Evidence of tidal perturbations in the middle atmosphere over Southern Tropics as deduced from LIDAR data analyses
| العنوان: | Evidence of tidal perturbations in the middle atmosphere over Southern Tropics as deduced from LIDAR data analyses |
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| المؤلفون: | Béatrice Morel, Alain Hauchecorne, Serge Baldy, Hassan Bencherif, Philippe Keckhut |
| المساهمون: | Laboratoire de physique de l'atmosphère (LPA), Institut national des sciences de l'Univers (INSU - CNRS)-Université de La Réunion (UR)-Centre National de la Recherche Scientifique (CNRS), Service d'aéronomie (SA), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) |
| المصدر: | Journal of Atmospheric and Solar-Terrestrial Physics Journal of Atmospheric and Solar-Terrestrial Physics, Elsevier, 2002, 64 (18), pp.1979-1988. ⟨10.1016/S1364-6826(02)00223-7⟩ Journal of Atmospheric and Solar-Terrestrial Physics, 2002, 64 (18), pp.1979-1988. ⟨10.1016/S1364-6826(02)00223-7⟩ |
| بيانات النشر: | Elsevier BV, 2002. |
| سنة النشر: | 2002 |
| مصطلحات موضوعية: | [PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph], Atmospheric Science, 010504 meteorology & atmospheric sciences, Meteorology, Northern Hemisphere, LIDAR measurements, Atmospheric sciences, 01 natural sciences, Middle-atmospheric tides, Latitude, Mesosphere, Atmosphere, Wave model, Geophysics, Lidar, Tidal Model, 13. Climate action, Space and Planetary Science, Analysis methods, 0103 physical sciences, Environmental science, Nighttime temperature evolution, 010303 astronomy & astrophysics, Stratosphere, 0105 earth and related environmental sciences |
| الوصف: | Systematic measurements of the middle-atmosphere temperature by a RAYLEIGH LIDAR located at La Reunion 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 8 h / 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. |
| تدمد: | 1364-6826 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a906c67ac31b36b8571c37b67dfa2ecc https://doi.org/10.1016/s1364-6826(02)00223-7 |
| حقوق: | CLOSED |
| رقم الأكسشن: | edsair.doi.dedup.....a906c67ac31b36b8571c37b67dfa2ecc |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 13646826 |
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