Physics
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsa34a..03r&link_type=abstract
American Geophysical Union, Fall Meeting 2004, abstract #SA34A-03
Physics
3334 Middle Atmosphere Dynamics (0341, 0342), 3337 Numerical Modeling And Data Assimilation, 3360 Remote Sensing, 3384 Waves And Tides, 3309 Climatology (1620)
Scientific paper
In the upper mesosphere, westward propagating waves are sometimes observed with periods between 5 and 7 days. These motions are usually attributed to the so-called 5-day wave, a wavenumber 1, Rossby planetary wave that has been extensively studied in the stratosphere. A survey was carried out of planetary wave signatures in SABER temperatures over the three years of the mission. We find that 5-day wave events are relatively infrequent in the upper mesosphere. However, during May of 2003, an exceptionally strong outbreak of 5-day wave activity was observed by SABER with an amplitude of 15 K at mesopause heights. The wave penetrated well into the thermosphere. Although the period of this wave was longer than 5 days ( ˜6 days), its global structure was consistent with that of the 5-day normal mode. The May 2003 event also showed up strongly in a year-long run of the NCAR TIME-GCM model that was forced at the 10 hPa lower boundary with NCEP reanalyses. The model output is used to study the relationship of mesospheric 5-day wave activity to perturbations in the lower atmosphere and diagnose the background conditions that determine wave propagation and amplification.
Lieberman Ruth S.
Liu Hongya
Riggin Dennis M.
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