Other
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsa41a0276d&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #SA41A-0276
Other
0310 Airglow And Aurora, 1616 Climate Variability (1635, 3305, 3309, 4215, 4513), 3305 Climate Change And Variability (1616, 1635, 3309, 4215, 4513), 3334 Middle Atmosphere Dynamics (0341, 0342), 5754 Polar Regions
Scientific paper
This paper reports on the temperature and dynamics of the hydroxyl layer at approx. 87km measured over Longyearbyen (78N 16E) during the 2003-2004 winter. Optical spectra obtained by a Ebert-Fastie spectrometer were used for the temperature derivation. The high number of spectra available enabled spectral analysis of both the hourly and daily averaged temperatures. We were able to identify both the presence of a 16 day wave and a quasi 27 day oscillation in the mesopause region (approx. 87 km) temperatures from this season. The average daily temperature was 228K with a standard deviation of 17K. This is exceptionally high compared to previous and later years reported in the 23 year old time series from Svalbard. The observed temperatures have been compared to temperature data from other height regions above the Arctic (troposphere and stratosphere) and to satellite data from the satellite instrument SABER. In early January 2004 a major stratospheric warming event led to a nearly 2 month long vortex disruption with high-latitude easterlies in the middle to lower stratosphere and correspondingly high temperatures. The upper stratospheric temperatures of the same period were unusually low, while mesopause temperatures were high. The regions of alternating low and high temperatures throughout the atmosphere and the dynamics of these, are clearly coupled through gravity wave activity and general atmospheric circulation. We try to put our data into context with other authors' reports on the anomalous state of the atmosphere during the 2003-2004 boreal winter.
Deehr Charles S.
Dyrland M. E.
Mulligan F.
Sigernes Fred
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