The Federal Ministry of Education and Research (BMBF) is funding a second phase of the research programme 'Urban Climate Under Change' [UC]2 (http://uc2-program.org/en), which started on 1st October 2019 and will last three years. The research programme is part of the Research for Sustainable Development (FONA; https://www.fona.de/en) and is managed by the German Aerospace Center (DLR).

The programme consists of three modules: Module A (further development of PALM-4U), Module B (evaluation and scientific application of PALM-4U) and Module C (operationalisation of PALM-4U). The coordinator of Module B (Prof. Dr. Dieter Scherer, TU Berlin) is also the coordinator of the program.

In the next three years of [UC]2 the urban climate model PALM-4U is to be further developed into a product that not only meets the needs of local authorities and other practical users but can also be used for scientific research.

The joint project "Three-dimensional observation and modelling of atmospheric processes in cities" (3DO+M) is a follow-up initiative of the joint project "Three-dimensional observation of atmospheric processes in cities" (3DO)". 3DO+M will continue the research and development tasks of Module B. The new model name 3DO+M indicates, that Module B partners are focusing on sustainable research and development by continuing the evaluation of PALM-4U with three-dimensional atmospheric observational data while carrying out new, innovative and integrative model-based scientific studies.

In order to achieve the complex objectives of Module B and the entire [UC]2 program, the specific expertise of all partners of the 12 sub-projects of 3DO+M is required, as they cover all relevant topics and methods and are located in the cities to be investigated.