Future Anthropogenic Land Use Change Impacts on Carbonaceous Aerosol and Implications for Climate and Air Quality

Shi, Yang; Heald, Colette L.; Val Martin, Maria

doi:10.1029/2024GL110962

Title: Future Anthropogenic Land Use Change Impacts on Carbonaceous Aerosol and Implications for Climate and Air Quality

Journal Article · 12 March 2025 · Geophysical Research Letters

DOI: https://doi.org/10.1029/2024GL110962 · OSTI ID:2530759

^[1]; Heald, Colette L. ^[2];

^[3]

Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States); Eidgenoessische Technische Hochschule (ETH), Zurich (Switzerland)
Univ. of Sheffield (United Kingdom)

Future anthropogenic land use change (LUC) may alter atmospheric carbonaceous aerosol (black carbon and organic aerosol) burden by perturbing biogenic and fire emissions. However, there has been little investigation of this effect. We examine the global evolution of future carbonaceous aerosol under the Shared Socioeconomic Pathways projected reforestation and deforestation scenarios using the CESM2 model from present‐day to 2100. Compared to present‐day, the change in future biogenic volatile organic compounds emission follows changes in forest coverage, while fire emissions decrease in both projections, driven by trends in deforestation fires. The associated carbonaceous aerosol burden change produces moderate aerosol direct radiative forcing (−0.021 to +0.034 W/m²) and modest mean reduction in PM_2.5 exposure (−0.11 μg/m³ to −0.23 μg/m³) in both scenarios. We find that future anthropogenic LUC may be more important in determining atmospheric carbonaceous aerosol burden than direct anthropogenic emissions, highlighting the importance of further constraining the impact of LUC.>

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Research Organization:: Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC)

Grant/Contract Number:: SC0022017

OSTI ID:: 2530759

Journal Information:: Geophysical Research Letters, Journal Name: Geophysical Research Letters Journal Issue: 6 Vol. 52; ISSN 1944-8007; ISSN 0094-8276

Publisher:: American Geophysical Union (AGU)Copyright Statement

Country of Publication:: United States

Language:: English

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