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

Show simple item record Manney, G. L. Livesey, N. J. Jimenez, C. J. Pumphrey, H. C. Santee, M. L. MacKenzie, I. A. Waters, J. W. 2007-08-09T20:15:33Z 2007-08-09T20:15:33Z 2006-03-23
dc.identifier.citation Geophysical Research Letters, Vol. 33, L06810, doi:10.1029/2005GL025418, 2006 en
dc.identifier.clearanceno 05-3892
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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