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
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