Luni-solar periodic components in precipitation data

Details Luni-solar periodic components in precipitation data Luni-solar periodic components in precipitation data

Jan 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987georl..14...45c&link_type=abstract

Geophysical Research Letters, Volume 14, Issue 1, p. 45-48

Mathematics

Logic

7

Scientific paper

Evidence of a tidal influence from luni-solar gravitational fields has been highlighted by analysing daily precipitation data collected at many stations in the Alps and the Po Valley (Italy) over the 1970-81 period. Tidal influence as the possible result of a modulation effect caused by luni-solar cycles having similar lengths, does not appear to be strictly constant over time. Time variations in daily precipitation data as a function of some particular cycles show that gravitational tides affect heavy precipitation more than mean precipitation values. ``Semimonthly'' oscillations have been derived from trends in daily precipitation data grouped according to the age of distinct lunar months. The investigation of the combined effects of different luni-solar components, relating to years of particular climatological interest, might assist in the prediction of extreme precipitation.

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