Hi All If my decrypting of the Met. Speak encoding is correct this sounds quite encouraging. The 50% increase in nuclei concentration under clouds is quite a modest dose. Working at latitudes between 30N and 30S at the same spray with the full dispersion width of the accumulation mode of aerosol sizes is so boring. It would interesting to know what the concentrations were before treatment so that we could calculate the amount spray and the number of spray vessels needed.
If the concentrations were like the ones given by Vallina in doi:10.1029/2006GB002787 and the spray was monodisperse with a liquid diameter of 0.8 microns so as to avoid wasting energy on spraying salt mass very much heavier than Kohler would recommend, we would need about a hundred vessels spraying 15 kg of water per second. They will not all be working at full power and not all in the right place at the right time but some of this would be offset by an even more sophisticated planning of vessel movements based on real-time satellite observations and clever climate planners with ginormous quantum computers. I predict that they would find the temperature gradients across oceans a very useful guide. Stephen Emeritus Professor of Engineering Design School of Engineering Mayfield Road EH9 3 DW University of Edinburgh Scotland. Tel 0131 662 1180 From: [email protected] <[email protected]> On Behalf Of Andrew Lockley Sent: 09 February 2021 15:27 To: geoengineering <[email protected]> Subject: [geo] Extreme climate response to marine cloud brightening in the arid Sahara-Sahel-Arabian Peninsula zone This email was sent to you by someone outside the University. You should only click on links or attachments if you are certain that the email is genuine and the content is safe. Extreme climate response to marine cloud brightening in the arid Sahara-Sahel-Arabian Peninsula zone Yuanzhuo Zhu Climate Modeling Laboratory, School of Mathematics, Shandong University, Jinan, China Zhihua Zhang Climate Modeling Laboratory, School of Mathematics, Shandong University, Jinan, China and MOE Key Laboratory of Environmental Change and Natural Disaster, Beijing Normal University, China, and M. James C. Crabbe Wolfson College, Oxford University, Oxford, UK; Institute of Biomedical and Environmental Science and Technology, University of Bedfordshire, Luton, UK and School of Life Sciences, Shanxi University, Taiyuan, China Abstract Purpose – Climatic extreme events are predicted to occur more frequently and intensely and will significantly threat the living of residents in arid and semi-arid regions. Therefore, this study aims to assess climatic extremes’ response to the emerging climate change mitigation strategy using a marine cloud brightening (MCB) scheme. Design/methodology/approach – Based on Hadley Centre Global Environmental Model version 2- Earth System model simulations of a MCB scheme, this study used six climatic extreme indices [i.e. the hottest days (TXx), the coolest nights (TNn), the warm spell duration (WSDI), the cold spell duration (CSDI), the consecutive dry days (CDD) and wettest consecutive five days (RX5day)] to analyze spatiotemporal evolution of climate extreme events in the arid Sahara-Sahel-Arabian Peninsula Zone with and without MCB implementation. Findings – Compared with a Representative Concentration Pathways 4.5 scenario, from 2030 to 2059, implementation of MCB is predicted to decrease the mean annual TXx and TNn indices by 0.4–1.7 and 0.3– 2.1°C, respectively, for most of the Sahara-Sahel-Arabian Peninsula zone. It would also shorten the mean annual WSDI index by 118–183 days and the mean annual CSDI index by only 1–3 days, especially in the southern Sahara-Sahel-Arabian Peninsula zone. In terms of extreme precipitation, MCB could also decrease the mean annual CDD index by 5–25 days in the whole Sahara and Sahel belt and increase the mean annual RX5day index by approximately 10 mm in the east part of the Sahel belt during 2030–2059. -- You received this message because you are subscribed to the Google Groups "geoengineering" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]<mailto:[email protected]>. To view this discussion on the web visit https://groups.google.com/d/msgid/geoengineering/CAJ3C-04HOfk0QwA4LLgjsf5KjThA2%3D%2B-Pj5rWHi12oSMYoQN3A%40mail.gmail.com<https://groups.google.com/d/msgid/geoengineering/CAJ3C-04HOfk0QwA4LLgjsf5KjThA2%3D%2B-Pj5rWHi12oSMYoQN3A%40mail.gmail.com?utm_medium=email&utm_source=footer>. The University of Edinburgh is a charitable body, registered in Scotland, with registration number SC005336. -- You received this message because you are subscribed to the Google Groups "geoengineering" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/geoengineering/PR3PR05MB7354B486D2CE3FEC9E8FD94EA78E9%40PR3PR05MB7354.eurprd05.prod.outlook.com.
