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|Title: ||EOS Microwave Limb Sounder observations of ‘‘frozen-in’’ anticyclonic air in Arctic summer|
|Authors: ||Manney, G. L.|
Livesey, N. J.
Jimenez, C. J.
Pumphrey, H. C.
Santee, M. L.
MacKenzie, I. A.
Waters, J. W.
|Keywords: ||Arctic vortex|
|Issue Date: ||23-Mar-2006 |
|Publisher: ||The American Geophysical Union|
|Citation: ||Geophysical Research Letters, Vol. 33, L06810, doi:10.1029/2005GL025418, 2006|
|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.|
|Appears in Collections:||JPL TRS 1992+|
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