, Volume 50, Issue 1-2, pp 15-22

On the seasonal variation of local relationships between temperature, temperature range, sunshine and cloudiness

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Summary

At Berlin-Dahlem, monthly single station data on cloudiness, sunshine duration, mean, maximum and minimum temperature is statistically analyzed for the time period 1955–1993.

It is found that sunshine duration varies inversely with cloud cover; cloud cover correlates negatively with temperature range. Cloud cover correlates negatively with temperature between March and September, and positively with temperature during the remaining months.

Between 1955 und 1993, there are no significant changes in temperature range in any month but June and September, when a decline occurred.

Sunshine declined significantly in March, June and September. Trends between 1955 and 1987 indicate a larger decline of sunshine and decline in temperature range than between 1955 and 1993.

Locally, sulfate deposition, which may be taken as an indicator of the atmospheric sulfate load, decreased by more than a third between the mid-1950s and the late 1980s. Therefore, at Berlin, the observed increase of cloudiness (decrease of sunshine duration) between the 1950s and the late 1980s went parallel to the measured decrease of sulfate deposition.