Physics
Scientific paper
Sep 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008georl..3518803t&link_type=abstract
Geophysical Research Letters, Volume 35, Issue 18, CiteID L18803
Physics
4
Atmospheric Processes: Middle Atmosphere Dynamics (0341, 0342), Atmospheric Processes: Mesospheric Dynamics, Atmospheric Processes: Remote Sensing, Atmospheric Processes: Polar Meteorology, Atmospheric Processes: Synoptic-Scale Meteorology
Scientific paper
A regional wintertime mesosphere cooling of 30-40 K is observed over the Sondrestrom facility near Kangerlussuaq, Greenland (67.0°N, 309.1°E) during multiple weeks in December 2000 where temperatures from the ground to 90 km were uniquely observed. The negative excursions in mesosphere temperature were observed during times when no thermal changes are observed below 10 hPa (~30 km), but strong temperature changes are observed above this pressure surface. These thermal features are associated with middle atmosphere disturbances that may occur prior to, or independently of, major stratospheric warmings. They are regionally confined, deviate significantly from ambient conditions, and are likely caused by adiabatic cooling/heating due to strong vertical velocities. We propose that these types of mesosphere cooling events are related to stratospheric baroclinic zones and a Q-vector analysis of stratospheric geopotential and temperature fields can be used to help identify and describe regional occurrences of significant cooling in the mesosphere.
Livingston John M.
Thayer Jeffrey P.
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