Environmental measurements at Monte Cimone GAW station
by Marco Alemanno; Attilio Di Diodato; Luigi Lauria; Nicola Santobuono
International Journal of Global Warming (IJGW), Vol. 6, No. 4, 2014

Abstract: Continuous atmospheric CO₂ measurements performed by IAFMC at Mt. Cimone Observatory in the period 1980-2009 were analysed in order to select data representing background concentrations. A filtering technique was used to smooth background data and to separate the annual cycle from the long-term increase. The average growth rate of CO₂ was found to be 1.708 ± 0.003 ppm/year, while annual cycle amplitude was 11.42 ± 1.48 ppm. From spectrum analysis of detrended data significant interannual contributions (periods of about four years and of about 2.5 years) were found. Moreover, a strong positive correlation between CO₂ growth rate and global temperature anomalies was found. A statistical model was applied on column ozone data measured in Sestola in the period 1979-2010 in order to separate natural cyclic contributions from the anthropogenic contribution, which is given by a piecewise-linear trend with a turning point in January 1996. We estimated a trend equal to −1.61 ± 0.41 D.U./year before turning point, and a trend of +1.06 ± 1.18 D.U./year after turning point. Finally, a net decrease in annual maximum of near-noon UV index was found from 2005 in Sestola and in the period 1996-2009.

Online publication date: Sat, 13-Dec-2014

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