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3. The long-range variability of annual precipitation in Prague - Klementinum in the period 1805-1951 and in relation to the solar activity

Creator:
Křivský, Ladislav
Format:
bez média and svazek
Type:
model:article and TEXT
Subject:
astrophysics and solar activity
Language:
Czech
Description:
The condition of measurement of precipitation from the year 1805 up-to the present time are defined. On the vasis of an analysis of the conditions and by comparison with the neighbouring stations a whole series of annual percipitation is homogenized. The original values in the period 1805-1830 are reduced for 8.7 %, the period 1840-1905 zemains unchanged, the period 1906-1951 is reduced partly for 10 % (Hlaváč), partly for 15 %. For the statement of long-range variability of the annual precipitation the method of double-time integral of precipitation deviations was used. The curves thus gained show a long-range variation having a contraty course regarding the secular curve of solat activity (90-year-rhythm). The long-range relation of the variability of annual precipitation to the secular solar activity is expounded by the change of circulation (showing the width of the frontal zone). Further a close connection between the course of yearly precipitaton nd Ejgenson´s Index of Recurrency of Sunspots was found, which is evidently applicable for Central-Europe. Immediately after the maximum of Recurrency Index there is a characteristic decrease of precititation, closely following the minimum of Recurrency Index there is remarkable rise. On the ground of extrapolation of the acquired secular curves of precipitation and on the ground of physically justified correlation with long-range solar activity, a prognosis of the course of the annual precipitation up to the year 2000 is defined. At present the long-range course of precipitaton shows the minimum, in the years 1970-1990 the precipitation should reach the secular maximum.
Rights:
http://creativecommons.org/publicdomain/mark/1.0/ and policy:public