Links between Climate Sensitivity and the Large-Scale Atmospheric Circulation in a Simple General Circulation Model
Thermodynamical and dynamical aspects of the climate system response to anthropogenic forcing are often considered in two distinct frameworks: the former in the context of the forcing–feedback framework, and the latter in the context of eddy–mean flow feedbacks and large-scale thermodynamic constrai...
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Veröffentlicht in: | Journal of climate 2022-08, Vol.35 (15), p.5119-5136 |
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description | Thermodynamical and dynamical aspects of the climate system response to anthropogenic forcing are often considered in two distinct frameworks: the former in the context of the forcing–feedback framework, and the latter in the context of eddy–mean flow feedbacks and large-scale thermodynamic constraints. Here we use experiments with the dynamical core of a general circulation model (GCM) to provide insights into the relationships between these two frameworks. We first demonstrate that the climate feedbacks and climate sensitivity in a dynamical core model are determined by its prescribed thermal relaxation time scales. We then perform two experiments: one that explores the relationships between the thermal relaxation time scale and the climatological circulation, and a second that explores the relationships between the thermal relaxation time scale and the circulation response to a global warming–like forcing perturbation. The results indicate that shorter relaxation time scales (i.e., lower climate sensitivities in the context of a dynamical core model) are associated with 1) a more vigorous large-scale circulation, including increased thermal diffusivity and stronger and more poleward storm tracks and eddy-driven jets, and 2) a weaker poleward displacement of the storm tracks and eddy-driven jets in response to the global warming–like forcing perturbation. Interestingly, the circulation response to the forcing perturbation effectively disappears when the thermal relaxation time scales are spatially uniform, suggesting that the circulation response to homogeneous forcing requires spatial inhomogeneities in the local feedback parameter. Implications for anticipating the circulation response to global warming and thermodynamic constraints on the circulation are discussed. |
doi_str_mv | 10.1175/JCLI-D-21-0320.1 |
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B. ; Thompson, David W. J. ; Birner, Thomas</creator><creatorcontrib>Davis, Luke L. B. ; Thompson, David W. J. ; Birner, Thomas</creatorcontrib><description>Thermodynamical and dynamical aspects of the climate system response to anthropogenic forcing are often considered in two distinct frameworks: the former in the context of the forcing–feedback framework, and the latter in the context of eddy–mean flow feedbacks and large-scale thermodynamic constraints. Here we use experiments with the dynamical core of a general circulation model (GCM) to provide insights into the relationships between these two frameworks. We first demonstrate that the climate feedbacks and climate sensitivity in a dynamical core model are determined by its prescribed thermal relaxation time scales. We then perform two experiments: one that explores the relationships between the thermal relaxation time scale and the climatological circulation, and a second that explores the relationships between the thermal relaxation time scale and the circulation response to a global warming–like forcing perturbation. The results indicate that shorter relaxation time scales (i.e., lower climate sensitivities in the context of a dynamical core model) are associated with 1) a more vigorous large-scale circulation, including increased thermal diffusivity and stronger and more poleward storm tracks and eddy-driven jets, and 2) a weaker poleward displacement of the storm tracks and eddy-driven jets in response to the global warming–like forcing perturbation. Interestingly, the circulation response to the forcing perturbation effectively disappears when the thermal relaxation time scales are spatially uniform, suggesting that the circulation response to homogeneous forcing requires spatial inhomogeneities in the local feedback parameter. Implications for anticipating the circulation response to global warming and thermodynamic constraints on the circulation are discussed.