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A multi-proxy look at deglacial southwest Pacific Ocean sea surface temperature and thermocline source water changes
Descriptive
TitleInfo
Title
A multi-proxy look at deglacial southwest Pacific Ocean sea surface temperature and thermocline source water changes
Name
(type = personal)
NamePart
(type = family)
Schiraldi
NamePart
(type = given)
Benedetto
NamePart
(type = date)
1988-
DisplayForm
Benedetto Schiraldi Jr
Role
RoleTerm
(authority = RULIB)
author
Name
(type = personal)
NamePart
(type = family)
Sikes
NamePart
(type = given)
Elisabeth L
DisplayForm
Elisabeth L Sikes
Affiliation
Advisory Committee
Role
RoleTerm
(authority = RULIB)
chair
Name
(type = personal)
NamePart
(type = family)
Wright
NamePart
(type = given)
James D
DisplayForm
James D Wright
Affiliation
Advisory Committee
Role
RoleTerm
(authority = RULIB)
internal member
Name
(type = personal)
NamePart
(type = family)
Rosenthal
NamePart
(type = given)
Yair
DisplayForm
Yair Rosenthal
Affiliation
Advisory Committee
Role
RoleTerm
(authority = RULIB)
internal 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)
2013
DateOther
(qualifier = exact);
(type = degree)
2013-05
Place
PlaceTerm
(type = code)
xx
Language
LanguageTerm
(authority = ISO639-2b);
(type = code)
eng
Abstract
(type = abstract)
Glacial-interglacial changes in global and regional temperature have been linked to changes in insolation, winds, and ocean circulation. This study reconstructs sea surface temperature (SST) and source water provenance across the last deglaciation (~30-5 kyr BP) in five sediment cores in the Bay of Plenty, New Zealand and places these in a regional context by comparing these results to previously published work.
SST reconstructions from Mg/Ca ratios in the planktonic foraminifera
Globogerina bulloides and alkenones (Ú) track different seasons’ SST spring and summer, respectively. During the last glacial maximum (LGM, 26-22 kyr BP), summer SSTs average 16.4°C while spring SSTs were 13.6; about 4°C cooler than modern. The seasons track well with each other and maintain a constant offset of 3.3-2.8°C as temperatures increase into the Holocene, peaking at 21.7°C for summer and 18.4°C for spring. Comparison to model reconstructions of local insolation yielded correlation to winter insolation from the LGM (~26 kyr BP) to the Antarctic Cold Reversal ACR (~14.1 kyr BP) after which SSTs correlate well to their respective seasonal insolation. Comparison of this study’s temperatures to published SSTs indicate that deglacial warming of subtropical waters differ from subantarctic waters that warmed later and by 2°C more than subtropical waters.
δ18O and δ13C from planktonic foraminifera G. bulloides and Globorotalia inflate were used to reconstruct δ18O of seawater (δ18Osw) and track source water provenance. In the LGM, depleted δ18OSW averaging 0.2‰, and enriched δ13C ranging between -0.4-0.1‰ indicate shallow water masses had a strong local Southern Ocean component. A step change occurs at 20.1 kyr BP where δ13C depletes to -1.3‰ that suggests a deglacial shift in shallow subsurface water mass source location to a distal subtropical component likely sourcing through the equatorial Pacific that persists into the Holocene. A regional comparison indicates numerous switches between distal-subtropical and proximal- subantarctic influences during the early deglaciation. This ends at the ACR, which figures as a tipping point for stabilization and onset of modern circulation.
SST reconstructions from Mg/Ca ratios in the planktonic foraminifera
Globogerina bulloides and alkenones (Ú) track different seasons’ SST spring and summer, respectively. During the last glacial maximum (LGM, 26-22 kyr BP), summer SSTs average 16.4°C while spring SSTs were 13.6; about 4°C cooler than modern. The seasons track well with each other and maintain a constant offset of 3.3-2.8°C as temperatures increase into the Holocene, peaking at 21.7°C for summer and 18.4°C for spring. Comparison to model reconstructions of local insolation yielded correlation to winter insolation from the LGM (~26 kyr BP) to the Antarctic Cold Reversal ACR (~14.1 kyr BP) after which SSTs correlate well to their respective seasonal insolation. Comparison of this study’s temperatures to published SSTs indicate that deglacial warming of subtropical waters differ from subantarctic waters that warmed later and by 2°C more than subtropical waters.
