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EOS Microwave Limb Sounder observations of ‘‘frozen-in’’ anticyclonic air in Arctic summer

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dc.contributor.author Manney, G. L.
dc.contributor.author Livesey, N. J.
dc.contributor.author Jimenez, C. J.
dc.contributor.author Pumphrey, H. C.
dc.contributor.author Santee, M. L.
dc.contributor.author MacKenzie, I. A.
dc.contributor.author Waters, J. W.
dc.date.accessioned 2007-08-09T20:15:33Z
dc.date.available 2007-08-09T20:15:33Z
dc.date.issued 2006-03-23
dc.identifier.citation Geophysical Research Letters, Vol. 33, L06810, doi:10.1029/2005GL025418, 2006 en
dc.identifier.clearanceno 05-3892
dc.identifier.uri http://hdl.handle.net/2014/40361
dc.description.abstract A previously unreported phenomenon, a ‘‘frozen-in’’ anticyclone (FrIAC) after the 2005 Arctic spring vortex breakup, was discovered in Earth Observing System (EOS) Microwave Limb Sounder (MLS) long-lived trace gas data. A tongue of low-latitude (high-N2O, low-H2O) air was drawn into high latitudes and confined in a tight anticyclone, then advected intact in the summer easterlies through late August. A similar feature in O3 disappeared by early April as a result of chemical processes. The FrIAC was initially advected upright at nearly the same speed at all levels from ~660 to 1300 K (~25–45 km); increasing vertical wind shear after early June tilted the FrIAC and weakened it at higher levels. The associated feature in PV disappeared by early June; transport calculations fail to reproduce the remarkable persistence of the FrIAC, suggesting deficiencies in summer high-latitude winds. The historical PV record suggests that this phenomenon may have occurred several times before. The lack of a persistent signature in O3 or PV, along with its small size and rapid motion, make it unlikely that a FrIAC could have been reliably identified without hemispheric daily longlived trace gas profiles such as those from EOS MLS. en
dc.description.sponsorship NASA/JPL en
dc.format.extent 4191060 bytes
dc.format.mimetype application/pdf
dc.language.iso en_US en
dc.publisher The American Geophysical Union en
dc.subject Arctic vortex en
dc.subject stratospheric warming en
dc.title EOS Microwave Limb Sounder observations of ‘‘frozen-in’’ anticyclonic air in Arctic summer en
dc.type Article en


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