Climatology of the stationary planetary waves seen in the SABER/TIMED temperatures (2002-2007)

Details Climatology of the stationary planetary waves seen in the SABER/TIMED temperatures (2002-2007) Climatology of the stationary planetary waves seen in the SABER/TIMED temperatures (2002-2007)

Jun 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010jgra..11506315m&link_type=abstract

Journal of Geophysical Research, Volume 115, Issue A6, CiteID A06315

Physics

2

Atmospheric Processes: Tides And Planetary Waves, Atmospheric Processes: Thermospheric Dynamics (0358), Atmospheric Processes: Middle Atmosphere Dynamics (0341, 0342), Atmospheric Processes: Mesospheric Dynamics, Magnetospheric Physics: Auroral Phenomena (2407)

Scientific paper

The paper focuses on the global spatial structure, seasonal and interannual variability of the stationary planetary waves (SPW) with zonal wavenumber s = 1 (SPW1) and s = 2 (SPW2) derived from the SABER/TIMED temperature measurements for 6 full years (January 2002-December 2007). The monthly mean climatological (multiyear average, 2002-2007) depictions of SPW temperature field extending between 20 and 120 km altitude and ±50° latitude are derived. A special attention is paid to the SPW temperature field in the lower thermosphere where the SPW1 amplifies in May and December-January in the northern hemisphere (NH) and in April-May and November in the southern hemisphere (SH). Amplitudes in both hemispheres are similar in strato-mesosphere; however, in the lower thermosphere SH amplitudes are significantly larger (˜30 K) than those in NH (˜20 K). The NH SPW1 is able to propagate up to 115 km altitude contributing to the winter amplification of the lower thermospheric SPW1, but that from the SH cannot penetrate above ˜90-100 km. In the lower thermosphere (above h = 100 km) mainly trapped SPW signal is observed. The SPW1 are almost out of phase in both hemispheres; the average (2002-2007) phases are ˜100°W in NH and ˜120°E in SH. Strong evidence indicates that auroral heating is a main origin of the lower thermospheric SPW temperature field.

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