</description><identifier>ISSN: 0894-8755</identifier><identifier>EISSN: 1520-0442</identifier><identifier>DOI: 10.1175/JCLI-D-21-0320.1</identifier><language>eng</language><publisher>Boston: American Meteorological Society</publisher><subject>Anthropogenic factors ; Atmospheric circulation ; Circulation ; Climate ; Climate change ; Climate feedback ; Climate sensitivity ; Climate system ; Context ; Feedback ; Frameworks ; General circulation models ; Global warming ; Modelling ; Perturbation ; Relaxation time ; Sensitivity ; Storm tracks ; Storms ; Thermal circulation ; Thermal diffusivity ; Thermal relaxation ; Thermodynamics ; Time ; Vortices</subject><ispartof>Journal of climate, 2022-08, Vol.35 (15), p.5119-5136</ispartof><rights>Copyright American Meteorological Society Aug 2022</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><cites>FETCH-LOGICAL-c224t-a96b1b959e8b15aa33ff86a4bec30da358e9d80b6a7a3e4bdc070cb42d9b231e3</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,780,784,3681,27924,27925</link.rule.ids></links><search><creatorcontrib>Davis, Luke L. B.</creatorcontrib><creatorcontrib>Thompson, David W. J.</creatorcontrib><creatorcontrib>Birner, Thomas</creatorcontrib><title>Links between Climate Sensitivity and the Large-Scale Atmospheric Circulation in a Simple General Circulation Model</title><title>Journal of climate</title><description>Thermodynamical and dynamical aspects of the climate system response to anthropogenic forcing are often considered in two distinct frameworks: the former in the context of the forcing–feedback framework, and the latter in the context of eddy–mean flow feedbacks and large-scale thermodynamic constraints. Here we use experiments with the dynamical core of a general circulation model (GCM) to provide insights into the relationships between these two frameworks. We first demonstrate that the climate feedbacks and climate sensitivity in a dynamical core model are determined by its prescribed thermal relaxation time scales. We then perform two experiments: one that explores the relationships between the thermal relaxation time scale and the climatological circulation, and a second that explores the relationships between the thermal relaxation time scale and the circulation response to a global warming–like forcing perturbation. The results indicate that shorter relaxation time scales (i.e., lower climate sensitivities in the context of a dynamical core model) are associated with 1) a more vigorous large-scale circulation, including increased thermal diffusivity and stronger and more poleward storm tracks and eddy-driven jets, and 2) a weaker poleward displacement of the storm tracks and eddy-driven jets in response to the global warming–like forcing perturbation. Interestingly, the circulation response to the forcing perturbation effectively disappears when the thermal relaxation time scales are spatially uniform, suggesting that the circulation response to homogeneous forcing requires spatial inhomogeneities in the local feedback parameter. Implications for anticipating the circulation response to global warming and thermodynamic constraints on the circulation are discussed.</description><subject>Anthropogenic factors</subject><subject>Atmospheric circulation</subject><subject>Circulation</subject><subject>Climate</subject><subject>Climate change</subject><subject>Climate feedback</subject><subject>Climate sensitivity</subject><subject>Climate system</subject><subject>Context</subject><subject>Feedback</subject><subject>Frameworks</subject><subject>General circulation models</subject><subject>Global warming</subject><subject>Modelling</subject><subject>Perturbation</subject><subject>Relaxation time</subject><subject>Sensitivity</subject><subject>Storm tracks</subject><subject>Storms</subject><subject>Thermal circulation</subject><subject>Thermal diffusivity</subject><subject>Thermal relaxation</subject><subject>Thermodynamics</subject><subject>Time</subject><subject>Vortices</subject><issn>0894-8755</issn><issn>1520-0442</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2022</creationdate><recordtype>article</recordtype><recordid>eNpVkDtPwzAUhS0EEqWwM1piNvgR5zFWAUpREENhtmznhrqkTrFdUP89qcrCdKVzP50jfQhdM3rLWCHvnutmQe4JZ4QKPmYnaMIkp4RmGT9FE1pWGSkLKc_RRYxrShnPKZ2g2Dj_GbGB9APgcd27jU6Al-CjS-7bpT3WvsVpBbjR4QPI0uoe8CxthrhdQXAW1y7YXa-TGzx2Hmu8dJvtyMzBQ9D9v__L0EJ_ic463Ue4-rtT9P748FY_keZ1vqhnDbGcZ4noKjfMVLKC0jCptRBdV-Y6M2AFbbWQJVRtSU2uCy0gM62lBbUm421luGAgpujm2LsNw9cOYlLrYRf8OKl4XvFc5rIqRooeKRuGGAN0ahtGCWGvGFUHteqgVt0rztRBrWLiF_xQbfg</recordid><startdate>20220801</startdate><enddate>20220801</enddate><creator>Davis, Luke L. B.