term simulation of the boundary layer flow over the double-ridge site during the Perdigão 2017 field campaign

Wagner, Johannes and Gerz, Thomas and Wildmann, Norman and Gramitzky, Kira (2019) Long-term simulation of the boundary layer flow over the double-ridge site during the Perdigão 2017 field campaign. Atmospheric Chemistry and Physics (19), pp. 1129-1146. Copernicus Publications. DOI: 10.5194/acp-19-1129-2019 ISSN 1680-7316

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Official URL: https://doi.org/10.5194/acp-19-1129-2019

Abstract

The Perdigao campaign 2017 was an international field campaign to measure the flow and its diurnal variation in the atmospheric boundary layer over complex terrain. A huge dataset of meteorological observations was collected over the double-hill site by means of state-of-the-art meteorological measurement techniques. A focus of the campaign was the interaction of the boundary layer flow with a single wind turbine, which was located on the south-western (SW) ridge top. In this study a long-term nested large-eddy-simulation (LES) of 49 days duration with a maximum horizontal resolution of 200m is used to describe both the general meteorological situation over Spain and Portugal and the local small-scale flow structures over the double-hill during the intensive observation period (IOP). The simulations show that frequently observed nocturnal low-level jets (LLJ) from NE have their origin over the slopes of the elevated plateau between the Portuguese Serra da Estrela and the Spanish Sierra de Gata mountain ranges N and NE of Perdigao and that the diurnal clockwise turning of the wind direction over the double-ridge is induced by slope- and valley-winds under weak synoptic conditions. It is found that in spite of the long simulation time, modelled and observed wind structures on the ridge tops agree well, while along-valley flow within the valley is underestimated by the model.

Item URL in elib:https://elib.dlr.de/123271/
Document Type:Article
Title:Long-term simulation of the boundary layer flow over the double-ridge site during the Perdigão 2017 field campaign
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Wagner, JohannesDLR, IPAUNSPECIFIED
Gerz, ThomasDLR, IPAUNSPECIFIED
Wildmann, NormanDLR, IPAUNSPECIFIED
Gramitzky, KiraDLR, IPAUNSPECIFIED
Date:2019
Journal or Publication Title:Atmospheric Chemistry and Physics
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI :10.5194/acp-19-1129-2019
Page Range:pp. 1129-1146
Editors:
EditorsEmail
Palma, Jose LaginhaUNSPECIFIED
Publisher:Copernicus Publications
ISSN:1680-7316
Status:Published
Keywords:Boundary layer flow, complex terrain, numerical modelling
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Erdbeobachtung
DLR - Research theme (Project):R - Vorhaben Atmosphären- und Klimaforschung
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Transport Meteorology
Deposited By: Wagner, Johannes
Deposited On:19 Nov 2018 09:37
Last Modified:02 May 2019 14:05

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