Environmental Engineering Reference
In-Depth Information
The representativeness is a function of the length scale of turbulence
(height in the surface layer) and averaging time of the measurements (as a
first rough approximation).
A good model performance does not require exact match with data.
In other words a model cannot be improved if the measurements fall within
the statistical range defined by the representativeness.
Acknowledgments The data from Lindenberg are provided through the CEOP/GEWEX
BALTEX (Baltic Sea Experiment) database and it is a pleasure to acknowledge the Deutscher
Wetterdienst (DWD) - Meteorologisches Observatorium Lindenberg/Richard Assmann
Observatorium who originally provided the measurements for the data base. The work is part of
collaboration within COST 728 - V. Mathias and M. Quante from GKSS (Germany) and R. San
Jose from UPM (Spain) are acknowledged for model results. The study is supported by the
Danish Council for Strategic Research, Sagsnr 2104-08-0025 and the EU FP7 Marie Curie
Fellowship VSABLA.
References
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Science Foundation, Brussels, 2005) p. 85-93.
Gryning S.-E. and Batchvarova E. 2009 Measuring Meteorology in Urban Areas - Some
progress and many problems In proceedings: Meteorological and Air Quality Models for
Urban Areas. Exeter (UK) May 3-4 2007. Baklanov, A., Grimmond, S,, Mahura, A. and
Athanassiadou M., Springer, Dordrecht, Heidelberg, London, New York.
Sreenivasan K.R., Chambers A.J. and R.A. Antonia, 1978: Accuracy of moments of velocity and
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Stern R., Builtjes P., Schaap M., Timmermans R., Vautard R., Hodzic A., Memmesheimer M.,
Feldmann H., Renner E., Wolke, R., Kerschbaumer A. 2008. A model inter-comparison study
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Tennekes H. and Lumley J.L. 1972. A first course in turbulence. MIT Press, Cambridge, Mass.
300 pp.
5. Question and Answers
Kurt Fedra: Does anybody use vertical data from airplanes start/landings.
Answer: Yes, but such data represent instantaneous slanted vertical profiles and
are therefore not suitable for this type of data analysis.
Christian Reuten: The error bars on the model results cannot be representative of
the uncertainty of the model output. If they were, there would be more
variability in model results from hour to hour.
Answer: The mean curve is the ensemble average and the error bars are not the
uncertainties of the model results but those of the observations.
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