Impacts of the North Atlantic Warming Hole in Future Climate Projections: Mean Atmospheric Circulation and the North Atlantic Jet
In future climate simulations there is a pronounced region of reduced warming in the subpolar gyre of the North Atlantic Ocean known as the North Atlantic warming hole (NAWH). This study investigates the impact of the North Atlantic warming hole on atmospheric circulation and midlatitude jets within...
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ftosti:oai:osti.gov:1612183 2023-07-30T04:05:09+02:00 Impacts of the North Atlantic Warming Hole in Future Climate Projections: Mean Atmospheric Circulation and the North Atlantic Jet Gervais, Melissa Shaman, Jeffrey Kushnir, Yochanan 2021-10-28 application/pdf http://www.osti.gov/servlets/purl/1612183 https://www.osti.gov/biblio/1612183 https://doi.org/10.1175/jcli-d-18-0647.1 unknown http://www.osti.gov/servlets/purl/1612183 https://www.osti.gov/biblio/1612183 https://doi.org/10.1175/jcli-d-18-0647.1 doi:10.1175/jcli-d-18-0647.1 54 ENVIRONMENTAL SCIENCES 37 INORGANIC ORGANIC PHYSICAL AND ANALYTICAL CHEMISTRY 2021 ftosti https://doi.org/10.1175/jcli-d-18-0647.1 2023-07-11T09:41:19Z In future climate simulations there is a pronounced region of reduced warming in the subpolar gyre of the North Atlantic Ocean known as the North Atlantic warming hole (NAWH). This study investigates the impact of the North Atlantic warming hole on atmospheric circulation and midlatitude jets within the Community Earth System Model (CESM). Specifically, a series of large-ensemble atmospheric model experiments with prescribed sea surface temperature (SST) and sea ice are conducted, in which the warming hole is either filled or deepened. Two mechanisms through which the NAWH impacts the atmosphere are identified: a linear response characterized by a shallow atmospheric cooling and increase in sea level pressure shifted slightly downstream of the SST changes, and a transient eddy forced response whereby the enhanced SST gradient produced by the NAWH leads to increased transient eddy activity that propagates vertically and enhances the midlatitude jet. The relative contributions of these two mechanisms and the details of the response are strongly dependent on the season, time period, and warming hole strength. Our results indicate that the NAWH plays an important role in midlatitude atmospheric circulation changes in CESM future climate simulations. Other/Unknown Material North Atlantic Sea ice SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) Journal of Climate 32 10 2673 2689 |
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SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) |
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54 ENVIRONMENTAL SCIENCES 37 INORGANIC ORGANIC PHYSICAL AND ANALYTICAL CHEMISTRY |
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54 ENVIRONMENTAL SCIENCES 37 INORGANIC ORGANIC PHYSICAL AND ANALYTICAL CHEMISTRY Gervais, Melissa Shaman, Jeffrey Kushnir, Yochanan Impacts of the North Atlantic Warming Hole in Future Climate Projections: Mean Atmospheric Circulation and the North Atlantic Jet |
topic_facet |
54 ENVIRONMENTAL SCIENCES 37 INORGANIC ORGANIC PHYSICAL AND ANALYTICAL CHEMISTRY |
description |
In future climate simulations there is a pronounced region of reduced warming in the subpolar gyre of the North Atlantic Ocean known as the North Atlantic warming hole (NAWH). This study investigates the impact of the North Atlantic warming hole on atmospheric circulation and midlatitude jets within the Community Earth System Model (CESM). Specifically, a series of large-ensemble atmospheric model experiments with prescribed sea surface temperature (SST) and sea ice are conducted, in which the warming hole is either filled or deepened. Two mechanisms through which the NAWH impacts the atmosphere are identified: a linear response characterized by a shallow atmospheric cooling and increase in sea level pressure shifted slightly downstream of the SST changes, and a transient eddy forced response whereby the enhanced SST gradient produced by the NAWH leads to increased transient eddy activity that propagates vertically and enhances the midlatitude jet. The relative contributions of these two mechanisms and the details of the response are strongly dependent on the season, time period, and warming hole strength. Our results indicate that the NAWH plays an important role in midlatitude atmospheric circulation changes in CESM future climate simulations. |
author |
Gervais, Melissa Shaman, Jeffrey Kushnir, Yochanan |
author_facet |
Gervais, Melissa Shaman, Jeffrey Kushnir, Yochanan |
author_sort |
Gervais, Melissa |
title |
Impacts of the North Atlantic Warming Hole in Future Climate Projections: Mean Atmospheric Circulation and the North Atlantic Jet |
title_short |
Impacts of the North Atlantic Warming Hole in Future Climate Projections: Mean Atmospheric Circulation and the North Atlantic Jet |
title_full |
Impacts of the North Atlantic Warming Hole in Future Climate Projections: Mean Atmospheric Circulation and the North Atlantic Jet |
title_fullStr |
Impacts of the North Atlantic Warming Hole in Future Climate Projections: Mean Atmospheric Circulation and the North Atlantic Jet |
title_full_unstemmed |
Impacts of the North Atlantic Warming Hole in Future Climate Projections: Mean Atmospheric Circulation and the North Atlantic Jet |
title_sort |
impacts of the north atlantic warming hole in future climate projections: mean atmospheric circulation and the north atlantic jet |
publishDate |
2021 |
url |
http://www.osti.gov/servlets/purl/1612183 https://www.osti.gov/biblio/1612183 https://doi.org/10.1175/jcli-d-18-0647.1 |
genre |
North Atlantic Sea ice |
genre_facet |
North Atlantic Sea ice |
op_relation |
http://www.osti.gov/servlets/purl/1612183 https://www.osti.gov/biblio/1612183 https://doi.org/10.1175/jcli-d-18-0647.1 doi:10.1175/jcli-d-18-0647.1 |
op_doi |
https://doi.org/10.1175/jcli-d-18-0647.1 |
container_title |
Journal of Climate |
container_volume |
32 |
container_issue |
10 |
container_start_page |
2673 |
op_container_end_page |
2689 |
_version_ |
1772816894921801728 |