[geo] 1st August Deadline for abstract submission - solar geoengineering session at AGU

[p.j.irvine]

Hi all,

A reminder that the abstract deadline for AGU is coming up and that we have 
a session on solar geoengineering. Submit here:

https://agu.confex.com/agu/fm18/prelim.cgi/Session/45737

Session description follows.

Cheers,

Pete

   - GC041: Evaluating the feasibility and consequences of solar 
   geoengineering

Solar geoengineering is a term that describes a set of proposals to 
directly alter the Earth’s radiation balance to reduce the risks of climate 
change. Understanding whether and how solar geoengineering could play a 
role alongside emissions reductions, carbon removal and adaptation as a 
response to climate change poses serious scientific challenges. This 
session will present work that addresses three of these challenges:

Can a substantial negative radiative forcing (e.g., 1-4 Wm-2) be 
practically achieved?

What is the climate response to radiative forcing from solar geoengineering?

What are the non-climate environmental risks or impacts of specific methods 
of solar geoengineering?

Research on comparative risk assessments is particularly encouraged, i.e. 
how do the risks of solar geoengineering compare to the risks without solar 
geoengineering?

The oral session will conclude with a 30 minute panel discussion. In this 
discussion we will reverse the usual format and invite the audience to 
answer questions posed by the speakers.

https://agu.confex.com/agu/fm18/prelim.cgi/Session/45737

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[geo] Climate Response to Aerosol Geoengineering: A Multimethod Comparison

[Andrew Lockley]

https://journals.ametsoc.org/doi/10.1175/JCLI-D-17-0620.1#.W1WjG-mbCfM.twitter

Climate Response to Aerosol Geoengineering: A Multimethod Comparison
Helene Muri
Section for Meteorology and Oceanography, Department of Geosciences,
University of Oslo, Oslo, and Industrial Ecology Program, Department of
Energy and Process Engineering, Norwegian University of Science and
Technology, Trondheim, Norway
Jerry Tjiputra, Odd Helge Otterå, Muralidhar Adakudlu and Siv K. Lauvset
Uni Research Climate, Bjerknes Centre for Climate Research, Bergen, Norway
Alf Grini and Michael Schulz
Meteorological Institute, Oslo, Norway
Ulrike Niemeier
Max Planck Institute for Meteorology, Hamburg, Germany
Jón Egill Kristjánssona
Section for Meteorology and Oceanography, Department of Geosciences,
University of Oslo, Oslo, Norway
Denotes content that is immediately available upon publication as open
access.
Supplemental information related to this paper is available at the Journals
Online website: https://doi.org/10.1175/JCLI-D-17-0620.s1.
a Deceased.
© 2018 American Meteorological Society. For information regarding reuse of
this content and general copyright information, consult the AMS Copyright
Policy (www.ametsoc.org/PUBSReuseLicenses).
*Corresponding author*: Helene Muri, helene.muri@ntnu.noJournal of Climate
Vol. 31: , Issue. 16
, : Pages. 6319-6340
(Issue publication date: August 2018)Received Date: September 20, 2017
Final Form: April 19, 2018https://doi.org/10.1175/JCLI-D-17-0620.1
Abstract

Considering the ambitious climate targets of the Paris Agreement to limit
global warming to 2°C, with aspirations of even 1.5°C, questions arise on
how to achieve this. Climate geoengineering has been proposed as a
potential tool to minimize global harm from anthropogenic climate change.
Here, an Earth system model is used to evaluate the climate response when
transferring from a high CO2 forcing scenario, RCP8.5, to a
middle-of-the-road forcing scenario, like RCP4.5, using aerosol
geoengineering. Three different techniques are considered: stratospheric
aerosol injections (SAI), marine sky brightening (MSB), and cirrus cloud
thinning (CCT). The climate states appearing in the climate geoengineering
cases are found to be closer to RCP4.5 than RCP8.5 and many anthropogenic
global warming symptoms are alleviated. All three techniques result in
comparable global mean temperature evolutions. However, there are some
notable differences in other climate variables due to the nature of the
forcings applied. CCT acts mainly on the longwave part of the radiation
budget, as opposed to MSB and SAI acting in the shortwave. This yields a
difference in the response, particularly in the hydrological cycle. The
responses in sea ice, sea level, ocean heat, and circulation, as well as
the carbon cycle, are furthermore compared. Sudden termination of the
aerosol injection geoengineering shows that the climate very rapidly
(within two decades) reverts to the path of RCP8.5, questioning the
sustainable nature of such climate geoengineering, and simultaneous
mitigation during any such form of climate geoengineering would be needed
to limit termination risks.
Keywords: Atmosphere; Ocean; Clouds; North Atlantic Oscillation; Carbon
cycle; General circulation models

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Re: [geo] Geo. and the Anthropocene

[Greg Rau]

Pay walled.
But from the abstract "...we aim to raise doubts on the dominant perspective on 
the organisation of climate engineering, which assumes these approaches to be 
regulated through legalistic means. Drawing an analogy to the early development 
stages of nuclear weapons, we point out that, instead of following a legalistic 
rationale, climate engineering organisation might pursue a logic of technical 
feasibility, political acceptance and bureaucratic momentum."  
GR For us mere scientists, what are "legalistic means" (legal means?) , and why 
is it assumed that organization based on technical feasibility, political 
acceptance and bureaucratic momentum cannot also have a legalistic 
underpinning?  Why consider regulation by legalistic means if what is being 
regulated is not technically feasible, politically acceptable and having 
bureaucratic momentum?

Sent from the Rau's iPad

> On Jul 22, 2018, at 5:39 PM, Wil Burns  wrote:
> 
> FYI. Wil
> 
> Markus Lederer, et al., Organising the unthinkable in times of crises: Will 
> climate engineering become the weapon of last resort in the Anthropocene?
> 25(4) Organization (2018), 
> http://journals.sagepub.com/doi/abs/10.1177/1350508418759186
> 
> wil
> 
> 
> [photo]
> 
> Dr. Wil Burns
> Co-Executive Director, Forum for Climate Engineering Assessment, School of 
> International Service, American University & Professor of Research
> 
> 650.281.9126 | w...@feronia.org | 
> http://www.ceassessment.org | Skype: 
> wil.burns
>  |
> 2650 Haste St., Towle Hall #G07, Berkeley, CA 94720| View my research on my 
> SSRN Author page: http://ssrn.com/author=240348
> 
> [https://s3.amazonaws.com/images.wisestamp.com/icons_32/linkedin.png]
>  [https://s3.amazonaws.com/images.wisestamp.com/icons_32/twitter.png] 
> 
> 
> 
> 
> 
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> 

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