Urban areas are the living place for more than half of mankind. The trend for urbanisation is ongoing. Urban climate is a major factor determining the living conditions in urban areas. The planning of new cities as well as the transformation of existing cities towards more sustainable places to live in thus requires scenario simulations with urban climate models. Urban areas are characterised by a large heterogeneity across a wide range of spatial and temporal scales. Up to now, no numerical model exists which is able to cover all spatial scales from street canyons (i.e., the microscale) to the rural surroundings (i.e., the mesoscale) and all temporal scales from seconds to years. Work has started in the German project ‘Urban Climate Under Change – [UC]²’, funded by the German Federal Ministry of Education and Research (BMBF), aiming at the development, validation and application of an innovative urban climate model for entire cities in 2016. The project [UC]² consists of three parts: (1) a modelling part (MOSAIK) building a chain of models covering the desired scales, (2) an evaluation part (3DO), and (3) a test part reviewing practical and user serviceability of an urban climate model to foster climate proof urban development (KliMoPrax).
The working group "Regional coupling of ecosystem-atmosphere processes" of IMK-IFU is participating in MOSAIK by implementing an air chemistry mechanism into a LES model and in subproject 7 of 3DO by performing measurements in Stuttgart. Measurement are made by ground-based remote sensing devices (ceilometers, wind lidars) in order to scan the vertical structure of the urban boundary layer. The overall measurement plan is depicted in the following graph.
Measurements of IMK-IFU in Stuttgart are marked by a green "7". (c) 2016 Stefan Emeis
There are planned four intensiv observation periods: January/February 2017, July/August 2017, January/February 2018 and July/August 2018.
Contact: Stefan Emeis