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Examining the Mid-Pliocene Expression of the Deep Western North Pacific.

紀錄類型:	書目-語言資料,手稿 : Monograph/item
正題名/作者:	Examining the Mid-Pliocene Expression of the Deep Western North Pacific./
作者:	Cashimere, Olivia.
面頁冊數:	1 online resource (60 pages)
附註:	Source: Masters Abstracts International, Volume: 84-12.
Contained By:	Masters Abstracts International84-12.
標題:	Paleoclimate science. -
電子資源:	click for full text (PQDT)
ISBN:	9798379731007

Examining the Mid-Pliocene Expression of the Deep Western North Pacific.
Cashimere, Olivia.

Examining the Mid-Pliocene Expression of the Deep Western North Pacific. - 1 online resource (60 pages)

Source: Masters Abstracts International, Volume: 84-12.

Thesis (M.S.)--State University of New York at Binghamton, 2023.

Includes bibliographical references

The Kuroshio Current (KC) and the Kuroshio Current Extension (KCE) make up the largest western boundary current in the world. The poleward heat delivery by the KC and KCE thus plays an important role in determining storm tracks, precipitation patterns, and heat delivery across Asia, Siberia, and North America.However, research is lacking in examining the magnitude of climate change projected for how the end-of-the-century will affect this major ocean circulation system. During the mid-Pliocene (~3 Ma) global mean surface temperatures exceeded a maxima of ~2°C warmer than pre-industrial values, which coincides with estimates projected under more moderate emission scenarios for the end-of-the-century. Sustained warmth during this recent period of time is thought to promote an oceanic overturning circulation system that is different than the established glacial-interglacial variability of the past ~2.7 Ma. The different style of oceanic circulation has been considered to be a product of the contrasting environmental regimes in source regions where cold dense water masses are formed compared to modern day. One of the most understudied regions of the global ocean during the mid-Pliocene is the Northwest (NW) Pacific, despite it being the terminus of the "global ocean conveyor" and a major sink for dissolved inorganic carbon (i.e., CO2). Paleoclimatic reconstructions of the KC and KCE during the mid-Pliocene were provided hypotheses of how this circulation system will respond as a global mean. temperatures continue to increase above 2°C pre-industrial values.Ocean Drilling Program (ODP) Site 1207A provides an ideal location to examine both surface and deep ocean circulation changes in the NW western North Pacific as it currently sits in the transition zone between warm subtropical, waters to the South, and subarctic waters to the North and is positioned at a depth that is bathed by either northward flowing bottom waters or southward flowing intermediate-to-deep waters. Thus, ODP Site 1207 can provide a whole water column snapshot of major changes in surface and deep ocean circulation when considering a multi-proxy approach.Here an orbitally resolved age model is presented that allows regional comparisons between published carbon isotope records to provide a better geographical reconstruction of ocean Earth System processes. Development of a benthic δ18O record, constrained by magnetostratigraphy and biostratigraphy, allowed for alignment of the ODP 1207 record to a global compilation record commonly used for age model development. This high-resolution age model enables us to make comparisons with newly developed benthic δ13C records in order to test hypotheses concerning deep ocean circulation changes during the Pliocene. High-resolution X-ray fluorescence core scanning data provides proxy evidence of surface ocean and redox changes at depth that alludes to large-scale circulation changes operating the North Pacific during the warmer than present mid-Pliocene. Thus, these newly developed stable isotope and inorganic geochemical records provides insight into how one of the most prominent and understudied components of the oceanic circulation systems may evolve as global mean temperatures exceed 2°C pre-industrial values.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2024

Mode of access: World Wide Web

ISBN: 9798379731007Subjects--Topical Terms:

1185587
Paleoclimate science.
Subjects--Index Terms:

Mid-pliocene expressionIndex Terms--Genre/Form:

554714
Electronic books.

Examining the Mid-Pliocene Expression of the Deep Western North Pacific.
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520 $a The Kuroshio Current (KC) and the Kuroshio Current Extension (KCE) make up the largest western boundary current in the world. The poleward heat delivery by the KC and KCE thus plays an important role in determining storm tracks, precipitation patterns, and heat delivery across Asia, Siberia, and North America.However, research is lacking in examining the magnitude of climate change projected for how the end-of-the-century will affect this major ocean circulation system. During the mid-Pliocene (~3 Ma) global mean surface temperatures exceeded a maxima of ~2°C warmer than pre-industrial values, which coincides with estimates projected under more moderate emission scenarios for the end-of-the-century. Sustained warmth during this recent period of time is thought to promote an oceanic overturning circulation system that is different than the established glacial-interglacial variability of the past ~2.7 Ma. The different style of oceanic circulation has been considered to be a product of the contrasting environmental regimes in source regions where cold dense water masses are formed compared to modern day. One of the most understudied regions of the global ocean during the mid-Pliocene is the Northwest (NW) Pacific, despite it being the terminus of the "global ocean conveyor" and a major sink for dissolved inorganic carbon (i.e., CO2). Paleoclimatic reconstructions of the KC and KCE during the mid-Pliocene were provided hypotheses of how this circulation system will respond as a global mean. temperatures continue to increase above 2°C pre-industrial values.Ocean Drilling Program (ODP) Site 1207A provides an ideal location to examine both surface and deep ocean circulation changes in the NW western North Pacific as it currently sits in the transition zone between warm subtropical, waters to the South, and subarctic waters to the North and is positioned at a depth that is bathed by either northward flowing bottom waters or southward flowing intermediate-to-deep waters. Thus, ODP Site 1207 can provide a whole water column snapshot of major changes in surface and deep ocean circulation when considering a multi-proxy approach.Here an orbitally resolved age model is presented that allows regional comparisons between published carbon isotope records to provide a better geographical reconstruction of ocean Earth System processes. Development of a benthic δ18O record, constrained by magnetostratigraphy and biostratigraphy, allowed for alignment of the ODP 1207 record to a global compilation record commonly used for age model development. This high-resolution age model enables us to make comparisons with newly developed benthic δ13C records in order to test hypotheses concerning deep ocean circulation changes during the Pliocene. High-resolution X-ray fluorescence core scanning data provides proxy evidence of surface ocean and redox changes at depth that alludes to large-scale circulation changes operating the North Pacific during the warmer than present mid-Pliocene. Thus, these newly developed stable isotope and inorganic geochemical records provides insight into how one of the most prominent and understudied components of the oceanic circulation systems may evolve as global mean temperatures exceed 2°C pre-industrial values.
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