Physics
Scientific paper
Aug 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001e%26psl.191..167l&link_type=abstract
Earth and Planetary Science Letters, Volume 191, Issue 1-2, p. 167-172.
Physics
2
Scientific paper
Continuous measurements of atmospheric CO2 concentrations were carried out along three ship-routes from Italy to Antarctica in 1994/95, 1996/97 and 1998/99. The growth rate of CO2 for four latitudinal belts with arbitrarily chosen boundaries (from 45°N to 80°S) is reported for the three expeditions. The northernmost belt shows the largest growth rate between 1996 and 1998 (close to 6 ppm/yr) while southern belts show an almost constant growth rate of 1.7 ppm/yr. Anthropogenic activities clearly affect both CO2 concentrations and growth rates. δ13C measurements were carried out on CO2 from 23 flask air samples collected during the 1998/99 expedition. Apart from negative values observed in highly polluted areas, a negative trend is observed across the Antarctic Convergence Area with no changes in the atmospheric concentration of CO2. The hypothesis of a biochemical origin of these light carbon isotope values is suggested.
Colombo T.
Giovanelli Giorgio
Lenaz R.
Longinelli Antonio
Ori C.
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