Radiative and Dynamical Influences on Polar Stratospheric Temperature Trends
Radiative and dynamical heating rates control stratospheric temperatures. In this study, radiative temperature trends due to ozone depletion and increasing well-mixed greenhouse gases from 1980 to 2000 in the polar stratosphere are directly evaluated, and the dynamical contributions to temperature t...
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| Format: | Article |
| Language: | en_US |
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American Meteorological Society (AMS)
2017
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| Online Access: | http://hdl.handle.net/1721.1/107737 https://orcid.org/0000-0002-2020-7581 |
| _version_ | 1826204664278810624 |
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| author | Rieder, Harald E. Ivy, Diane J Solomon, Susan |
| author2 | Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences |
| author_facet | Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences Rieder, Harald E. Ivy, Diane J Solomon, Susan |
| author_sort | Rieder, Harald E. |
| collection | MIT |
| description | Radiative and dynamical heating rates control stratospheric temperatures. In this study, radiative temperature trends due to ozone depletion and increasing well-mixed greenhouse gases from 1980 to 2000 in the polar stratosphere are directly evaluated, and the dynamical contributions to temperature trends are estimated as the residual between the observed and radiative trends. The radiative trends are obtained from a seasonally evolving fixed dynamical heating calculation with the Parallel Offline Radiative Transfer model using four different ozone datasets, which provide estimates of observed ozone changes. In the spring and summer seasons, ozone depletion leads to radiative cooling in the lower stratosphere in the Arctic and Antarctic. In Arctic summer there is weak wave driving, and the radiative cooling due to ozone depletion is the dominant driver of observed trends. In late winter and early spring, dynamics dominate the changes in Arctic temperatures. In austral spring and summer in the Antarctic, strong dynamical warming throughout the mid- to lower stratosphere acts to weaken the strong radiative cooling associated with the Antarctic ozone hole and is indicative of a strengthening of the Brewer–Dobson circulation. This dynamical warming is a significant term in the thermal budget over much of the Antarctic summer stratosphere, including in regions where strong radiative cooling due to ozone depletion can still lead to net cooling despite dynamical terms. Quantifying the contributions of changes in radiation and dynamics to stratospheric temperature trends is important for understanding how anthropogenic forcings have affected the historical trends and necessary for projecting the future. |
| first_indexed | 2024-09-23T12:58:43Z |
| format | Article |
| id | mit-1721.1/107737 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T12:58:43Z |
| publishDate | 2017 |
| publisher | American Meteorological Society (AMS) |
| record_format | dspace |
| spelling | mit-1721.1/1077372022-10-01T12:19:24Z Radiative and Dynamical Influences on Polar Stratospheric Temperature Trends Rieder, Harald E. Ivy, Diane J Solomon, Susan Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences Ivy, Diane J Solomon, Susan Radiative and dynamical heating rates control stratospheric temperatures. In this study, radiative temperature trends due to ozone depletion and increasing well-mixed greenhouse gases from 1980 to 2000 in the polar stratosphere are directly evaluated, and the dynamical contributions to temperature trends are estimated as the residual between the observed and radiative trends. The radiative trends are obtained from a seasonally evolving fixed dynamical heating calculation with the Parallel Offline Radiative Transfer model using four different ozone datasets, which provide estimates of observed ozone changes. In the spring and summer seasons, ozone depletion leads to radiative cooling in the lower stratosphere in the Arctic and Antarctic. In Arctic summer there is weak wave driving, and the radiative cooling due to ozone depletion is the dominant driver of observed trends. In late winter and early spring, dynamics dominate the changes in Arctic temperatures. In austral spring and summer in the Antarctic, strong dynamical warming throughout the mid- to lower stratosphere acts to weaken the strong radiative cooling associated with the Antarctic ozone hole and is indicative of a strengthening of the Brewer–Dobson circulation. This dynamical warming is a significant term in the thermal budget over much of the Antarctic summer stratosphere, including in regions where strong radiative cooling due to ozone depletion can still lead to net cooling despite dynamical terms. Quantifying the contributions of changes in radiation and dynamics to stratospheric temperature trends is important for understanding how anthropogenic forcings have affected the historical trends and necessary for projecting the future. National Science Foundation (U.S.) (NSF Grant 1419667) 2017-03-27T20:17:32Z 2017-03-27T20:17:32Z 2016-06 2015-11 Article http://purl.org/eprint/type/JournalArticle 0894-8755 1520-0442 http://hdl.handle.net/1721.1/107737 Ivy, Diane J., Susan Solomon, and Harald E. Rieder. “Radiative and Dynamical Influences on Polar Stratospheric Temperature Trends.” Journal of Climate 29, no. 13 (July 2016): 4927–4938. ©2016 American Meteorological Society. https://orcid.org/0000-0002-2020-7581 en_US http://dx.doi.org/10.1175/jcli-d-15-0503.1 Journal of Climate Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. application/pdf American Meteorological Society (AMS) American Meteorological Society |
| spellingShingle | Rieder, Harald E. Ivy, Diane J Solomon, Susan Radiative and Dynamical Influences on Polar Stratospheric Temperature Trends |
| title | Radiative and Dynamical Influences on Polar Stratospheric Temperature Trends |
| title_full | Radiative and Dynamical Influences on Polar Stratospheric Temperature Trends |
| title_fullStr | Radiative and Dynamical Influences on Polar Stratospheric Temperature Trends |
| title_full_unstemmed | Radiative and Dynamical Influences on Polar Stratospheric Temperature Trends |
| title_short | Radiative and Dynamical Influences on Polar Stratospheric Temperature Trends |
| title_sort | radiative and dynamical influences on polar stratospheric temperature trends |
| url | http://hdl.handle.net/1721.1/107737 https://orcid.org/0000-0002-2020-7581 |
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