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Wave forcing in the stratosphere under doubled‐CO2 conditions in a 100‐year coupled chemistry‐climate model study
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| Zeitschriftentitel: | Journal of Geophysical Research: Atmospheres |
|---|---|
| Personen und Körperschaften: | , |
| In: | Journal of Geophysical Research: Atmospheres, 115, 2010, D12 |
| Format: | E-Article |
| Sprache: | Englisch |
| veröffentlicht: |
American Geophysical Union (AGU)
|
| Schlagwörter: |
| author_facet |
Winter, B. Bourqui, M. Winter, B. Bourqui, M. |
|---|---|
| author |
Winter, B. Bourqui, M. |
| spellingShingle |
Winter, B. Bourqui, M. Journal of Geophysical Research: Atmospheres Wave forcing in the stratosphere under doubled‐CO2 conditions in a 100‐year coupled chemistry‐climate model study Paleontology Space and Planetary Science Earth and Planetary Sciences (miscellaneous) Atmospheric Science Earth-Surface Processes Geochemistry and Petrology Soil Science Water Science and Technology Ecology Aquatic Science Forestry Oceanography Geophysics |
| author_sort |
winter, b. |
| spelling |
Winter, B. Bourqui, M. 0148-0227 American Geophysical Union (AGU) Paleontology Space and Planetary Science Earth and Planetary Sciences (miscellaneous) Atmospheric Science Earth-Surface Processes Geochemistry and Petrology Soil Science Water Science and Technology Ecology Aquatic Science Forestry Oceanography Geophysics http://dx.doi.org/10.1029/2009jd012777 <jats:p>The impact of doubling atmospheric CO<jats:sub>2</jats:sub> on the resolved‐wave forcing of the stratospheric flow, and thus on the Brewer‐Dobson circulation (BDC), is investigated with 100‐year timeslice simulations using a chemistry‐climate model, the IGCM‐FASTOC, coupled to a mixed‐layer slab ocean. The Arctic lower stratosphere in winter warms by up to 4 K, with associated weakening of the polar vortex and enhancement of the BDC. This change is related to a significant increase in the wave forcing near the vortex core starting in January, followed by an increased wave forcing at the lower edge of the polar vortex in February. Maximum wave forcing is found both to occur earlier in the winter and to be distributed over a longer period of time in the 2 × CO<jats:sub>2</jats:sub> climate. The sensitivity to surface conditions is studied by repeating the CO<jats:sub>2</jats:sub>‐doubling experiments with prescribed interannually varying and fixed annual cycle monthly mean surface temperatures. In the absence of interannual variability, the BDC response is strongly attenuated. With interannual variability, the monthly mean prescribed surface temperatures lead to a similar dynamical response in the stratosphere as found with the interactive surface but with reduced magnitude.</jats:p> Wave forcing in the stratosphere under doubled‐CO<sub>2</sub> conditions in a 100‐year coupled chemistry‐climate model study Journal of Geophysical Research: Atmospheres |
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Geologie und Paläontologie Geographie Chemie und Pharmazie Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft Biologie Allgemeine Naturwissenschaft Physik Technik |
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| title |
Wave forcing in the stratosphere under doubled‐CO2 conditions in a 100‐year coupled chemistry‐climate model study |
| title_unstemmed |
Wave forcing in the stratosphere under doubled‐CO2 conditions in a 100‐year coupled chemistry‐climate model study |
| title_full |
Wave forcing in the stratosphere under doubled‐CO2 conditions in a 100‐year coupled chemistry‐climate model study |
| title_fullStr |
Wave forcing in the stratosphere under doubled‐CO2 conditions in a 100‐year coupled chemistry‐climate model study |
| title_full_unstemmed |
Wave forcing in the stratosphere under doubled‐CO2 conditions in a 100‐year coupled chemistry‐climate model study |
| title_short |
Wave forcing in the stratosphere under doubled‐CO2 conditions in a 100‐year coupled chemistry‐climate model study |
| title_sort |
wave forcing in the stratosphere under doubled‐co<sub>2</sub> conditions in a 100‐year coupled chemistry‐climate model study |
| topic |
Paleontology Space and Planetary Science Earth and Planetary Sciences (miscellaneous) Atmospheric Science Earth-Surface Processes Geochemistry and Petrology Soil Science Water Science and Technology Ecology Aquatic Science Forestry Oceanography Geophysics |
| url |
http://dx.doi.org/10.1029/2009jd012777 |
| publishDate |
2010 |
| physical |
|
| description |
<jats:p>The impact of doubling atmospheric CO<jats:sub>2</jats:sub> on the resolved‐wave forcing of the stratospheric flow, and thus on the Brewer‐Dobson circulation (BDC), is investigated with 100‐year timeslice simulations using a chemistry‐climate model, the IGCM‐FASTOC, coupled to a mixed‐layer slab ocean. The Arctic lower stratosphere in winter warms by up to 4 K, with associated weakening of the polar vortex and enhancement of the BDC. This change is related to a significant increase in the wave forcing near the vortex core starting in January, followed by an increased wave forcing at the lower edge of the polar vortex in February. Maximum wave forcing is found both to occur earlier in the winter and to be distributed over a longer period of time in the 2 × CO<jats:sub>2</jats:sub> climate. The sensitivity to surface conditions is studied by repeating the CO<jats:sub>2</jats:sub>‐doubling experiments with prescribed interannually varying and fixed annual cycle monthly mean surface temperatures. In the absence of interannual variability, the BDC response is strongly attenuated. With interannual variability, the monthly mean prescribed surface temperatures lead to a similar dynamical response in the stratosphere as found with the interactive surface but with reduced magnitude.</jats:p> |
