Journal cover Journal topic
Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
Journal topic

Journal metrics

IF value: 5.414
IF 5-year value: 5.958
IF 5-year
CiteScore value: 9.7
SNIP value: 1.517
IPP value: 5.61
SJR value: 2.601
Scimago H <br class='widget-line-break'>index value: 191
Scimago H
h5-index value: 89
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  17 Aug 2020

17 Aug 2020

Review status
This preprint is currently under review for the journal ACP.

North Atlantic Oscillation response in GeoMIP experiments G6solar and G6sulfur: why detailed modelling is needed for understanding regional implications of solar radiation management

Andy Jones1, Jim M. Haywood1,2, Anthony C. Jones3, Simone Tilmes4, Ben Kravitz5,6, and Alan Robock7 Andy Jones et al.
  • 1Met Office Hadley Centre, Exeter, EX1 3PB, UK
  • 2Global Systems Institute, College of Engineering, Mathematics and Physical Sciences, University of Exeter, Exeter, EX44QE, UK
  • 3Met Office, Exeter, EX1 3PB, UK
  • 4Atmospheric Chemistry, Observations and Modeling Laboratory, National Center for Atmospheric Research, Boulder, CO 80307, USA
  • 5Department of Earth and Atmospheric Sciences, Indiana University, Bloomington, IN 47405-1405, USA
  • 6Atmospheric Sciences and Global Change Division, Pacific Northwest National Laboratory, Richland, WA 99352, USA
  • 7Department of Environmental Sciences, Rutgers University, New Brunswick, NJ 08901-8551, USA

Abstract. The realisation of the difficulty of limiting global mean temperatures to within 1.5 °C or 2.0 °C above pre-industrial levels stipulated by the 21st Conference of Parties in Paris has led to increased interest in solar radiation management (SRM) techniques. Proposed SRM schemes aim to increase planetary albedo to reflect more sunlight back to space and induce a cooling that acts to partially offset global warming. Under the auspices of the Geoengineering Model Intercomparion Project, we have performed model experiments whereby global temperature under the high forcing SSP5–8.5 scenario is reduced to follow that of the medium forcing SSP2–4.5 scenario. Two different mechanisms to achieve this are employed, the first via a reduction in the solar constant (experiment G6solar) and the second via modelling injections of sulfur dioxide (experiment G6sulfur) which forms sulfate aerosol in the stratosphere. Results from two state-of-the-art coupled Earth system models both show an impact on the North Atlantic Oscillation (NAO) in G6sulfur but not in G6solar. Both models show a persistent positive anomaly in the NAO during the Northern Hemisphere winter season in G6sulfur, suggesting an increase in zonal flow and an increase in North Atlantic storm track activity impacting the Eurasian continent leading to regional warming. These findings are broadly consistent with previous findings on the impact of stratospheric volcanic aerosol on the NAO and emphasise that detailed modelling of geoengineering processes is required if accurate impacts of SRM impacts are to be simulated. Differences remain between the two models in predicting regional changes over the continental USA and Africa, suggesting that more models need to perform such simulations before attempting to draw any conclusions regarding potential continental-scale climate change under SRM.

Andy Jones et al.

Interactive discussion

Status: open (until 12 Oct 2020)
Status: open (until 12 Oct 2020)
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
[Subscribe to comment alert] Printer-friendly Version - Printer-friendly version Supplement - Supplement

Andy Jones et al.

Andy Jones et al.


Total article views: 140 (including HTML, PDF, and XML)
HTML PDF XML Total BibTeX EndNote
92 45 3 140 1 4
  • HTML: 92
  • PDF: 45
  • XML: 3
  • Total: 140
  • BibTeX: 1
  • EndNote: 4
Views and downloads (calculated since 17 Aug 2020)
Cumulative views and downloads (calculated since 17 Aug 2020)

Viewed (geographical distribution)

Total article views: 115 (including HTML, PDF, and XML) Thereof 115 with geography defined and 0 with unknown origin.
Country # Views %
  • 1



No saved metrics found.


No discussed metrics found.
Latest update: 29 Sep 2020
Publications Copernicus
Short summary
Two different methods of simulating a geoengineering scenario are compared using data from two different Earth system models. One method is very idealised while the other includes details of a plausible mechanism. The results from both models agree that the idealised approach does not capture an impact found when detailed modelling is included, namely that geoengineering induces a positive phase of the North Atlantic Oscillation which leads to warmer, wetter winters in northern Europe.
Two different methods of simulating a geoengineering scenario are compared using data from two...