In:
Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, The Royal Society, Vol. 381, No. 2261 ( 2023-11-27)
Abstract:
As part of the CarbonWatch-NZ research programme, air samples were collected at 28 sites around Auckland, New Zealand, to determine the atmospheric ratio ( R CO ) of excess (local enhancement over background) carbon monoxide to fossil CO 2 (CO 2 ff). Sites were categorized into seven types (background, forest, industrial, suburban, urban, downwind and motorway) to observe R CO around Auckland. Motorway flasks observed R CO of 14 ± 1 ppb ppm −1 and were used to evaluate traffic R CO . The similarity between suburban (14 ± 1 ppb ppm −1 ) and traffic R CO suggests that traffic dominates suburban CO 2 ff emissions during daytime hours, the period of flask collection. The lower urban R CO (11 ± 1 ppb ppm −1 ) suggests that urban CO 2 ff emissions are comprised of more than just traffic, with contributions from residential, commercial and industrial sources, all with a lower R CO than traffic. Finally, the downwind sites were believed to best represent R CO for Auckland City overall (11 ± 1 ppb ppm −1 ). We demonstrate that the initial discrepancy between the downwind R CO and Auckland's estimated daytime inventory R CO (15 ppb ppm −1 ) can be attributed to an overestimation in inventory traffic CO emissions. After revision based on our observed motorway R CO , the revised inventory R CO (12 ppb ppm −1 ) is consistent with our observations. This article is part of the Theo Murphy meeting issue 'Radiocarbon in the Anthropocene'.
Type of Medium:
Online Resource
ISSN:
1364-503X
,
1471-2962
DOI:
10.1098/rsta.2022.0204
Language:
English
Publisher:
The Royal Society
Publication Date:
2023
detail.hit.zdb_id:
208381-4
detail.hit.zdb_id:
1462626-3
SSG:
11
SSG:
5,1
SSG:
5,21
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