 |
| Titel |
Implementation, modification and testing of the Building Energy Parameterization Scheme (BEP) in the Climate Local Model |
| VerfasserIn |
Sebastian Schubert, Susanne Grossman-Clarke, Alberto Martilli |
| Konferenz |
EGU General Assembly 2011
|
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 13 (2011) |
| Datensatznummer |
250048028
|
|
|
|
|
|
| Zusammenfassung |
| The Building Energy Parameterization scheme (BEP) was implemented in the mesoscale
Climate Local Model (CLM) in order to improve model performance in weather and climate
simulations for urban areas. Furthermore, modifications were introduced in BEP’s radiation
scheme: (1) closure of the radiative energy balance and (2) the radiative interactions of roofs
with other urban canyon surface elements such as walls, roads and roofs. In order to achieve
this, the street canyon element on which BEP is based was extended from one road
and two rows of buildings on either side to include an additional road and row of
buildings.
In the original BEP, the energy of the incoming radiation from the mesoscale model is
generally not conserved, with residuals in the radiation balance of approximately 10 %
depending on the urban morphology. Sensitivity tests show that the radiative interactions of
roofs with other urban surfaces have potentially a significant effect on the simulated urban
canyon albedo, surface temperatures and subsequently on the long and short wave radiation
balances and meteorological fields. Depending on the canyon geometry, in particular the
height distribution of buildings, differences in the effective urban surface radiation
temperature of more than 2.4 K were simulated between the original and the modified BEP
versions.
The coupled CLM BEP model was first tested for the city of Berlin, Germany. An
algorithm was developed that computes BEP input parameters for each model grid
cell based on a 3d building model that covers the entire city of Berlin (CityGML
format; >460000 buildings). It is shown that the application of BEP significantly
improved the quality of the simulations and enabled CLM to simulate characteristics of
the urban surface energy balance and subsequently the urban heat island effect. |
|
|
|
|
|
|