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| description | <jats:p>The impact of doubling atmospheric CO<jats:sub>2</jats:sub> on the resolved‐wave forcing of the stratospheric flow, and thus on the Brewer‐Dobson circulation (BDC), is investigated with 100‐year timeslice simulations using a chemistry‐climate model, the IGCM‐FASTOC, coupled to a mixed‐layer slab ocean. The Arctic lower stratosphere in winter warms by up to 4 K, with associated weakening of the polar vortex and enhancement of the BDC. This change is related to a significant increase in the wave forcing near the vortex core starting in January, followed by an increased wave forcing at the lower edge of the polar vortex in February. Maximum wave forcing is found both to occur earlier in the winter and to be distributed over a longer period of time in the 2 × CO<jats:sub>2</jats:sub> climate. The sensitivity to surface conditions is studied by repeating the CO<jats:sub>2</jats:sub>‐doubling experiments with prescribed interannually varying and fixed annual cycle monthly mean surface temperatures. In the absence of interannual variability, the BDC response is strongly attenuated. With interannual variability, the monthly mean prescribed surface temperatures lead to a similar dynamical response in the stratosphere as found with the interactive surface but with reduced magnitude.</jats:p> |
| doi_str_mv | 10.1029/2009jd012777 |
| facet_avail | Online, Free |
| finc_class_facet | Geologie und Paläontologie, Geographie, Chemie und Pharmazie, Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft, Biologie, Allgemeine Naturwissenschaft, Physik, Technik |
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| imprint_str_mv | American Geophysical Union (AGU), 2010 |
| institution | DE-D275, DE-Bn3, DE-Brt1, DE-Zwi2, DE-D161, DE-Gla1, DE-Zi4, DE-15, DE-Pl11, DE-Rs1, DE-105, DE-14, DE-Ch1, DE-L229 |
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| spelling | Winter, B. Bourqui, M. 0148-0227 American Geophysical Union (AGU) Paleontology Space and Planetary Science Earth and Planetary Sciences (miscellaneous) Atmospheric Science Earth-Surface Processes Geochemistry and Petrology Soil Science Water Science and Technology Ecology Aquatic Science Forestry Oceanography Geophysics http://dx.doi.org/10.1029/2009jd012777 <jats:p>The impact of doubling atmospheric CO<jats:sub>2</jats:sub> on the resolved‐wave forcing of the stratospheric flow, and thus on the Brewer‐Dobson circulation (BDC), is investigated with 100‐year timeslice simulations using a chemistry‐climate model, the IGCM‐FASTOC, coupled to a mixed‐layer slab ocean. The Arctic lower stratosphere in winter warms by up to 4 K, with associated weakening of the polar vortex and enhancement of the BDC. This change is related to a significant increase in the wave forcing near the vortex core starting in January, followed by an increased wave forcing at the lower edge of the polar vortex in February. Maximum wave forcing is found both to occur earlier in the winter and to be distributed over a longer period of time in the 2 × CO<jats:sub>2</jats:sub> climate. The sensitivity to surface conditions is studied by repeating the CO<jats:sub>2</jats:sub>‐doubling experiments with prescribed interannually varying and fixed annual cycle monthly mean surface temperatures. In the absence of interannual variability, the BDC response is strongly attenuated. With interannual variability, the monthly mean prescribed surface temperatures lead to a similar dynamical response in the stratosphere as found with the interactive surface but with reduced magnitude.</jats:p> Wave forcing in the stratosphere under doubled‐CO<sub>2</sub> conditions in a 100‐year coupled chemistry‐climate model study Journal of Geophysical Research: Atmospheres |
| spellingShingle | Winter, B., Bourqui, M., Journal of Geophysical Research: Atmospheres, Wave forcing in the stratosphere under doubled‐CO2 conditions in a 100‐year coupled chemistry‐climate model study, Paleontology, Space and Planetary Science, Earth and Planetary Sciences (miscellaneous), Atmospheric Science, Earth-Surface Processes, Geochemistry and Petrology, Soil Science, Water Science and Technology, Ecology, Aquatic Science, Forestry, Oceanography, Geophysics |
| title | Wave forcing in the stratosphere under doubled‐CO2 conditions in a 100‐year coupled chemistry‐climate model study |
| title_full | Wave forcing in the stratosphere under doubled‐CO2 conditions in a 100‐year coupled chemistry‐climate model study |
| title_fullStr | Wave forcing in the stratosphere under doubled‐CO2 conditions in a 100‐year coupled chemistry‐climate model study |
| title_full_unstemmed | Wave forcing in the stratosphere under doubled‐CO2 conditions in a 100‐year coupled chemistry‐climate model study |
| title_short | Wave forcing in the stratosphere under doubled‐CO2 conditions in a 100‐year coupled chemistry‐climate model study |
| title_sort | wave forcing in the stratosphere under doubled‐co<sub>2</sub> conditions in a 100‐year coupled chemistry‐climate model study |
| title_unstemmed | Wave forcing in the stratosphere under doubled‐CO2 conditions in a 100‐year coupled chemistry‐climate model study |
| topic | Paleontology, Space and Planetary Science, Earth and Planetary Sciences (miscellaneous), Atmospheric Science, Earth-Surface Processes, Geochemistry and Petrology, Soil Science, Water Science and Technology, Ecology, Aquatic Science, Forestry, Oceanography, Geophysics |
| url | http://dx.doi.org/10.1029/2009jd012777 |