A study of greenhouse gases and air trajectories at Plateau Rosa |
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Authors: | A Longhetto F Apadula P Bacci P Bonelli C Cassardo S Ferrarese C Giraud and C Vannini |
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Institution: | (1) Istituto di Fisica Generale, Università di Torino, Torino, Italy;(2) Istituto di Cosmogeofisica, CNR, Torino, Italy;(3) ENEL/CRAM, Milano, Italy;(4) Dipartimento di Scienze e Tecnologie Avanzate, Università di Torino II Facoltà delle Scienze Matematiche, Fisiche e Naturali, Alessandria, Italy |
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Abstract: | Summary The attention paid to changes in atmospheric concentrations of greenhouse gases has recently increased, with particular regard
to the relationships between variations of their annual trends and of their shorter-period fluctuations on the one hand, and
some geophysical and biological natural processes (like atmospheric transport, volcanic eruptions, ENSO events, seasonal vegetation
cycles, and so on) on the other hand. Careful analysis and interpretation of the above relationships, in fact, can often disclose
unknown mechanisms acting on modulations of these gases and make it possible for us to better understand the contributions
made to them by natural causes, contrasted with anthropogenic ones. This paper presents and discusses the results of a series
of CO2 air concentration data, measured at Plateau Rosa (3480 m a.s.l.—Italian Western Alps) over a period of about four years,
and correlated with atmospheric transport processes on synoptic scale. These results have shown the leading role played by
some kinds of atmospheric circulation patterns in creating situations of not fully mixed air streams (and, as such, not representative
of background conditions) and have also suggested a ?meteorological? selection scheme for CO2 data to be used in evaluating more reliable annual trends. |
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Keywords: | Meteorology |
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