Using CCSM3 to simulate climate changes caused by the 8.2ka meltwater pulse
During abrupt climate changes, the climate system is forced across some threshold, causing evolution to a new, persistent state. Studies of abrupt climate changes are necessary to understand how these changes are transferred globally and to gain insight on future climate change. In this research, we...
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ftdatacite:10.5065/3dmj-qx19 2023-05-15T16:35:30+02:00 Using CCSM3 to simulate climate changes caused by the 8.2ka meltwater pulse Burt, Melissa Morrill, Carrie Wiedinmyer, Christine 2005 https://dx.doi.org/10.5065/3dmj-qx19 https://opensky.ucar.edu/islandora/object/manuscripts:453 unknown University Corporation For Atmospheric Research (UCAR) manuscript Text article-journal ScholarlyArticle 2005 ftdatacite https://doi.org/10.5065/3dmj-qx19 2021-11-05T12:55:41Z During abrupt climate changes, the climate system is forced across some threshold, causing evolution to a new, persistent state. Studies of abrupt climate changes are necessary to understand how these changes are transferred globally and to gain insight on future climate change. In this research, we simulated an abrupt climate change at 8.2ka (8200 years ago) using the Community Climate System Model (CCSM) and focusing specifically on the global response of temperature and precipitation. This abrupt change was believed to have been caused by a massive amount of freshwater entering the Labrador Sea from a glacial lake near Hudson Bay. Previous simulations of this event used climate models of intermediate complexity or present-day boundary conditions for greenhouse gases and insolation. In this research, we used boundary conditions from 8.2 ka and a more comprehensive coupled climate model to improve the accuracy of the simulation. We found significant global changes, annually and seasonally, in temperature and precipitation. The average annual global temperature before the freshwater perturbation was 12.1 °C and after the hosing was 10.7 °C, corresponding to a −1.3 °C change. Globally, the annual precipitation change was −0.08 mm day⁻¹. T-tests indicate that these changes, globally and regionally, were statistically significant at the 95% confidence level. These changes occurred in part due to a slowdown of the Atlantic meridional overturning (thermohaline) circulation and the resulting increase in the amount of sea ice in the North Atlantic. This, in turn, increased the Earth's albedo and the Earth absorbed less incoming solar radiation. Text Hudson Bay Labrador Sea North Atlantic Sea ice DataCite Metadata Store (German National Library of Science and Technology) Glacial Lake ENVELOPE(-129.463,-129.463,58.259,58.259) Hudson Hudson Bay |
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DataCite Metadata Store (German National Library of Science and Technology) |
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During abrupt climate changes, the climate system is forced across some threshold, causing evolution to a new, persistent state. Studies of abrupt climate changes are necessary to understand how these changes are transferred globally and to gain insight on future climate change. In this research, we simulated an abrupt climate change at 8.2ka (8200 years ago) using the Community Climate System Model (CCSM) and focusing specifically on the global response of temperature and precipitation. This abrupt change was believed to have been caused by a massive amount of freshwater entering the Labrador Sea from a glacial lake near Hudson Bay. Previous simulations of this event used climate models of intermediate complexity or present-day boundary conditions for greenhouse gases and insolation. In this research, we used boundary conditions from 8.2 ka and a more comprehensive coupled climate model to improve the accuracy of the simulation. We found significant global changes, annually and seasonally, in temperature and precipitation. The average annual global temperature before the freshwater perturbation was 12.1 °C and after the hosing was 10.7 °C, corresponding to a −1.3 °C change. Globally, the annual precipitation change was −0.08 mm day⁻¹. T-tests indicate that these changes, globally and regionally, were statistically significant at the 95% confidence level. These changes occurred in part due to a slowdown of the Atlantic meridional overturning (thermohaline) circulation and the resulting increase in the amount of sea ice in the North Atlantic. This, in turn, increased the Earth's albedo and the Earth absorbed less incoming solar radiation. |
format |
Text |
author |
Burt, Melissa Morrill, Carrie Wiedinmyer, Christine |
spellingShingle |
Burt, Melissa Morrill, Carrie Wiedinmyer, Christine Using CCSM3 to simulate climate changes caused by the 8.2ka meltwater pulse |
author_facet |
Burt, Melissa Morrill, Carrie Wiedinmyer, Christine |
author_sort |
Burt, Melissa |
title |
Using CCSM3 to simulate climate changes caused by the 8.2ka meltwater pulse |
title_short |
Using CCSM3 to simulate climate changes caused by the 8.2ka meltwater pulse |
title_full |
Using CCSM3 to simulate climate changes caused by the 8.2ka meltwater pulse |
title_fullStr |
Using CCSM3 to simulate climate changes caused by the 8.2ka meltwater pulse |
title_full_unstemmed |
Using CCSM3 to simulate climate changes caused by the 8.2ka meltwater pulse |
title_sort |
using ccsm3 to simulate climate changes caused by the 8.2ka meltwater pulse |
publisher |
University Corporation For Atmospheric Research (UCAR) |
publishDate |
2005 |
url |
https://dx.doi.org/10.5065/3dmj-qx19 https://opensky.ucar.edu/islandora/object/manuscripts:453 |
long_lat |
ENVELOPE(-129.463,-129.463,58.259,58.259) |
geographic |
Glacial Lake Hudson Hudson Bay |
geographic_facet |
Glacial Lake Hudson Hudson Bay |
genre |
Hudson Bay Labrador Sea North Atlantic Sea ice |
genre_facet |
Hudson Bay Labrador Sea North Atlantic Sea ice |
op_doi |
https://doi.org/10.5065/3dmj-qx19 |
_version_ |
1766025730541486080 |