Measuring meteorology in urban areas – some progress and many problems Ekaterina Batchvarova 1, Sven-Erik Gryning 2 National Institute of Meteorology and.

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Presentation transcript:

Measuring meteorology in urban areas – some progress and many problems Ekaterina Batchvarova 1, Sven-Erik Gryning 2 National Institute of Meteorology and Hydrology, Sofia, Bulgaria; Risø DTU, Roskilde, Denmark Presented by Sue Grimmond as a contribution from COST728

The cup anemometer is still the reference instrument for wind speed at a given point

BUBBLE experiment (Basel-2002) and for point fluxes the sonic anemometer dominates

Schematics of the boundary layer structure over an urban area but the structure of the turbulence is very complicated what are point measurements good for?

From Feddersen 2005 (PhD thesis ) ETH Zürich wind tunnel simulation of BUBBLE

Mixed layer development – 3, aggregated fluxes During 5 days with sunshine 7 successive high-resolution radiosoundings were performed starting at 7 a.m. and ending at 7 p.m. Local Summer Time

Map of Sofia and close rural areas (56 by 28 km approximatelySofia

Aggregated vs measured kinematic heat flux

Use of LIDAR looks promissing (focussed and pulssed)

Wind direction and speed over a forest, measured by LIDAR

Horizontal wind profile (half hour averaged) over a forest at 40 meters we should do this for an urban area

Outside Namibia (upwelling)

and the indispensable radiosonde

Outside Namibia where we found the waves in the atmosphere

Some conclusions Lidar is a promising tool for urban meteorological measurements and should be used to measure the horizontal variation of the of the wind field and maybe even the turbulence field in addition to the vertical profile. Can a ceilometer be used to measure the height of the boundary layer in an urban settelment? It proved to be very successful over the sea. Radiosoundings are always good. The boundary layer is the turbulent layer adjacent to he ground, it should not be confused (mixed-up) with an non-turbulent residual layer. Instruments based on backscatter from particles cannot distinguish between the two layers. Maybe we can see the turbulence and in this way distingush between the two layers, if we measure the variance of the particle concentration?

Acknowledgements The study was supported by the Danish Energy Research Programme (EFP / ), NATO (ESP.EAP.EV ) and is related to activities of the authors within COST728, COST732 and COST735.