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The significance of convective cloud microphysics for climate model simulations of rainfall in the West African Sahel at seasonal time scales

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TitleInfo
Title
The significance of convective cloud microphysics for climate model simulations of rainfall in the West African Sahel at seasonal time scales
Name (type = personal)
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Trabachino
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Lynne C.
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Lynne C. Trabachino
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author
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Miller
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Mark A
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Mark A Miller
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Advisory Committee
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chair
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Broccoli
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Anthony J
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Anthony J Broccoli
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Advisory Committee
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internal member
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Lintner
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Benjamin R
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Benjamin R Lintner
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Advisory Committee
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internal member
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Del Genio
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Anthony D
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Anthony D Del Genio
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Advisory Committee
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outside member
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Donner
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Leo J
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Leo J Donner
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Advisory Committee
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Rutgers University
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degree grantor
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Graduate School - New Brunswick
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theses
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2016
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2016-10
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2016
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xx
Language
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eng
Abstract (type = abstract)
This study uses a non-traditional method to substantiate the underlying influence of the parameterization of subgrid-scale convective processes on the capability of the latest generation of global climate models to simulate the seasonal cycle of rainfall associated with the West African monsoon and establish a direct connection between the treatment of convective rainfall and overall model performance on seasonal time scales. To establish the degree to which convective parameterizations may influence model simulations at seasonal scales more definitively, a single column of grid-scale output was extract from an emissions scenario experiment for two coupled models and compared to the observed evolution of rainfall, surface meteorology, the thermodynamic state of the atmosphere, clouds and radiation, obtained during 2006 in Niamey, Niger. Overall both models demonstrated a remarkable capability to comprehensively capture the seasonal cycle of the West African monsoon in the vicinity of Niamey. However, the results confirm that deficiencies in subgrid-scale physics can be a significant source of error with regards to the timing of simulated rainfall at seasonal scales and, in some models dominate non-local sources of error. Comparison of the performance of each model and their respective convective parameterizations indicated that the capability to simulate the seasonal cycle of rainfall in the Sahel with realistic timing appears to be more sensitive to a realistic representation of convective precipitation microphysics than to a realistic representation of the organization of convective structures. The perspective gained from this study sheds a more positive light on the present capabilities of coupled models to simulate convection in the Sahel and suggests that resolution of the long-standing disagreement in rainfall projections among different coupled models may be more within reach than previously advocated by performance evaluations based on traditional methods.
Subject (authority = RUETD)
Topic
Atmospheric Science
Subject (authority = ETD-LCSH)
Topic
Climatology--Mathematical models
Subject (authority = ETD-LCSH)
Topic
Climatic changes--Africa, West
Subject (authority = ETD-LCSH)
Topic
Rain and rainfall--Africa, West
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Title
Rutgers University Electronic Theses and Dissertations
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ETD_7524
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electronic resource
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application/pdf
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text/xml
Extent
1 online resource (xvii, 116 p. : ill.)
Note (type = degree)
Ph.D.
Note (type = bibliography)
Includes bibliographical references
Note (type = statement of responsibility)
by Lynne C. Trabachino
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Graduate School - New Brunswick Electronic Theses and Dissertations
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rucore19991600001
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NjNbRU
Identifier (type = doi)
doi:10.7282/T3BZ68CC
Genre (authority = ExL-Esploro)
ETD doctoral
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The author owns the copyright to this work.
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Trabachino
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Lynne
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C.
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Permission or license
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2016-08-31 08:24:12
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Lynne Trabachino
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Affiliation
Rutgers University. Graduate School - New Brunswick
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Author Agreement License
Detail
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.
Copyright
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Copyright protected
Availability
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Open
Reason
Permission or license
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