Seasonal and diurnal variations of δ¹³C and concentration of atmospheric CO₂ at Parma, Italy

• Autorzy: Longinelli A. , Selmo E.
• Konferencja: Stable isotope records of environmental change. European Society for Isotope Research. VII Isotope Workshop, Graz 2004
• Języki publikacji: EN

Abstrakty

EN

The δ¹³C of atmospheric CO₂ from discrete air samples collected at the University campus, Parma, Italy, was measured at time intervals of about five days over a period of 18 months. Some day and night samples were measured along with three daily time series to evaluate the daily variations of δ¹³C values and CO₂ concentrations. The following patterns were revealed: (1) the least negative δ¹³C values show a seasonal evolution with slightly more negativevalues during winter and less negative values during summer. Home heating systems probably contribute to this behaviour; (2) four samples collected in down town Parma show more negative values than those collected at the same time at the University campus, probably be cause of car engine pollution; (3) occasionally, quite negative δ¹³C values were obtained at the campus. The expansion of polluted air masses from down town to the suburban area may be responsible for these negative events; (4) one sample showed a δ¹³C of -17.67‰. The nearby fields had been extensively manured and the contribution from organic matter fermentation may explain the exceptionally negative result; (5) the diurnal changes in δ¹³C are relatively low from January to May; (6) in July and September the major daily changes take place in the late evening and in the early morning and are very fast. During the night the CO₂ concentration in creases by no more than some 50-60%, this behaviour differing from observations by other authors in different areas; (7) the set of daily samples collected in August shows a different behaviour, clearly related to the heavy rain that lasted for several hours during the night.

Słowa kluczowe

EN

atmosphere; carbon dioxide; environment; anthropogenic emissions; carbon isotopes

• Wydawca: Państwowy Instytut Geologiczny - Państwowy Instytut Badawczy
• Czasopismo: Geological Quarterly
• Rocznik: 2005
• Tom: Vol. 49, No. 2
• Strony: 127--134
• Opis fizyczny: Bibliogr. 15 poz., tab., wykr.

Twórcy

autor

Longinelli A.

• Department of Earth Sciences, University of Parma, Parco Area delle Scienze 157 A, 43100 Parma, Italy

autor

Selmo E.

• Department of Earth Sciences, University of Parma, Parco Area delle Scienze 157 A, 43100 Parma, Italy

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