Boundary Layer, Urban Meteorology and Land-Surface Processes

Validation of the mesoscale transport and fluid model METRAS for Berlin based on a measurement campaign in summer 2012

Kerstin Schaefer
Freie Universitaet Berlin

04 April 2014, 2:00 PM

National Weather Center, Room 5600
120 David L. Boren Blvd.
University of Oklahoma
Norman, OK

The world's population and especially the population in urban areas will increase over the next decades. In addition, the living conditions will change due to climate change. As cities develop their own special climate, it is important to analyze the impact of climate change on cities. Different climate models have been developed. These models have to be validated with measured data. In this work the mesoscale transport and fluid METRAS from the University of Hamburg is analysed for Berlin. In 2012, six measuring campaigns were started within the framework of MILIEU – Centre for Urban Earth System Studies. The students measured the temperature and the relative humidity at 2m and 5cm height above ground. These data and data from permanent measurement stations in Berlin are used for the validation of METRAS. The Deutscher Wetterdienst, the company Meteomedia, the Freie Universitaet Berlin, the Technische Universitaet Berlin and the Hochschule fuer Technik und Wirtschaft provided the data. The evaluation of the measurement campaign revealed that the students measured predominately higher temperature and lower relative humidity. Reasons are the type of instruments used and the fact that the students measured mainly over asphalt. Additionally, Tempelhof Airport could be shown as an example, where the temperature difference between 2m and 12m is low. The temperature fluctuations at 12m were smaller than at 2m. This aspect is important for the analysis, because only 10m temperature and surface temperature were available from the model METRAS. Compared to the measurements, METRAS predicts higher daily precipitation rates. This can be explained by two factors: (i) by the precipitation scheme used in METRAS and (ii) by the fact that simulated soil moisture was higher than the observations.

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