</creator><creator>Thompson, David W. J.</creator><creator>Birner, Thomas</creator><general>American Meteorological Society</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7QH</scope><scope>7TG</scope><scope>7UA</scope><scope>C1K</scope><scope>F1W</scope><scope>H96</scope><scope>KL.</scope><scope>L.G</scope></search><sort><creationdate>20220801</creationdate><title>Links between Climate Sensitivity and the Large-Scale Atmospheric Circulation in a Simple General Circulation Model</title><author>Davis, Luke L. B. ; Thompson, David W. 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B.</creatorcontrib><creatorcontrib>Thompson, David W. J.</creatorcontrib><creatorcontrib>Birner, Thomas</creatorcontrib><collection>CrossRef</collection><collection>Aqualine</collection><collection>Meteorological & Geoastrophysical Abstracts</collection><collection>Water Resources Abstracts</collection><collection>Environmental Sciences and Pollution Management</collection><collection>ASFA: Aquatic Sciences and Fisheries Abstracts</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) 2: Ocean Technology, Policy & Non-Living Resources</collection><collection>Meteorological & Geoastrophysical Abstracts - Academic</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) Professional</collection><jtitle>Journal of climate</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Davis, Luke L. B.</au><au>Thompson, David W. J.</au><au>Birner, Thomas</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Links between Climate Sensitivity and the Large-Scale Atmospheric Circulation in a Simple General Circulation Model</atitle><jtitle>Journal of climate</jtitle><date>2022-08-01</date><risdate>2022</risdate><volume>35</volume><issue>15</issue><spage>5119</spage><epage>5136</epage><pages>5119-5136</pages><issn>0894-8755</issn><eissn>1520-0442</eissn><abstract>Thermodynamical and dynamical aspects of the climate system response to anthropogenic forcing are often considered in two distinct frameworks: the former in the context of the forcing–feedback framework, and the latter in the context of eddy–mean flow feedbacks and large-scale thermodynamic constraints. Here we use experiments with the dynamical core of a general circulation model (GCM) to provide insights into the relationships between these two frameworks. We first demonstrate that the climate feedbacks and climate sensitivity in a dynamical core model are determined by its prescribed thermal relaxation time scales. We then perform two experiments: one that explores the relationships between the thermal relaxation time scale and the climatological circulation, and a second that explores the relationships between the thermal relaxation time scale and the circulation response to a global warming–like forcing perturbation. The results indicate that shorter relaxation time scales (i.e., lower climate sensitivities in the context of a dynamical core model) are associated with 1) a more vigorous large-scale circulation, including increased thermal diffusivity and stronger and more poleward storm tracks and eddy-driven jets, and 2) a weaker poleward displacement of the storm tracks and eddy-driven jets in response to the global warming–like forcing perturbation. Interestingly, the circulation response to the forcing perturbation effectively disappears when the thermal relaxation time scales are spatially uniform, suggesting that the circulation response to homogeneous forcing requires spatial inhomogeneities in the local feedback parameter. Implications for anticipating the circulation response to global warming and thermodynamic constraints on the circulation are discussed.</abstract><cop>Boston</cop><pub>American Meteorological Society</pub><doi>10.1175/JCLI-D-21-0320.1</doi><tpages>18</tpages></addata></record> |
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subjects | Anthropogenic factors Atmospheric circulation Circulation Climate Climate change Climate feedback Climate sensitivity Climate system Context Feedback Frameworks General circulation models Global warming Modelling Perturbation Relaxation time Sensitivity Storm tracks Storms Thermal circulation Thermal diffusivity Thermal relaxation Thermodynamics Time Vortices |
title | Links between Climate Sensitivity and the Large-Scale Atmospheric Circulation in a Simple General Circulation Model |
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