A study on greenhouse gas emissions from asphalt pavement cross-sections: a comparison between roadside and central areas.

Authors

Meng Zhou, Hongliang Wu, Yao Jiang, Feng Yan

Published in

Environmental monitoring and assessment. Volume 198. Issue 8. Jul 03, 2026. Epub Jul 03, 2026.

Abstract

This study employed a greenhouse gas flux monitoring system equipped with LI-COR 7810/7820 portable trace gas analyzers to measure daily fluxes of CO₂, CH₄, and N₂O across asphalt pavement sections during three time periods (8:00-9:00 AM, 1:00-2:00 PM, 6:00-7:00 PM). Using high-frequency data obtained from the analyzers, precise fluxes were calculated via an exponential fitting model in SoilFluxPro software. A comprehensive assessment, integrating spatiotemporal statistical analysis and global warming potential (GWP), was conducted. The results revealed the following: (i) Spatial distribution: Asphalt road surfaces act as carbon sources along both sides, with an average GWP of 920.762 nmol·m⁻²·s⁻¹ per day, while the central section serves as a weak carbon sink, with an average GWP of -73.685 nmol·m⁻²·s⁻¹ per day. (ii) Temporal distribution: Greenhouse gas emissions from asphalt pavements are higher during the daytime and lower at night. (iii) Gas composition: CO₂ is the dominant contributor to greenhouse gas fluxes from asphalt pavements, accounting for over 98% of total emissions. (iv) Primary drivers: The primary source of greenhouse gas emissions from asphalt pavements is the organic debris covering the soil and vegetation along roadside areas.

PMID:
42397608
Bibliographic data and abstract were imported from PubMed on 03 Jul 2026.

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