Hi All
Why did they do the albedo change so far to the North?
Stephen
Emeritus Professor of Engineering Design. School of Engineering,
University of Edinburgh, Mayfield Road, Edinburgh EH9 3DW, Scotland
[email protected], Tel +44 (0)131 650 5704, Cell 07795 203 195,
WWW.homepages.ed.ac.uk/shs, YouTube Jamie Taylor Power for Change
On 18/04/2016 14:46, Andrew Lockley wrote:
http://onlinelibrary.wiley.com/wol1/doi/10.1002/2015JC011433/abstract
Assessing climate impacts and risks of ocean albedo modification in
the Arctic
N. Mengis1,*, T. Martin1, D.P. Keller1 andA. Oschlies1,2
DOI: 10.1002/2015JC011433
Journal of Geophysical Research: Oceans
Keywords:
Arctic Ocean Albedo Modification
Abstract
The ice albedo feedback is one of the key factors of accelerated
temperature increase in the high northern latitudes under global
warming. This study assesses climate impacts and risks of idealized
Arctic Ocean albedo modification (AOAM), a proposed climate
engineering method, during transient climate change simulations with
varying representative concentration pathway (RCP) scenarios. We find
no potential for reversing trends in all assessed Arctic climate
metrics under increasing atmospheric CO2 concentrations. AOAM only
yields an initial offset during the first years after implementation.
Nevertheless, sea ice loss can be delayed by 25(60) years in the
RCP8.5(RCP4.5) scenario and the delayed thawing of permafrost soils in
the AOAM simulations prevents up to 40(32) Pg of carbon from being
released by 2100. AOAM initially dampens the decline of the Atlantic
Meridional Overturning and delays the onset of open ocean deep
convection in the Nordic Seas under the RCP scenarios. Both these
processes cause a sub-surface warming signal in the AOAM simulations
relative to the default RCP simulations with the potential to
destabilize Arctic marine gas hydrates. Furthermore, in 2100, the
RCP8.5 AOAM simulation diverts more from the 2005-2015 reference state
in many climate metrics than the RCP4.5 run without AOAM. Considering
the demonstrated risks, we conclude that concerning longer time
scales, reductions in emissions remain the safest and most effective
way to prevent severe changes in the Arctic.
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