Mathematics – Logic
Scientific paper
Mar 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993thapc..47....1c&link_type=abstract
Theoretical and Applied Climatology, Volume 47, Issue 1, pp.1-14
Mathematics
Logic
8
Scientific paper
After an accurate search for old documents in Italian archives, the series of the sea surges has been reconstructed for a period of 12 centuries. In addition to written documents, other sources have also been investigated, e.g. the identification marks made by the Venetian Republic at the mean level of the high tides and accurate drawings made in the 18th century by the painter Canaletto with the help of a portable camera obscura. The sea surges at Venice are due to several forcing factors: a low pressure passing over the Mediterranean and generating a Sirocco wind; the barometric effect associated with a gradient of atmospheric pressure over the sea waters; free oscillations in the Adriatic sea; solar and lunar influences; subsidence of the soil. Except for a period which culminated in 1424 1442, when the moon was in perigee and the earth in perihelion, in general the meteorological factors largely dominate over the astronomical ones: the seasonal distribution shows a narrow peak in November December and the series is important to show the frequency of the anomalies in the atmospheric circulations which determined meridional winds over the Adriatic sea. The analysis of the data shows clearly the 18.6 yr lunar nutation influence and a continuous rise of the sea level despite the cooling of the Little Ice Age. The most perturbed period were respectively: 1914 today, due to anthropogenic factors, i.e. excavating of new canals and underground water pumping; 1500 1550, during the Spörer Minimum of solar activity; 1720 1830; 1250 1350, which was also a stormy period in the North Sea. No apparent links with the Maunder Minimum of solar activity were found.
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