Temperature in Medium Low-exchange Nocturnal Radiation Periods 2000
For the western part of the city, the statistical base was already created with the first edition of the Environmental Atlas (SenStadtUm 1985). During the period between 1981 and 1983, measurements of air temperature and relative humidity were taken in each summer semester during nocturnal radiation periods with weak to moderate winds. Altogether four measurement trips were undertaken along four different routes. The individual routes included areas of different use categories and development densities, in order to obtain a representative basis for interpolation for those areas where no measurements had been taken.
East Berlin and the Surrounding Countryside
For the eastern part of the city, data were collected for the period from May through September 1991. Twenty-four measurement trips were undertaken along five routes. One of these was an East-West connecting route, from Rahnsdorf to the Grunewald. As a complement to this program, 17 measurement trips from the center of the city to the surrounding countryside were undertaken, mostly during the summer of 1992, along four routes, to determine the climatic significance of the open spaces on the outskirts of the city for the burdened inner city area. All trips were undertaken in nocturnal radiation periods (9:00 p.m. – 2:00 a.m. CET, degree of cloudiness below 4/8) under low-exchange weather conditions (wind speed up to 4 m/s).
The measurement trip grid was augmented by the data from 38 climate stations. The measurements of air temperature and humidity were generally taken at an elevation of 2 meters.
Update of the Data Base in 2000
The changes of the use structures in the building stock and also the changed usage of open spaces were expected to cause climatic effects in many places of the city. Another investigation program was therefore undertaken from September through November of 1999 for the classification of the relevant new construction and dense-structure areas. The data from 13 climate stations of the TU Measurement Network as well as the Weather Map of the Free University of Berlin were analyzed; three addition stations were built in the context of the investigation program. Moreover, during the same time period, 12 nocturnal measurement trips were carried out through representative and structurally changed areas.
For the situation of land use in Berlin as of 2000, all areas with change potentials of city-wide significance, the construction of which had already been realized in 2000, were taken into account, on the basis of the data from the land-use survey conducted by ID 1 of the Senate Department for Urban Development. In order to also be able to incorporate building projects which had already been initiated, areas were also taken into account on which the projects were slated for completion by 2002.