An upper-branch Brewer-Dobson circulation index for attribution of stratospheric variability and improved ozone and temperature trend analysis

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dc.contributor.authorBall WT
dc.contributor.authorKuchar A
dc.contributor.authorRozanov EV
dc.contributor.authorStaehelin J
dc.contributor.authorTummon F
dc.contributor.authorSmith AK
dc.contributor.authorSukhodolov T
dc.contributor.authorStenke A
dc.contributor.authorRevell L
dc.contributor.authorCoulon A
dc.contributor.authorSchmutz W
dc.contributor.authorPeter T
dc.date.accessioned2019-09-23T21:54:22Z
dc.date.available2019-09-23T21:54:22Z
dc.date.issued2016en
dc.date.updated2018-06-13T23:16:52Z
dc.description.abstractWe find that wintertime temperature anomalies near 4hPa and 50◦N/S are related, through dynamics, to anomalies in ozone and temperature, particularly in the tropical stratosphere but also throughout the upper stratosphere and mesosphere. These mid-latitude anomalies occur on timescales of up to a month, and are related to changes in wave forcing. A change in the meridional Brewer–Dobson circulation extends from the middle stratosphere into the mesosphere and forms a temperature-change quadrupole from Equator to pole. We develop a dynamical index based on detrended, deseasonalised mid-latitude temperature. When employed in multiple linear regression, this index can account for up to 60% of the total variability of temperature, peaking at ∼5hPa and dropping to 0 at ∼50 and ∼0.5hPa, respectively, and increasing again into the mesosphere. Ozone similarly sees up to an additional 50%ofvariabilityaccountedfor,withaslightlyhighermaximum and strong altitude dependence, with zero improvement found at 10hPa. Further, the uncertainty on all equatorial multiple-linear regression coefficients can be reduced byupto35and20%intemperatureandozone,respectively, and so this index is an important tool for quantifying current and future ozone recovery.en
dc.identifier.doihttps://doi.org/10.5194/acp-16-15485-2016
dc.identifier.issn1680-7316
dc.identifier.issn1680-7324
dc.identifier.urihttp://hdl.handle.net/10092/17277
dc.language.isoen
dc.rights© Author(s) 2016. CC Attribution 3.0 License.en
dc.subject.anzsrcField of Research::02 - Physical Sciencesen
dc.subject.anzsrcFields of Research::37 - Earth sciences::3701 - Atmospheric sciences::370104 - Atmospheric composition, chemistry and processesen
dc.titleAn upper-branch Brewer-Dobson circulation index for attribution of stratospheric variability and improved ozone and temperature trend analysisen
dc.typeJournal Articleen
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