On the aliasing of the solar cycle in the lower stratospheric tropical temperature

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dc.contributor.authorKuchar A
dc.contributor.authorBall WT
dc.contributor.authorRozanov EV
dc.contributor.authorStenke A
dc.contributor.authorRevell L
dc.contributor.authorMiksovsky J
dc.contributor.authorPisoft P
dc.contributor.authorPeter T
dc.date.accessioned2018-08-09T00:38:13Z
dc.date.available2018-08-09T00:38:13Z
dc.date.issued2017en
dc.date.updated2018-06-13T23:14:29Z
dc.description.abstract©2017. American Geophysical Union. All Rights Reserved. The double-peaked response of the tropical stratospheric temperature profile to the 11 year solar cycle (SC) has been well documented. However, there are concerns about the origin of the lower peak due to potential aliasing with volcanic eruptions or the El Niño–Southern Oscillation (ENSO) detected using multiple linear regression analysis. We confirm the aliasing using the results of the chemistry-climate model (CCM) SOCOLv3 obtained in the framework of the International Global Atmospheric Chemisty/Stratosphere-troposphere Processes And their Role in Climate Chemistry-Climate Model Initiative phase 1. We further show that even without major volcanic eruptions included in transient simulations, the lower stratospheric response exhibits a residual peak when historical sea surface temperatures (SSTs)/sea ice coverage (SIC) are used. Only the use of climatological SSTs/SICs in addition to background stratospheric aerosols removes volcanic and ENSO signals and results in an almost complete disappearance of the modeled solar signal in the lower stratospheric temperature. We demonstrate that the choice of temporal subperiod considered for the regression analysis has a large impact on the estimated profile signal in the lower stratosphere: at least 45 consecutive years are needed to avoid the large aliasing effect of SC maxima with volcanic eruptions in 1982 and 1991 in historical simulations, reanalyses, and observations. The application of volcanic forcing compiled for phase 6 of the Coupled Model Intercomparison Project (CMIP6) in the CCM SOCOLv3 reduces the warming overestimation in the tropical lower stratosphere and the volcanic aliasing of the temperature response to the SC, although it does not eliminate it completely.en
dc.identifier.doihttps://doi.org/10.1002/2017JD026948
dc.identifier.issn2169-897X
dc.identifier.issn2169-8996
dc.identifier.urihttp://hdl.handle.net/10092/15750
dc.language.isoen
dc.subject.anzsrcField of Research::04 - Earth Sciences::0401 - Atmospheric Sciences::040108 - Tropospheric and Stratospheric Physicsen
dc.subject.anzsrcFields of Research::37 - Earth sciences::3701 - Atmospheric sciences::370105 - Atmospheric dynamicsen
dc.titleOn the aliasing of the solar cycle in the lower stratospheric tropical temperatureen
dc.typeJournal Articleen
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