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Might dimming the sun change atmospheric ENSO teleconnections as we know them?

Author(s): Braesicke P, Morgenstern O, Pyle J

Published: September, 2010

Publisher: Atmospheric Science Letters

DOI: 10.1002/asl.294

Tags: Stratospheric Aerosols, Environmental Side-Effects, Climate Modelling

URL: http://onlinelibrary.wiley.com/doi/10.1002/asl.294/abstract

Abstract: We use a troposphere–stratosphere chemistry-climate model to investigate the impact of a 10% reduction in solar irradiance. Starting from the changes in global mean surface temperature modelled, we study changes of forced atmospheric variability. Large increases in ozone interacting with the meteorology are modelled, exemplified by changes in El Niño/Southern Oscillation (ENSO)-related teleconnection patterns. The observed Northern Hemisphere centre of action at 50 hPa, modelled in our base integration, disappears in the run with reduced solar irradiance. This change in forced stratospheric variability highlights the point that the assessment of geoengineering schemes need to consider many possible feedbacks.


Geoengineering the climate: science, governance and uncertainty

Author(s): Shepherd JG, Caldeira K, Cox PM, Haigh J, Keith DW, Launder B, Mace GM, MacKerron G, Pyle J, Rayner S, Redgwell C, Watson AJ

Published: September, 2009

Publisher: The Royal Society

Tags: Overview

URL: http://royalsociety.org/policy/publications/2009/geoengineering-climate/

Abstract: Man-made climate change is happening and its impacts and costs will be large, serious and unevenly spread. The impacts may be reduced by adaptation and moderated by mitigation, especially by reducing emissions of greenhouse gases. However, global efforts to reduce emissions have not yet been sufficiently successful to provide confidence that the reductions needed to avoid dangerous climate change will be achieved. This has led to growing interest in geoengineering, defined here as the deliberate large-scale manipulation of the planetary environment to counteract anthropogenic climate change.


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