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National Repository of Grey Literature 2 records found  Search took 0.01 seconds. 
Lengths of new grapevine sprouts as a contribution to reconstruction of spring air temperatures in the 18th century
 Střeštík, Jaroslav ; Verö, J.
Lengths of grapevine sprouts measured on the 24th April since 1740 and archived in the town museum in Köszeg have been compared with air temperatures observed in March and April at different station in the vicinity. Correlation coefficients reach more than 0.6 and decrease with the increasing distance from Köszeg. Also the long-term course of spring temperature and grapevine sprouts corresponds to each other. Correlation was higher when temperatures were compared with logarithms or square roots of the grapevine lengths. Correlations of the lengths with other quantities were poor. These results confirm that during 1740 to 1780 spring temperatures were relatively high, surely higher than those in the 19th century.
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Reconstruction of spring air temperatures in the 18th century based on the lengths of grapewine sprouts
 Střeštík, Jaroslav ; Verö, J.
Lengths of new grapewine sprouts measured in Köszeg, Hungary, since 1740, exhibit a good correlation with the average temperatures in April, even better for temperatures squared. There is also a weak correlation with the relative air humidity, and no correlation with solar activity.
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