Indirect radiative forcing of climate change through ozone effects on the land-carbon sink
Abstract
The evolution of the Earth's climate over the twenty-first century depends on the rate at which anthropogenic carbon dioxide emissions are removed from the atmosphere by the ocean and land carbon cycles. Coupled climate-carbon cycle models suggest that global warming will act to limit the land-carbon sink, but these first generation models neglected the impacts of changing atmospheric chemistry. Emissions associated with fossil fuel and biomass burning have acted to approximately double the global mean tropospheric ozone concentration, and further increases are expected over the twenty-first century. Tropospheric ozone is known to damage plants, reducing plant primary productivity and crop yields, yet increasing atmospheric carbon dioxide concentrations are thought to stimulate plant primary productivity. Increased carbon dioxide and ozone levels can both lead to stomatal closure, which reduces the uptake of either gas, and in turn limits the damaging effect of ozone and the carbon dioxide fertilization of photosynthesis. Here we estimate the impact of projected changes in ozone levels on the land-carbon sink, using a global land carbon cycle model modified to include the effect of ozone deposition on photosynthesis and to account for interactions between ozone and carbon dioxide through stomatal closure. For a range of sensitivity parameters based on manipulative field experiments, we find a significant suppression of the global land-carbon sink as increases in ozone concentrations affect plant productivity. In consequence, more carbon dioxide accumulates in the atmosphere. We suggest that the resulting indirect radiative forcing by ozone effects on plants could contribute more to global warming than the direct radiative forcing due to tropospheric ozone increases.
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Ozone is harmful to vegetation because it impairs photosynthesis via uptake through plant stomata.
“Ozone is harmful to vegetation because it impairs photosynthesis via uptake through plant stomata (Sitch et al., 2007).”
From Local Arctic Air Pollution: A Neglected but Serious Problem (2018) · cites this paper as Sitch et al., 2007
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“Ozone is harmful to vegetation because it impairs photosynthesis via uptake through plant stomata (Sitch et al., 2007).”
BackgroundRadiative forcing due to changes in ozone and methane caused by the transport sector
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- Authors
- Sitch, S., Cox, P. M., Collins, W. J., & Huntingford, C.
- Affiliations
- Met Office (GB)
- University of Exeter (GB)
- UK Centre for Ecology & Hydrology (GB)
- Corresponding author
- Sitch, S.
- Venue
- Nature
- Published
- 2007-07-25
- Volume
- 448
- Issue
- 7155
- Pages
- 791-794
- ISSN
- 0028-0836 (ISSN-L)
- 1476-4687
- OpenAlex
- W2003052024
- Cited by
- 1,019
- References
- 29
- Citations by year
- 2026: 24 · 2025: 36 · 2024: 54 · 2023: 51 · 2022: 47 · 2021: 55 · 2020: 48 · 2019: 69 · 2018: 62 · 2017: 49 · 2016: 49 · 2015: 62 · 2014: 43 · 2013: 71 · 2012: 66
- FWCI
- 64.40
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Nature (publishedVersion)
- PubMed (publishedVersion)
- RePEc: Research Papers in Economics (submittedVersion)
- NERC Open Research Archive (Natural Environment Research Council) (submittedVersion)
- Funders
- Natural Environment Research Council (CEH010010)
- Topics
- Life Sciences › Agricultural and Biological Sciences › Plant Science › Plant responses to elevated CO2
- Physical Sciences › Earth and Planetary Sciences › Atmospheric Science › Atmospheric chemistry and aerosols
- Physical Sciences › Environmental Science › Global and Planetary Change › Climate variability and models
- Keywords
- indirect radiative forcing, terrestrial carbon sink, plant productivity, stomatal closure, CO2 fertilization, ozone deposition, photosynthesis, carbon cycle, climate change, carbon dioxide accumulation
- MeSH terms
- Atmosphere, Carbon, Carbon Dioxide, Ozone, Photosynthesis, Plants, Switzerland, Greenhouse Effect, Ecosystem, Plant Epidermis, Plant Development
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