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Diagnosis of Middle-Atmosphere Climate Sensitivity by the Climate Feedback-Response Analysis Method

Title: Diagnosis of Middle-Atmosphere Climate Sensitivity by the Climate Feedback-Response Analysis Method.
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Name(s): Zhu, Xun, author
Yee, Jeng-Hwa, author
Cai, Ming, author
Swartz, William H., author
Coy, Lawrence, author
Aquila, Valentina, author
Garcia, Rolando, author
Talaat, Elsayed R., author
Type of Resource: text
Genre: Text
Date Issued: 2016-01
Physical Form: computer
online resource
Extent: 1 online resource
Language(s): English
Abstract/Description: The authors present a new method to diagnose the middle-atmosphere climate sensitivity by extending the climate feedback-response analysis method (CFRAM) for the coupled atmosphere-surface system to the middle atmosphere. The middle-atmosphere CFRAM (MCFRAM) is built on the atmospheric energy equation per unit mass with radiative heating and cooling rates as its major thermal energy sources. MCFRAM preserves CFRAM's unique feature of additivity, such that partial temperature changes due to variations in external forcing and feedback processes can be added to give a total temperature change for direct comparison with the observed temperature change. In addition, MCFRAM establishes a physical relationship of radiative damping between the energy perturbations associated with various feedback processes and temperature perturbations associated with thermal responses. In this study, MCFRAM is applied to both observations and model output fields to diagnose the middle-atmosphere climate sensitivity. The authors found that the largest component of the middle-atmosphere temperature response to the 11-yr solar cycle (solar maximum vs solar minimum) is the partial temperature change due to the variation of the solar flux. Increasing CO2 cools the middle atmosphere, whereas the partial temperature change due to changes in O-3 can be either positive or negative. The application of MCFRAM to model dynamical fields reconfirms the advantage of introducing the residual circulation to characterize middle-atmosphere dynamics in terms of the partial temperature changes. The radiatively driven globally averaged partial temperature change is approximately equal to the observed temperature change, ranging from -0.5 K near 25 km to -1.0 K near 70 km between solar maximum and solar minimum.
Identifier: FSU_libsubv1_wos_000367396700001 (IID), 10.1175/JAS-D-15-0013.1 (DOI)
Keywords: acceleration, annual cycle, Circulation, lower-stratospheric temperatures, mesosphere, ozone, parameterization, radiative balance, troposphere, waves
Publication Note: The publisher’s version of record is available at http://www.dx.doi.org/10.1175/JAS-D-15-0013.1
Persistent Link to This Record: http://purl.flvc.org/fsu/fd/FSU_libsubv1_wos_000367396700001
Owner Institution: FSU
Is Part Of: Journal of the Atmospheric Sciences.
0022-4928
Issue: iss. 1, vol. 73

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Zhu, X., Yee, J. -H., Cai, M., Swartz, W. H., Coy, L., Aquila, V., … Talaat, E. R. (2016). Diagnosis of Middle-Atmosphere Climate Sensitivity by the Climate Feedback-Response Analysis Method. Journal Of The Atmospheric Sciences. Retrieved from http://purl.flvc.org/fsu/fd/FSU_libsubv1_wos_000367396700001