Tracking deep-water flow on Eirik drift over the past 160 kyr: linking deep-water changes to freshwater fluxes
This dissertation uses surface and deep ocean proxies to understand changes in North Atlantic deep-water production associated with periods of increased freshwater input throughout the Late Pleistocene and Holocene. Coring sites on Eirik Drift have long-term sedimentation rates exceeding 15 cm/kyr.,...
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ftrutgersuniv:oai:example.org:rutgers-lib:25424 2023-05-15T15:14:07+02:00 Tracking deep-water flow on Eirik drift over the past 160 kyr: linking deep-water changes to freshwater fluxes Henderson, Samuel Straker Henderson, Samuel Straker (author) Wright, James (chair) Mountain, Gregory (internal member) Miller, Kenneth (internal member) Manley, Patricia (outside member) Rutgers University Graduate School - New Brunswick 2009 xii, 160 p. : ill. electronic application/pdf http://hdl.rutgers.edu/1782.2/rucore10001600001.ETD.000051018 eng eng Rutgers University Electronic Theses and Dissertations Graduate School - New Brunswick Electronic Theses and Dissertations rucore19991600001 http://hdl.rutgers.edu/1782.2/rucore10001600001.ETD.000051018 Geological Sciences Ocean circulation--North Atlantic Ocean Fresh water--Arctic regions Paleontology--Holocene Paleoceanography--Holocene Paleoclimatology--Holocene Submarine geology Text theses 2009 ftrutgersuniv 2022-05-30T13:37:34Z This dissertation uses surface and deep ocean proxies to understand changes in North Atlantic deep-water production associated with periods of increased freshwater input throughout the Late Pleistocene and Holocene. Coring sites on Eirik Drift have long-term sedimentation rates exceeding 15 cm/kyr., allowing for paleoceanographic reconstructions on Milankovitch and millennial time scales. The transition from glacial North Atlantic Intermediate Water (gNAIW) of marine isotope chron (MIC) 2 to North Atlantic Deep Water (NADW) during the Holocene is examined in Chapter 1. Early Holocene (9000-10,500 ka), sedimentation rates in core 21GGC (3471 m) are >100 cm/kyr., indicating gNAIW winnowed upstream glacial sediments, depositing at 21GGC. Enhanced sediment deposition persisted until ~9ka when long-term rates leveled off at 40 cm/kyr., indicating NADW density had stabilized. From 8.6 to 8.2 ka, catastrophic drainage of glacial Lake Agassiz poured freshwater into the North Atlantic disrupting deep-ocean circulation. Chapter 2 focuses on the past 160 kyr at Site 1306 (2272 m) on the Eirik Drift where highest sedimentation rates occurred during MIC 2- 5d. Mean sortable silt (SS) and ?18O of N. pachyderma (s) are inversely related during this interval, indicating that changes in surface conditions above the Eirik Drift are propagated into the deep ocean. During the past 40 kyr., SS decreases are concomitant with instances of surface ocean freshening. These intervals correlate with Heinrich Events, suggesting that massive ice flows released from the continents altered deep ocean circulation. The final chapter examines deep-ocean response during Terminations 1 and 2. Higher insolation forcing across Termination 2 is postulated to promote rapid melting of continental glaciers, leaving little opportunity for continental storage of freshwater. Conversely, lower insolation across Termination 1 allowed continental ice to linger, allowing for the routing and rapid release of freshwater creating abrupt climate reversals (H1, ... Thesis Arctic NADW North Atlantic Deep Water North Atlantic RUcore - Rutgers University Community Repository Arctic Glacial Lake ENVELOPE(-129.463,-129.463,58.259,58.259) |
institution |
Open Polar |
collection |
RUcore - Rutgers University Community Repository |
op_collection_id |
ftrutgersuniv |
language |
English |
topic |
Geological Sciences Ocean circulation--North Atlantic Ocean Fresh water--Arctic regions Paleontology--Holocene Paleoceanography--Holocene Paleoclimatology--Holocene Submarine geology |
spellingShingle |
Geological Sciences Ocean circulation--North Atlantic Ocean Fresh water--Arctic regions Paleontology--Holocene Paleoceanography--Holocene Paleoclimatology--Holocene Submarine geology Henderson, Samuel Straker Tracking deep-water flow on Eirik drift over the past 160 kyr: linking deep-water changes to freshwater fluxes |
topic_facet |
Geological Sciences Ocean circulation--North Atlantic Ocean Fresh water--Arctic regions Paleontology--Holocene Paleoceanography--Holocene Paleoclimatology--Holocene Submarine geology |
description |
This dissertation uses surface and deep ocean proxies to understand changes in North Atlantic deep-water production associated with periods of increased freshwater input throughout the Late Pleistocene and Holocene. Coring sites on Eirik Drift have long-term sedimentation rates exceeding 15 cm/kyr., allowing for paleoceanographic reconstructions on Milankovitch and millennial time scales. The transition from glacial North Atlantic Intermediate Water (gNAIW) of marine isotope chron (MIC) 2 to North Atlantic Deep Water (NADW) during the Holocene is examined in Chapter 1. Early Holocene (9000-10,500 ka), sedimentation rates in core 21GGC (3471 m) are >100 cm/kyr., indicating gNAIW winnowed upstream glacial sediments, depositing at 21GGC. Enhanced sediment deposition persisted until ~9ka when long-term rates leveled off at 40 cm/kyr., indicating NADW density had stabilized. From 8.6 to 8.2 ka, catastrophic drainage of glacial Lake Agassiz poured freshwater into the North Atlantic disrupting deep-ocean circulation. Chapter 2 focuses on the past 160 kyr at Site 1306 (2272 m) on the Eirik Drift where highest sedimentation rates occurred during MIC 2- 5d. Mean sortable silt (SS) and ?18O of N. pachyderma (s) are inversely related during this interval, indicating that changes in surface conditions above the Eirik Drift are propagated into the deep ocean. During the past 40 kyr., SS decreases are concomitant with instances of surface ocean freshening. These intervals correlate with Heinrich Events, suggesting that massive ice flows released from the continents altered deep ocean circulation. The final chapter examines deep-ocean response during Terminations 1 and 2. Higher insolation forcing across Termination 2 is postulated to promote rapid melting of continental glaciers, leaving little opportunity for continental storage of freshwater. Conversely, lower insolation across Termination 1 allowed continental ice to linger, allowing for the routing and rapid release of freshwater creating abrupt climate reversals (H1, ... |
author2 |
Henderson, Samuel Straker (author) Wright, James (chair) Mountain, Gregory (internal member) Miller, Kenneth (internal member) Manley, Patricia (outside member) Rutgers University Graduate School - New Brunswick |
format |
Thesis |
author |
Henderson, Samuel Straker |
author_facet |
Henderson, Samuel Straker |
author_sort |
Henderson, Samuel Straker |
title |
Tracking deep-water flow on Eirik drift over the past 160 kyr: linking deep-water changes to freshwater fluxes |
title_short |
Tracking deep-water flow on Eirik drift over the past 160 kyr: linking deep-water changes to freshwater fluxes |
title_full |
Tracking deep-water flow on Eirik drift over the past 160 kyr: linking deep-water changes to freshwater fluxes |
title_fullStr |
Tracking deep-water flow on Eirik drift over the past 160 kyr: linking deep-water changes to freshwater fluxes |
title_full_unstemmed |
Tracking deep-water flow on Eirik drift over the past 160 kyr: linking deep-water changes to freshwater fluxes |
title_sort |
tracking deep-water flow on eirik drift over the past 160 kyr: linking deep-water changes to freshwater fluxes |
publishDate |
2009 |
url |
http://hdl.rutgers.edu/1782.2/rucore10001600001.ETD.000051018 |
long_lat |
ENVELOPE(-129.463,-129.463,58.259,58.259) |
geographic |
Arctic Glacial Lake |
geographic_facet |
Arctic Glacial Lake |
genre |
Arctic NADW North Atlantic Deep Water North Atlantic |
genre_facet |
Arctic NADW North Atlantic Deep Water North Atlantic |
op_relation |
Rutgers University Electronic Theses and Dissertations Graduate School - New Brunswick Electronic Theses and Dissertations rucore19991600001 http://hdl.rutgers.edu/1782.2/rucore10001600001.ETD.000051018 |
_version_ |
1766344616910520320 |