Logo Leibniz Universität Hannover
Logo: Institut für Meteorologie und Klimatologie/Leibniz Universität Hannover
Logo Leibniz Universität Hannover
Logo: Institut für Meteorologie und Klimatologie/Leibniz Universität Hannover
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Model-based city planning and application in climate change (MOSAIK-2)

Leitung:Björn Maronga, Siegfried Raasch, Günter Groß, Matthias Sühring
Bearbeitung:Omar El Guernaoui, Dr. Sebastian Hettrich, Simone Pfau, Tobias Gronemeier, Dr. Ion Matei, Dr. Christopher Mount, Johannes Schwenkel, Dr. Matthias Sühring
Förderung durch:BMBF
Bild Model-based city planning and application in climate change (MOSAIK-2)

The central goal of MOSAIK-2 within the 2nd phase of Urban Climate Under Change ([UC]2) is the further development of PALM-4U as a tool for practical applications by local authorities as well as for scientific
applications. Our goal is to advance the model to a point where it can address a wide variety of present and future questions of socio-economic importance, and to create tools and organizational structures that will guarantee the development and usage of PALM-4U well beyond the funding period, on the national but also international level. Our activities will include further evaluation of model results, optimizations for new computer architectures, as well as development of quality control mechanisms and concepts to incorporate teaching in PALM-4U development and application of the model in the
academic curriculum. In more detail, the project pursues the following goals
● further evaluation based on measurement campaigns conducted in the 1st phase,
and on specific measurements to be carried out during the 2nd phase
● development of new model components to address precipitation: coupling of large-
scale clouds and precipitation from COSMO/ICON/WRF and implementation of ice
phase cloud physics, synthetic precipitation patterns, surface -run off and flooding,
and implementation of frozen water and snowpack in the surface schemes
● improved radiation scheme for building-resolving simulations, allowing for shading
effects of clouds and improved longwave radiative cooling during nighttime
● add model components for noise propagation, photovoltaic solar power plants, and
prediction of wind throw of urban trees in stormy weather
● improve urban chemistry module in terms of biogenic emissions, enhanced aerosol
description including ultra fine particles, pollen emissions and transport, and
advanced emissions, and wet deposition of pollutants
● multi-agent activities (intelligent routing and incorporation of demographic data,
extension to road traffic and emissions)
● coupling of PALM-4U with an advanced traffic flow model to study effects of
immission based traffic flow management
● optimization of new code components, optimization for new processor architectures
(NEC vector boards, new GPU hardware), or for hybrid MPI-OpenMP model
● remove known deficits, e.g. add an immersive boundary layer method to account for
slanted surfaces in a regular grid
● extend the code by the compressible Navier-Stokes equations, to allow scalability of
the code for massively parallel computer architectures with more than 100.000
● develop tools that allows continuous integration of new code and continuous
deployment of the model by model developers, scientists, and expert users. This
might include a graphical user interface that integrates the different tools.
● development of a community model design, and implementation of a respective
PALM-4U governance structure (advisory board, steering committee, scientific work
groups, etc.)
● invitation of leading foreign scientists to promote the international usage of PALM-
4U, support of international groups that start to use PALM-4U

All the goals will contribute to further establish PALM-4U as the worldwide leading urban climate model for
many years to come.