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Can solar radiation management cool earth without reducing precipitation in heavily populated and cultivated regions?

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Title
Can solar radiation management cool earth without reducing precipitation in heavily populated and cultivated regions?
Name (type = personal)
NamePart (type = family)
Gabriel
NamePart (type = given)
Corey J.
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1981-
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Corey J. Gabriel
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author
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Alan
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Alan Robock
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Advisory Committee
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chair
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Broccoli
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Anthony
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Anthony Broccoli
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Advisory Committee
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internal member
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lintner
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ben
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ben lintner
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Advisory Committee
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kravitz
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ben
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ben kravitz
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Advisory Committee
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outside member
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Rutgers University
Role
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degree grantor
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Graduate School - New Brunswick
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school
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Text
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theses
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2017
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2017-05
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2017
Place
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xx
Language
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eng
Abstract (type = abstract)
Geoengineering is the large-scale intentional manipulation of climate processes designed to reduce global temperature. Absent the implementation of an effective global mitigation strategy, it may be difficult to avoid experiencing an amount of anthropogenic global warming that would adversely impact both civilization and natural ecosystems without solar radiation management (SRM) geoengineering. One of the major issues with global warming is a possible increase in tropical precipitation over already wet tropical land regions. A major risk associated with stratospheric SRM, an intervention designed to reduce the impacts of global warming, is a reduction of tropical precipitation over land. In this thesis, I will explore the climate response to SRM with a special focus on impacts in tropical regions, particularly with regard to changes in precipitation patterns. Changes in the El NiƱo Southern Oscillation (ENSO) are either not present in Geoengineering Model Intercomparison Project (GeoMIP) G1-G4 output, or not detectable, due to the short simulation duration and to the large inherent variability of ENSO. The changes in precipitation distribution and monsoon strength relative to anthropogenic global warming or the historical climate under G1-G4 cannot be attributed to changes in ENSO. After determining that no possible marine cloud brightening scheme could be an effective method of cooling Earth without reducing tropical precipitation, in heavily populated, highly cultivated tropical regions, I developed the G4Foam experiment, which achieved significant global cooling and a large redistribution of precipitation from ocean to land. No direct forcing was applied to tropical latitudes, but G4Foam cooled the tropics by 0.6 K, while increasing precipitation in most areas, including areas that typically get less precipitation with global warming. However, the Southern Hemisphere (SH) regional forcing was, as expected, not effective in cooling Northern Hemisphere (NH) continents. In an attempt to cool the entire planet while maintaining tropical precipitation at present day levels, I combined stratospheric solar radiation management and regional ocean albedo enhancement in designing the G4SSAFoam experiment. In this experiment, 1.5 K of global mean cooling was achieved and tropical precipitation remained at or near RCP6.0 levels and slightly above G4SSA levels. However, the spatial distribution of positive and negative precipitation and precipitation minus evaporation (P-E) anomalies in the tropics was heterogeneous, with some heavily populated areas experiencing large increases, while others experience large decreases. The severe cooling of about 2 K in the SH extratropics causes a precipitation reduction of almost 6% in G4SSAFoam when compared to RCP6.0. While P-E anomalies over land in the SH are only negative in certain regions, future research would be needed to determine the full societal and ecological impact of the SH extratropical temperature and precipitation perturbations. The deployment of microbubbles in the ocean is currently not possible and significant innovation would need to occur if a need to conduct geoengineering in the manner of G4Foam arose, for example, in the event of a stratospheric solar radiation management deployment that reduced tropical precipitation to the extent that it or reduced tropical temperature.
Subject (authority = RUETD)
Topic
Atmospheric Science
Subject (authority = ETD-LCSH)
Topic
Climatic changes
Subject (authority = ETD-LCSH)
Topic
Solar radiation--Management
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Rutgers University Electronic Theses and Dissertations
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ETD_8000
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electronic resource
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application/pdf
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Extent
1 online resource (xi, 151 p. : ill.)
Note (type = degree)
Ph.D.
Note (type = bibliography)
Includes bibliographical references
Note (type = statement of responsibility)
by Corey J. Gabriel
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Title
Graduate School - New Brunswick Electronic Theses and Dissertations
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rucore19991600001
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Identifier (type = doi)
doi:10.7282/T3CF9SZG
Genre (authority = ExL-Esploro)
ETD doctoral
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Rights

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The author owns the copyright to this work.
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Name
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Gabriel
GivenName
Corey
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J.
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Permission or license
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2017-04-12 17:06:00
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corey gabriel
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Rutgers University. Graduate School - New Brunswick
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Author Agreement License
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I hereby grant to the Rutgers University Libraries and to my school the non-exclusive right to archive, reproduce and distribute my thesis or dissertation, in whole or in part, and/or my abstract, in whole or in part, in and from an electronic format, subject to the release date subsequently stipulated in this submittal form and approved by my school. I represent and stipulate that the thesis or dissertation and its abstract are my original work, that they do not infringe or violate any rights of others, and that I make these grants as the sole owner of the rights to my thesis or dissertation and its abstract. I represent that I have obtained written permissions, when necessary, from the owner(s) of each third party copyrighted matter to be included in my thesis or dissertation and will supply copies of such upon request by my school. I acknowledge that RU ETD and my school will not distribute my thesis or dissertation or its abstract if, in their reasonable judgment, they believe all such rights have not been secured. I acknowledge that I retain ownership rights to the copyright of my work. I also retain the right to use all or part of this thesis or dissertation in future works, such as articles or books.
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2017-05-31
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2017-11-30
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Access to this PDF has been restricted at the author's request. It will be publicly available after November 30th, 2017.
Copyright
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Copyright protected
Availability
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Open
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Permission or license
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