Conference paper

Climatic variations at Trieste during the last century

Franco Stravisi ; C.N.R. Instituto Talassografico di Trieste, Italy

Abstract

The time series of the annual values of eight climatic elements (atmospheric pressure, air temperature, relative humidity, precipitations, "bora" and southerly winds frequencies, sunshine duration and sea level) recorded at Trieste , northern Adriatic , in the years 1871 - 1985 are reported and analysed. The characteristic spectra are computed by means of least squares method: the most significant periods are 50, 24, 18.30, 12.70, 10.90, 7.80, 4.96, 4.62, 3.67, 3.42, 2.97, and 2.25 years, the last one corresponding to the quasi-biennial oscillation of 27 months.

The linear trends show an almost stationary pressure, an increase of the air temperature (+ 0.003°C a -1 ), a decreasing relative humidity (- 0.03% a -1 ), decreasing precipitations (- 1.5 mm a -1 .), a reduction of "bora" and an increase of southerly winds (- 0.3 and + 0.3 days per year respectively), a reduction of the sunshine duration (- 1.6 h a -1 ) and an increase of the sea level (+ 0.13 cm a -1 ).

Keywords

Climatic variations; Trieste

Hrčak ID:

20863

URI

https://hrcak.srce.hr/20863

Publication date:

1.12.1987.

Article data in other languages: croatian

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