European Geosciences Union Publishes Study, Geoengineering Could Disrupt Rainfall Patterns

Geoengineering Could Disrupt Rainfall Patterns

Geoengineering Could Disrupt Rainfall Patterns

ScienceDaily (June 6, 2012) — A geoengineering solution to climate change could lead to significant rainfall reduction in Europe and North America, a team of European scientists concludes. The researchers studied how models of Earth in a warm, CO2-rich world respond to an artificial reduction in the amount of sunlight reaching the planet’s surface.

The study is published June 6, 2012,  in Earth System Dynamics, an Open Access journal of the European Geosciences Union (EGU). (…) Emphasis added.


ESD pdf


Solar irradiance reduction to counteract radiative forcing from a
quadrupling of CO2: climate responses simulated by four earth
system models
H. Schmidt1, K. Alterskjær2, D. Bou Karam3, O. Boucher4,*, A. Jones4, J. E. Kristj´ansson2, U. Niemeier1, M. Schulz5,
A. Aaheim6, F. Benduhn7, M. Lawrence7,**, and C. Timmreck1
1Max Planck Institute for Meteorology, Hamburg, Germany
2University of Oslo, Oslo, Norway
3Laboratoire des Sciences du Climat et l’Environnement, CEA, CNRS, UVSQ, Gif-sur-Yvette, France
4Met Office Hadley Centre, Exeter, UK
5Norwegian Meteorological Institute, Oslo, Norway
6Cicero, Oslo, Norway
7Max Planck Institute for Chemistry, Mainz, Germany
*now at: Laboratoire de M´et´eorologie Dynamique, Institut Pierre Simon Laplace/CNRS, Paris, France
**now at: Institute for Advanced Sustainability Studies, Potsdam, Germany
Correspondence to: H. Schmidt (
Received: 13 January 2012 – Published in Earth Syst. Dynam. Discuss.: 25 January 2012
Revised: 8 May 2012 – Accepted: 14 May 2012 – Published: 6 June 2012


In this study we compare the response of four
state-of-the-art Earth system models to climate engineering
under scenario G1 of two model intercomparison projects:
GeoMIP (Geoengineering Model Intercomparison Project)
and IMPLICC (EU project “Implications and risks of engineering
solar radiation to limit climate change”). In G1,
the radiative forcing from an instantaneous quadrupling of
the CO2 concentration, starting from the preindustrial level,
is balanced by a reduction of the solar constant. Model responses
to the two counteracting forcings in G1 are compared
to the preindustrial climate in terms of global means
and regional patterns and their robustness. While the global
mean surface air temperature in G1 remains almost unchanged
compared to the control simulation, the meridional
temperature gradient is reduced in all models. Another robust
response is the global reduction of precipitation with
strong effects in particular over North and South America
and northern Eurasia. In comparison to the climate response
to a quadrupling of CO2 alone, the temperature responses are
small in experiment G1. Precipitation responses are, however,
in many regions of comparable magnitude but globally
of opposite sign.


See complete pdf  here.



Also see;

Geoengineering would turn blue skies whiter

  01 June 2012 by Jeff Hecht

Blue skies would fade to hazy white if geoengineers inject light-scattering aerosols into the upper atmosphere to offset global warming. Critics have already warned that this might happen, but now the effect has been quantified.

Releasing sulphate aerosols high in the atmosphere should in theory reduce global temperatures by reflecting a small percentage of the incoming sunlight away from the Earth. However, the extra particles would also scatter more of the remaining light into the atmosphere. This would reduce by 20 per cent the amount of sunlight that takes a direct route to the ground, and it would increase levels of softer, diffuse scattered light, says Ben Kravitz of the Carnegie Institution for Science in Stanford, California.

That would have knock-on effects for life – and human technology.(…)






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