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Climate/chemistry feedbacks and biogenic emissions.

John A Pyle1, Nicola Warwick, Xin Yang

  • 1National Centre for Atmospheric Science, University of Cambridge, Cambridge, UK. john.pyle@atm.ch.cam.ac.uk

Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
|May 22, 2007
PubMed
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Future climate change may alter atmospheric oxidizing capacity, impacting surface ozone levels and human health. Increased isoprene emissions are projected to raise ozone in the Northern Hemisphere but lower it in the tropics.

Area of Science:

  • Atmospheric chemistry
  • Climate change impacts
  • Environmental science

Background:

  • Anthropogenic emissions influence atmospheric oxidizing capacity.
  • Future climate change is projected to alter atmospheric composition and chemistry.
  • Surface ozone changes have significant implications for human health.

Purpose of the Study:

  • To investigate the impact of increased isoprene emissions on future surface ozone concentrations.
  • To assess the sensitivity of ozone changes to background chemical regimes.
  • To consider the role of bromine compounds in future tropospheric chemistry.

Main Methods:

  • Model calculations simulating future climate scenarios.
  • Sensitivity analysis of isoprene emission changes due to temperature increases.

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  • Evaluation of ozone responses across different chemical regimes and geographic regions.

    • Main Results:

    • Increased isoprene emissions significantly alter surface ozone levels.
    • Ozone is projected to increase in the Northern Hemisphere but decrease in the tropics with higher isoprene.
    • The impact of bromine compounds on tropospheric chemistry may change in a future climate.

    Conclusions:

    • Future biogenic emissions, particularly isoprene, play a crucial role in determining surface ozone trends.
    • Ozone responses to increased isoprene are regionally dependent, highlighting complex atmospheric interactions.
    • Further research is needed to fully understand the evolving role of bromine in future atmospheric chemistry.