I was also similarly skeptical of the reliance upon magic clouds. I can see no way to induce such effects.
A On Wed, 22 Jul 2020, 16:28 Alan Robock ☮, <[email protected]> wrote: > Dear Andrew, > > Thanks for this, but it is only a meeting abstract. I don't understand > how a global energy balance model can produce precipitation. And I don't > understand how it would be possible to produce artificial cloud cover on > demand in specific places and at specific times. And what kind of clouds > are they? I watched the ppt presentation, but it did not answer these > questions. > > Alan > > Alan Robock, Distinguished Professor > Associate Editor, Reviews of Geophysics > Department of Environmental Sciences Phone: +1-848-932-5751 > Rutgers University E-mail: [email protected] > 14 College Farm Road http://people.envsci.rutgers.edu/robock > New Brunswick, NJ 08901-8551 USA ☮ http://twitter.com/AlanRobock > > On 7/22/2020 11:00 AM, Andrew Lockley wrote: > > > https://meetingorganizer.copernicus.org/EGU2020/EGU2020-12307.html?s=09 > > Counteracting global warming by using a locally variable Solar Radiation > Management > Davide Marchegiani and Dietmar Dommenget > Solar Radiation Management (SRM) is regarded as a tool which could > potentially mitigate or completely offset global warming by increasing > planetary albedo. However, this approach could potentially reduce > precipitation as well, as shown in the latest Intergovernmental Panel on > Climate Change (ICPP) 5th report. Thus, although SRM might weaken global > climate risks, it may enhance those in some regions. Here, using the > Globally Resolved Energy Balance (GREB) model, we present experiments > designed to completely offset the temperature and precipitation response > due to a CO2-doubling experiment (abrupt2×CO2). The main idea around which > our study is built upon is to employ a localized and seasonally varying > SRM, as opposed to the most recent Geo-Engineering experiments which just > apply a global and homogeneous one. In order to achieve such condition, we > carry out the computation by using an “artificial cloud cover”. The usage > of this localized approach allows us to globally cut down temperature > warming in the abrupt2×CO2 scenario by 99.8% (which corresponds to an > increase of 0.07 °C on a global average basis), while at the same time only > having minor changes in precipitation (0.003 mm/day on a global average > basis). To achieve this the cloud cover is increased by about 8% on a > global average. Moreover, neither temperature nor precipitation response > are exacerbated when averaged over any IPCC Special Report on Extremes > (SREX) region. Indeed, for temperatures, 90% of SREX regions averages fall > within 0.3 °C change, with all regional mean anomalies being under 0.38 °C. > Whereas, as far as precipitation is concerned, changes go up to 0.01 mm/day > for 90% of SREX regions, with all of them changing by less than 0.02 > mm/day. Similar results are achieved for seasonal variations, with Seasonal > Cycle (DJF-JJA) having no major changes in both surface temperature and > precipitation. > > How to cite: Marchegiani, D. and Dommenget, D.: Counteracting global > warming by using a locally variable Solar Radiation Management, EGU General > Assembly 2020, Online, 4–8 May 2020, EGU2020-12307, > https://doi.org/10.5194/egusphere-egu2020-12307, 2020 > -- > 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/CAJ3C-046ocCUQHhY3xKOte5kcKJdWnGSxwaWq4MvigwFpe41OQ%40mail.gmail.com > <https://groups.google.com/d/msgid/geoengineering/CAJ3C-046ocCUQHhY3xKOte5kcKJdWnGSxwaWq4MvigwFpe41OQ%40mail.gmail.com?utm_medium=email&utm_source=footer> > . > > > -- 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/CAJ3C-04ZyRqAfE8qXtGfi7eaMNCZBth4nkFMrqZ3WUt5MS4Tzg%40mail.gmail.com.
