Feb 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998jastp..60..279p&link_type=abstract
Journal of Atmospheric and Solar-Terrestrial Physics, Volume 60, Issue 3, p. 279-287.
Physics
3
Scientific paper
Since the product of two diurnal waves yields a semidiurnal one plus a mean value, it follows that the product of two functions, each consisting of a constant value plus a diurnal term, provides a constant term plus a diurnal and a semidiurnal component, which prevails over the diurnal one when the phase angles of the diurnal waves are almost opposite. This is the case of the daily variation of atmospheric pressure which, according to the equation of state, is the result of the product of the two corresponding daily variations of the pressure related to (i) the changes of air temperature at constant density, and to (ii) the changes of air density at constant temperature, both showing almost opposite diurnal components, and largely prevailing over their higher harmonics. To verify the above, long time series of hourly values of atmospheric pressure, air density, air temperature and water vapour, observed at hundreds of maritime, continental and high altitude stations, have been analysed both on worldwide and local scales. The results have confirmed what was expected, and explained the prevalence and the higher significance level of the semidiurnal component with respect to the diurnal term of atmospheric pressure. The significant contribution of the daily change of the water vapour pressure on the atmospheric pressure has also been determined and is emphasized.
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