Evidence of tidal perturbations in the middle atmosphere over Southern Tropics as deduced from LIDAR data analyses

Details Evidence of tidal perturbations in the middle atmosphere over Southern Tropics as deduced from LIDAR data analyses Evidence of tidal perturbations in the middle atmosphere over Southern Tropics as deduced from LIDAR data analyses

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002jastp..64.1979m&link_type=abstract

Journal of Atmospheric and Solar-Terrestrial Physics, Volume 64, Issue 18, p. 1979-1988.

Physics

11

Scientific paper

Systematic measurements of the middle-atmosphere temperature by a RAYLEIGH LIDAR located at La Réunion Island (/20.8°S-/55.5°E) has led to a preliminary study of the tidal effects in the height range of 30-70 km. Two analysis methods able to estimate the mean nighttime evolution of the temperature have been compared. Method 1 consists in averaging the temperature deviations from the nightly mean over several successive nights of measurement for given local solar times (LST); method 2 consists in averaging the raw data over the period of observation for given LST and in deriving afterwards the mean nighttime evolution of the temperature profiles. Some consistent LST-related structures have been observed with both methods, though better results have been obtained with method 1. One possible explanation for the differences between the two methods is the use of a series of data ranging from 4 to 8h/night, depending on the meteorological conditions. In contrast to method 2, method 1 allows to correct the mean temperature for a given night, when the measurement window is different from night to night. Method 1 has been applied to two time series recorded in October and November 1995. The results clearly show the presence of tidal components with a downward phase propagation, specifically a warmer early night and a colder midnight in the stratosphere and the lower mesosphere. This behaviour is consistent with other LIDAR measurements made at similar latitudes in the Northern Hemisphere. In addition, a close comparison with the Global-Scale Wave Model (GSWM) tidal model predictions has also pointed out some similarities. Yet, large discrepancies in magnitude are also observed: as already reported in previous studies, the amplitudes predicted by GSWM are more than two times smaller compared to the corresponding values observed with the LIDAR.

Affiliated with

Also associated with

No associations

Rating

Evidence of tidal perturbations in the middle atmosphere over Southern Tropics as deduced from LIDAR data analyses does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Evidence of tidal perturbations in the middle atmosphere over Southern Tropics as deduced from LIDAR data analyses, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Evidence of tidal perturbations in the middle atmosphere over Southern Tropics as deduced from LIDAR data analyses will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-967263