Abrupt Heinrich Stadial 1 cooling missing in Greenland oxygen isotopes
Abrupt climate changes during the last deglaciation have been well preserved in proxy records across the globe. However, one long-standing puzzle is the apparent absence of the onset of the Heinrich Stadial 1 (HS1) cold event around 18 ka in Greenland ice core oxygen isotope delta O-18 records, inco...
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ftncar:oai:drupal-site.org:articles_24506 2024-04-28T08:08:25+00:00 Abrupt Heinrich Stadial 1 cooling missing in Greenland oxygen isotopes He, Chengfei (author) Liu, Zhengyu (author) Otto-Bliesner, Bette L. (author) Brady, Esther C. (author) Zhu, Chenyu (author) Tomas, Robert (author) Buizert, Christo (author) Severinghaus, Jeffrey P. (author) 2021-06-16 https://doi.org/10.1126/sciadv.abh1007 en eng Science Advances--Sci. Adv.--2375-2548 articles:24506 doi:10.1126/sciadv.abh1007 ark:/85065/d79c71tj Copyright 2021 American Association for the Advancement of Science. article Text 2021 ftncar https://doi.org/10.1126/sciadv.abh1007 2024-04-04T17:33:50Z Abrupt climate changes during the last deglaciation have been well preserved in proxy records across the globe. However, one long-standing puzzle is the apparent absence of the onset of the Heinrich Stadial 1 (HS1) cold event around 18 ka in Greenland ice core oxygen isotope delta O-18 records, inconsistent with other proxies. Here, combining proxy records with an isotope-enabled transient deglacial simulation, we propose that a substantial HS1 cooling onset did indeed occur over the Arctic in winter. However, this cooling signal in the depleted oxygen isotopic composition is completely compensated by the enrichment because of the loss of winter precipitation in response to sea ice expansion associated with AMOC slowdown during extreme glacial climate. In contrast, the Arctic summer warmed during HS1 and YD because of increased insolation and greenhouse gases, consistent with snowline reconstructions. Our work suggests that Greenland delta O-18 may substantially underestimate temperature variability during cold glacial conditions. 1852977 Article in Journal/Newspaper Arctic Greenland Greenland ice core ice core Sea ice OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research) Science Advances 7 25 eabh1007 |
institution |
Open Polar |
collection |
OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research) |
op_collection_id |
ftncar |
language |
English |
description |
Abrupt climate changes during the last deglaciation have been well preserved in proxy records across the globe. However, one long-standing puzzle is the apparent absence of the onset of the Heinrich Stadial 1 (HS1) cold event around 18 ka in Greenland ice core oxygen isotope delta O-18 records, inconsistent with other proxies. Here, combining proxy records with an isotope-enabled transient deglacial simulation, we propose that a substantial HS1 cooling onset did indeed occur over the Arctic in winter. However, this cooling signal in the depleted oxygen isotopic composition is completely compensated by the enrichment because of the loss of winter precipitation in response to sea ice expansion associated with AMOC slowdown during extreme glacial climate. In contrast, the Arctic summer warmed during HS1 and YD because of increased insolation and greenhouse gases, consistent with snowline reconstructions. Our work suggests that Greenland delta O-18 may substantially underestimate temperature variability during cold glacial conditions. 1852977 |
author2 |
He, Chengfei (author) Liu, Zhengyu (author) Otto-Bliesner, Bette L. (author) Brady, Esther C. (author) Zhu, Chenyu (author) Tomas, Robert (author) Buizert, Christo (author) Severinghaus, Jeffrey P. (author) |
format |
Article in Journal/Newspaper |
title |
Abrupt Heinrich Stadial 1 cooling missing in Greenland oxygen isotopes |
spellingShingle |
Abrupt Heinrich Stadial 1 cooling missing in Greenland oxygen isotopes |
title_short |
Abrupt Heinrich Stadial 1 cooling missing in Greenland oxygen isotopes |
title_full |
Abrupt Heinrich Stadial 1 cooling missing in Greenland oxygen isotopes |
title_fullStr |
Abrupt Heinrich Stadial 1 cooling missing in Greenland oxygen isotopes |
title_full_unstemmed |
Abrupt Heinrich Stadial 1 cooling missing in Greenland oxygen isotopes |
title_sort |
abrupt heinrich stadial 1 cooling missing in greenland oxygen isotopes |
publishDate |
2021 |
url |
https://doi.org/10.1126/sciadv.abh1007 |
genre |
Arctic Greenland Greenland ice core ice core Sea ice |
genre_facet |
Arctic Greenland Greenland ice core ice core Sea ice |
op_relation |
Science Advances--Sci. Adv.--2375-2548 articles:24506 doi:10.1126/sciadv.abh1007 ark:/85065/d79c71tj |
op_rights |
Copyright 2021 American Association for the Advancement of Science. |
op_doi |
https://doi.org/10.1126/sciadv.abh1007 |
container_title |
Science Advances |
container_volume |
7 |
container_issue |
25 |
container_start_page |
eabh1007 |
_version_ |
1797577224550875136 |