Temperature and Moisture Conditions in Medium Low-exchange Nocturnal Radiation Periods 1992

Statistical Base

For the western part of the city, the statistical base was already laid with the first edition of the Environmental Atlas (SenStadtUm 1985). During the period between 1981 and 1983 respectively in the summer semester in nocturnal radiation periods with weak to moderate winds air temperature and relative humidity measurements were taken. Altogether four measuring trips were undertaken along four different routes. The individual routes included areas of different use categories and development density in order to obtain a representative basis of interpolation for those areas where no measurements had been taken.

For the eastern part of the city, data were collected for the period of May till the end of September 1991. Twenty-four measuring trips were undertaken along five routes. One of these measuring trips was laid out as East-West connecting route from Rahnsdorf up to Grunewald. As a complement to this program, 17 measuring trips from the center of the city to the surrounding countryside were undertaken predominantly in the Summer 1992 along four routes, to determine the climatic significance for the burdened inner city of the open spaces on the outskirts of town. All excursions 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 measuring trip network was augmented by the data from 38 climate stations. The measurements of air temperature and humidity were taken as a rule from an elevation of 2 meters. The vapor pressure values were calculated based on the temperature and relative humidity.