The effects of the 8.2 ka event on the ITCZ in the tropical Atlantic
The 8.2 ka event, which occurred 8200 years before present, was a period of abrupt cooling that is recorded in multiple proxy records across the Northern Hemisphere. During this event, a cooling of 3.3°C ± 1.1°C, was estimated from Greenland ice cores and lasted about 150 years. Prior to the 8.2 ka...
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ftncar:oai:drupal-site.org:manuscripts_617 2023-05-15T16:28:21+02:00 The effects of the 8.2 ka event on the ITCZ in the tropical Atlantic Burger, Matthew (author) Hauser, Rachel (contributor) Morrill, Carrie (contributor) Wagner, Amy (contributor) Behler, Tom (contributor) Pauzauskie, Dana (contributor) 2010-08-04 application/pdf http://nldr.library.ucar.edu/repository/collections/SOARS-000-000-000-212 https://doi.org/10.5065/9bjj-7t73 en eng SOARS Earth, Wind, Sea, and Sky: Protégé Abstracts 2010--10.5065/jqeq-np75 Copyright Author(s). This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License. CC-BY-NC Text manuscript 2010 ftncar https://doi.org/10.5065/9bjj-7t73 2022-08-09T17:33:09Z The 8.2 ka event, which occurred 8200 years before present, was a period of abrupt cooling that is recorded in multiple proxy records across the Northern Hemisphere. During this event, a cooling of 3.3°C ± 1.1°C, was estimated from Greenland ice cores and lasted about 150 years. Prior to the 8.2 ka event, the climate of the northern latitudes of the North Atlantic was similar to that of today. It is hypothesized that the 8.2 ka event was caused by release of fresh water from the proglacial Lake Agassiz into the Labrador Sea and North Atlantic Ocean. This fresh water flowed into the main subduction area of the North Atlantic. Density differences between the fresh and saline waters caused the thermohaline circulation to slow down, resulting in cooler surface temperatures over Greenland. While much of the proxy evidence for the 8.2 ka event is from the region surrounding the North Atlantic basin, recent evidence studies suggest impacts from the event extended beyond this region. This paper will consider the effects of the 8.2 ka event on the Intertropical Convergence Zone (ITCZ). Published studies on lake and ocean sediment cores and cave speleothems were considered. In addition, these proxy data were compared to NCAR CCSM3 model simulations of the 8.2 ka event to assess model accuracy. Study results indicate a southward shift of the ITCZ around 8.2 ka. The comparison between the 8.2 ka climate model simulations and the proxy data largely agree with model results, diverging most from the proxy data from the equator. Manuscript Greenland Greenland ice cores Labrador Sea North Atlantic OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research) Greenland |
institution |
Open Polar |
collection |
OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research) |
op_collection_id |
ftncar |
language |
English |
description |
The 8.2 ka event, which occurred 8200 years before present, was a period of abrupt cooling that is recorded in multiple proxy records across the Northern Hemisphere. During this event, a cooling of 3.3°C ± 1.1°C, was estimated from Greenland ice cores and lasted about 150 years. Prior to the 8.2 ka event, the climate of the northern latitudes of the North Atlantic was similar to that of today. It is hypothesized that the 8.2 ka event was caused by release of fresh water from the proglacial Lake Agassiz into the Labrador Sea and North Atlantic Ocean. This fresh water flowed into the main subduction area of the North Atlantic. Density differences between the fresh and saline waters caused the thermohaline circulation to slow down, resulting in cooler surface temperatures over Greenland. While much of the proxy evidence for the 8.2 ka event is from the region surrounding the North Atlantic basin, recent evidence studies suggest impacts from the event extended beyond this region. This paper will consider the effects of the 8.2 ka event on the Intertropical Convergence Zone (ITCZ). Published studies on lake and ocean sediment cores and cave speleothems were considered. In addition, these proxy data were compared to NCAR CCSM3 model simulations of the 8.2 ka event to assess model accuracy. Study results indicate a southward shift of the ITCZ around 8.2 ka. The comparison between the 8.2 ka climate model simulations and the proxy data largely agree with model results, diverging most from the proxy data from the equator. |
author2 |
Burger, Matthew (author) Hauser, Rachel (contributor) Morrill, Carrie (contributor) Wagner, Amy (contributor) Behler, Tom (contributor) Pauzauskie, Dana (contributor) |
format |
Manuscript |
title |
The effects of the 8.2 ka event on the ITCZ in the tropical Atlantic |
spellingShingle |
The effects of the 8.2 ka event on the ITCZ in the tropical Atlantic |
title_short |
The effects of the 8.2 ka event on the ITCZ in the tropical Atlantic |
title_full |
The effects of the 8.2 ka event on the ITCZ in the tropical Atlantic |
title_fullStr |
The effects of the 8.2 ka event on the ITCZ in the tropical Atlantic |
title_full_unstemmed |
The effects of the 8.2 ka event on the ITCZ in the tropical Atlantic |
title_sort |
effects of the 8.2 ka event on the itcz in the tropical atlantic |
publishDate |
2010 |
url |
http://nldr.library.ucar.edu/repository/collections/SOARS-000-000-000-212 https://doi.org/10.5065/9bjj-7t73 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Greenland ice cores Labrador Sea North Atlantic |
genre_facet |
Greenland Greenland ice cores Labrador Sea North Atlantic |
op_relation |
SOARS Earth, Wind, Sea, and Sky: Protégé Abstracts 2010--10.5065/jqeq-np75 |
op_rights |
Copyright Author(s). This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License. |
op_rightsnorm |
CC-BY-NC |
op_doi |
https://doi.org/10.5065/9bjj-7t73 |
_version_ |
1766017991326040064 |