Subproject 11

Measuring and evaluating thermally driven winds and their impact on ventilation and thermal hot spots in cities

Subproject 11 (TP 11) will develop a concept for evaluating the capability of urban climate models to simulate thermally driven winds and their impact on the spatial air temperature distribution and the occurrence of hot spots in a city. Long-term observations (LTO) and intense observation periods (IOP) will be conducted for model evaluation in urban areas where climate is strongly influenced by thermally driven winds. The measurement data will be used to test the concept for a simulation with the urban climate model MUKLIMO_3 of the German Meteorological Service and to validate the capability of the urban climate model to simulate the characteristics and thermal impacts of thermally driven winds in a city with predefined accuracy.

Together with other Module B contributors a joint field study in Stuttgart will be designed and conducted. TP 11 will contribute horizontal and vertical meteorological profile measurements. The measurement and model evaluation concept will focus on heat and air mass exchange caused by local wind systems and on the interaction of urban heat islands with cold-air lakes forming in valleys during nighttime. In Berlin TP 11 aims at measurement activities to study transfer of cool air from a park into an urban quarter.

All field data will be available for other TPs of Module B. TP 11 will contribute to model evaluation in cooperation with Module A, and to tests of model applicability in cooperation with Module C.