EOS Microwave Limb Sounder observations of ``frozen-in'' anticyclonic air in Arctic summer

Details EOS Microwave Limb Sounder observations of ``frozen-in'' anticyclonic air in Arctic summer EOS Microwave Limb Sounder observations of ``frozen-in'' anticyclonic air in Arctic summer

Mar 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006georl..3306810m&link_type=abstract

Geophysical Research Letters, Volume 33, Issue 6, CiteID L06810

Computer Science

Sound

8

Atmospheric Composition And Structure: Middle Atmosphere: Composition And Chemistry, Atmospheric Composition And Structure: Middle Atmosphere: Constituent Transport And Chemistry (3334), Atmospheric Processes: Middle Atmosphere Dynamics (0341, 0342)

Scientific paper

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 long-lived trace gas profiles such as those from EOS MLS.

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