The aerosol pathway is crucial for observationally constraining climate sensitivity and anthropogenic forcing
<p>Climate sensitivity and aerosol forcing are two of the most central, but uncertain, quantities in climate science that are crucial for assessing historical climate as well as future climate projections. Here, we use a Bayesian approach to estimate inferred climate sensitivity and aerosol fo...
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Copernicus Publications
2024-11-01
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| Series: | Earth System Dynamics |
| Online Access: | https://esd.copernicus.org/articles/15/1435/2024/esd-15-1435-2024.pdf |
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| author | R. B. Skeie M. Aldrin T. K. Berntsen M. Holden R. B. Huseby G. Myhre T. Storelvmo |
| author_facet | R. B. Skeie M. Aldrin T. K. Berntsen M. Holden R. B. Huseby G. Myhre T. Storelvmo |
| author_sort | R. B. Skeie |
| collection | DOAJ |
| description | <p>Climate sensitivity and aerosol forcing are two of the most central, but uncertain, quantities in climate science that are crucial for assessing historical climate as well as future climate projections. Here, we use a Bayesian approach to estimate inferred climate sensitivity and aerosol forcing using observations of temperature and global ocean heat content as well as prior knowledge of effective radiative forcing (ERF) over the industrial period. Due to limited information on uncertainties related to the time evolution of aerosol forcing, we perform a range of sensitivity analyses with idealized aerosol time evolution. The estimates are sensitive to the aerosol forcing pathway, with the mean estimate of inferred effective climate sensitivity ranging from 2.0 to 2.4 K, present-day (2019 relative to 1750) aerosol ERF ranging from <span class="inline-formula">−0.7</span> to <span class="inline-formula">−1.1</span> <span class="inline-formula">W m<sup>−2</sup></span>, and anthropogenic ERF ranging from 2.6 to 3.1 <span class="inline-formula">W m<sup>−2</sup></span>. Using observations and forcing up to and including 2022, the inferred effective climate sensitivity is 2.2 K with a 1.6 to 3.0 K 90 % uncertainty range. Analysis with more freely evolving aerosol forcing between 1950 and 2014 shows that a strong negative aerosol forcing trend in the latter part of the 20th century is not consistent with observations. Although we test our estimation method with strongly idealized aerosol ERF pathways, our posteriori estimates of the climate sensitivity consistently end up in the weaker end of the range assessed in the Sixth Assessment Report of the Intergovernmental Panel on Climate Change (IPCC AR6). As our method only includes climate feedbacks that have occurred over the historical period, it does not include the pattern effect, i.e., where climate feedbacks are dependent on the pattern of warming which will likely change into the future. Adding the best estimate of the pattern effect from IPCC AR6, our climate sensitivity estimate is almost identical to the IPCC AR6 best estimate and very likely range.</p> |
| format | Article |
| id | doaj-art-9c3990950e404b17a5d1b8d20e52b515 |
| institution | Kabale University |
| issn | 2190-4979 2190-4987 |
| language | English |
| publishDate | 2024-11-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Earth System Dynamics |
| spelling | doaj-art-9c3990950e404b17a5d1b8d20e52b5152024-11-13T11:05:16ZengCopernicus PublicationsEarth System Dynamics2190-49792190-49872024-11-01151435145810.5194/esd-15-1435-2024The aerosol pathway is crucial for observationally constraining climate sensitivity and anthropogenic forcingR. B. Skeie0M. Aldrin1T. K. Berntsen2M. Holden3R. B. Huseby4G. Myhre5T. Storelvmo6CICERO Center for International Climate Research, P.O. Box 1129 Blindern, 0318 Oslo, NorwayNorwegian Computing Center, P.O. Box 114 Blindern, 0314 Oslo, NorwayDepartment of Geosciences, University of Oslo, P.O. Box 1047 Blindern, 0316 Oslo, NorwayNorwegian Computing Center, P.O. Box 114 Blindern, 0314 Oslo, NorwayNorwegian Computing Center, P.O. Box 114 Blindern, 0314 Oslo, NorwayCICERO Center for International Climate Research, P.O. Box 1129 Blindern, 0318 Oslo, NorwayDepartment of Geosciences, University of Oslo, P.O. Box 1047 Blindern, 0316 Oslo, Norway<p>Climate sensitivity and aerosol forcing are two of the most central, but uncertain, quantities in climate science that are crucial for assessing historical climate as well as future climate projections. Here, we use a Bayesian approach to estimate inferred climate sensitivity and aerosol forcing using observations of temperature and global ocean heat content as well as prior knowledge of effective radiative forcing (ERF) over the industrial period. Due to limited information on uncertainties related to the time evolution of aerosol forcing, we perform a range of sensitivity analyses with idealized aerosol time evolution. The estimates are sensitive to the aerosol forcing pathway, with the mean estimate of inferred effective climate sensitivity ranging from 2.0 to 2.4 K, present-day (2019 relative to 1750) aerosol ERF ranging from <span class="inline-formula">−0.7</span> to <span class="inline-formula">−1.1</span> <span class="inline-formula">W m<sup>−2</sup></span>, and anthropogenic ERF ranging from 2.6 to 3.1 <span class="inline-formula">W m<sup>−2</sup></span>. Using observations and forcing up to and including 2022, the inferred effective climate sensitivity is 2.2 K with a 1.6 to 3.0 K 90 % uncertainty range. Analysis with more freely evolving aerosol forcing between 1950 and 2014 shows that a strong negative aerosol forcing trend in the latter part of the 20th century is not consistent with observations. Although we test our estimation method with strongly idealized aerosol ERF pathways, our posteriori estimates of the climate sensitivity consistently end up in the weaker end of the range assessed in the Sixth Assessment Report of the Intergovernmental Panel on Climate Change (IPCC AR6). As our method only includes climate feedbacks that have occurred over the historical period, it does not include the pattern effect, i.e., where climate feedbacks are dependent on the pattern of warming which will likely change into the future. Adding the best estimate of the pattern effect from IPCC AR6, our climate sensitivity estimate is almost identical to the IPCC AR6 best estimate and very likely range.</p>https://esd.copernicus.org/articles/15/1435/2024/esd-15-1435-2024.pdf |
| spellingShingle | R. B. Skeie M. Aldrin T. K. Berntsen M. Holden R. B. Huseby G. Myhre T. Storelvmo The aerosol pathway is crucial for observationally constraining climate sensitivity and anthropogenic forcing Earth System Dynamics |
| title | The aerosol pathway is crucial for observationally constraining climate sensitivity and anthropogenic forcing |
| title_full | The aerosol pathway is crucial for observationally constraining climate sensitivity and anthropogenic forcing |
| title_fullStr | The aerosol pathway is crucial for observationally constraining climate sensitivity and anthropogenic forcing |
| title_full_unstemmed | The aerosol pathway is crucial for observationally constraining climate sensitivity and anthropogenic forcing |
| title_short | The aerosol pathway is crucial for observationally constraining climate sensitivity and anthropogenic forcing |
| title_sort | aerosol pathway is crucial for observationally constraining climate sensitivity and anthropogenic forcing |
| url | https://esd.copernicus.org/articles/15/1435/2024/esd-15-1435-2024.pdf |
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