δ18O and δ13C from planktonic foraminifera G. bulloides and Globorotalia inflate were used to reconstruct δ18O of seawater (δ18Osw) and track source water provenance. In the LGM, depleted δ18OSW averaging 0.2‰, and enriched δ13C ranging between -0.4-0.1‰ indicate shallow water masses had a strong local Southern Ocean component. A step change occurs at 20.1 kyr BP where δ13C depletes to -1.3‰ that suggests a deglacial shift in shallow subsurface water mass source location to a distal subtropical component likely sourcing through the equatorial Pacific that persists into the Holocene. A regional comparison indicates numerous switches between distal-subtropical and proximal- subantarctic influences during the early deglaciation. This ends at the ACR, which figures as a tipping point for stabilization and onset of modern circulation.
Subject
(authority = RUETD)
Topic
Oceanography
RelatedItem
(type = host)
TitleInfo
Title
Rutgers University Electronic Theses and Dissertations
Identifier
(type = RULIB)
ETD
Identifier
ETD_4592
PhysicalDescription
Form
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electronic resource
InternetMediaType
application/pdf
InternetMediaType
text/xml
Extent
xx, 136 p. : ill.
Note
(type = degree)
M.S.
Note
(type = bibliography)
Includes bibliographical references
Note
(type = statement of responsibility)
by Benedetto Schiraldi Jr.
Subject
(authority = ETD-LCSH)
Topic
Paleoclimatology--New Zealand--Bay of Plenty (Region)
Subject
(authority = ETD-LCSH)
Topic
Paleoceanography--New Zealand--Bay of Plenty (Region)
Subject
(authority = ETD-LCSH)
Topic
Climatic changes--New Zealand--Bay of Plenty (Region)
Subject
(authority = ETD-LCSH)
Topic
Ocean temperature--New Zealand--Bay of Plenty (Region)
Identifier
(type = hdl)
http://hdl.rutgers.edu/1782.1/rucore10001600001.ETD.000069044
RelatedItem
(type = host)
TitleInfo
Title
Graduate School - New Brunswick Electronic Theses and Dissertations
Identifier
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rucore19991600001
Location
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(displayLabel = Rutgers, The State University of New Jersey)
NjNbRU
Identifier
(type = doi)
doi:10.7282/T30G3HR4
Genre
(authority = ExL-Esploro)
ETD graduate
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Rights
RightsDeclaration
(ID = rulibRdec0006)
The author owns the copyright to this work.
RightsHolder
(type = personal)
Name
FamilyName
Schiraldi Jr
GivenName
Benedetto
Role
Copyright Holder
RightsEvent
Type
Permission or license
DateTime
(encoding = w3cdtf);
(qualifier = exact);
(point = start)
2013-04-06 20:53:31
AssociatedEntity
Name
Benedetto Schiraldi Jr
Role
Copyright holder
Affiliation
Rutgers University. Graduate School - New Brunswick
AssociatedObject
Type
License
Name
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.
RightsEvent
DateTime
(encoding = w3cdtf);
(qualifier = exact);
(point = start)
2013-05-31
DateTime
(encoding = w3cdtf);
(qualifier = exact);
(point = end)
2013-11-30
Type
Embargo
Detail
Access to this PDF has been restricted at the author's request. It will be publicly available after November 30th, 2013.
Copyright
Status
Copyright protected
Availability
Status
Open
Reason
Permission or license
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Technical
RULTechMD
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ContentModel
ETD
OperatingSystem
(VERSION = 5.1)
windows xp
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