Solar Radiation Management for Great Barrier Reef

[Robert Tulip]

The Australian Government is investing AUD $1.6 million in SRM work this year.

https://www.barrierreef.org/uploads/RTP_Annual%20Work%20Plan%202019-2020_FINAL.pdf

"Activity: Solar radiation management: 

Description: RRAP [Great Barrier Reef Restoration and Adaptation Program] model predictions indicate that keeping existing corals alive at a large scale would have the biggest impact of all considered interventions. The concept of creating shade through clouds, mist, fog, or surface films assumes that decreased solar radiation protects corals from bleaching. Ecological and physiological factors will be investigated through the foundational knowledge activity. Proof of concepts and assessment of the impact of manipulating solar radiation at scale will underpin risk and environmental impact assessments to be considered under the regulation and policy activity. 

Deliverables: Proof of concept including environmental impact and regulatory assessment. 

Budget:  $1.6m"

[Stephen Salter]

Hi All

Could anyone suggest other input assumptions for the attached calculation about cooling the Barrier Reef. There are two differences between this and other estimates for spray quantity. 

First we want to use a mono-disperse spray of 0.8 microns liquid diameter at the very bottom of the accumulation mode rather than the entire accumulation mode used in some models where the mass of spray at the top skirt of the accumulation mode is 100 times more.  

Second we want to take the initial CCN concentration from Vallina rather than much higher numbers which have been used.

I assume everyone is familiar with Schwartz and Slingo.

I was puzzled why histograms of nucleus size in the atmosphere are not more continuous.  Is is possible that the gap between accumulation mode and Aitken mode is that the nuclei in the missing range have already been grabbed?

The figure of $A1.6 million is close to my estimate for deciding whether or not that we can filter sea water for 0.8 micron drops.

Apologies to people who have already been sent this. You should have sent me your set of assumptions!

Stephen

Emeritus Professor of Engineering Design. School of Engineering, University of Edinburgh, Mayfield Road, Edinburgh EH9 3DW, Scotland S.Sa...@ed.ac.uk, Tel +44 (0)131 650 5704, Cell 07795 203 195, WWW.homepages.ed.ac.uk/shs, YouTube Jamie Taylor Power for Change

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[Stephen Salter]

Hi All

Following the Barrier Reef cooling note Andrew Lockley suggested that I circulate Schwartz and Slingo's interpretation of Twomey's work.  I found it more digestible than Twomey's original papers, even down to engineer's level.

I also attach an appendix to another paper with more graphs and calculations. I have bounced these off Stephen Schwartz.  There is also  another cooling project for which other input assumptions have been requested but, so far, to no effect. 

For an El Niño demonstration we could divide the warm patch into two and write  Morse code message as opposite cloud brightness values in each half.  We would need to superimpose about a week's satellite images to get a convincing contrast increase.

If anyone in the governance community can make a case for the protection of El Niño events please make yourself known.  We may even be able to make them stronger.

Thank you in advance.

Stephen

Emeritus Professor of Engineering Design. School of Engineering, University of Edinburgh, Mayfield Road, Edinburgh EH9 3DW, Scotland S.Sa...@ed.ac.uk, Tel +44 (0)131 650 5704, Cell 07795 203 195, WWW.homepages.ed.ac.uk/shs, YouTube Jamie Taylor Power for Change

On 11/07/2019 13:09, 'Robert Tulip' via geoengineering wrote: