Evaluating marine dust records as templates for optical dating of Oldest Ice
The continuous ice core record extends 800,000 years into the past, covering the period of 100,000-year glacial cycles, but not the transition from 40,000-year glacial cycles (the Mid-Pleistocene Transition, 1.2–0.7 million years ago). A primary goal of the International Partnership in Ice Core Scie...
Main Authors: | , , , |
---|---|
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Copernicus Publications
2023
|
Subjects: | |
Online Access: | https://doi.org/10.5194/egusphere-2023-1342 https://noa.gwlb.de/receive/cop_mods_00068091 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00066525/egusphere-2023-1342.pdf https://egusphere.copernicus.org/preprints/2023/egusphere-2023-1342/egusphere-2023-1342.pdf |
id |
ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00068091 |
---|---|
record_format |
openpolar |
spelling |
ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00068091 2023-09-05T13:15:14+02:00 Evaluating marine dust records as templates for optical dating of Oldest Ice Ng, Jessica Severinghaus, Jeffrey Bay, Ryan Tosi, Delia 2023-08 electronic https://doi.org/10.5194/egusphere-2023-1342 https://noa.gwlb.de/receive/cop_mods_00068091 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00066525/egusphere-2023-1342.pdf https://egusphere.copernicus.org/preprints/2023/egusphere-2023-1342/egusphere-2023-1342.pdf eng eng Copernicus Publications https://doi.org/10.5194/egusphere-2023-1342 https://noa.gwlb.de/receive/cop_mods_00068091 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00066525/egusphere-2023-1342.pdf https://egusphere.copernicus.org/preprints/2023/egusphere-2023-1342/egusphere-2023-1342.pdf https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2023 ftnonlinearchiv https://doi.org/10.5194/egusphere-2023-1342 2023-08-13T23:19:56Z The continuous ice core record extends 800,000 years into the past, covering the period of 100,000-year glacial cycles, but not the transition from 40,000-year glacial cycles (the Mid-Pleistocene Transition, 1.2–0.7 million years ago). A primary goal of the International Partnership in Ice Core Sciences is therefore to retrieve a 1.5-million-year-old continuous ice core, increasing our understanding of this major change in the climate system and thus of fundamental climate forcings and feedbacks. However, complex glacial processes, limited bedrock data, and surprisingly young basal ice in previous cores necessitate careful reconnaissance studies before extracting a full core. Ice borehole optical logging reflects the ice dust content and may be used to date ice quickly and inexpensively if a reference record is known. Here we explore the relationship between ice dust records and well-dated marine dust records from sediment cores in the southern Atlantic and Pacific Oceans, which lie along paths of dust sources to Antarctica. We evaluate how representative these records are of Antarctic dust both through the existing ice core record and during the older target age range, suggesting that a newly published 1.5 million year record from site U1537 near South America is likely the most robust predictor of the Oldest Ice dust signal. We then assess procedures for rapid dating of potential Oldest Ice sites, noting that the ability to detect dating errors is an essential feature. We emphasize that ongoing efforts to identify, recover, date, and interpret an Oldest Ice core should use care to avoid unfounded assumptions about the 40 kyr world based on the 100 kyr world. Article in Journal/Newspaper Antarc* Antarctic Antarctica ice core Niedersächsisches Online-Archiv NOA Antarctic Pacific |
institution |
Open Polar |
collection |
Niedersächsisches Online-Archiv NOA |
op_collection_id |
ftnonlinearchiv |
language |
English |
topic |
article Verlagsveröffentlichung |
spellingShingle |
article Verlagsveröffentlichung Ng, Jessica Severinghaus, Jeffrey Bay, Ryan Tosi, Delia Evaluating marine dust records as templates for optical dating of Oldest Ice |
topic_facet |
article Verlagsveröffentlichung |
description |
The continuous ice core record extends 800,000 years into the past, covering the period of 100,000-year glacial cycles, but not the transition from 40,000-year glacial cycles (the Mid-Pleistocene Transition, 1.2–0.7 million years ago). A primary goal of the International Partnership in Ice Core Sciences is therefore to retrieve a 1.5-million-year-old continuous ice core, increasing our understanding of this major change in the climate system and thus of fundamental climate forcings and feedbacks. However, complex glacial processes, limited bedrock data, and surprisingly young basal ice in previous cores necessitate careful reconnaissance studies before extracting a full core. Ice borehole optical logging reflects the ice dust content and may be used to date ice quickly and inexpensively if a reference record is known. Here we explore the relationship between ice dust records and well-dated marine dust records from sediment cores in the southern Atlantic and Pacific Oceans, which lie along paths of dust sources to Antarctica. We evaluate how representative these records are of Antarctic dust both through the existing ice core record and during the older target age range, suggesting that a newly published 1.5 million year record from site U1537 near South America is likely the most robust predictor of the Oldest Ice dust signal. We then assess procedures for rapid dating of potential Oldest Ice sites, noting that the ability to detect dating errors is an essential feature. We emphasize that ongoing efforts to identify, recover, date, and interpret an Oldest Ice core should use care to avoid unfounded assumptions about the 40 kyr world based on the 100 kyr world. |
format |
Article in Journal/Newspaper |
author |
Ng, Jessica Severinghaus, Jeffrey Bay, Ryan Tosi, Delia |
author_facet |
Ng, Jessica Severinghaus, Jeffrey Bay, Ryan Tosi, Delia |
author_sort |
Ng, Jessica |
title |
Evaluating marine dust records as templates for optical dating of Oldest Ice |
title_short |
Evaluating marine dust records as templates for optical dating of Oldest Ice |
title_full |
Evaluating marine dust records as templates for optical dating of Oldest Ice |
title_fullStr |
Evaluating marine dust records as templates for optical dating of Oldest Ice |
title_full_unstemmed |
Evaluating marine dust records as templates for optical dating of Oldest Ice |
title_sort |
evaluating marine dust records as templates for optical dating of oldest ice |
publisher |
Copernicus Publications |
publishDate |
2023 |
url |
https://doi.org/10.5194/egusphere-2023-1342 https://noa.gwlb.de/receive/cop_mods_00068091 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00066525/egusphere-2023-1342.pdf https://egusphere.copernicus.org/preprints/2023/egusphere-2023-1342/egusphere-2023-1342.pdf |
geographic |
Antarctic Pacific |
geographic_facet |
Antarctic Pacific |
genre |
Antarc* Antarctic Antarctica ice core |
genre_facet |
Antarc* Antarctic Antarctica ice core |
op_relation |
https://doi.org/10.5194/egusphere-2023-1342 https://noa.gwlb.de/receive/cop_mods_00068091 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00066525/egusphere-2023-1342.pdf https://egusphere.copernicus.org/preprints/2023/egusphere-2023-1342/egusphere-2023-1342.pdf |
op_rights |
https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/egusphere-2023-1342 |
_version_ |
1776197051804024832 |