Cited by 1,019Plant responses to elevated CO2Atmospheric chemistry and aerosolsClimate variability and models

Indirect radiative forcing of climate change through ozone effects on the land-carbon sink

Sitch, S., Cox, P. M., Collins, W. J., Huntingford, C.·2007·Nature

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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Crossref · 10.1038/nature06059

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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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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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