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Synoptic timescale variability and tropical-extratropical interaction along the south pacific convergence zone in climate model simulations

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Title
Synoptic timescale variability and tropical-extratropical interaction along the south pacific convergence zone in climate model simulations
Name (type = personal)
NamePart (type = family)
Niznik
NamePart (type = given)
Matthew J.
NamePart (type = date)
1988-
DisplayForm
Matthew J. Niznik
Role
RoleTerm (authority = RULIB)
author
Name (type = personal)
NamePart (type = family)
Lintner
NamePart (type = given)
Benjamin R.
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Benjamin R. Lintner
Affiliation
Advisory Committee
Role
RoleTerm (authority = RULIB)
chair
Name (type = personal)
NamePart (type = family)
Broccoli
NamePart (type = given)
Anthony J.
DisplayForm
Anthony J. Broccoli
Affiliation
Advisory Committee
Role
RoleTerm (authority = RULIB)
internal member
Name (type = personal)
NamePart (type = family)
Miller
NamePart (type = given)
James R.
DisplayForm
James R. Miller
Affiliation
Advisory Committee
Role
RoleTerm (authority = RULIB)
internal member
Name (type = personal)
NamePart (type = family)
Matthews
NamePart (type = given)
Adrian J.
DisplayForm
Adrian J. Matthews
Affiliation
Advisory Committee
Role
RoleTerm (authority = RULIB)
outside member
Name (type = personal)
NamePart (type = family)
Widlansky
NamePart (type = given)
Matthew J.
DisplayForm
Matthew J. Widlansky
Affiliation
Advisory Committee
Role
RoleTerm (authority = RULIB)
outside member
Name (type = corporate)
NamePart
Rutgers University
Role
RoleTerm (authority = RULIB)
degree grantor
Name (type = corporate)
NamePart
Graduate School - New Brunswick
Role
RoleTerm (authority = RULIB)
school
TypeOfResource
Text
Genre (authority = marcgt)
theses
OriginInfo
DateCreated (qualifier = exact)
2015
DateOther (qualifier = exact); (type = degree)
2015-05
CopyrightDate (encoding = w3cdtf); (qualifier = exact)
2015
Place
PlaceTerm (type = code)
xx
Language
LanguageTerm (authority = ISO639-2b); (type = code)
eng
Abstract (type = abstract)
The South Pacific Convergence Zone (SPCZ) is simulated as too zonal a feature in current generation climate models, including those in Phase 5 of the Coupled Model Intercomparison Project (CMIP5). On synoptic timescales, the SPCZ structure is controlled both by the amount of low-level inflow from the relatively dry southeastern Pacific as well as the tropical-extratropical interaction between transient synoptic systems and the mean background state. However, the fidelity with which CMIP5 models are capable of simulating these interactions has not been previously examined. Building on the analysis of observed SPCZ-region synoptic scale variability by Lintner and Neelin (2008), composite analysis of two reanalyses and 17 CMIP5 models reveals both individual models and their ensemble mean capture patterns of wind, specific humidity, and precipitation anomalies consistent with reanalysis and observational results. To further explore the difference between weak- and strong-inflow conditions, both are instantaneously imposed in an ensemble of experiments using the Quasi-equilibrium Tropical Circulation Model 2 (QTCM2). While imposed circulation anomalies lead to observed moisture and precipitation anomalies, imposed moisture anomalies manifest a weak circulation anomaly. Thus, it appears more likely that the initiation of SPCZ shifts is dynamic in nature. Analysis of synoptic variability in the simulated subtropical SPCZ reveals that the basic mechanism of tropical-extratropical interaction is generally well simulated, with storms approaching the SPCZ along comparable trajectories to observations. However, there is a broad spread in mean precipitation and its variability across the CMIP5 ensemble. The region of mean negative zonal stretching deformation or “storm graveyard” in the upper troposphere is displaced in CMIP5 models to the northeast of its position in reanalysis data, albeit with pronounced (≈25°) inter-model longitudinal spread; SPCZ precipitation is similarly displaced and models with stronger storm graveyards show higher precipitation variability. Overall, these results further confirm that SPCZ errors are primarily related to a biased background state. Additionally, SPCZs simulated by CMIP5 models are not simply too zonal; rather, in models the subtropical SPCZ manifests a diagonal tilt similar to observations while SST biases force an overly zonal tropical SPCZ, resulting in a more discontinuous SPCZ than observed.
Subject (authority = RUETD)
Topic
Atmospheric Science
Subject (authority = ETD-LCSH)
Topic
Climatology--Mathematical models
Subject (authority = ETD-LCSH)
Topic
Climate--South Pacific Ocean
RelatedItem (type = host)
TitleInfo
Title
Rutgers University Electronic Theses and Dissertations
Identifier (type = RULIB)
ETD
Identifier
ETD_6191
PhysicalDescription
Form (authority = gmd)
electronic resource
InternetMediaType
application/pdf
InternetMediaType
text/xml
Extent
1 online resource (xix, 132 p. : ill.)
Note (type = degree)
Ph.D.
Note (type = bibliography)
Includes bibliographical references
Note (type = statement of responsibility)
by Matthew J. Niznik
RelatedItem (type = host)
TitleInfo
Title
Graduate School - New Brunswick Electronic Theses and Dissertations
Identifier (type = local)
rucore19991600001
Location
PhysicalLocation (authority = marcorg); (displayLabel = Rutgers, The State University of New Jersey)
NjNbRU
Identifier (type = doi)
doi:10.7282/T3611249
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Rights

RightsDeclaration (ID = rulibRdec0006)
The author owns the copyright to this work.
RightsHolder (type = personal)
Name
FamilyName
Niznik
GivenName
Matthew
MiddleName
J.
Role
Copyright Holder
RightsEvent
Type
Permission or license
DateTime (encoding = w3cdtf); (qualifier = exact); (point = start)
2015-02-13 21:32:34
AssociatedEntity
Name
Matthew Niznik
Role
Copyright holder
Affiliation
Rutgers University. Graduate School - New Brunswick
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License
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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.
RightsEvent
DateTime (encoding = w3cdtf); (qualifier = exact); (point = start)
2015-05-31
DateTime (encoding = w3cdtf); (qualifier = exact); (point = end)
2016-05-30
Type
Embargo
Detail
Access to this PDF has been restricted at the author's request. It will be publicly available after May 30th, 2016.
Copyright
Status
Copyright protected
Availability
Status
Open
Reason
Permission or license
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