Climate sensitivity in the Anthropocene
Climate sensitivity in its most basic form is defined as the equilibrium change in global surface temperature that occurs in response to a climate forcing, or externally imposed perturbation of the planetary energy balance. Within this general definition, several specific forms of climate sensitivit...
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ftdatacite:10.7916/d8hx1c38 2023-05-15T16:40:29+02:00 Climate sensitivity in the Anthropocene Previdi, Michael Liepert, B. G. Peteet, Dorothy M. Hansen, James E. Beerling, D. J. Broccoli, A. J. Frolking, S. Galloway, J. N. Heimann, M. Le Quéré, C. Levitus, S. Ramaswamy, V. 2013 https://dx.doi.org/10.7916/d8hx1c38 https://academiccommons.columbia.edu/doi/10.7916/D8HX1C38 unknown Columbia University https://dx.doi.org/10.1002/qj.2165 Meteorology Atmosphere Climatic changes Atmospheric chemistry Text Articles article-journal ScholarlyArticle 2013 ftdatacite https://doi.org/10.7916/d8hx1c38 https://doi.org/10.1002/qj.2165 2021-11-05T12:55:41Z Climate sensitivity in its most basic form is defined as the equilibrium change in global surface temperature that occurs in response to a climate forcing, or externally imposed perturbation of the planetary energy balance. Within this general definition, several specific forms of climate sensitivity exist that differ in terms of the types of climate feedbacks they include. Based on evidence from Earth's history, we suggest here that the relevant form of climate sensitivity in the Anthropocene (e.g. from which to base future greenhouse gas (GHG) stabilization targets) is the Earth system sensitivity including fast feedbacks from changes in water vapour, natural aerosols, clouds and sea ice, slower surface albedo feedbacks from changes in continental ice sheets and vegetation, and climate–GHG feedbacks from changes in natural (land and ocean) carbon sinks. Traditionally, only fast feedbacks have been considered (with the other feedbacks either ignored or treated as forcing), which has led to estimates of the climate sensitivity for doubled CO₂ concentrations of about 3°C. The 2×CO₂ Earth system sensitivity is higher than this, being ∼4–6°C if the ice sheet/vegetation albedo feedback is included in addition to the fast feedbacks, and higher still if climate–GHG feedbacks are also included. The inclusion of climate–GHG feedbacks due to changes in the natural carbon sinks has the advantage of more directly linking anthropogenic GHG emissions with the ensuing global temperature increase, thus providing a truer indication of the climate sensitivity to human perturbations. The Earth system climate sensitivity is difficult to quantify due to the lack of palaeo-analogues for the present-day anthropogenic forcing, and the fact that ice sheet and climate–GHG feedbacks have yet to become globally significant in the Anthropocene. Furthermore, current models are unable to adequately simulate the physics of ice sheet decay and certain aspects of the natural carbon and nitrogen cycles. Obtaining quantitative estimates of the Earth system sensitivity is therefore a high priority for future work. Text Ice Sheet Sea ice DataCite Metadata Store (German National Library of Science and Technology) |
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DataCite Metadata Store (German National Library of Science and Technology) |
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Meteorology Atmosphere Climatic changes Atmospheric chemistry |
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Meteorology Atmosphere Climatic changes Atmospheric chemistry Previdi, Michael Liepert, B. G. Peteet, Dorothy M. Hansen, James E. Beerling, D. J. Broccoli, A. J. Frolking, S. Galloway, J. N. Heimann, M. Le Quéré, C. Levitus, S. Ramaswamy, V. Climate sensitivity in the Anthropocene |
topic_facet |
Meteorology Atmosphere Climatic changes Atmospheric chemistry |
description |
Climate sensitivity in its most basic form is defined as the equilibrium change in global surface temperature that occurs in response to a climate forcing, or externally imposed perturbation of the planetary energy balance. Within this general definition, several specific forms of climate sensitivity exist that differ in terms of the types of climate feedbacks they include. Based on evidence from Earth's history, we suggest here that the relevant form of climate sensitivity in the Anthropocene (e.g. from which to base future greenhouse gas (GHG) stabilization targets) is the Earth system sensitivity including fast feedbacks from changes in water vapour, natural aerosols, clouds and sea ice, slower surface albedo feedbacks from changes in continental ice sheets and vegetation, and climate–GHG feedbacks from changes in natural (land and ocean) carbon sinks. Traditionally, only fast feedbacks have been considered (with the other feedbacks either ignored or treated as forcing), which has led to estimates of the climate sensitivity for doubled CO₂ concentrations of about 3°C. The 2×CO₂ Earth system sensitivity is higher than this, being ∼4–6°C if the ice sheet/vegetation albedo feedback is included in addition to the fast feedbacks, and higher still if climate–GHG feedbacks are also included. The inclusion of climate–GHG feedbacks due to changes in the natural carbon sinks has the advantage of more directly linking anthropogenic GHG emissions with the ensuing global temperature increase, thus providing a truer indication of the climate sensitivity to human perturbations. The Earth system climate sensitivity is difficult to quantify due to the lack of palaeo-analogues for the present-day anthropogenic forcing, and the fact that ice sheet and climate–GHG feedbacks have yet to become globally significant in the Anthropocene. Furthermore, current models are unable to adequately simulate the physics of ice sheet decay and certain aspects of the natural carbon and nitrogen cycles. Obtaining quantitative estimates of the Earth system sensitivity is therefore a high priority for future work. |
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Text |
author |
Previdi, Michael Liepert, B. G. Peteet, Dorothy M. Hansen, James E. Beerling, D. J. Broccoli, A. J. Frolking, S. Galloway, J. N. Heimann, M. Le Quéré, C. Levitus, S. Ramaswamy, V. |
author_facet |
Previdi, Michael Liepert, B. G. Peteet, Dorothy M. Hansen, James E. Beerling, D. J. Broccoli, A. J. Frolking, S. Galloway, J. N. Heimann, M. Le Quéré, C. Levitus, S. Ramaswamy, V. |
author_sort |
Previdi, Michael |
title |
Climate sensitivity in the Anthropocene |
title_short |
Climate sensitivity in the Anthropocene |
title_full |
Climate sensitivity in the Anthropocene |
title_fullStr |
Climate sensitivity in the Anthropocene |
title_full_unstemmed |
Climate sensitivity in the Anthropocene |
title_sort |
climate sensitivity in the anthropocene |
publisher |
Columbia University |
publishDate |
2013 |
url |
https://dx.doi.org/10.7916/d8hx1c38 https://academiccommons.columbia.edu/doi/10.7916/D8HX1C38 |
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Ice Sheet Sea ice |
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Ice Sheet Sea ice |
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https://dx.doi.org/10.1002/qj.2165 |
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https://doi.org/10.7916/d8hx1c38 https://doi.org/10.1002/qj.2165 |
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