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- W2080893369 abstract "Atmospheric CO 2 mixing ratios and C and O isotopic compositions are reported for the Los Angeles basin in southern California, a region renowned for its air pollution. Air samples collected midday on the Caltech campus in Pasadena, California, contained ∼30 ppm more CO 2 in 1998–2003 than in 1972–1973 (averaging 397 ppm in 1998–2003 and 366 ppm in 1972–1973) compared to a 47 ppm change in background air CO 2 , yet the ranges of the carbon and oxygen isotopic compositions remained essentially constant. Because the 1998–2003 data show a significant progression through time, analysis was done on data from 2002 to 2003 complete calendar years (CO 2 mixing ratios increased 41 ppm between 1972 and 1973 and 2002–2003). Both 1972–1973 and 2002–2003 data sets display significant correlation between δ 13 C and 1/[CO 2 ] with local CO 2 source end‐member δ 13 C values of −30.9 ± 0.5‰ for 1972–1973 and −29.9 ± 0.2‰ for 2002–2003 (1 σ errors). Mass balance calculations explain that this apparently coincidental similarity reflects a change in the relative proportion of natural gas and petroleum products burned in the region combined with a change in the origin, and thus isotopic composition, of the petroleum burned. The δ 13 C of the average CO 2 inventory in Pasadena can be explained by local addition to background air of 38 ± 4 ppm CO 2 in 1972–1973 and 29 ± 3 ppm in 2002–2003 from anthropogenic sources, in seeming contradiction to the known increase in CO 2 emissions between these two time periods." @default.
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- W2080893369 date "2008-12-05" @default.
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- W2080893369 title "Changes in mixing ratio and isotopic composition of CO<sub>2</sub>in urban air from the Los Angeles basin, California, between 1972 and 2003" @default.
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- W2080893369 doi "https://doi.org/10.1029/2008jd009999" @default.
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