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19 August 1998 Lidar observations of the middle-atmosphere thermal tides at Mauna Loa (19.5°N): comparison with HRDI and GSWM
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Abstract
The tidal signature in the middle atmospheric thermal structure (15 - 95 km) at Mauna Loa, Hawaii, (19.5 degrees N) is investigated using more than 145 hours of nighttime lidar measurements obtained during October 3 - 16, 1996 and October 2 - 11, 1997. The daytime HRDI temperatures taken in September and October 1993 - 1997 and zonally averaged at the same latitude are also used. The nighttime lidar and daytime HRDI temperature evolution and tidal signatures are compared to the predictions of the GSWM tidal model. Agreement is found between lidar and GSWM below 60 km, and between HRDI and GSWM above 85 km. Some significant disagreement is found between 60 and 80 km altitude. In particular, a strong semidiurnal signature is observed by lidar and not predicted by GSWM. It appears that the tidal structure observed by lidar is more representative of that predicted by GSWM at 24 degrees N, suggesting a latitudinal shift between theory and observation. It is not clear whether this shift is related to an indetermination of the tidal source and/or propagation or if the observed differences are simply due to local/regional Local-Solar-Time-related oscillations obscuring the tidal signature.
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Thierry Leblanc, I. Stuart McDermid, and David A. Ortland "Lidar observations of the middle-atmosphere thermal tides at Mauna Loa (19.5°N): comparison with HRDI and GSWM", Proc. SPIE 3504, Optical Remote Sensing for Industry and Environmental Monitoring, (19 August 1998); https://doi.org/10.1117/12.319573
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